Merge tag 'iio-for-4.7a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

First round of IIO new device support, features and cleanups for the 4.7 cycle.

New core support
* UV light modifier (for intensity)
* UV light index channel type.

New device support
* hp206c barometer and altimeter
  - new driver.
* mcp4131 potentiometer
  - new driver supporting lots of parts from Microchip.
* mma8452
  - FXLS8471Q support
- NXP LPC18XX SOC ADC
  - new driver.
- NXP LPC18XX SOC DAC
  - new driver.
- rockchip_saradc
  - support rk3399
* st accel
  - h3lis331dl support

Staging driver removals
* adis16204
  - obsolete part making it hard to get parts to test the driver in order
    to clean it up.
* adis16220
  - obsolete part making it hard to get the parts test the driver in order
    to clean it up.

Features
* core
  - convenience functions to claim / release direct access to the device.
    Makes more consistent handling of this corner easier. Used in ad7192 driver.
* ak8975
  - power regulator support.
* at91-sama5d2
  - differential channel support.
* mma8452
  - runtime pm support
  - drop device specific autosleep and use the runtime pm one instead.
* ms5611
  - DT bindings
  - oversampling ratio support

Cleanups and minor fixes
* MAINTAINERS
  - Peter got married - hence name change!

* Documentation
  - Fix a typo in in_proximity_raw description.
  - Add some missing docs for iio_buffer_access_funcs.

* Tools
  - update iio_event_monitor names to match new stuff.
  - make generic_buffer look for triggers ending in -trigger as we let these in
  for a number of drivers a long time back and now it is a fairly common
  option.

Drivers
* staging wide
  - convert bare unsigned usage to unsigned int to comply with coding style.
* non staging wide:
  - since boiler plate gpio handling of interrupts has been moved into the
   ACPI core we don't need to include gpio/consumer.h in a load of drivers so
   drop it.
* ad7606
  - fix an endian casting sparse warning.
* ak8975
  - fix a possible unitialized warning from gcc.
  - drop and unused field left over from earlier cleanups
  - fix a missing regulator_disable on exit.
* at91-sama5d2
  - typo and indentation
  - missing IOMEM dependency.
  - cleanup mode register usage by avoidling erasing whole thing when changing
  the sampling frequency.
* bmc150
  - use the core demux and available_scan_masks to simplify buffer handling
  - optimize the transfers in the trigger handler now we have a magic function
  to emulate bulk reads (under circumstances met here).  This matters with some
  rather dumb i2c adapters in particular.
  - use a single regmap_conf for all bus types as they were all the same.
* bmg160
  - use the core demux and available_scan_masks to simplify the buffer handling
  - optimize the transfers in the trigger handler now we have a magic funciton
  to emulate bulk rads (under circumstances met here).
  - drop gpio interrupt probing from the driver (ACPI) as now handled by the
  ACPI core.
* ina2xx-adc
  - update the CALIB register when RShunt changes.
  - fix scale for VShunt - in reality this error canceled out when used.
* isl29028
  - use regmap to retrieve the struct device instead of carrying a second
  copy of it around.
* kxcjk-1013
  - use core demux
  - optimize i2c transfers in the trigger handler.
* mcp4531
  - refactor to use a pointer to access model parameters instead of indexing
    into the array each time.
* mma8452
  - style fixes
  - avoid swtiching to active whenever the config changes
  - add missin i2c_device_id for mma8451
* mpu6050
  - fix possible NULL dereference.
  - fix the name / chip_id used when ACPI used (otherwise reports as NULL).
* ms5611
  - fix a missing regulator_disable that left the regulator on during removal.
* mxc4005
  - drop gpio interrupt handling for ACPI case from driver as the core now
  handles this case.
* st-sensors
  - note that there are only ever a maximum of 3 axis on current st-sensors
  so just allocate a fixed sized buffer big enough for that.
* tpl0102
  - change the i2c_check_functionality condition to bring it inline with other
    IIO users as EOPNOTSUPP.
* tsl2563
  - replace deprecated flush_scheduled_work

45 files changed, 2185 insertions, 256 deletions

diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index b0d3ecf..e4a758c 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -64,7 +64,7 @@ config IIO_ST_ACCEL_3AXIS
 	help
 	  Say yes here to build support for STMicroelectronics accelerometers:
 	  LSM303DLH, LSM303DLHC, LIS3DH, LSM330D, LSM330DL, LSM330DLC,
-	  LIS331DLH, LSM303DL, LSM303DLM, LSM330, LIS2DH12.
+	  LIS331DLH, LSM303DL, LSM303DLM, LSM330, LIS2DH12, H3LIS331DL.
 
 	  This driver can also be built as a module. If so, these modules
 	  will be created:
@@ -143,7 +143,8 @@ config MMA8452
 	select IIO_TRIGGERED_BUFFER
 	help
 	  Say yes here to build support for the following Freescale 3-axis
-	  accelerometers: MMA8451Q, MMA8452Q, MMA8453Q, MMA8652FC, MMA8653FC.
+	  accelerometers: MMA8451Q, MMA8452Q, MMA8453Q, MMA8652FC, MMA8653FC,
+	  FXLS8471Q.
 
 	  To compile this driver as a module, choose M here: the module
 	  will be called mma8452.
diff --git a/drivers/iio/accel/bmc150-accel-core.c b/drivers/iio/accel/bmc150-accel-core.c
index c73331f7..e631ee9 100644
--- a/drivers/iio/accel/bmc150-accel-core.c
+++ b/drivers/iio/accel/bmc150-accel-core.c
@@ -25,7 +25,6 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
-#include <linux/gpio/consumer.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/iio/iio.h>
@@ -138,6 +137,7 @@ enum bmc150_accel_axis {
 	AXIS_X,
 	AXIS_Y,
 	AXIS_Z,
+	AXIS_MAX,
 };
 
 enum bmc150_power_modes {
@@ -246,11 +246,12 @@ static const struct {
 				       {500000, BMC150_ACCEL_SLEEP_500_MS},
 				       {1000000, BMC150_ACCEL_SLEEP_1_SEC} };
 
-static const struct regmap_config bmc150_i2c_regmap_conf = {
+const struct regmap_config bmc150_regmap_conf = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = 0x3f,
 };
+EXPORT_SYMBOL_GPL(bmc150_regmap_conf);
 
 static int bmc150_accel_set_mode(struct bmc150_accel_data *data,
 				 enum bmc150_power_modes mode,
@@ -988,6 +989,7 @@ static const struct iio_event_spec bmc150_accel_event = {
 		.realbits = (bits),					\
 		.storagebits = 16,					\
 		.shift = 16 - (bits),					\
+		.endianness = IIO_LE,					\
 	},								\
 	.event_spec = &bmc150_accel_event,				\
 	.num_event_specs = 1						\
@@ -1104,27 +1106,23 @@ static const struct iio_info bmc150_accel_info_fifo = {
 	.driver_module		= THIS_MODULE,
 };
 
+static const unsigned long bmc150_accel_scan_masks[] = {
+					BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z),
+					0};
+
 static irqreturn_t bmc150_accel_trigger_handler(int irq, void *p)
 {
 	struct iio_poll_func *pf = p;
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct bmc150_accel_data *data = iio_priv(indio_dev);
-	int bit, ret, i = 0;
-	unsigned int raw_val;
+	int ret;
 
 	mutex_lock(&data->mutex);
-	for_each_set_bit(bit, indio_dev->active_scan_mask,
-			 indio_dev->masklength) {
-		ret = regmap_bulk_read(data->regmap,
-				       BMC150_ACCEL_AXIS_TO_REG(bit), &raw_val,
-				       2);
-		if (ret < 0) {
-			mutex_unlock(&data->mutex);
-			goto err_read;
-		}
-		data->buffer[i++] = raw_val;
-	}
+	ret = regmap_bulk_read(data->regmap, BMC150_ACCEL_REG_XOUT_L,
+			       data->buffer, AXIS_MAX * 2);
 	mutex_unlock(&data->mutex);
+	if (ret < 0)
+		goto err_read;
 
 	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 					   pf->timestamp);
@@ -1574,6 +1572,7 @@ int bmc150_accel_core_probe(struct device *dev, struct regmap *regmap, int irq,
 	indio_dev->channels = data->chip_info->channels;
 	indio_dev->num_channels = data->chip_info->num_channels;
 	indio_dev->name = name ? name : data->chip_info->name;
+	indio_dev->available_scan_masks = bmc150_accel_scan_masks;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &bmc150_accel_info;
 
diff --git a/drivers/iio/accel/bmc150-accel-i2c.c b/drivers/iio/accel/bmc150-accel-i2c.c
index b41404b..8ca8041 100644
--- a/drivers/iio/accel/bmc150-accel-i2c.c
+++ b/drivers/iio/accel/bmc150-accel-i2c.c
@@ -28,11 +28,6 @@
 
 #include "bmc150-accel.h"
 
-static const struct regmap_config bmc150_i2c_regmap_conf = {
-	.reg_bits = 8,
-	.val_bits = 8,
-};
-
 static int bmc150_accel_probe(struct i2c_client *client,
 			      const struct i2c_device_id *id)
 {
@@ -43,7 +38,7 @@ static int bmc150_accel_probe(struct i2c_client *client,
 		i2c_check_functionality(client->adapter,
 					I2C_FUNC_SMBUS_READ_I2C_BLOCK);
 
-	regmap = devm_regmap_init_i2c(client, &bmc150_i2c_regmap_conf);
+	regmap = devm_regmap_init_i2c(client, &bmc150_regmap_conf);
 	if (IS_ERR(regmap)) {
 		dev_err(&client->dev, "Failed to initialize i2c regmap\n");
 		return PTR_ERR(regmap);
diff --git a/drivers/iio/accel/bmc150-accel-spi.c b/drivers/iio/accel/bmc150-accel-spi.c
index 16b66f2..006794a7 100644
--- a/drivers/iio/accel/bmc150-accel-spi.c
+++ b/drivers/iio/accel/bmc150-accel-spi.c
@@ -25,18 +25,12 @@
 
 #include "bmc150-accel.h"
 
-static const struct regmap_config bmc150_spi_regmap_conf = {
-	.reg_bits = 8,
-	.val_bits = 8,
-	.max_register = 0x3f,
-};
-
 static int bmc150_accel_probe(struct spi_device *spi)
 {
 	struct regmap *regmap;
 	const struct spi_device_id *id = spi_get_device_id(spi);
 
-	regmap = devm_regmap_init_spi(spi, &bmc150_spi_regmap_conf);
+	regmap = devm_regmap_init_spi(spi, &bmc150_regmap_conf);
 	if (IS_ERR(regmap)) {
 		dev_err(&spi->dev, "Failed to initialize spi regmap\n");
 		return PTR_ERR(regmap);
diff --git a/drivers/iio/accel/bmc150-accel.h b/drivers/iio/accel/bmc150-accel.h
index ba03359..38a8b11 100644
--- a/drivers/iio/accel/bmc150-accel.h
+++ b/drivers/iio/accel/bmc150-accel.h
@@ -16,5 +16,6 @@ int bmc150_accel_core_probe(struct device *dev, struct regmap *regmap, int irq,
 			    const char *name, bool block_supported);
 int bmc150_accel_core_remove(struct device *dev);
 extern const struct dev_pm_ops bmc150_accel_pm_ops;
+extern const struct regmap_config bmc150_regmap_conf;
 
 #endif  /* _BMC150_ACCEL_H_ */
diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
index edec1d0..bfe219a 100644
--- a/drivers/iio/accel/kxcjk-1013.c
+++ b/drivers/iio/accel/kxcjk-1013.c
@@ -20,7 +20,6 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/acpi.h>
-#include <linux/gpio/consumer.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/iio/iio.h>
@@ -115,6 +114,7 @@ enum kxcjk1013_axis {
 	AXIS_X,
 	AXIS_Y,
 	AXIS_Z,
+	AXIS_MAX,
 };
 
 enum kxcjk1013_mode {
@@ -922,7 +922,7 @@ static const struct iio_event_spec kxcjk1013_event = {
 		.realbits = 12,						\
 		.storagebits = 16,					\
 		.shift = 4,						\
-		.endianness = IIO_CPU,					\
+		.endianness = IIO_LE,					\
 	},								\
 	.event_spec = &kxcjk1013_event,				\
 	.num_event_specs = 1						\
@@ -953,25 +953,23 @@ static const struct iio_info kxcjk1013_info = {
 	.driver_module		= THIS_MODULE,
 };
 
+static const unsigned long kxcjk1013_scan_masks[] = {0x7, 0};
+
 static irqreturn_t kxcjk1013_trigger_handler(int irq, void *p)
 {
 	struct iio_poll_func *pf = p;
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct kxcjk1013_data *data = iio_priv(indio_dev);
-	int bit, ret, i = 0;
+	int ret;
 
 	mutex_lock(&data->mutex);
-
-	for_each_set_bit(bit, indio_dev->active_scan_mask,
-			 indio_dev->masklength) {
-		ret = kxcjk1013_get_acc_reg(data, bit);
-		if (ret < 0) {
-			mutex_unlock(&data->mutex);
-			goto err;
-		}
-		data->buffer[i++] = ret;
-	}
+	ret = i2c_smbus_read_i2c_block_data_or_emulated(data->client,
+							KXCJK1013_REG_XOUT_L,
+							AXIS_MAX * 2,
+							(u8 *)data->buffer);
 	mutex_unlock(&data->mutex);
+	if (ret < 0)
+		goto err;
 
 	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 					   data->timestamp);
@@ -1204,6 +1202,7 @@ static int kxcjk1013_probe(struct i2c_client *client,
 	indio_dev->dev.parent = &client->dev;
 	indio_dev->channels = kxcjk1013_channels;
 	indio_dev->num_channels = ARRAY_SIZE(kxcjk1013_channels);
+	indio_dev->available_scan_masks = kxcjk1013_scan_masks;
 	indio_dev->name = name;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &kxcjk1013_info;
diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index 7f4994f..e225d3c 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -6,6 +6,7 @@
  * MMA8453Q (10 bit)
  * MMA8652FC (12 bit)
  * MMA8653FC (10 bit)
+ * FXLS8471Q (14 bit)
  *
  * Copyright 2015 Martin Kepplinger <martin.kepplinger@theobroma-systems.com>
  * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net>
@@ -16,7 +17,7 @@
  *
  * 7-bit I2C slave address 0x1c/0x1d (pin selectable)
  *
- * TODO: orientation events, autosleep
+ * TODO: orientation events
  */
 
 #include <linux/module.h>
@@ -31,6 +32,7 @@
 #include <linux/delay.h>
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
+#include <linux/pm_runtime.h>
 
 #define MMA8452_STATUS				0x00
 #define  MMA8452_STATUS_DRDY			(BIT(2) | BIT(1) | BIT(0))
@@ -91,6 +93,9 @@
 #define MMA8453_DEVICE_ID			0x3a
 #define MMA8652_DEVICE_ID			0x4a
 #define MMA8653_DEVICE_ID			0x5a
+#define FXLS8471_DEVICE_ID			0x6a
+
+#define MMA8452_AUTO_SUSPEND_DELAY_MS		2000
 
 struct mma8452_data {
 	struct i2c_client *client;
@@ -172,6 +177,31 @@ static int mma8452_drdy(struct mma8452_data *data)
 	return -EIO;
 }
 
+static int mma8452_set_runtime_pm_state(struct i2c_client *client, bool on)
+{
+#ifdef CONFIG_PM
+	int ret;
+
+	if (on) {
+		ret = pm_runtime_get_sync(&client->dev);
+	} else {
+		pm_runtime_mark_last_busy(&client->dev);
+		ret = pm_runtime_put_autosuspend(&client->dev);
+	}
+
+	if (ret < 0) {
+		dev_err(&client->dev,
+			"failed to change power state to %d\n", on);
+		if (on)
+			pm_runtime_put_noidle(&client->dev);
+
+		return ret;
+	}
+#endif
+
+	return 0;
+}
+
 static int mma8452_read(struct mma8452_data *data, __be16 buf[3])
 {
 	int ret = mma8452_drdy(data);
@@ -179,8 +209,16 @@ static int mma8452_read(struct mma8452_data *data, __be16 buf[3])
 	if (ret < 0)
 		return ret;
 
-	return i2c_smbus_read_i2c_block_data(data->client, MMA8452_OUT_X,
-					     3 * sizeof(__be16), (u8 *)buf);
+	ret = mma8452_set_runtime_pm_state(data->client, true);
+	if (ret)
+		return ret;
+
+	ret = i2c_smbus_read_i2c_block_data(data->client, MMA8452_OUT_X,
+					    3 * sizeof(__be16), (u8 *)buf);
+
+	ret = mma8452_set_runtime_pm_state(data->client, false);
+
+	return ret;
 }
 
 static ssize_t mma8452_show_int_plus_micros(char *buf, const int (*vals)[2],
@@ -357,7 +395,8 @@ static int mma8452_read_raw(struct iio_dev *indio_dev,
 		return IIO_VAL_INT_PLUS_MICRO;
 	case IIO_CHAN_INFO_CALIBBIAS:
 		ret = i2c_smbus_read_byte_data(data->client,
-					      MMA8452_OFF_X + chan->scan_index);
+					       MMA8452_OFF_X +
+					       chan->scan_index);
 		if (ret < 0)
 			return ret;
 
@@ -392,24 +431,47 @@ static int mma8452_active(struct mma8452_data *data)
 					 data->ctrl_reg1);
 }
 
+/* returns >0 if active, 0 if in standby and <0 on error */
+static int mma8452_is_active(struct mma8452_data *data)
+{
+	int reg;
+
+	reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG1);
+	if (reg < 0)
+		return reg;
+
+	return reg & MMA8452_CTRL_ACTIVE;
+}
+
 static int mma8452_change_config(struct mma8452_data *data, u8 reg, u8 val)
 {
 	int ret;
+	int is_active;
 
 	mutex_lock(&data->lock);
 
-	/* config can only be changed when in standby */
-	ret = mma8452_standby(data);
-	if (ret < 0)
+	is_active = mma8452_is_active(data);
+	if (is_active < 0) {
+		ret = is_active;
 		goto fail;
+	}
+
+	/* config can only be changed when in standby */
+	if (is_active > 0) {
+		ret = mma8452_standby(data);
+		if (ret < 0)
+			goto fail;
+	}
 
 	ret = i2c_smbus_write_byte_data(data->client, reg, val);
 	if (ret < 0)
 		goto fail;
 
-	ret = mma8452_active(data);
-	if (ret < 0)
-		goto fail;
+	if (is_active > 0) {
+		ret = mma8452_active(data);
+		if (ret < 0)
+			goto fail;
+	}
 
 	ret = 0;
 fail:
@@ -418,7 +480,7 @@ fail:
 	return ret;
 }
 
-/* returns >0 if in freefall mode, 0 if not or <0 if an error occured */
+/* returns >0 if in freefall mode, 0 if not or <0 if an error occurred */
 static int mma8452_freefall_mode_enabled(struct mma8452_data *data)
 {
 	int val;
@@ -668,7 +730,8 @@ static int mma8452_read_event_config(struct iio_dev *indio_dev,
 		if (ret < 0)
 			return ret;
 
-		return !!(ret & BIT(chan->scan_index + chip->ev_cfg_chan_shift));
+		return !!(ret & BIT(chan->scan_index +
+				    chip->ev_cfg_chan_shift));
 	default:
 		return -EINVAL;
 	}
@@ -682,7 +745,11 @@ static int mma8452_write_event_config(struct iio_dev *indio_dev,
 {
 	struct mma8452_data *data = iio_priv(indio_dev);
 	const struct mma_chip_info *chip = data->chip_info;
-	int val;
+	int val, ret;
+
+	ret = mma8452_set_runtime_pm_state(data->client, state);
+	if (ret)
+		return ret;
 
 	switch (dir) {
 	case IIO_EV_DIR_FALLING:
@@ -990,6 +1057,7 @@ enum {
 	mma8453,
 	mma8652,
 	mma8653,
+	fxls8471,
 };
 
 static const struct mma_chip_info mma_chip_info_table[] = {
@@ -1003,7 +1071,7 @@ static const struct mma_chip_info mma_chip_info_table[] = {
 		 * bit.
 		 * The userspace interface uses m/s^2 and we declare micro units
 		 * So scale factor for 12 bit here is given by:
-		 * 	g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665
+		 *	g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665
 		 */
 		.mma_scales = { {0, 2394}, {0, 4788}, {0, 9577} },
 		.ev_cfg = MMA8452_TRANSIENT_CFG,
@@ -1081,6 +1149,22 @@ static const struct mma_chip_info mma_chip_info_table[] = {
 		.ev_ths_mask = MMA8452_FF_MT_THS_MASK,
 		.ev_count = MMA8452_FF_MT_COUNT,
 	},
+	[fxls8471] = {
+		.chip_id = FXLS8471_DEVICE_ID,
+		.channels = mma8451_channels,
+		.num_channels = ARRAY_SIZE(mma8451_channels),
+		.mma_scales = { {0, 2394}, {0, 4788}, {0, 9577} },
+		.ev_cfg = MMA8452_TRANSIENT_CFG,
+		.ev_cfg_ele = MMA8452_TRANSIENT_CFG_ELE,
+		.ev_cfg_chan_shift = 1,
+		.ev_src = MMA8452_TRANSIENT_SRC,
+		.ev_src_xe = MMA8452_TRANSIENT_SRC_XTRANSE,
+		.ev_src_ye = MMA8452_TRANSIENT_SRC_YTRANSE,
+		.ev_src_ze = MMA8452_TRANSIENT_SRC_ZTRANSE,
+		.ev_ths = MMA8452_TRANSIENT_THS,
+		.ev_ths_mask = MMA8452_TRANSIENT_THS_MASK,
+		.ev_count = MMA8452_TRANSIENT_COUNT,
+	},
 };
 
 static struct attribute *mma8452_attributes[] = {
@@ -1114,7 +1198,11 @@ static int mma8452_data_rdy_trigger_set_state(struct iio_trigger *trig,
 {
 	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 	struct mma8452_data *data = iio_priv(indio_dev);
-	int reg;
+	int reg, ret;
+
+	ret = mma8452_set_runtime_pm_state(data->client, state);
+	if (ret)
+		return ret;
 
 	reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG4);
 	if (reg < 0)
@@ -1206,6 +1294,7 @@ static const struct of_device_id mma8452_dt_ids[] = {
 	{ .compatible = "fsl,mma8453", .data = &mma_chip_info_table[mma8453] },
 	{ .compatible = "fsl,mma8652", .data = &mma_chip_info_table[mma8652] },
 	{ .compatible = "fsl,mma8653", .data = &mma_chip_info_table[mma8653] },
+	{ .compatible = "fsl,fxls8471", .data = &mma_chip_info_table[fxls8471] },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, mma8452_dt_ids);
@@ -1243,6 +1332,7 @@ static int mma8452_probe(struct i2c_client *client,
 	case MMA8453_DEVICE_ID:
 	case MMA8652_DEVICE_ID:
 	case MMA8653_DEVICE_ID:
+	case FXLS8471_DEVICE_ID:
 		if (ret == data->chip_info->chip_id)
 			break;
 	default:
@@ -1340,6 +1430,15 @@ static int mma8452_probe(struct i2c_client *client,
 			goto buffer_cleanup;
 	}
 
+	ret = pm_runtime_set_active(&client->dev);
+	if (ret < 0)
+		goto buffer_cleanup;
+
+	pm_runtime_enable(&client->dev);
+	pm_runtime_set_autosuspend_delay(&client->dev,
+					 MMA8452_AUTO_SUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(&client->dev);
+
 	ret = iio_device_register(indio_dev);
 	if (ret < 0)
 		goto buffer_cleanup;
@@ -1364,6 +1463,11 @@ static int mma8452_remove(struct i2c_client *client)
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
 
 	iio_device_unregister(indio_dev);
+
+	pm_runtime_disable(&client->dev);
+	pm_runtime_set_suspended(&client->dev);
+	pm_runtime_put_noidle(&client->dev);
+
 	iio_triggered_buffer_cleanup(indio_dev);
 	mma8452_trigger_cleanup(indio_dev);
 	mma8452_standby(iio_priv(indio_dev));
@@ -1371,6 +1475,45 @@ static int mma8452_remove(struct i2c_client *client)
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static int mma8452_runtime_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mma8452_data *data = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&data->lock);
+	ret = mma8452_standby(data);
+	mutex_unlock(&data->lock);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "powering off device failed\n");
+		return -EAGAIN;
+	}
+
+	return 0;
+}
+
+static int mma8452_runtime_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mma8452_data *data = iio_priv(indio_dev);
+	int ret, sleep_val;
+
+	ret = mma8452_active(data);
+	if (ret < 0)
+		return ret;
+
+	ret = mma8452_get_odr_index(data);
+	sleep_val = 1000 / mma8452_samp_freq[ret][0];
+	if (sleep_val < 20)
+		usleep_range(sleep_val * 1000, 20000);
+	else
+		msleep_interruptible(sleep_val);
+
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_PM_SLEEP
 static int mma8452_suspend(struct device *dev)
 {
@@ -1383,18 +1526,21 @@ static int mma8452_resume(struct device *dev)
 	return mma8452_active(iio_priv(i2c_get_clientdata(
 		to_i2c_client(dev))));
 }
-
-static SIMPLE_DEV_PM_OPS(mma8452_pm_ops, mma8452_suspend, mma8452_resume);
-#define MMA8452_PM_OPS (&mma8452_pm_ops)
-#else
-#define MMA8452_PM_OPS NULL
 #endif
 
+static const struct dev_pm_ops mma8452_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mma8452_suspend, mma8452_resume)
+	SET_RUNTIME_PM_OPS(mma8452_runtime_suspend,
+			   mma8452_runtime_resume, NULL)
+};
+
 static const struct i2c_device_id mma8452_id[] = {
+	{ "mma8451", mma8451 },
 	{ "mma8452", mma8452 },
 	{ "mma8453", mma8453 },
 	{ "mma8652", mma8652 },
 	{ "mma8653", mma8653 },
+	{ "fxls8471", fxls8471 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, mma8452_id);
@@ -1403,7 +1549,7 @@ static struct i2c_driver mma8452_driver = {
 	.driver = {
 		.name	= "mma8452",
 		.of_match_table = of_match_ptr(mma8452_dt_ids),
-		.pm	= MMA8452_PM_OPS,
+		.pm	= &mma8452_pm_ops,
 	},
 	.probe = mma8452_probe,
 	.remove = mma8452_remove,
diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c
index fa7d362..bb05f3e 100644
--- a/drivers/iio/accel/mma9553.c
+++ b/drivers/iio/accel/mma9553.c
@@ -17,7 +17,6 @@
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
-#include <linux/gpio/consumer.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/events.h>
diff --git a/drivers/iio/accel/mxc4005.c b/drivers/iio/accel/mxc4005.c
index e72e218..c23f47a 100644
--- a/drivers/iio/accel/mxc4005.c
+++ b/drivers/iio/accel/mxc4005.c
@@ -17,7 +17,6 @@
 #include <linux/i2c.h>
 #include <linux/iio/iio.h>
 #include <linux/acpi.h>
-#include <linux/gpio/consumer.h>
 #include <linux/regmap.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/trigger.h>
@@ -380,31 +379,6 @@ static const struct iio_trigger_ops mxc4005_trigger_ops = {
 	.owner = THIS_MODULE,
 };
 
-static int mxc4005_gpio_probe(struct i2c_client *client,
-			      struct mxc4005_data *data)
-{
-	struct device *dev;
-	struct gpio_desc *gpio;
-	int ret;
-
-	if (!client)
-		return -EINVAL;
-
-	dev = &client->dev;
-
-	gpio = devm_gpiod_get_index(dev, "mxc4005_int", 0, GPIOD_IN);
-	if (IS_ERR(gpio)) {
-		dev_err(dev, "failed to get acpi gpio index\n");
-		return PTR_ERR(gpio);
-	}
-
-	ret = gpiod_to_irq(gpio);
-
-	dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
-
-	return ret;
-}
-
 static int mxc4005_chip_init(struct mxc4005_data *data)
 {
 	int ret;
@@ -470,9 +444,6 @@ static int mxc4005_probe(struct i2c_client *client,
 		return ret;
 	}
 
-	if (client->irq < 0)
-		client->irq = mxc4005_gpio_probe(client, data);
-
 	if (client->irq > 0) {
 		data->dready_trig = devm_iio_trigger_alloc(&client->dev,
 							   "%s-dev%d",
diff --git a/drivers/iio/accel/st_accel.h b/drivers/iio/accel/st_accel.h
index 5d4a189..57f83a6 100644
--- a/drivers/iio/accel/st_accel.h
+++ b/drivers/iio/accel/st_accel.h
@@ -14,6 +14,7 @@
 #include <linux/types.h>
 #include <linux/iio/common/st_sensors.h>
 
+#define H3LIS331DL_DRIVER_NAME		"h3lis331dl_accel"
 #define LIS3LV02DL_ACCEL_DEV_NAME	"lis3lv02dl_accel"
 #define LSM303DLHC_ACCEL_DEV_NAME	"lsm303dlhc_accel"
 #define LIS3DH_ACCEL_DEV_NAME		"lis3dh"
diff --git a/drivers/iio/accel/st_accel_core.c b/drivers/iio/accel/st_accel_core.c
index a03a141..fee32e3 100644
--- a/drivers/iio/accel/st_accel_core.c
+++ b/drivers/iio/accel/st_accel_core.c
@@ -39,6 +39,9 @@
 #define ST_ACCEL_FS_AVL_6G			6
 #define ST_ACCEL_FS_AVL_8G			8
 #define ST_ACCEL_FS_AVL_16G			16
+#define ST_ACCEL_FS_AVL_100G			100
+#define ST_ACCEL_FS_AVL_200G			200
+#define ST_ACCEL_FS_AVL_400G			400
 
 /* CUSTOM VALUES FOR SENSOR 1 */
 #define ST_ACCEL_1_WAI_EXP			0x33
@@ -181,6 +184,33 @@
 #define ST_ACCEL_5_IG1_EN_MASK			0x08
 #define ST_ACCEL_5_MULTIREAD_BIT		false
 
+/* CUSTOM VALUES FOR SENSOR 6 */
+#define ST_ACCEL_6_WAI_EXP			0x32
+#define ST_ACCEL_6_ODR_ADDR			0x20
+#define ST_ACCEL_6_ODR_MASK			0x18
+#define ST_ACCEL_6_ODR_AVL_50HZ_VAL		0x00
+#define ST_ACCEL_6_ODR_AVL_100HZ_VAL		0x01
+#define ST_ACCEL_6_ODR_AVL_400HZ_VAL		0x02
+#define ST_ACCEL_6_ODR_AVL_1000HZ_VAL		0x03
+#define ST_ACCEL_6_PW_ADDR			0x20
+#define ST_ACCEL_6_PW_MASK			0x20
+#define ST_ACCEL_6_FS_ADDR			0x23
+#define ST_ACCEL_6_FS_MASK			0x30
+#define ST_ACCEL_6_FS_AVL_100_VAL		0x00
+#define ST_ACCEL_6_FS_AVL_200_VAL		0x01
+#define ST_ACCEL_6_FS_AVL_400_VAL		0x03
+#define ST_ACCEL_6_FS_AVL_100_GAIN		IIO_G_TO_M_S_2(49000)
+#define ST_ACCEL_6_FS_AVL_200_GAIN		IIO_G_TO_M_S_2(98000)
+#define ST_ACCEL_6_FS_AVL_400_GAIN		IIO_G_TO_M_S_2(195000)
+#define ST_ACCEL_6_BDU_ADDR			0x23
+#define ST_ACCEL_6_BDU_MASK			0x80
+#define ST_ACCEL_6_DRDY_IRQ_ADDR		0x22
+#define ST_ACCEL_6_DRDY_IRQ_INT1_MASK		0x02
+#define ST_ACCEL_6_DRDY_IRQ_INT2_MASK		0x10
+#define ST_ACCEL_6_IHL_IRQ_ADDR			0x22
+#define ST_ACCEL_6_IHL_IRQ_MASK			0x80
+#define ST_ACCEL_6_MULTIREAD_BIT		true
+
 static const struct iio_chan_spec st_accel_8bit_channels[] = {
 	ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,
 			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
@@ -557,6 +587,68 @@ static const struct st_sensor_settings st_accel_sensors_settings[] = {
 		.multi_read_bit = ST_ACCEL_5_MULTIREAD_BIT,
 		.bootime = 2, /* guess */
 	},
+	{
+		.wai = ST_ACCEL_6_WAI_EXP,
+		.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
+		.sensors_supported = {
+			[0] = H3LIS331DL_DRIVER_NAME,
+		},
+		.ch = (struct iio_chan_spec *)st_accel_12bit_channels,
+		.odr = {
+			.addr = ST_ACCEL_6_ODR_ADDR,
+			.mask = ST_ACCEL_6_ODR_MASK,
+			.odr_avl = {
+				{ 50, ST_ACCEL_6_ODR_AVL_50HZ_VAL },
+				{ 100, ST_ACCEL_6_ODR_AVL_100HZ_VAL, },
+				{ 400, ST_ACCEL_6_ODR_AVL_400HZ_VAL, },
+				{ 1000, ST_ACCEL_6_ODR_AVL_1000HZ_VAL, },
+			},
+		},
+		.pw = {
+			.addr = ST_ACCEL_6_PW_ADDR,
+			.mask = ST_ACCEL_6_PW_MASK,
+			.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
+			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
+		},
+		.enable_axis = {
+			.addr = ST_SENSORS_DEFAULT_AXIS_ADDR,
+			.mask = ST_SENSORS_DEFAULT_AXIS_MASK,
+		},
+		.fs = {
+			.addr = ST_ACCEL_6_FS_ADDR,
+			.mask = ST_ACCEL_6_FS_MASK,
+			.fs_avl = {
+				[0] = {
+					.num = ST_ACCEL_FS_AVL_100G,
+					.value = ST_ACCEL_6_FS_AVL_100_VAL,
+					.gain = ST_ACCEL_6_FS_AVL_100_GAIN,
+				},
+				[1] = {
+					.num = ST_ACCEL_FS_AVL_200G,
+					.value = ST_ACCEL_6_FS_AVL_200_VAL,
+					.gain = ST_ACCEL_6_FS_AVL_200_GAIN,
+				},
+				[2] = {
+					.num = ST_ACCEL_FS_AVL_400G,
+					.value = ST_ACCEL_6_FS_AVL_400_VAL,
+					.gain = ST_ACCEL_6_FS_AVL_400_GAIN,
+				},
+			},
+		},
+		.bdu = {
+			.addr = ST_ACCEL_6_BDU_ADDR,
+			.mask = ST_ACCEL_6_BDU_MASK,
+		},
+		.drdy_irq = {
+			.addr = ST_ACCEL_6_DRDY_IRQ_ADDR,
+			.mask_int1 = ST_ACCEL_6_DRDY_IRQ_INT1_MASK,
+			.mask_int2 = ST_ACCEL_6_DRDY_IRQ_INT2_MASK,
+			.addr_ihl = ST_ACCEL_6_IHL_IRQ_ADDR,
+			.mask_ihl = ST_ACCEL_6_IHL_IRQ_MASK,
+		},
+		.multi_read_bit = ST_ACCEL_6_MULTIREAD_BIT,
+		.bootime = 2,
+	},
 };
 
 static int st_accel_read_raw(struct iio_dev *indio_dev,
diff --git a/drivers/iio/accel/st_accel_i2c.c b/drivers/iio/accel/st_accel_i2c.c
index 294a32f..7333ee9 100644
--- a/drivers/iio/accel/st_accel_i2c.c
+++ b/drivers/iio/accel/st_accel_i2c.c
@@ -76,6 +76,10 @@ static const struct of_device_id st_accel_of_match[] = {
 		.compatible = "st,lis2dh12-accel",
 		.data = LIS2DH12_ACCEL_DEV_NAME,
 	},
+	{
+		.compatible = "st,h3lis331dl-accel",
+		.data = H3LIS331DL_DRIVER_NAME,
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, st_accel_of_match);
diff --git a/drivers/iio/accel/stk8312.c b/drivers/iio/accel/stk8312.c
index 85fe7f7..e31023d 100644
--- a/drivers/iio/accel/stk8312.c
+++ b/drivers/iio/accel/stk8312.c
@@ -11,7 +11,6 @@
  */
 
 #include <linux/acpi.h>
-#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
diff --git a/drivers/iio/accel/stk8ba50.c b/drivers/iio/accel/stk8ba50.c
index 5709d9e..300d955 100644
--- a/drivers/iio/accel/stk8ba50.c
+++ b/drivers/iio/accel/stk8ba50.c
@@ -11,7 +11,6 @@
  */
 
 #include <linux/acpi.h>
-#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index af4aea7..5937030 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -134,6 +134,7 @@ config AT91_ADC
 config AT91_SAMA5D2_ADC
 	tristate "Atmel AT91 SAMA5D2 ADC"
 	depends on ARCH_AT91 || COMPILE_TEST
+	depends on HAS_IOMEM
 	help
 	  Say yes here to build support for Atmel SAMA5D2 ADC which is
 	  available on SAMA5D2 SoC family.
@@ -241,6 +242,16 @@ config LP8788_ADC
 	  To compile this driver as a module, choose M here: the module will be
 	  called lp8788_adc.
 
+config LPC18XX_ADC
+	tristate "NXP LPC18xx ADC driver"
+	depends on ARCH_LPC18XX || COMPILE_TEST
+	depends on OF && HAS_IOMEM
+	help
+	  Say yes here to build support for NXP LPC18XX ADC.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called lpc18xx_adc.
+
 config MAX1027
 	tristate "Maxim max1027 ADC driver"
 	depends on SPI
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 0cb7921..38638d4 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_HI8435) += hi8435.o
 obj-$(CONFIG_IMX7D_ADC) += imx7d_adc.o
 obj-$(CONFIG_INA2XX_ADC) += ina2xx-adc.o
 obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
+obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o
 obj-$(CONFIG_MAX1027) += max1027.o
 obj-$(CONFIG_MAX1363) += max1363.o
 obj-$(CONFIG_MCP320X) += mcp320x.o
diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index dbee13a..07adb10 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -66,8 +66,10 @@
 #define	AT91_SAMA5D2_MR_PRESCAL(v)	((v) << AT91_SAMA5D2_MR_PRESCAL_OFFSET)
 #define	AT91_SAMA5D2_MR_PRESCAL_OFFSET	8
 #define	AT91_SAMA5D2_MR_PRESCAL_MAX	0xff
+#define AT91_SAMA5D2_MR_PRESCAL_MASK	GENMASK(15, 8)
 /* Startup Time */
 #define	AT91_SAMA5D2_MR_STARTUP(v)	((v) << 16)
+#define AT91_SAMA5D2_MR_STARTUP_MASK	GENMASK(19, 16)
 /* Analog Change */
 #define	AT91_SAMA5D2_MR_ANACH		BIT(23)
 /* Tracking Time */
@@ -92,13 +94,13 @@
 /* Last Converted Data Register */
 #define AT91_SAMA5D2_LCDR	0x20
 /* Interrupt Enable Register */
-#define AT91_SAMA5D2_IER		0x24
+#define AT91_SAMA5D2_IER	0x24
 /* Interrupt Disable Register */
-#define AT91_SAMA5D2_IDR		0x28
+#define AT91_SAMA5D2_IDR	0x28
 /* Interrupt Mask Register */
-#define AT91_SAMA5D2_IMR		0x2c
+#define AT91_SAMA5D2_IMR	0x2c
 /* Interrupt Status Register */
-#define AT91_SAMA5D2_ISR		0x30
+#define AT91_SAMA5D2_ISR	0x30
 /* Last Channel Trigger Mode Register */
 #define AT91_SAMA5D2_LCTMR	0x34
 /* Last Channel Compare Window Register */
@@ -106,17 +108,20 @@
 /* Overrun Status Register */
 #define AT91_SAMA5D2_OVER	0x3c
 /* Extended Mode Register */
-#define AT91_SAMA5D2_EMR		0x40
+#define AT91_SAMA5D2_EMR	0x40
 /* Compare Window Register */
-#define AT91_SAMA5D2_CWR		0x44
+#define AT91_SAMA5D2_CWR	0x44
 /* Channel Gain Register */
-#define AT91_SAMA5D2_CGR		0x48
+#define AT91_SAMA5D2_CGR	0x48
+
 /* Channel Offset Register */
-#define AT91_SAMA5D2_COR		0x4c
+#define AT91_SAMA5D2_COR	0x4c
+#define AT91_SAMA5D2_COR_DIFF_OFFSET	16
+
 /* Channel Data Register 0 */
 #define AT91_SAMA5D2_CDR0	0x50
 /* Analog Control Register */
-#define AT91_SAMA5D2_ACR		0x94
+#define AT91_SAMA5D2_ACR	0x94
 /* Touchscreen Mode Register */
 #define AT91_SAMA5D2_TSMR	0xb0
 /* Touchscreen X Position Register */
@@ -130,7 +135,7 @@
 /* Correction Select Register */
 #define AT91_SAMA5D2_COSR	0xd0
 /* Correction Value Register */
-#define AT91_SAMA5D2_CVR		0xd4
+#define AT91_SAMA5D2_CVR	0xd4
 /* Channel Error Correction Register */
 #define AT91_SAMA5D2_CECR	0xd8
 /* Write Protection Mode Register */
@@ -140,7 +145,7 @@
 /* Version Register */
 #define AT91_SAMA5D2_VERSION	0xfc
 
-#define AT91_AT91_SAMA5D2_CHAN(num, addr)				\
+#define AT91_SAMA5D2_CHAN_SINGLE(num, addr)				\
 	{								\
 		.type = IIO_VOLTAGE,					\
 		.channel = num,						\
@@ -156,6 +161,24 @@
 		.indexed = 1,						\
 	}
 
+#define AT91_SAMA5D2_CHAN_DIFF(num, num2, addr)				\
+	{								\
+		.type = IIO_VOLTAGE,					\
+		.differential = 1,					\
+		.channel = num,						\
+		.channel2 = num2,					\
+		.address = addr,					\
+		.scan_type = {						\
+			.sign = 's',					\
+			.realbits = 12,					\
+		},							\
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
+		.datasheet_name = "CH"#num"-CH"#num2,			\
+		.indexed = 1,						\
+	}
+
 #define at91_adc_readl(st, reg)		readl_relaxed(st->base + reg)
 #define at91_adc_writel(st, reg, val)	writel_relaxed(val, st->base + reg)
 
@@ -185,18 +208,24 @@ struct at91_adc_state {
 };
 
 static const struct iio_chan_spec at91_adc_channels[] = {
-	AT91_AT91_SAMA5D2_CHAN(0, 0x50),
-	AT91_AT91_SAMA5D2_CHAN(1, 0x54),
-	AT91_AT91_SAMA5D2_CHAN(2, 0x58),
-	AT91_AT91_SAMA5D2_CHAN(3, 0x5c),
-	AT91_AT91_SAMA5D2_CHAN(4, 0x60),
-	AT91_AT91_SAMA5D2_CHAN(5, 0x64),
-	AT91_AT91_SAMA5D2_CHAN(6, 0x68),
-	AT91_AT91_SAMA5D2_CHAN(7, 0x6c),
-	AT91_AT91_SAMA5D2_CHAN(8, 0x70),
-	AT91_AT91_SAMA5D2_CHAN(9, 0x74),
-	AT91_AT91_SAMA5D2_CHAN(10, 0x78),
-	AT91_AT91_SAMA5D2_CHAN(11, 0x7c),
+	AT91_SAMA5D2_CHAN_SINGLE(0, 0x50),
+	AT91_SAMA5D2_CHAN_SINGLE(1, 0x54),
+	AT91_SAMA5D2_CHAN_SINGLE(2, 0x58),
+	AT91_SAMA5D2_CHAN_SINGLE(3, 0x5c),
+	AT91_SAMA5D2_CHAN_SINGLE(4, 0x60),
+	AT91_SAMA5D2_CHAN_SINGLE(5, 0x64),
+	AT91_SAMA5D2_CHAN_SINGLE(6, 0x68),
+	AT91_SAMA5D2_CHAN_SINGLE(7, 0x6c),
+	AT91_SAMA5D2_CHAN_SINGLE(8, 0x70),
+	AT91_SAMA5D2_CHAN_SINGLE(9, 0x74),
+	AT91_SAMA5D2_CHAN_SINGLE(10, 0x78),
+	AT91_SAMA5D2_CHAN_SINGLE(11, 0x7c),
+	AT91_SAMA5D2_CHAN_DIFF(0, 1, 0x50),
+	AT91_SAMA5D2_CHAN_DIFF(2, 3, 0x58),
+	AT91_SAMA5D2_CHAN_DIFF(4, 5, 0x60),
+	AT91_SAMA5D2_CHAN_DIFF(6, 7, 0x68),
+	AT91_SAMA5D2_CHAN_DIFF(8, 9, 0x70),
+	AT91_SAMA5D2_CHAN_DIFF(10, 11, 0x78),
 };
 
 static unsigned at91_adc_startup_time(unsigned startup_time_min,
@@ -226,7 +255,7 @@ static unsigned at91_adc_startup_time(unsigned startup_time_min,
 static void at91_adc_setup_samp_freq(struct at91_adc_state *st, unsigned freq)
 {
 	struct iio_dev *indio_dev = iio_priv_to_dev(st);
-	unsigned f_per, prescal, startup;
+	unsigned f_per, prescal, startup, mr;
 
 	f_per = clk_get_rate(st->per_clk);
 	prescal = (f_per / (2 * freq)) - 1;
@@ -234,10 +263,11 @@ static void at91_adc_setup_samp_freq(struct at91_adc_state *st, unsigned freq)
 	startup = at91_adc_startup_time(st->soc_info.startup_time,
 					freq / 1000);
 
-	at91_adc_writel(st, AT91_SAMA5D2_MR,
-			AT91_SAMA5D2_MR_TRANSFER(2)
-			| AT91_SAMA5D2_MR_STARTUP(startup)
-			| AT91_SAMA5D2_MR_PRESCAL(prescal));
+	mr = at91_adc_readl(st, AT91_SAMA5D2_MR);
+	mr &= ~(AT91_SAMA5D2_MR_STARTUP_MASK | AT91_SAMA5D2_MR_PRESCAL_MASK);
+	mr |= AT91_SAMA5D2_MR_STARTUP(startup);
+	mr |= AT91_SAMA5D2_MR_PRESCAL(prescal);
+	at91_adc_writel(st, AT91_SAMA5D2_MR, mr);
 
 	dev_dbg(&indio_dev->dev, "freq: %u, startup: %u, prescal: %u\n",
 		freq, startup, prescal);
@@ -278,6 +308,7 @@ static int at91_adc_read_raw(struct iio_dev *indio_dev,
 			     int *val, int *val2, long mask)
 {
 	struct at91_adc_state *st = iio_priv(indio_dev);
+	u32 cor = 0;
 	int ret;
 
 	switch (mask) {
@@ -286,6 +317,11 @@ static int at91_adc_read_raw(struct iio_dev *indio_dev,
 
 		st->chan = chan;
 
+		if (chan->differential)
+			cor = (BIT(chan->channel) | BIT(chan->channel2)) <<
+			      AT91_SAMA5D2_COR_DIFF_OFFSET;
+
+		at91_adc_writel(st, AT91_SAMA5D2_COR, cor);
 		at91_adc_writel(st, AT91_SAMA5D2_CHER, BIT(chan->channel));
 		at91_adc_writel(st, AT91_SAMA5D2_IER, BIT(chan->channel));
 		at91_adc_writel(st, AT91_SAMA5D2_CR, AT91_SAMA5D2_CR_START);
@@ -298,6 +334,8 @@ static int at91_adc_read_raw(struct iio_dev *indio_dev,
 
 		if (ret > 0) {
 			*val = st->conversion_value;
+			if (chan->scan_type.sign == 's')
+				*val = sign_extend32(*val, 11);
 			ret = IIO_VAL_INT;
 			st->conversion_done = false;
 		}
@@ -310,6 +348,8 @@ static int at91_adc_read_raw(struct iio_dev *indio_dev,
 
 	case IIO_CHAN_INFO_SCALE:
 		*val = st->vref_uv / 1000;
+		if (chan->differential)
+			*val *= 2;
 		*val2 = chan->scan_type.realbits;
 		return IIO_VAL_FRACTIONAL_LOG2;
 
@@ -444,6 +484,12 @@ static int at91_adc_probe(struct platform_device *pdev)
 
 	at91_adc_writel(st, AT91_SAMA5D2_CR, AT91_SAMA5D2_CR_SWRST);
 	at91_adc_writel(st, AT91_SAMA5D2_IDR, 0xffffffff);
+	/*
+	 * Transfer field must be set to 2 according to the datasheet and
+	 * allows different analog settings for each channel.
+	 */
+	at91_adc_writel(st, AT91_SAMA5D2_MR,
+			AT91_SAMA5D2_MR_TRANSFER(2) | AT91_SAMA5D2_MR_ANACH);
 
 	at91_adc_setup_samp_freq(st, st->soc_info.min_sample_rate);
 
diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
index 65909d5..502f2fb 100644
--- a/drivers/iio/adc/ina2xx-adc.c
+++ b/drivers/iio/adc/ina2xx-adc.c
@@ -185,9 +185,9 @@ static int ina2xx_read_raw(struct iio_dev *indio_dev,
 	case IIO_CHAN_INFO_SCALE:
 		switch (chan->address) {
 		case INA2XX_SHUNT_VOLTAGE:
-			/* processed (mV) = raw*1000/shunt_div */
+			/* processed (mV) = raw/shunt_div */
 			*val2 = chip->config->shunt_div;
-			*val = 1000;
+			*val = 1;
 			return IIO_VAL_FRACTIONAL;
 
 		case INA2XX_BUS_VOLTAGE:
@@ -350,6 +350,23 @@ static ssize_t ina2xx_allow_async_readout_store(struct device *dev,
 	return len;
 }
 
+/*
+ * Set current LSB to 1mA, shunt is in uOhms
+ * (equation 13 in datasheet). We hardcode a Current_LSB
+ * of 1.0 x10-6. The only remaining parameter is RShunt.
+ * There is no need to expose the CALIBRATION register
+ * to the user for now. But we need to reset this register
+ * if the user updates RShunt after driver init, e.g upon
+ * reading an EEPROM/Probe-type value.
+ */
+static int ina2xx_set_calibration(struct ina2xx_chip_info *chip)
+{
+	u16 regval = DIV_ROUND_CLOSEST(chip->config->calibration_factor,
+				   chip->shunt_resistor);
+
+	return regmap_write(chip->regmap, INA2XX_CALIBRATION, regval);
+}
+
 static int set_shunt_resistor(struct ina2xx_chip_info *chip, unsigned int val)
 {
 	if (val <= 0 || val > chip->config->calibration_factor)
@@ -385,6 +402,11 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
 	if (ret)
 		return ret;
 
+	/* Update the Calibration register */
+	ret = ina2xx_set_calibration(chip);
+	if (ret)
+		return ret;
+
 	return len;
 }
 
@@ -602,24 +624,11 @@ static const struct iio_info ina2xx_info = {
 /* Initialize the configuration and calibration registers. */
 static int ina2xx_init(struct ina2xx_chip_info *chip, unsigned int config)
 {
-	u16 regval;
-	int ret;
-
-	ret = regmap_write(chip->regmap, INA2XX_CONFIG, config);
+	int ret = regmap_write(chip->regmap, INA2XX_CONFIG, config);
 	if (ret)
 		return ret;
 
-	/*
-	 * Set current LSB to 1mA, shunt is in uOhms
-	 * (equation 13 in datasheet). We hardcode a Current_LSB
-	 * of 1.0 x10-6. The only remaining parameter is RShunt.
-	 * There is no need to expose the CALIBRATION register
-	 * to the user for now.
-	 */
-	regval = DIV_ROUND_CLOSEST(chip->config->calibration_factor,
-				   chip->shunt_resistor);
-
-	return regmap_write(chip->regmap, INA2XX_CALIBRATION, regval);
+	return ina2xx_set_calibration(chip);
 }
 
 static int ina2xx_probe(struct i2c_client *client,
diff --git a/drivers/iio/adc/lpc18xx_adc.c b/drivers/iio/adc/lpc18xx_adc.c
new file mode 100644
index 0000000..3ef18f4
--- /dev/null
+++ b/drivers/iio/adc/lpc18xx_adc.c
@@ -0,0 +1,231 @@
+/*
+ * IIO ADC driver for NXP LPC18xx ADC
+ *
+ * Copyright (C) 2016 Joachim Eastwood <manabian@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * UNSUPPORTED hardware features:
+ *  - Hardware triggers
+ *  - Burst mode
+ *  - Interrupts
+ *  - DMA
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/driver.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+
+/* LPC18XX ADC registers and bits */
+#define LPC18XX_ADC_CR			0x000
+#define  LPC18XX_ADC_CR_CLKDIV_SHIFT	8
+#define  LPC18XX_ADC_CR_PDN		BIT(21)
+#define  LPC18XX_ADC_CR_START_NOW	(0x1 << 24)
+#define LPC18XX_ADC_GDR			0x004
+
+/* Data register bits */
+#define LPC18XX_ADC_SAMPLE_SHIFT	6
+#define LPC18XX_ADC_SAMPLE_MASK		0x3ff
+#define LPC18XX_ADC_CONV_DONE		BIT(31)
+
+/* Clock should be 4.5 MHz or less */
+#define LPC18XX_ADC_CLK_TARGET		4500000
+
+struct lpc18xx_adc {
+	struct regulator *vref;
+	void __iomem *base;
+	struct device *dev;
+	struct mutex lock;
+	struct clk *clk;
+	u32 cr_reg;
+};
+
+#define LPC18XX_ADC_CHAN(_idx) {				\
+	.type = IIO_VOLTAGE,					\
+	.indexed = 1,						\
+	.channel = _idx,					\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+}
+
+static const struct iio_chan_spec lpc18xx_adc_iio_channels[] = {
+	LPC18XX_ADC_CHAN(0),
+	LPC18XX_ADC_CHAN(1),
+	LPC18XX_ADC_CHAN(2),
+	LPC18XX_ADC_CHAN(3),
+	LPC18XX_ADC_CHAN(4),
+	LPC18XX_ADC_CHAN(5),
+	LPC18XX_ADC_CHAN(6),
+	LPC18XX_ADC_CHAN(7),
+};
+
+static int lpc18xx_adc_read_chan(struct lpc18xx_adc *adc, unsigned int ch)
+{
+	int ret;
+	u32 reg;
+
+	reg = adc->cr_reg | BIT(ch) | LPC18XX_ADC_CR_START_NOW;
+	writel(reg, adc->base + LPC18XX_ADC_CR);
+
+	ret = readl_poll_timeout(adc->base + LPC18XX_ADC_GDR, reg,
+				 reg & LPC18XX_ADC_CONV_DONE, 3, 9);
+	if (ret) {
+		dev_warn(adc->dev, "adc read timed out\n");
+		return ret;
+	}
+
+	return (reg >> LPC18XX_ADC_SAMPLE_SHIFT) & LPC18XX_ADC_SAMPLE_MASK;
+}
+
+static int lpc18xx_adc_read_raw(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *chan,
+				int *val, int *val2, long mask)
+{
+	struct lpc18xx_adc *adc = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&adc->lock);
+		*val = lpc18xx_adc_read_chan(adc, chan->channel);
+		mutex_unlock(&adc->lock);
+		if (*val < 0)
+			return *val;
+
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = regulator_get_voltage(adc->vref) / 1000;
+		*val2 = 10;
+
+		return IIO_VAL_FRACTIONAL_LOG2;
+	}
+
+	return -EINVAL;
+}
+
+static const struct iio_info lpc18xx_adc_info = {
+	.read_raw = lpc18xx_adc_read_raw,
+	.driver_module = THIS_MODULE,
+};
+
+static int lpc18xx_adc_probe(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev;
+	struct lpc18xx_adc *adc;
+	struct resource *res;
+	unsigned int clkdiv;
+	unsigned long rate;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, indio_dev);
+	adc = iio_priv(indio_dev);
+	adc->dev = &pdev->dev;
+	mutex_init(&adc->lock);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	adc->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(adc->base))
+		return PTR_ERR(adc->base);
+
+	adc->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(adc->clk)) {
+		dev_err(&pdev->dev, "error getting clock\n");
+		return PTR_ERR(adc->clk);
+	}
+
+	rate = clk_get_rate(adc->clk);
+	clkdiv = DIV_ROUND_UP(rate, LPC18XX_ADC_CLK_TARGET);
+
+	adc->vref = devm_regulator_get(&pdev->dev, "vref");
+	if (IS_ERR(adc->vref)) {
+		dev_err(&pdev->dev, "error getting regulator\n");
+		return PTR_ERR(adc->vref);
+	}
+
+	indio_dev->name = dev_name(&pdev->dev);
+	indio_dev->dev.parent = &pdev->dev;
+	indio_dev->info = &lpc18xx_adc_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = lpc18xx_adc_iio_channels;
+	indio_dev->num_channels = ARRAY_SIZE(lpc18xx_adc_iio_channels);
+
+	ret = regulator_enable(adc->vref);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to enable regulator\n");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(adc->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to enable clock\n");
+		goto dis_reg;
+	}
+
+	adc->cr_reg = (clkdiv << LPC18XX_ADC_CR_CLKDIV_SHIFT) |
+			LPC18XX_ADC_CR_PDN;
+	writel(adc->cr_reg, adc->base + LPC18XX_ADC_CR);
+
+	ret = iio_device_register(indio_dev);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to register device\n");
+		goto dis_clk;
+	}
+
+	return 0;
+
+dis_clk:
+	writel(0, adc->base + LPC18XX_ADC_CR);
+	clk_disable_unprepare(adc->clk);
+dis_reg:
+	regulator_disable(adc->vref);
+	return ret;
+}
+
+static int lpc18xx_adc_remove(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct lpc18xx_adc *adc = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+
+	writel(0, adc->base + LPC18XX_ADC_CR);
+	clk_disable_unprepare(adc->clk);
+	regulator_disable(adc->vref);
+
+	return 0;
+}
+
+static const struct of_device_id lpc18xx_adc_match[] = {
+	{ .compatible = "nxp,lpc1850-adc" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, lpc18xx_adc_match);
+
+static struct platform_driver lpc18xx_adc_driver = {
+	.probe	= lpc18xx_adc_probe,
+	.remove	= lpc18xx_adc_remove,
+	.driver	= {
+		.name = "lpc18xx-adc",
+		.of_match_table = lpc18xx_adc_match,
+	},
+};
+module_platform_driver(lpc18xx_adc_driver);
+
+MODULE_DESCRIPTION("LPC18xx ADC driver");
+MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index 9c311c1..f9ad6c2 100644
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -159,6 +159,22 @@ static const struct rockchip_saradc_data rk3066_tsadc_data = {
 	.clk_rate = 50000,
 };
 
+static const struct iio_chan_spec rockchip_rk3399_saradc_iio_channels[] = {
+	ADC_CHANNEL(0, "adc0"),
+	ADC_CHANNEL(1, "adc1"),
+	ADC_CHANNEL(2, "adc2"),
+	ADC_CHANNEL(3, "adc3"),
+	ADC_CHANNEL(4, "adc4"),
+	ADC_CHANNEL(5, "adc5"),
+};
+
+static const struct rockchip_saradc_data rk3399_saradc_data = {
+	.num_bits = 10,
+	.channels = rockchip_rk3399_saradc_iio_channels,
+	.num_channels = ARRAY_SIZE(rockchip_rk3399_saradc_iio_channels),
+	.clk_rate = 1000000,
+};
+
 static const struct of_device_id rockchip_saradc_match[] = {
 	{
 		.compatible = "rockchip,saradc",
@@ -166,6 +182,9 @@ static const struct of_device_id rockchip_saradc_match[] = {
 	}, {
 		.compatible = "rockchip,rk3066-tsadc",
 		.data = &rk3066_tsadc_data,
+	}, {
+		.compatible = "rockchip,rk3399-saradc",
+		.data = &rk3399_saradc_data,
 	},
 	{},
 };
diff --git a/drivers/iio/common/st_sensors/st_sensors_buffer.c b/drivers/iio/common/st_sensors/st_sensors_buffer.c
index e18bc67..7376496 100644
--- a/drivers/iio/common/st_sensors/st_sensors_buffer.c
+++ b/drivers/iio/common/st_sensors/st_sensors_buffer.c
@@ -24,19 +24,13 @@
 
 int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
 {
-	u8 *addr;
+	u8 addr[3]; /* no ST sensor has more than 3 channels */
 	int i, n = 0, len;
 	struct st_sensor_data *sdata = iio_priv(indio_dev);
 	unsigned int num_data_channels = sdata->num_data_channels;
 	unsigned int byte_for_channel =
 			indio_dev->channels[0].scan_type.storagebits >> 3;
 
-	addr = kmalloc(num_data_channels, GFP_KERNEL);
-	if (!addr) {
-		len = -ENOMEM;
-		goto st_sensors_get_buffer_element_error;
-	}
-
 	for (i = 0; i < num_data_channels; i++) {
 		if (test_bit(i, indio_dev->active_scan_mask)) {
 			addr[n] = indio_dev->channels[i].address;
@@ -57,10 +51,8 @@ int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
 			u8 *rx_array;
 			rx_array = kmalloc(byte_for_channel * num_data_channels,
 					   GFP_KERNEL);
-			if (!rx_array) {
-				len = -ENOMEM;
-				goto st_sensors_free_memory;
-			}
+			if (!rx_array)
+				return -ENOMEM;
 
 			len = sdata->tf->read_multiple_byte(&sdata->tb,
 				sdata->dev, addr[0],
@@ -68,7 +60,7 @@ int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
 				rx_array, sdata->multiread_bit);
 			if (len < 0) {
 				kfree(rx_array);
-				goto st_sensors_free_memory;
+				return len;
 			}
 
 			for (i = 0; i < n * byte_for_channel; i++) {
@@ -87,17 +79,11 @@ int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
 			buf, sdata->multiread_bit);
 		break;
 	default:
-		len = -EINVAL;
-		goto st_sensors_free_memory;
-	}
-	if (len != byte_for_channel * n) {
-		len = -EIO;
-		goto st_sensors_free_memory;
+		return -EINVAL;
 	}
+	if (len != byte_for_channel * n)
+		return -EIO;
 
-st_sensors_free_memory:
-	kfree(addr);
-st_sensors_get_buffer_element_error:
 	return len;
 }
 EXPORT_SYMBOL(st_sensors_get_buffer_element);
diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index a995139..210db81 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -154,6 +154,16 @@ config AD7303
 	  To compile this driver as module choose M here: the module will be called
 	  ad7303.
 
+config LPC18XX_DAC
+	tristate "NXP LPC18xx DAC driver"
+	depends on ARCH_LPC18XX || COMPILE_TEST
+	depends on OF && HAS_IOMEM
+	help
+	  Say yes here to build support for NXP LPC18XX DAC.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called lpc18xx_dac.
+
 config M62332
 	tristate "Mitsubishi M62332 DAC driver"
 	depends on I2C
diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
index 67b4842..420a15c 100644
--- a/drivers/iio/dac/Makefile
+++ b/drivers/iio/dac/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_AD5764) += ad5764.o
 obj-$(CONFIG_AD5791) += ad5791.o
 obj-$(CONFIG_AD5686) += ad5686.o
 obj-$(CONFIG_AD7303) += ad7303.o
+obj-$(CONFIG_LPC18XX_DAC) += lpc18xx_dac.o
 obj-$(CONFIG_M62332) += m62332.o
 obj-$(CONFIG_MAX517) += max517.o
 obj-$(CONFIG_MAX5821) += max5821.o
diff --git a/drivers/iio/dac/lpc18xx_dac.c b/drivers/iio/dac/lpc18xx_dac.c
new file mode 100644
index 0000000..55d1456
--- /dev/null
+++ b/drivers/iio/dac/lpc18xx_dac.c
@@ -0,0 +1,210 @@
+/*
+ * IIO DAC driver for NXP LPC18xx DAC
+ *
+ * Copyright (C) 2016 Joachim Eastwood <manabian@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * UNSUPPORTED hardware features:
+ *  - Interrupts
+ *  - DMA
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/driver.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+
+/* LPC18XX DAC registers and bits */
+#define LPC18XX_DAC_CR			0x000
+#define  LPC18XX_DAC_CR_VALUE_SHIFT	6
+#define  LPC18XX_DAC_CR_VALUE_MASK	0x3ff
+#define  LPC18XX_DAC_CR_BIAS		BIT(16)
+#define LPC18XX_DAC_CTRL		0x004
+#define  LPC18XX_DAC_CTRL_DMA_ENA	BIT(3)
+
+struct lpc18xx_dac {
+	struct regulator *vref;
+	void __iomem *base;
+	struct mutex lock;
+	struct clk *clk;
+};
+
+static const struct iio_chan_spec lpc18xx_dac_iio_channels[] = {
+	{
+		.type = IIO_VOLTAGE,
+		.output = 1,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+	},
+};
+
+static int lpc18xx_dac_read_raw(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *chan,
+				int *val, int *val2, long mask)
+{
+	struct lpc18xx_dac *dac = iio_priv(indio_dev);
+	u32 reg;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		reg = readl(dac->base + LPC18XX_DAC_CR);
+		*val = reg >> LPC18XX_DAC_CR_VALUE_SHIFT;
+		*val &= LPC18XX_DAC_CR_VALUE_MASK;
+
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = regulator_get_voltage(dac->vref) / 1000;
+		*val2 = 10;
+
+		return IIO_VAL_FRACTIONAL_LOG2;
+	}
+
+	return -EINVAL;
+}
+
+static int lpc18xx_dac_write_raw(struct iio_dev *indio_dev,
+				 struct iio_chan_spec const *chan,
+				 int val, int val2, long mask)
+{
+	struct lpc18xx_dac *dac = iio_priv(indio_dev);
+	u32 reg;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		if (val < 0 || val > LPC18XX_DAC_CR_VALUE_MASK)
+			return -EINVAL;
+
+		reg = LPC18XX_DAC_CR_BIAS;
+		reg |= val << LPC18XX_DAC_CR_VALUE_SHIFT;
+
+		mutex_lock(&dac->lock);
+		writel(reg, dac->base + LPC18XX_DAC_CR);
+		writel(LPC18XX_DAC_CTRL_DMA_ENA, dac->base + LPC18XX_DAC_CTRL);
+		mutex_unlock(&dac->lock);
+
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static const struct iio_info lpc18xx_dac_info = {
+	.read_raw = lpc18xx_dac_read_raw,
+	.write_raw = lpc18xx_dac_write_raw,
+	.driver_module = THIS_MODULE,
+};
+
+static int lpc18xx_dac_probe(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev;
+	struct lpc18xx_dac *dac;
+	struct resource *res;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*dac));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, indio_dev);
+	dac = iio_priv(indio_dev);
+	mutex_init(&dac->lock);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dac->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(dac->base))
+		return PTR_ERR(dac->base);
+
+	dac->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(dac->clk)) {
+		dev_err(&pdev->dev, "error getting clock\n");
+		return PTR_ERR(dac->clk);
+	}
+
+	dac->vref = devm_regulator_get(&pdev->dev, "vref");
+	if (IS_ERR(dac->vref)) {
+		dev_err(&pdev->dev, "error getting regulator\n");
+		return PTR_ERR(dac->vref);
+	}
+
+	indio_dev->name = dev_name(&pdev->dev);
+	indio_dev->dev.parent = &pdev->dev;
+	indio_dev->info = &lpc18xx_dac_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = lpc18xx_dac_iio_channels;
+	indio_dev->num_channels = ARRAY_SIZE(lpc18xx_dac_iio_channels);
+
+	ret = regulator_enable(dac->vref);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to enable regulator\n");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(dac->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to enable clock\n");
+		goto dis_reg;
+	}
+
+	writel(0, dac->base + LPC18XX_DAC_CTRL);
+	writel(0, dac->base + LPC18XX_DAC_CR);
+
+	ret = iio_device_register(indio_dev);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to register device\n");
+		goto dis_clk;
+	}
+
+	return 0;
+
+dis_clk:
+	clk_disable_unprepare(dac->clk);
+dis_reg:
+	regulator_disable(dac->vref);
+	return ret;
+}
+
+static int lpc18xx_dac_remove(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct lpc18xx_dac *dac = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+
+	writel(0, dac->base + LPC18XX_DAC_CTRL);
+	clk_disable_unprepare(dac->clk);
+	regulator_disable(dac->vref);
+
+	return 0;
+}
+
+static const struct of_device_id lpc18xx_dac_match[] = {
+	{ .compatible = "nxp,lpc1850-dac" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, lpc18xx_dac_match);
+
+static struct platform_driver lpc18xx_dac_driver = {
+	.probe	= lpc18xx_dac_probe,
+	.remove	= lpc18xx_dac_remove,
+	.driver	= {
+		.name = "lpc18xx-dac",
+		.of_match_table = lpc18xx_dac_match,
+	},
+};
+module_platform_driver(lpc18xx_dac_driver);
+
+MODULE_DESCRIPTION("LPC18xx DAC driver");
+MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/gyro/bmg160_core.c b/drivers/iio/gyro/bmg160_core.c
index bbce3b0..2493bb1 100644
--- a/drivers/iio/gyro/bmg160_core.c
+++ b/drivers/iio/gyro/bmg160_core.c
@@ -17,7 +17,6 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
-#include <linux/gpio/consumer.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/iio/iio.h>
@@ -31,7 +30,6 @@
 #include "bmg160.h"
 
 #define BMG160_IRQ_NAME		"bmg160_event"
-#define BMG160_GPIO_NAME		"gpio_int"
 
 #define BMG160_REG_CHIP_ID		0x00
 #define BMG160_CHIP_ID_VAL		0x0F
@@ -116,6 +114,7 @@ enum bmg160_axis {
 	AXIS_X,
 	AXIS_Y,
 	AXIS_Z,
+	AXIS_MAX,
 };
 
 static const struct {
@@ -733,6 +732,7 @@ static const struct iio_event_spec bmg160_event = {
 		.sign = 's',						\
 		.realbits = 16,					\
 		.storagebits = 16,					\
+		.endianness = IIO_LE,					\
 	},								\
 	.event_spec = &bmg160_event,					\
 	.num_event_specs = 1						\
@@ -763,26 +763,23 @@ static const struct iio_info bmg160_info = {
 	.driver_module		= THIS_MODULE,
 };
 
+static const unsigned long bmg160_accel_scan_masks[] = {
+					BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z),
+					0};
+
 static irqreturn_t bmg160_trigger_handler(int irq, void *p)
 {
 	struct iio_poll_func *pf = p;
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct bmg160_data *data = iio_priv(indio_dev);
-	int bit, ret, i = 0;
-	unsigned int val;
+	int ret;
 
 	mutex_lock(&data->mutex);
-	for_each_set_bit(bit, indio_dev->active_scan_mask,
-			 indio_dev->masklength) {
-		ret = regmap_bulk_read(data->regmap, BMG160_AXIS_TO_REG(bit),
-				       &val, 2);
-		if (ret < 0) {
-			mutex_unlock(&data->mutex);
-			goto err;
-		}
-		data->buffer[i++] = ret;
-	}
+	ret = regmap_bulk_read(data->regmap, BMG160_REG_XOUT_L,
+			       data->buffer, AXIS_MAX * 2);
 	mutex_unlock(&data->mutex);
+	if (ret < 0)
+		goto err;
 
 	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 					   pf->timestamp);
@@ -955,29 +952,6 @@ static const struct iio_buffer_setup_ops bmg160_buffer_setup_ops = {
 	.postdisable = bmg160_buffer_postdisable,
 };
 
-static int bmg160_gpio_probe(struct bmg160_data *data)
-
-{
-	struct device *dev;
-	struct gpio_desc *gpio;
-
-	dev = data->dev;
-
-	/* data ready gpio interrupt pin */
-	gpio = devm_gpiod_get_index(dev, BMG160_GPIO_NAME, 0, GPIOD_IN);
-	if (IS_ERR(gpio)) {
-		dev_err(dev, "acpi gpio get index failed\n");
-		return PTR_ERR(gpio);
-	}
-
-	data->irq = gpiod_to_irq(gpio);
-
-	dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio),
-		data->irq);
-
-	return 0;
-}
-
 static const char *bmg160_match_acpi_device(struct device *dev)
 {
 	const struct acpi_device_id *id;
@@ -1019,12 +993,10 @@ int bmg160_core_probe(struct device *dev, struct regmap *regmap, int irq,
 	indio_dev->channels = bmg160_channels;
 	indio_dev->num_channels = ARRAY_SIZE(bmg160_channels);
 	indio_dev->name = name;
+	indio_dev->available_scan_masks = bmg160_accel_scan_masks;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &bmg160_info;
 
-	if (data->irq <= 0)
-		bmg160_gpio_probe(data);
-
 	if (data->irq > 0) {
 		ret = devm_request_threaded_irq(dev,
 						data->irq,
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
index f581256..5ee4e0d 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
@@ -104,6 +104,19 @@ static int inv_mpu6050_deselect_bypass(struct i2c_adapter *adap,
 	return 0;
 }
 
+static const char *inv_mpu_match_acpi_device(struct device *dev, int *chip_id)
+{
+	const struct acpi_device_id *id;
+
+	id = acpi_match_device(dev->driver->acpi_match_table, dev);
+	if (!id)
+		return NULL;
+
+	*chip_id = (int)id->driver_data;
+
+	return dev_name(dev);
+}
+
 /**
  *  inv_mpu_probe() - probe function.
  *  @client:          i2c client.
@@ -115,14 +128,25 @@ static int inv_mpu_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct inv_mpu6050_state *st;
-	int result;
-	const char *name = id ? id->name : NULL;
+	int result, chip_type;
 	struct regmap *regmap;
+	const char *name;
 
 	if (!i2c_check_functionality(client->adapter,
 				     I2C_FUNC_SMBUS_I2C_BLOCK))
 		return -EOPNOTSUPP;
 
+	if (id) {
+		chip_type = (int)id->driver_data;
+		name = id->name;
+	} else if (ACPI_HANDLE(&client->dev)) {
+		name = inv_mpu_match_acpi_device(&client->dev, &chip_type);
+		if (!name)
+			return -ENODEV;
+	} else {
+		return -ENOSYS;
+	}
+
 	regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config);
 	if (IS_ERR(regmap)) {
 		dev_err(&client->dev, "Failed to register i2c regmap %d\n",
@@ -131,7 +155,7 @@ static int inv_mpu_probe(struct i2c_client *client,
 	}
 
 	result = inv_mpu_core_probe(regmap, client->irq, name,
-				    NULL, id->driver_data);
+				    NULL, chip_type);
 	if (result < 0)
 		return result;
 
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
index dea6c43..7bcb8d8 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
@@ -46,6 +46,7 @@ static int inv_mpu_probe(struct spi_device *spi)
 	struct regmap *regmap;
 	const struct spi_device_id *id = spi_get_device_id(spi);
 	const char *name = id ? id->name : NULL;
+	const int chip_type = id ? id->driver_data : 0;
 
 	regmap = devm_regmap_init_spi(spi, &inv_mpu_regmap_config);
 	if (IS_ERR(regmap)) {
@@ -55,7 +56,7 @@ static int inv_mpu_probe(struct spi_device *spi)
 	}
 
 	return inv_mpu_core_probe(regmap, spi->irq, name,
-				  inv_mpu_i2c_disable, id->driver_data);
+				  inv_mpu_i2c_disable, chip_type);
 }
 
 static int inv_mpu_remove(struct spi_device *spi)
diff --git a/drivers/iio/imu/kmx61.c b/drivers/iio/imu/kmx61.c
index e5306b4..2e7dd57 100644
--- a/drivers/iio/imu/kmx61.c
+++ b/drivers/iio/imu/kmx61.c
@@ -14,7 +14,6 @@
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/acpi.h>
-#include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 70cb7eb..190a593 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -25,6 +25,7 @@
 #include <linux/slab.h>
 #include <linux/anon_inodes.h>
 #include <linux/debugfs.h>
+#include <linux/mutex.h>
 #include <linux/iio/iio.h>
 #include "iio_core.h"
 #include "iio_core_trigger.h"
@@ -78,6 +79,7 @@ static const char * const iio_chan_type_name_spec[] = {
 	[IIO_CONCENTRATION] = "concentration",
 	[IIO_RESISTANCE] = "resistance",
 	[IIO_PH] = "ph",
+	[IIO_UVINDEX] = "uvindex",
 };
 
 static const char * const iio_modifier_names[] = {
@@ -100,6 +102,7 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_LIGHT_RED] = "red",
 	[IIO_MOD_LIGHT_GREEN] = "green",
 	[IIO_MOD_LIGHT_BLUE] = "blue",
+	[IIO_MOD_LIGHT_UV] = "uv",
 	[IIO_MOD_QUATERNION] = "quaternion",
 	[IIO_MOD_TEMP_AMBIENT] = "ambient",
 	[IIO_MOD_TEMP_OBJECT] = "object",
@@ -1375,6 +1378,44 @@ void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
 }
 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
 
+/**
+ * iio_device_claim_direct_mode - Keep device in direct mode
+ * @indio_dev:	the iio_dev associated with the device
+ *
+ * If the device is in direct mode it is guaranteed to stay
+ * that way until iio_device_release_direct_mode() is called.
+ *
+ * Use with iio_device_release_direct_mode()
+ *
+ * Returns: 0 on success, -EBUSY on failure
+ */
+int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
+{
+	mutex_lock(&indio_dev->mlock);
+
+	if (iio_buffer_enabled(indio_dev)) {
+		mutex_unlock(&indio_dev->mlock);
+		return -EBUSY;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
+
+/**
+ * iio_device_release_direct_mode - releases claim on direct mode
+ * @indio_dev:	the iio_dev associated with the device
+ *
+ * Release the claim. Device is no longer guaranteed to stay
+ * in direct mode.
+ *
+ * Use with iio_device_claim_direct_mode()
+ */
+void iio_device_release_direct_mode(struct iio_dev *indio_dev)
+{
+	mutex_unlock(&indio_dev->mlock);
+}
+EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
+
 subsys_initcall(iio_init);
 module_exit(iio_exit);
 
diff --git a/drivers/iio/light/stk3310.c b/drivers/iio/light/stk3310.c
index 42d334b..9e847f8 100644
--- a/drivers/iio/light/stk3310.c
+++ b/drivers/iio/light/stk3310.c
@@ -16,7 +16,6 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
-#include <linux/gpio/consumer.h>
 #include <linux/iio/events.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
diff --git a/drivers/iio/light/tsl2563.c b/drivers/iio/light/tsl2563.c
index 12731d6..57b108c 100644
--- a/drivers/iio/light/tsl2563.c
+++ b/drivers/iio/light/tsl2563.c
@@ -806,8 +806,7 @@ static int tsl2563_probe(struct i2c_client *client,
 	return 0;
 
 fail:
-	cancel_delayed_work(&chip->poweroff_work);
-	flush_scheduled_work();
+	cancel_delayed_work_sync(&chip->poweroff_work);
 	return err;
 }
 
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 9c5c9ef..48d127a 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -32,6 +32,7 @@
 #include <linux/gpio.h>
 #include <linux/of_gpio.h>
 #include <linux/acpi.h>
+#include <linux/regulator/consumer.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -361,7 +362,6 @@ static const struct ak_def ak_def_array[AK_MAX_TYPE] = {
 struct ak8975_data {
 	struct i2c_client	*client;
 	const struct ak_def	*def;
-	struct attribute_group	attrs;
 	struct mutex		lock;
 	u8			asa[3];
 	long			raw_to_gauss[3];
@@ -370,8 +370,40 @@ struct ak8975_data {
 	wait_queue_head_t	data_ready_queue;
 	unsigned long		flags;
 	u8			cntl_cache;
+	struct regulator	*vdd;
 };
 
+/* Enable attached power regulator if any. */
+static int ak8975_power_on(struct i2c_client *client)
+{
+	const struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct ak8975_data *data = iio_priv(indio_dev);
+	int ret;
+
+	data->vdd = devm_regulator_get(&client->dev, "vdd");
+	if (IS_ERR_OR_NULL(data->vdd)) {
+		ret = PTR_ERR(data->vdd);
+		if (ret == -ENODEV)
+			ret = 0;
+	} else {
+		ret = regulator_enable(data->vdd);
+	}
+
+	if (ret)
+		dev_err(&client->dev, "failed to enable Vdd supply: %d\n", ret);
+	return ret;
+}
+
+/* Disable attached power regulator if any. */
+static void ak8975_power_off(const struct i2c_client *client)
+{
+	const struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	const struct ak8975_data *data = iio_priv(indio_dev);
+
+	if (!IS_ERR_OR_NULL(data->vdd))
+		regulator_disable(data->vdd);
+}
+
 /*
  * Return 0 if the i2c device is the one we expect.
  * return a negative error number otherwise
@@ -774,8 +806,11 @@ static int ak8975_probe(struct i2c_client *client,
 	if (id) {
 		chipset = (enum asahi_compass_chipset)(id->driver_data);
 		name = id->name;
-	} else if (ACPI_HANDLE(&client->dev))
+	} else if (ACPI_HANDLE(&client->dev)) {
 		name = ak8975_match_acpi_device(&client->dev, &chipset);
+		if (!name)
+			return -ENODEV;
+	}
 	else
 		return -ENOSYS;
 
@@ -786,10 +821,15 @@ static int ak8975_probe(struct i2c_client *client,
 	}
 
 	data->def = &ak_def_array[chipset];
+
+	err = ak8975_power_on(client);
+	if (err)
+		return err;
+
 	err = ak8975_who_i_am(client, data->def->type);
 	if (err < 0) {
 		dev_err(&client->dev, "Unexpected device\n");
-		return err;
+		goto power_off;
 	}
 	dev_dbg(&client->dev, "Asahi compass chip %s\n", name);
 
@@ -797,7 +837,7 @@ static int ak8975_probe(struct i2c_client *client,
 	err = ak8975_setup(client);
 	if (err < 0) {
 		dev_err(&client->dev, "%s initialization fails\n", name);
-		return err;
+		goto power_off;
 	}
 
 	mutex_init(&data->lock);
@@ -807,7 +847,26 @@ static int ak8975_probe(struct i2c_client *client,
 	indio_dev->info = &ak8975_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->name = name;
-	return devm_iio_device_register(&client->dev, indio_dev);
+
+	err = iio_device_register(indio_dev);
+	if (err)
+		goto power_off;
+
+	return 0;
+
+power_off:
+	ak8975_power_off(client);
+	return err;
+}
+
+static int ak8975_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+	iio_device_unregister(indio_dev);
+	ak8975_power_off(client);
+
+	return 0;
 }
 
 static const struct i2c_device_id ak8975_id[] = {
@@ -841,6 +900,7 @@ static struct i2c_driver ak8975_driver = {
 		.acpi_match_table = ACPI_PTR(ak_acpi_match),
 	},
 	.probe		= ak8975_probe,
+	.remove		= ak8975_remove,
 	.id_table	= ak8975_id,
 };
 module_i2c_driver(ak8975_driver);
diff --git a/drivers/iio/magnetometer/bmc150_magn.c b/drivers/iio/magnetometer/bmc150_magn.c
index ffcb75e..0e9da18 100644
--- a/drivers/iio/magnetometer/bmc150_magn.c
+++ b/drivers/iio/magnetometer/bmc150_magn.c
@@ -23,7 +23,6 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
-#include <linux/gpio/consumer.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/iio/iio.h>
diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig
index ffc735c..7ea069b 100644
--- a/drivers/iio/potentiometer/Kconfig
+++ b/drivers/iio/potentiometer/Kconfig
@@ -5,6 +5,24 @@
 
 menu "Digital potentiometers"
 
+config MCP4131
+	tristate "Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X Digital Potentiometer driver"
+	depends on SPI
+	help
+	  Say yes here to build support for the Microchip
+	  MCP4131, MCP4132,
+	  MCP4141, MCP4142,
+	  MCP4151, MCP4152,
+	  MCP4161, MCP4162,
+	  MCP4231, MCP4232,
+	  MCP4241, MCP4242,
+	  MCP4251, MCP4252,
+	  MCP4261, MCP4262,
+	  digital potentiomenter chips.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called mcp4131.
+
 config MCP4531
 	tristate "Microchip MCP45xx/MCP46xx Digital Potentiometer driver"
 	depends on I2C
diff --git a/drivers/iio/potentiometer/Makefile b/drivers/iio/potentiometer/Makefile
index b563b49..91a80f8 100644
--- a/drivers/iio/potentiometer/Makefile
+++ b/drivers/iio/potentiometer/Makefile
@@ -3,5 +3,6 @@
 #
 
 # When adding new entries keep the list in alphabetical order
+obj-$(CONFIG_MCP4131) += mcp4131.o
 obj-$(CONFIG_MCP4531) += mcp4531.o
 obj-$(CONFIG_TPL0102) += tpl0102.o
diff --git a/drivers/iio/potentiometer/mcp4131.c b/drivers/iio/potentiometer/mcp4131.c
new file mode 100644
index 0000000..4e7e2c6
--- /dev/null
+++ b/drivers/iio/potentiometer/mcp4131.c
@@ -0,0 +1,494 @@
+/*
+ * Industrial I/O driver for Microchip digital potentiometers
+ *
+ * Copyright (c) 2016 Slawomir Stepien
+ * Based on: Peter Rosin's code from mcp4531.c
+ *
+ * Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22060b.pdf
+ *
+ * DEVID	#Wipers	#Positions	Resistor Opts (kOhm)
+ * mcp4131	1	129		5, 10, 50, 100
+ * mcp4132	1	129		5, 10, 50, 100
+ * mcp4141	1	129		5, 10, 50, 100
+ * mcp4142	1	129		5, 10, 50, 100
+ * mcp4151	1	257		5, 10, 50, 100
+ * mcp4152	1	257		5, 10, 50, 100
+ * mcp4161	1	257		5, 10, 50, 100
+ * mcp4162	1	257		5, 10, 50, 100
+ * mcp4231	2	129		5, 10, 50, 100
+ * mcp4232	2	129		5, 10, 50, 100
+ * mcp4241	2	129		5, 10, 50, 100
+ * mcp4242	2	129		5, 10, 50, 100
+ * mcp4251	2	257		5, 10, 50, 100
+ * mcp4252	2	257		5, 10, 50, 100
+ * mcp4261	2	257		5, 10, 50, 100
+ * mcp4262	2	257		5, 10, 50, 100
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+/*
+ * TODO:
+ * 1. Write wiper setting to EEPROM for EEPROM capable models.
+ */
+
+#include <linux/cache.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/types.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/spi/spi.h>
+
+#define MCP4131_WRITE		(0x00 << 2)
+#define MCP4131_READ		(0x03 << 2)
+
+#define MCP4131_WIPER_SHIFT	4
+#define MCP4131_CMDERR(r)	((r[0]) & 0x02)
+#define MCP4131_RAW(r)		((r[0]) == 0xff ? 0x100 : (r[1]))
+
+struct mcp4131_cfg {
+	int wipers;
+	int max_pos;
+	int kohms;
+};
+
+enum mcp4131_type {
+	MCP413x_502 = 0,
+	MCP413x_103,
+	MCP413x_503,
+	MCP413x_104,
+	MCP414x_502,
+	MCP414x_103,
+	MCP414x_503,
+	MCP414x_104,
+	MCP415x_502,
+	MCP415x_103,
+	MCP415x_503,
+	MCP415x_104,
+	MCP416x_502,
+	MCP416x_103,
+	MCP416x_503,
+	MCP416x_104,
+	MCP423x_502,
+	MCP423x_103,
+	MCP423x_503,
+	MCP423x_104,
+	MCP424x_502,
+	MCP424x_103,
+	MCP424x_503,
+	MCP424x_104,
+	MCP425x_502,
+	MCP425x_103,
+	MCP425x_503,
+	MCP425x_104,
+	MCP426x_502,
+	MCP426x_103,
+	MCP426x_503,
+	MCP426x_104,
+};
+
+static const struct mcp4131_cfg mcp4131_cfg[] = {
+	[MCP413x_502] = { .wipers = 1, .max_pos = 128, .kohms =   5, },
+	[MCP413x_103] = { .wipers = 1, .max_pos = 128, .kohms =  10, },
+	[MCP413x_503] = { .wipers = 1, .max_pos = 128, .kohms =  50, },
+	[MCP413x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
+	[MCP414x_502] = { .wipers = 1, .max_pos = 128, .kohms =   5, },
+	[MCP414x_103] = { .wipers = 1, .max_pos = 128, .kohms =  10, },
+	[MCP414x_503] = { .wipers = 1, .max_pos = 128, .kohms =  50, },
+	[MCP414x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
+	[MCP415x_502] = { .wipers = 1, .max_pos = 256, .kohms =   5, },
+	[MCP415x_103] = { .wipers = 1, .max_pos = 256, .kohms =  10, },
+	[MCP415x_503] = { .wipers = 1, .max_pos = 256, .kohms =  50, },
+	[MCP415x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
+	[MCP416x_502] = { .wipers = 1, .max_pos = 256, .kohms =   5, },
+	[MCP416x_103] = { .wipers = 1, .max_pos = 256, .kohms =  10, },
+	[MCP416x_503] = { .wipers = 1, .max_pos = 256, .kohms =  50, },
+	[MCP416x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
+	[MCP423x_502] = { .wipers = 2, .max_pos = 128, .kohms =   5, },
+	[MCP423x_103] = { .wipers = 2, .max_pos = 128, .kohms =  10, },
+	[MCP423x_503] = { .wipers = 2, .max_pos = 128, .kohms =  50, },
+	[MCP423x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
+	[MCP424x_502] = { .wipers = 2, .max_pos = 128, .kohms =   5, },
+	[MCP424x_103] = { .wipers = 2, .max_pos = 128, .kohms =  10, },
+	[MCP424x_503] = { .wipers = 2, .max_pos = 128, .kohms =  50, },
+	[MCP424x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
+	[MCP425x_502] = { .wipers = 2, .max_pos = 256, .kohms =   5, },
+	[MCP425x_103] = { .wipers = 2, .max_pos = 256, .kohms =  10, },
+	[MCP425x_503] = { .wipers = 2, .max_pos = 256, .kohms =  50, },
+	[MCP425x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
+	[MCP426x_502] = { .wipers = 2, .max_pos = 256, .kohms =   5, },
+	[MCP426x_103] = { .wipers = 2, .max_pos = 256, .kohms =  10, },
+	[MCP426x_503] = { .wipers = 2, .max_pos = 256, .kohms =  50, },
+	[MCP426x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
+};
+
+struct mcp4131_data {
+	struct spi_device *spi;
+	const struct mcp4131_cfg *cfg;
+	struct mutex lock;
+	u8 buf[2] ____cacheline_aligned;
+};
+
+#define MCP4131_CHANNEL(ch) {					\
+	.type = IIO_RESISTANCE,					\
+	.indexed = 1,						\
+	.output = 1,						\
+	.channel = (ch),					\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+}
+
+static const struct iio_chan_spec mcp4131_channels[] = {
+	MCP4131_CHANNEL(0),
+	MCP4131_CHANNEL(1),
+};
+
+static int mcp4131_read(struct spi_device *spi, void *buf, size_t len)
+{
+	struct spi_transfer t = {
+		.tx_buf = buf, /* We need to send addr, cmd and 12 bits */
+		.rx_buf	= buf,
+		.len = len,
+	};
+	struct spi_message m;
+
+	spi_message_init(&m);
+	spi_message_add_tail(&t, &m);
+
+	return spi_sync(spi, &m);
+}
+
+static int mcp4131_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
+{
+	int err;
+	struct mcp4131_data *data = iio_priv(indio_dev);
+	int address = chan->channel;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&data->lock);
+
+		data->buf[0] = (address << MCP4131_WIPER_SHIFT) | MCP4131_READ;
+		data->buf[1] = 0;
+
+		err = mcp4131_read(data->spi, data->buf, 2);
+		if (err) {
+			mutex_unlock(&data->lock);
+			return err;
+		}
+
+		/* Error, bad address/command combination */
+		if (!MCP4131_CMDERR(data->buf)) {
+			mutex_unlock(&data->lock);
+			return -EIO;
+		}
+
+		*val = MCP4131_RAW(data->buf);
+		mutex_unlock(&data->lock);
+
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = 1000 * data->cfg->kohms;
+		*val2 = data->cfg->max_pos;
+		return IIO_VAL_FRACTIONAL;
+	}
+
+	return -EINVAL;
+}
+
+static int mcp4131_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long mask)
+{
+	int err;
+	struct mcp4131_data *data = iio_priv(indio_dev);
+	int address = chan->channel << MCP4131_WIPER_SHIFT;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		if (val > data->cfg->max_pos || val < 0)
+			return -EINVAL;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	mutex_lock(&data->lock);
+
+	data->buf[0] = address << MCP4131_WIPER_SHIFT;
+	data->buf[0] |= MCP4131_WRITE | (val >> 8);
+	data->buf[1] = val & 0xFF; /* 8 bits here */
+
+	err = spi_write(data->spi, data->buf, 2);
+	mutex_unlock(&data->lock);
+
+	return err;
+}
+
+static const struct iio_info mcp4131_info = {
+	.read_raw = mcp4131_read_raw,
+	.write_raw = mcp4131_write_raw,
+	.driver_module = THIS_MODULE,
+};
+
+static int mcp4131_probe(struct spi_device *spi)
+{
+	int err;
+	struct device *dev = &spi->dev;
+	unsigned long devid = spi_get_device_id(spi)->driver_data;
+	struct mcp4131_data *data;
+	struct iio_dev *indio_dev;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	spi_set_drvdata(spi, indio_dev);
+	data->spi = spi;
+	data->cfg = &mcp4131_cfg[devid];
+
+	mutex_init(&data->lock);
+
+	indio_dev->dev.parent = dev;
+	indio_dev->info = &mcp4131_info;
+	indio_dev->channels = mcp4131_channels;
+	indio_dev->num_channels = data->cfg->wipers;
+	indio_dev->name = spi_get_device_id(spi)->name;
+
+	err = devm_iio_device_register(dev, indio_dev);
+	if (err) {
+		dev_info(&spi->dev, "Unable to register %s\n", indio_dev->name);
+		return err;
+	}
+
+	return 0;
+}
+
+#if defined(CONFIG_OF)
+static const struct of_device_id mcp4131_dt_ids[] = {
+	{ .compatible = "microchip,mcp4131-502",
+		.data = &mcp4131_cfg[MCP413x_502] },
+	{ .compatible = "microchip,mcp4131-103",
+		.data = &mcp4131_cfg[MCP413x_103] },
+	{ .compatible = "microchip,mcp4131-503",
+		.data = &mcp4131_cfg[MCP413x_503] },
+	{ .compatible = "microchip,mcp4131-104",
+		.data = &mcp4131_cfg[MCP413x_104] },
+	{ .compatible = "microchip,mcp4132-502",
+		.data = &mcp4131_cfg[MCP413x_502] },
+	{ .compatible = "microchip,mcp4132-103",
+		.data = &mcp4131_cfg[MCP413x_103] },
+	{ .compatible = "microchip,mcp4132-503",
+		.data = &mcp4131_cfg[MCP413x_503] },
+	{ .compatible = "microchip,mcp4132-104",
+		.data = &mcp4131_cfg[MCP413x_104] },
+	{ .compatible = "microchip,mcp4141-502",
+		.data = &mcp4131_cfg[MCP414x_502] },
+	{ .compatible = "microchip,mcp4141-103",
+		.data = &mcp4131_cfg[MCP414x_103] },
+	{ .compatible = "microchip,mcp4141-503",
+		.data = &mcp4131_cfg[MCP414x_503] },
+	{ .compatible = "microchip,mcp4141-104",
+		.data = &mcp4131_cfg[MCP414x_104] },
+	{ .compatible = "microchip,mcp4142-502",
+		.data = &mcp4131_cfg[MCP414x_502] },
+	{ .compatible = "microchip,mcp4142-103",
+		.data = &mcp4131_cfg[MCP414x_103] },
+	{ .compatible = "microchip,mcp4142-503",
+		.data = &mcp4131_cfg[MCP414x_503] },
+	{ .compatible = "microchip,mcp4142-104",
+		.data = &mcp4131_cfg[MCP414x_104] },
+	{ .compatible = "microchip,mcp4151-502",
+		.data = &mcp4131_cfg[MCP415x_502] },
+	{ .compatible = "microchip,mcp4151-103",
+		.data = &mcp4131_cfg[MCP415x_103] },
+	{ .compatible = "microchip,mcp4151-503",
+		.data = &mcp4131_cfg[MCP415x_503] },
+	{ .compatible = "microchip,mcp4151-104",
+		.data = &mcp4131_cfg[MCP415x_104] },
+	{ .compatible = "microchip,mcp4152-502",
+		.data = &mcp4131_cfg[MCP415x_502] },
+	{ .compatible = "microchip,mcp4152-103",
+		.data = &mcp4131_cfg[MCP415x_103] },
+	{ .compatible = "microchip,mcp4152-503",
+		.data = &mcp4131_cfg[MCP415x_503] },
+	{ .compatible = "microchip,mcp4152-104",
+		.data = &mcp4131_cfg[MCP415x_104] },
+	{ .compatible = "microchip,mcp4161-502",
+		.data = &mcp4131_cfg[MCP416x_502] },
+	{ .compatible = "microchip,mcp4161-103",
+		.data = &mcp4131_cfg[MCP416x_103] },
+	{ .compatible = "microchip,mcp4161-503",
+		.data = &mcp4131_cfg[MCP416x_503] },
+	{ .compatible = "microchip,mcp4161-104",
+		.data = &mcp4131_cfg[MCP416x_104] },
+	{ .compatible = "microchip,mcp4162-502",
+		.data = &mcp4131_cfg[MCP416x_502] },
+	{ .compatible = "microchip,mcp4162-103",
+		.data = &mcp4131_cfg[MCP416x_103] },
+	{ .compatible = "microchip,mcp4162-503",
+		.data = &mcp4131_cfg[MCP416x_503] },
+	{ .compatible = "microchip,mcp4162-104",
+		.data = &mcp4131_cfg[MCP416x_104] },
+	{ .compatible = "microchip,mcp4231-502",
+		.data = &mcp4131_cfg[MCP423x_502] },
+	{ .compatible = "microchip,mcp4231-103",
+		.data = &mcp4131_cfg[MCP423x_103] },
+	{ .compatible = "microchip,mcp4231-503",
+		.data = &mcp4131_cfg[MCP423x_503] },
+	{ .compatible = "microchip,mcp4231-104",
+		.data = &mcp4131_cfg[MCP423x_104] },
+	{ .compatible = "microchip,mcp4232-502",
+		.data = &mcp4131_cfg[MCP423x_502] },
+	{ .compatible = "microchip,mcp4232-103",
+		.data = &mcp4131_cfg[MCP423x_103] },
+	{ .compatible = "microchip,mcp4232-503",
+		.data = &mcp4131_cfg[MCP423x_503] },
+	{ .compatible = "microchip,mcp4232-104",
+		.data = &mcp4131_cfg[MCP423x_104] },
+	{ .compatible = "microchip,mcp4241-502",
+		.data = &mcp4131_cfg[MCP424x_502] },
+	{ .compatible = "microchip,mcp4241-103",
+		.data = &mcp4131_cfg[MCP424x_103] },
+	{ .compatible = "microchip,mcp4241-503",
+		.data = &mcp4131_cfg[MCP424x_503] },
+	{ .compatible = "microchip,mcp4241-104",
+		.data = &mcp4131_cfg[MCP424x_104] },
+	{ .compatible = "microchip,mcp4242-502",
+		.data = &mcp4131_cfg[MCP424x_502] },
+	{ .compatible = "microchip,mcp4242-103",
+		.data = &mcp4131_cfg[MCP424x_103] },
+	{ .compatible = "microchip,mcp4242-503",
+		.data = &mcp4131_cfg[MCP424x_503] },
+	{ .compatible = "microchip,mcp4242-104",
+		.data = &mcp4131_cfg[MCP424x_104] },
+	{ .compatible = "microchip,mcp4251-502",
+		.data = &mcp4131_cfg[MCP425x_502] },
+	{ .compatible = "microchip,mcp4251-103",
+		.data = &mcp4131_cfg[MCP425x_103] },
+	{ .compatible = "microchip,mcp4251-503",
+		.data = &mcp4131_cfg[MCP425x_503] },
+	{ .compatible = "microchip,mcp4251-104",
+		.data = &mcp4131_cfg[MCP425x_104] },
+	{ .compatible = "microchip,mcp4252-502",
+		.data = &mcp4131_cfg[MCP425x_502] },
+	{ .compatible = "microchip,mcp4252-103",
+		.data = &mcp4131_cfg[MCP425x_103] },
+	{ .compatible = "microchip,mcp4252-503",
+		.data = &mcp4131_cfg[MCP425x_503] },
+	{ .compatible = "microchip,mcp4252-104",
+		.data = &mcp4131_cfg[MCP425x_104] },
+	{ .compatible = "microchip,mcp4261-502",
+		.data = &mcp4131_cfg[MCP426x_502] },
+	{ .compatible = "microchip,mcp4261-103",
+		.data = &mcp4131_cfg[MCP426x_103] },
+	{ .compatible = "microchip,mcp4261-503",
+		.data = &mcp4131_cfg[MCP426x_503] },
+	{ .compatible = "microchip,mcp4261-104",
+		.data = &mcp4131_cfg[MCP426x_104] },
+	{ .compatible = "microchip,mcp4262-502",
+		.data = &mcp4131_cfg[MCP426x_502] },
+	{ .compatible = "microchip,mcp4262-103",
+		.data = &mcp4131_cfg[MCP426x_103] },
+	{ .compatible = "microchip,mcp4262-503",
+		.data = &mcp4131_cfg[MCP426x_503] },
+	{ .compatible = "microchip,mcp4262-104",
+		.data = &mcp4131_cfg[MCP426x_104] },
+	{}
+};
+MODULE_DEVICE_TABLE(of, mcp4131_dt_ids);
+#endif /* CONFIG_OF */
+
+static const struct spi_device_id mcp4131_id[] = {
+	{ "mcp4131-502", MCP413x_502 },
+	{ "mcp4131-103", MCP413x_103 },
+	{ "mcp4131-503", MCP413x_503 },
+	{ "mcp4131-104", MCP413x_104 },
+	{ "mcp4132-502", MCP413x_502 },
+	{ "mcp4132-103", MCP413x_103 },
+	{ "mcp4132-503", MCP413x_503 },
+	{ "mcp4132-104", MCP413x_104 },
+	{ "mcp4141-502", MCP414x_502 },
+	{ "mcp4141-103", MCP414x_103 },
+	{ "mcp4141-503", MCP414x_503 },
+	{ "mcp4141-104", MCP414x_104 },
+	{ "mcp4142-502", MCP414x_502 },
+	{ "mcp4142-103", MCP414x_103 },
+	{ "mcp4142-503", MCP414x_503 },
+	{ "mcp4142-104", MCP414x_104 },
+	{ "mcp4151-502", MCP415x_502 },
+	{ "mcp4151-103", MCP415x_103 },
+	{ "mcp4151-503", MCP415x_503 },
+	{ "mcp4151-104", MCP415x_104 },
+	{ "mcp4152-502", MCP415x_502 },
+	{ "mcp4152-103", MCP415x_103 },
+	{ "mcp4152-503", MCP415x_503 },
+	{ "mcp4152-104", MCP415x_104 },
+	{ "mcp4161-502", MCP416x_502 },
+	{ "mcp4161-103", MCP416x_103 },
+	{ "mcp4161-503", MCP416x_503 },
+	{ "mcp4161-104", MCP416x_104 },
+	{ "mcp4162-502", MCP416x_502 },
+	{ "mcp4162-103", MCP416x_103 },
+	{ "mcp4162-503", MCP416x_503 },
+	{ "mcp4162-104", MCP416x_104 },
+	{ "mcp4231-502", MCP423x_502 },
+	{ "mcp4231-103", MCP423x_103 },
+	{ "mcp4231-503", MCP423x_503 },
+	{ "mcp4231-104", MCP423x_104 },
+	{ "mcp4232-502", MCP423x_502 },
+	{ "mcp4232-103", MCP423x_103 },
+	{ "mcp4232-503", MCP423x_503 },
+	{ "mcp4232-104", MCP423x_104 },
+	{ "mcp4241-502", MCP424x_502 },
+	{ "mcp4241-103", MCP424x_103 },
+	{ "mcp4241-503", MCP424x_503 },
+	{ "mcp4241-104", MCP424x_104 },
+	{ "mcp4242-502", MCP424x_502 },
+	{ "mcp4242-103", MCP424x_103 },
+	{ "mcp4242-503", MCP424x_503 },
+	{ "mcp4242-104", MCP424x_104 },
+	{ "mcp4251-502", MCP425x_502 },
+	{ "mcp4251-103", MCP425x_103 },
+	{ "mcp4251-503", MCP425x_503 },
+	{ "mcp4251-104", MCP425x_104 },
+	{ "mcp4252-502", MCP425x_502 },
+	{ "mcp4252-103", MCP425x_103 },
+	{ "mcp4252-503", MCP425x_503 },
+	{ "mcp4252-104", MCP425x_104 },
+	{ "mcp4261-502", MCP426x_502 },
+	{ "mcp4261-103", MCP426x_103 },
+	{ "mcp4261-503", MCP426x_503 },
+	{ "mcp4261-104", MCP426x_104 },
+	{ "mcp4262-502", MCP426x_502 },
+	{ "mcp4262-103", MCP426x_103 },
+	{ "mcp4262-503", MCP426x_503 },
+	{ "mcp4262-104", MCP426x_104 },
+	{}
+};
+MODULE_DEVICE_TABLE(spi, mcp4131_id);
+
+static struct spi_driver mcp4131_driver = {
+	.driver = {
+		.name	= "mcp4131",
+		.of_match_table = of_match_ptr(mcp4131_dt_ids),
+	},
+	.probe		= mcp4131_probe,
+	.id_table	= mcp4131_id,
+};
+
+module_spi_driver(mcp4131_driver);
+
+MODULE_AUTHOR("Slawomir Stepien <sst@poczta.fm>");
+MODULE_DESCRIPTION("MCP4131 digital potentiometer");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/potentiometer/mcp4531.c b/drivers/iio/potentiometer/mcp4531.c
index 0db67fe..3b72e1a 100644
--- a/drivers/iio/potentiometer/mcp4531.c
+++ b/drivers/iio/potentiometer/mcp4531.c
@@ -79,7 +79,7 @@ static const struct mcp4531_cfg mcp4531_cfg[] = {
 
 struct mcp4531_data {
 	struct i2c_client *client;
-	unsigned long devid;
+	const struct mcp4531_cfg *cfg;
 };
 
 #define MCP4531_CHANNEL(ch) {					\
@@ -113,8 +113,8 @@ static int mcp4531_read_raw(struct iio_dev *indio_dev,
 		*val = ret;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
-		*val = 1000 * mcp4531_cfg[data->devid].kohms;
-		*val2 = mcp4531_cfg[data->devid].max_pos;
+		*val = 1000 * data->cfg->kohms;
+		*val2 = data->cfg->max_pos;
 		return IIO_VAL_FRACTIONAL;
 	}
 
@@ -130,7 +130,7 @@ static int mcp4531_write_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		if (val > mcp4531_cfg[data->devid].max_pos || val < 0)
+		if (val > data->cfg->max_pos || val < 0)
 			return -EINVAL;
 		break;
 	default:
@@ -152,7 +152,6 @@ static int mcp4531_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
-	unsigned long devid = id->driver_data;
 	struct mcp4531_data *data;
 	struct iio_dev *indio_dev;
 
@@ -168,12 +167,12 @@ static int mcp4531_probe(struct i2c_client *client,
 	data = iio_priv(indio_dev);
 	i2c_set_clientdata(client, indio_dev);
 	data->client = client;
-	data->devid = devid;
+	data->cfg = &mcp4531_cfg[id->driver_data];
 
 	indio_dev->dev.parent = dev;
 	indio_dev->info = &mcp4531_info;
 	indio_dev->channels = mcp4531_channels;
-	indio_dev->num_channels = mcp4531_cfg[devid].wipers;
+	indio_dev->num_channels = data->cfg->wipers;
 	indio_dev->name = client->name;
 
 	return devm_iio_device_register(dev, indio_dev);
diff --git a/drivers/iio/potentiometer/tpl0102.c b/drivers/iio/potentiometer/tpl0102.c
index 313124b..5c304d4 100644
--- a/drivers/iio/potentiometer/tpl0102.c
+++ b/drivers/iio/potentiometer/tpl0102.c
@@ -118,7 +118,7 @@ static int tpl0102_probe(struct i2c_client *client,
 
 	if (!i2c_check_functionality(client->adapter,
 				     I2C_FUNC_SMBUS_WORD_DATA))
-		return -ENOTSUPP;
+		return -EOPNOTSUPP;
 
 	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
 	if (!indio_dev)
diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
index 31c0e1f..8de0192 100644
--- a/drivers/iio/pressure/Kconfig
+++ b/drivers/iio/pressure/Kconfig
@@ -148,4 +148,14 @@ config T5403
 	  To compile this driver as a module, choose M here: the module
 	  will be called t5403.
 
+config HP206C
+	tristate "HOPERF HP206C precision barometer and altimeter sensor"
+	depends on I2C
+	help
+	  Say yes here to build support for the HOPREF HP206C precision
+	  barometer and altimeter sensor.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called hp206c.
+
 endmenu
diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile
index d336af1..6e60863 100644
--- a/drivers/iio/pressure/Makefile
+++ b/drivers/iio/pressure/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_IIO_ST_PRESS) += st_pressure.o
 st_pressure-y := st_pressure_core.o
 st_pressure-$(CONFIG_IIO_BUFFER) += st_pressure_buffer.o
 obj-$(CONFIG_T5403) += t5403.o
+obj-$(CONFIG_HP206C) += hp206c.o
 
 obj-$(CONFIG_IIO_ST_PRESS_I2C) += st_pressure_i2c.o
 obj-$(CONFIG_IIO_ST_PRESS_SPI) += st_pressure_spi.o
diff --git a/drivers/iio/pressure/hp206c.c b/drivers/iio/pressure/hp206c.c
new file mode 100644
index 0000000..90f2b6e
--- /dev/null
+++ b/drivers/iio/pressure/hp206c.c
@@ -0,0 +1,426 @@
+/*
+ * hp206c.c - HOPERF HP206C precision barometer and altimeter sensor
+ *
+ * Copyright (c) 2016, Intel Corporation.
+ *
+ * This file is subject to the terms and conditions of version 2 of
+ * the GNU General Public License.  See the file COPYING in the main
+ * directory of this archive for more details.
+ *
+ * (7-bit I2C slave address 0x76)
+ *
+ * Datasheet:
+ *  http://www.hoperf.com/upload/sensor/HP206C_DataSheet_EN_V2.0.pdf
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/delay.h>
+#include <linux/util_macros.h>
+#include <linux/acpi.h>
+
+/* I2C commands: */
+#define HP206C_CMD_SOFT_RST	0x06
+
+#define HP206C_CMD_ADC_CVT	0x40
+
+#define HP206C_CMD_ADC_CVT_OSR_4096	0x00
+#define HP206C_CMD_ADC_CVT_OSR_2048	0x04
+#define HP206C_CMD_ADC_CVT_OSR_1024	0x08
+#define HP206C_CMD_ADC_CVT_OSR_512	0x0c
+#define HP206C_CMD_ADC_CVT_OSR_256	0x10
+#define HP206C_CMD_ADC_CVT_OSR_128	0x14
+
+#define HP206C_CMD_ADC_CVT_CHNL_PT	0x00
+#define HP206C_CMD_ADC_CVT_CHNL_T	0x02
+
+#define HP206C_CMD_READ_P	0x30
+#define HP206C_CMD_READ_T	0x32
+
+#define HP206C_CMD_READ_REG	0x80
+#define HP206C_CMD_WRITE_REG	0xc0
+
+#define HP206C_REG_INT_EN	0x0b
+#define HP206C_REG_INT_CFG	0x0c
+
+#define HP206C_REG_INT_SRC	0x0d
+#define HP206C_FLAG_DEV_RDY	0x40
+
+#define HP206C_REG_PARA		0x0f
+#define HP206C_FLAG_CMPS_EN	0x80
+
+/* Maximum spin for DEV_RDY */
+#define HP206C_MAX_DEV_RDY_WAIT_COUNT 20
+#define HP206C_DEV_RDY_WAIT_US    20000
+
+struct hp206c_data {
+	struct mutex mutex;
+	struct i2c_client *client;
+	int temp_osr_index;
+	int pres_osr_index;
+};
+
+struct hp206c_osr_setting {
+	u8 osr_mask;
+	unsigned int temp_conv_time_us;
+	unsigned int pres_conv_time_us;
+};
+
+/* Data from Table 5 in datasheet. */
+static const struct hp206c_osr_setting hp206c_osr_settings[] = {
+	{ HP206C_CMD_ADC_CVT_OSR_4096,	65600,	131100	},
+	{ HP206C_CMD_ADC_CVT_OSR_2048,	32800,	65600	},
+	{ HP206C_CMD_ADC_CVT_OSR_1024,	16400,	32800	},
+	{ HP206C_CMD_ADC_CVT_OSR_512,	8200,	16400	},
+	{ HP206C_CMD_ADC_CVT_OSR_256,	4100,	8200	},
+	{ HP206C_CMD_ADC_CVT_OSR_128,	2100,	4100	},
+};
+static const int hp206c_osr_rates[] = { 4096, 2048, 1024, 512, 256, 128 };
+static const char hp206c_osr_rates_str[] = "4096 2048 1024 512 256 128";
+
+static inline int hp206c_read_reg(struct i2c_client *client, u8 reg)
+{
+	return i2c_smbus_read_byte_data(client, HP206C_CMD_READ_REG | reg);
+}
+
+static inline int hp206c_write_reg(struct i2c_client *client, u8 reg, u8 val)
+{
+	return i2c_smbus_write_byte_data(client,
+			HP206C_CMD_WRITE_REG | reg, val);
+}
+
+static int hp206c_read_20bit(struct i2c_client *client, u8 cmd)
+{
+	int ret;
+	u8 values[3];
+
+	ret = i2c_smbus_read_i2c_block_data(client, cmd, 3, values);
+	if (ret < 0)
+		return ret;
+	if (ret != 3)
+		return -EIO;
+	return ((values[0] & 0xF) << 16) | (values[1] << 8) | (values[2]);
+}
+
+/* Spin for max 160ms until DEV_RDY is 1, or return error. */
+static int hp206c_wait_dev_rdy(struct iio_dev *indio_dev)
+{
+	int ret;
+	int count = 0;
+	struct hp206c_data *data = iio_priv(indio_dev);
+	struct i2c_client *client = data->client;
+
+	while (++count <= HP206C_MAX_DEV_RDY_WAIT_COUNT) {
+		ret = hp206c_read_reg(client, HP206C_REG_INT_SRC);
+		if (ret < 0) {
+			dev_err(&indio_dev->dev, "Failed READ_REG INT_SRC: %d\n", ret);
+			return ret;
+		}
+		if (ret & HP206C_FLAG_DEV_RDY)
+			return 0;
+		usleep_range(HP206C_DEV_RDY_WAIT_US, HP206C_DEV_RDY_WAIT_US * 3 / 2);
+	}
+	return -ETIMEDOUT;
+}
+
+static int hp206c_set_compensation(struct i2c_client *client, bool enabled)
+{
+	int val;
+
+	val = hp206c_read_reg(client, HP206C_REG_PARA);
+	if (val < 0)
+		return val;
+	if (enabled)
+		val |= HP206C_FLAG_CMPS_EN;
+	else
+		val &= ~HP206C_FLAG_CMPS_EN;
+
+	return hp206c_write_reg(client, HP206C_REG_PARA, val);
+}
+
+/* Do a soft reset */
+static int hp206c_soft_reset(struct iio_dev *indio_dev)
+{
+	int ret;
+	struct hp206c_data *data = iio_priv(indio_dev);
+	struct i2c_client *client = data->client;
+
+	ret = i2c_smbus_write_byte(client, HP206C_CMD_SOFT_RST);
+	if (ret) {
+		dev_err(&client->dev, "Failed to reset device: %d\n", ret);
+		return ret;
+	}
+
+	usleep_range(400, 600);
+
+	ret = hp206c_wait_dev_rdy(indio_dev);
+	if (ret) {
+		dev_err(&client->dev, "Device not ready after soft reset: %d\n", ret);
+		return ret;
+	}
+
+	ret = hp206c_set_compensation(client, true);
+	if (ret)
+		dev_err(&client->dev, "Failed to enable compensation: %d\n", ret);
+	return ret;
+}
+
+static int hp206c_conv_and_read(struct iio_dev *indio_dev,
+				u8 conv_cmd, u8 read_cmd,
+				unsigned int sleep_us)
+{
+	int ret;
+	struct hp206c_data *data = iio_priv(indio_dev);
+	struct i2c_client *client = data->client;
+
+	ret = hp206c_wait_dev_rdy(indio_dev);
+	if (ret < 0) {
+		dev_err(&indio_dev->dev, "Device not ready: %d\n", ret);
+		return ret;
+	}
+
+	ret = i2c_smbus_write_byte(client, conv_cmd);
+	if (ret < 0) {
+		dev_err(&indio_dev->dev, "Failed convert: %d\n", ret);
+		return ret;
+	}
+
+	usleep_range(sleep_us, sleep_us * 3 / 2);
+
+	ret = hp206c_wait_dev_rdy(indio_dev);
+	if (ret < 0) {
+		dev_err(&indio_dev->dev, "Device not ready: %d\n", ret);
+		return ret;
+	}
+
+	ret = hp206c_read_20bit(client, read_cmd);
+	if (ret < 0)
+		dev_err(&indio_dev->dev, "Failed read: %d\n", ret);
+
+	return ret;
+}
+
+static int hp206c_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan, int *val,
+			   int *val2, long mask)
+{
+	int ret;
+	struct hp206c_data *data = iio_priv(indio_dev);
+	const struct hp206c_osr_setting *osr_setting;
+	u8 conv_cmd;
+
+	mutex_lock(&data->mutex);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		switch (chan->type) {
+		case IIO_TEMP:
+			*val = hp206c_osr_rates[data->temp_osr_index];
+			ret = IIO_VAL_INT;
+			break;
+
+		case IIO_PRESSURE:
+			*val = hp206c_osr_rates[data->pres_osr_index];
+			ret = IIO_VAL_INT;
+			break;
+		default:
+			ret = -EINVAL;
+		}
+		break;
+
+	case IIO_CHAN_INFO_RAW:
+		switch (chan->type) {
+		case IIO_TEMP:
+			osr_setting = &hp206c_osr_settings[data->temp_osr_index];
+			conv_cmd = HP206C_CMD_ADC_CVT |
+					osr_setting->osr_mask |
+					HP206C_CMD_ADC_CVT_CHNL_T;
+			ret = hp206c_conv_and_read(indio_dev,
+					conv_cmd,
+					HP206C_CMD_READ_T,
+					osr_setting->temp_conv_time_us);
+			if (ret >= 0) {
+				/* 20 significant bits are provided.
+				 * Extend sign over the rest.
+				 */
+				*val = sign_extend32(ret, 19);
+				ret = IIO_VAL_INT;
+			}
+			break;
+
+		case IIO_PRESSURE:
+			osr_setting = &hp206c_osr_settings[data->pres_osr_index];
+			conv_cmd = HP206C_CMD_ADC_CVT |
+					osr_setting->osr_mask |
+					HP206C_CMD_ADC_CVT_CHNL_PT;
+			ret = hp206c_conv_and_read(indio_dev,
+					conv_cmd,
+					HP206C_CMD_READ_P,
+					osr_setting->pres_conv_time_us);
+			if (ret >= 0) {
+				*val = ret;
+				ret = IIO_VAL_INT;
+			}
+			break;
+		default:
+			ret = -EINVAL;
+		}
+		break;
+
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_TEMP:
+			*val = 0;
+			*val2 = 10000;
+			ret = IIO_VAL_INT_PLUS_MICRO;
+			break;
+
+		case IIO_PRESSURE:
+			*val = 0;
+			*val2 = 1000;
+			ret = IIO_VAL_INT_PLUS_MICRO;
+			break;
+		default:
+			ret = -EINVAL;
+		}
+		break;
+
+	default:
+		ret = -EINVAL;
+	}
+
+	mutex_unlock(&data->mutex);
+	return ret;
+}
+
+static int hp206c_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val, int val2, long mask)
+{
+	int ret = 0;
+	struct hp206c_data *data = iio_priv(indio_dev);
+
+	if (mask != IIO_CHAN_INFO_OVERSAMPLING_RATIO)
+		return -EINVAL;
+	mutex_lock(&data->mutex);
+	switch (chan->type) {
+	case IIO_TEMP:
+		data->temp_osr_index = find_closest_descending(val,
+			hp206c_osr_rates, ARRAY_SIZE(hp206c_osr_rates));
+		break;
+	case IIO_PRESSURE:
+		data->pres_osr_index = find_closest_descending(val,
+			hp206c_osr_rates, ARRAY_SIZE(hp206c_osr_rates));
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	mutex_unlock(&data->mutex);
+	return ret;
+}
+
+static const struct iio_chan_spec hp206c_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+	},
+	{
+		.type = IIO_PRESSURE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+	}
+};
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(hp206c_osr_rates_str);
+
+static struct attribute *hp206c_attributes[] = {
+	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group hp206c_attribute_group = {
+	.attrs = hp206c_attributes,
+};
+
+static const struct iio_info hp206c_info = {
+	.attrs = &hp206c_attribute_group,
+	.read_raw = hp206c_read_raw,
+	.write_raw = hp206c_write_raw,
+	.driver_module = THIS_MODULE,
+};
+
+static int hp206c_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct iio_dev *indio_dev;
+	struct hp206c_data *data;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_BYTE |
+				     I2C_FUNC_SMBUS_BYTE_DATA |
+				     I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
+		dev_err(&client->dev, "Adapter does not support "
+				"all required i2c functionality\n");
+		return -ENODEV;
+	}
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	data->client = client;
+	mutex_init(&data->mutex);
+
+	indio_dev->info = &hp206c_info;
+	indio_dev->name = id->name;
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = hp206c_channels;
+	indio_dev->num_channels = ARRAY_SIZE(hp206c_channels);
+
+	i2c_set_clientdata(client, indio_dev);
+
+	/* Do a soft reset on probe */
+	ret = hp206c_soft_reset(indio_dev);
+	if (ret) {
+		dev_err(&client->dev, "Failed to reset on startup: %d\n", ret);
+		return -ENODEV;
+	}
+
+	return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id hp206c_id[] = {
+	{"hp206c"},
+	{}
+};
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id hp206c_acpi_match[] = {
+	{"HOP206C", 0},
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, hp206c_acpi_match);
+#endif
+
+static struct i2c_driver hp206c_driver = {
+	.probe = hp206c_probe,
+	.id_table = hp206c_id,
+	.driver = {
+		.name = "hp206c",
+		.acpi_match_table = ACPI_PTR(hp206c_acpi_match),
+	},
+};
+
+module_i2c_driver(hp206c_driver);
+
+MODULE_DESCRIPTION("HOPERF HP206C precision barometer and altimeter sensor");
+MODULE_AUTHOR("Leonard Crestez <leonard.crestez@intel.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/pressure/ms5611.h b/drivers/iio/pressure/ms5611.h
index 8b08e4b..ccda63c 100644
--- a/drivers/iio/pressure/ms5611.h
+++ b/drivers/iio/pressure/ms5611.h
@@ -16,15 +16,11 @@
 #include <linux/iio/iio.h>
 #include <linux/mutex.h>
 
+struct regulator;
+
 #define MS5611_RESET			0x1e
 #define MS5611_READ_ADC			0x00
 #define MS5611_READ_PROM_WORD		0xA0
-#define MS5611_START_TEMP_CONV		0x58
-#define MS5611_START_PRESSURE_CONV	0x48
-
-#define MS5611_CONV_TIME_MIN		9040
-#define MS5611_CONV_TIME_MAX		10000
-
 #define MS5611_PROM_WORDS_NB		8
 
 enum {
@@ -39,16 +35,31 @@ struct ms5611_chip_info {
 					    s32 *temp, s32 *pressure);
 };
 
+/*
+ * OverSampling Rate descriptor.
+ * Warning: cmd MUST be kept aligned on a word boundary (see
+ * m5611_spi_read_adc_temp_and_pressure in ms5611_spi.c).
+ */
+struct ms5611_osr {
+	unsigned long conv_usec;
+	u8 cmd;
+	unsigned short rate;
+};
+
 struct ms5611_state {
 	void *client;
 	struct mutex lock;
 
+	const struct ms5611_osr *pressure_osr;
+	const struct ms5611_osr *temp_osr;
+
 	int (*reset)(struct device *dev);
 	int (*read_prom_word)(struct device *dev, int index, u16 *word);
 	int (*read_adc_temp_and_pressure)(struct device *dev,
 					  s32 *temp, s32 *pressure);
 
 	struct ms5611_chip_info *chip_info;
+	struct regulator *vdd;
 };
 
 int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
diff --git a/drivers/iio/pressure/ms5611_core.c b/drivers/iio/pressure/ms5611_core.c
index 992ad8d..c4e6586 100644
--- a/drivers/iio/pressure/ms5611_core.c
+++ b/drivers/iio/pressure/ms5611_core.c
@@ -18,11 +18,44 @@
 #include <linux/delay.h>
 #include <linux/regulator/consumer.h>
 
+#include <linux/iio/sysfs.h>
 #include <linux/iio/buffer.h>
 #include <linux/iio/triggered_buffer.h>
 #include <linux/iio/trigger_consumer.h>
 #include "ms5611.h"
 
+#define MS5611_INIT_OSR(_cmd, _conv_usec, _rate) \
+	{ .cmd = _cmd, .conv_usec = _conv_usec, .rate = _rate }
+
+static const struct ms5611_osr ms5611_avail_pressure_osr[] = {
+	MS5611_INIT_OSR(0x40, 600,  256),
+	MS5611_INIT_OSR(0x42, 1170, 512),
+	MS5611_INIT_OSR(0x44, 2280, 1024),
+	MS5611_INIT_OSR(0x46, 4540, 2048),
+	MS5611_INIT_OSR(0x48, 9040, 4096)
+};
+
+static const struct ms5611_osr ms5611_avail_temp_osr[] = {
+	MS5611_INIT_OSR(0x50, 600,  256),
+	MS5611_INIT_OSR(0x52, 1170, 512),
+	MS5611_INIT_OSR(0x54, 2280, 1024),
+	MS5611_INIT_OSR(0x56, 4540, 2048),
+	MS5611_INIT_OSR(0x58, 9040, 4096)
+};
+
+static const char ms5611_show_osr[] = "256 512 1024 2048 4096";
+
+static IIO_CONST_ATTR(oversampling_ratio_available, ms5611_show_osr);
+
+static struct attribute *ms5611_attributes[] = {
+	&iio_const_attr_oversampling_ratio_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group ms5611_attribute_group = {
+	.attrs = ms5611_attributes,
+};
+
 static bool ms5611_prom_is_valid(u16 *prom, size_t len)
 {
 	int i, j;
@@ -239,11 +272,70 @@ static int ms5611_read_raw(struct iio_dev *indio_dev,
 		default:
 			return -EINVAL;
 		}
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		if (chan->type != IIO_TEMP && chan->type != IIO_PRESSURE)
+			break;
+		mutex_lock(&st->lock);
+		if (chan->type == IIO_TEMP)
+			*val = (int)st->temp_osr->rate;
+		else
+			*val = (int)st->pressure_osr->rate;
+		mutex_unlock(&st->lock);
+		return IIO_VAL_INT;
 	}
 
 	return -EINVAL;
 }
 
+static const struct ms5611_osr *ms5611_find_osr(int rate,
+						const struct ms5611_osr *osr,
+						size_t count)
+{
+	unsigned int r;
+
+	for (r = 0; r < count; r++)
+		if ((unsigned short)rate == osr[r].rate)
+			break;
+	if (r >= count)
+		return NULL;
+	return &osr[r];
+}
+
+static int ms5611_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val, int val2, long mask)
+{
+	struct ms5611_state *st = iio_priv(indio_dev);
+	const struct ms5611_osr *osr = NULL;
+
+	if (mask != IIO_CHAN_INFO_OVERSAMPLING_RATIO)
+		return -EINVAL;
+
+	if (chan->type == IIO_TEMP)
+		osr = ms5611_find_osr(val, ms5611_avail_temp_osr,
+				      ARRAY_SIZE(ms5611_avail_temp_osr));
+	else if (chan->type == IIO_PRESSURE)
+		osr = ms5611_find_osr(val, ms5611_avail_pressure_osr,
+				      ARRAY_SIZE(ms5611_avail_pressure_osr));
+	if (!osr)
+		return -EINVAL;
+
+	mutex_lock(&st->lock);
+
+	if (iio_buffer_enabled(indio_dev)) {
+		mutex_unlock(&st->lock);
+		return -EBUSY;
+	}
+
+	if (chan->type == IIO_TEMP)
+		st->temp_osr = osr;
+	else
+		st->pressure_osr = osr;
+
+	mutex_unlock(&st->lock);
+	return 0;
+}
+
 static const unsigned long ms5611_scan_masks[] = {0x3, 0};
 
 static struct ms5611_chip_info chip_info_tbl[] = {
@@ -259,7 +351,8 @@ static const struct iio_chan_spec ms5611_channels[] = {
 	{
 		.type = IIO_PRESSURE,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
-			BIT(IIO_CHAN_INFO_SCALE),
+			BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 		.scan_index = 0,
 		.scan_type = {
 			.sign = 's',
@@ -271,7 +364,8 @@ static const struct iio_chan_spec ms5611_channels[] = {
 	{
 		.type = IIO_TEMP,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
-			BIT(IIO_CHAN_INFO_SCALE),
+			BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 		.scan_index = 1,
 		.scan_type = {
 			.sign = 's',
@@ -285,30 +379,53 @@ static const struct iio_chan_spec ms5611_channels[] = {
 
 static const struct iio_info ms5611_info = {
 	.read_raw = &ms5611_read_raw,
+	.write_raw = &ms5611_write_raw,
+	.attrs = &ms5611_attribute_group,
 	.driver_module = THIS_MODULE,
 };
 
 static int ms5611_init(struct iio_dev *indio_dev)
 {
 	int ret;
-	struct regulator *vdd = devm_regulator_get(indio_dev->dev.parent,
-	                                           "vdd");
+	struct ms5611_state *st = iio_priv(indio_dev);
 
 	/* Enable attached regulator if any. */
-	if (!IS_ERR(vdd)) {
-		ret = regulator_enable(vdd);
+	st->vdd = devm_regulator_get(indio_dev->dev.parent, "vdd");
+	if (!IS_ERR(st->vdd)) {
+		ret = regulator_enable(st->vdd);
 		if (ret) {
 			dev_err(indio_dev->dev.parent,
-			        "failed to enable Vdd supply: %d\n", ret);
+				"failed to enable Vdd supply: %d\n", ret);
 			return ret;
 		}
+	} else {
+		ret = PTR_ERR(st->vdd);
+		if (ret != -ENODEV)
+			return ret;
 	}
 
 	ret = ms5611_reset(indio_dev);
 	if (ret < 0)
-		return ret;
+		goto err_regulator_disable;
 
-	return ms5611_read_prom(indio_dev);
+	ret = ms5611_read_prom(indio_dev);
+	if (ret < 0)
+		goto err_regulator_disable;
+
+	return 0;
+
+err_regulator_disable:
+	if (!IS_ERR_OR_NULL(st->vdd))
+		regulator_disable(st->vdd);
+	return ret;
+}
+
+static void ms5611_fini(const struct iio_dev *indio_dev)
+{
+	const struct ms5611_state *st = iio_priv(indio_dev);
+
+	if (!IS_ERR_OR_NULL(st->vdd))
+		regulator_disable(st->vdd);
 }
 
 int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
@@ -319,6 +436,11 @@ int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
 
 	mutex_init(&st->lock);
 	st->chip_info = &chip_info_tbl[type];
+	st->temp_osr =
+		&ms5611_avail_temp_osr[ARRAY_SIZE(ms5611_avail_temp_osr) - 1];
+	st->pressure_osr =
+		&ms5611_avail_pressure_osr[ARRAY_SIZE(ms5611_avail_pressure_osr)
+					   - 1];
 	indio_dev->dev.parent = dev;
 	indio_dev->name = name;
 	indio_dev->info = &ms5611_info;
@@ -335,7 +457,7 @@ int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
 					 ms5611_trigger_handler, NULL);
 	if (ret < 0) {
 		dev_err(dev, "iio triggered buffer setup failed\n");
-		return ret;
+		goto err_fini;
 	}
 
 	ret = iio_device_register(indio_dev);
@@ -348,7 +470,8 @@ int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
 
 err_buffer_cleanup:
 	iio_triggered_buffer_cleanup(indio_dev);
-
+err_fini:
+	ms5611_fini(indio_dev);
 	return ret;
 }
 EXPORT_SYMBOL(ms5611_probe);
@@ -357,6 +480,7 @@ int ms5611_remove(struct iio_dev *indio_dev)
 {
 	iio_device_unregister(indio_dev);
 	iio_triggered_buffer_cleanup(indio_dev);
+	ms5611_fini(indio_dev);
 
 	return 0;
 }
diff --git a/drivers/iio/pressure/ms5611_i2c.c b/drivers/iio/pressure/ms5611_i2c.c
index 7f6fc8e..55fb5fc 100644
--- a/drivers/iio/pressure/ms5611_i2c.c
+++ b/drivers/iio/pressure/ms5611_i2c.c
@@ -17,6 +17,7 @@
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 
 #include "ms5611.h"
 
@@ -62,23 +63,23 @@ static int ms5611_i2c_read_adc_temp_and_pressure(struct device *dev,
 {
 	int ret;
 	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
+	const struct ms5611_osr *osr = st->temp_osr;
 
-	ret = i2c_smbus_write_byte(st->client, MS5611_START_TEMP_CONV);
+	ret = i2c_smbus_write_byte(st->client, osr->cmd);
 	if (ret < 0)
 		return ret;
 
-	usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
-
+	usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
 	ret = ms5611_i2c_read_adc(st, temp);
 	if (ret < 0)
 		return ret;
 
-	ret = i2c_smbus_write_byte(st->client, MS5611_START_PRESSURE_CONV);
+	osr = st->pressure_osr;
+	ret = i2c_smbus_write_byte(st->client, osr->cmd);
 	if (ret < 0)
 		return ret;
 
-	usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
-
+	usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
 	return ms5611_i2c_read_adc(st, pressure);
 }
 
@@ -113,6 +114,17 @@ static int ms5611_i2c_remove(struct i2c_client *client)
 	return ms5611_remove(i2c_get_clientdata(client));
 }
 
+#if defined(CONFIG_OF)
+static const struct of_device_id ms5611_i2c_matches[] = {
+	{ .compatible = "meas,ms5611" },
+	{ .compatible = "ms5611" },
+	{ .compatible = "meas,ms5607" },
+	{ .compatible = "ms5607" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ms5611_i2c_matches);
+#endif
+
 static const struct i2c_device_id ms5611_id[] = {
 	{ "ms5611", MS5611 },
 	{ "ms5607", MS5607 },
@@ -123,6 +135,7 @@ MODULE_DEVICE_TABLE(i2c, ms5611_id);
 static struct i2c_driver ms5611_driver = {
 	.driver = {
 		.name = "ms5611",
+		.of_match_table = of_match_ptr(ms5611_i2c_matches)
 	},
 	.id_table = ms5611_id,
 	.probe = ms5611_i2c_probe,
diff --git a/drivers/iio/pressure/ms5611_spi.c b/drivers/iio/pressure/ms5611_spi.c
index 5cc009e..7600483 100644
--- a/drivers/iio/pressure/ms5611_spi.c
+++ b/drivers/iio/pressure/ms5611_spi.c
@@ -12,6 +12,7 @@
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/spi/spi.h>
+#include <linux/of_device.h>
 
 #include "ms5611.h"
 
@@ -55,28 +56,29 @@ static int ms5611_spi_read_adc(struct device *dev, s32 *val)
 static int ms5611_spi_read_adc_temp_and_pressure(struct device *dev,
 						 s32 *temp, s32 *pressure)
 {
-	u8 cmd;
 	int ret;
 	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
+	const struct ms5611_osr *osr = st->temp_osr;
 
-	cmd = MS5611_START_TEMP_CONV;
-	ret = spi_write_then_read(st->client, &cmd, 1, NULL, 0);
+	/*
+	 * Warning: &osr->cmd MUST be aligned on a word boundary since used as
+	 * 2nd argument (void*) of spi_write_then_read.
+	 */
+	ret = spi_write_then_read(st->client, &osr->cmd, 1, NULL, 0);
 	if (ret < 0)
 		return ret;
 
-	usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
-
+	usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
 	ret = ms5611_spi_read_adc(dev, temp);
 	if (ret < 0)
 		return ret;
 
-	cmd = MS5611_START_PRESSURE_CONV;
-	ret = spi_write_then_read(st->client, &cmd, 1, NULL, 0);
+	osr = st->pressure_osr;
+	ret = spi_write_then_read(st->client, &osr->cmd, 1, NULL, 0);
 	if (ret < 0)
 		return ret;
 
-	usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
-
+	usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
 	return ms5611_spi_read_adc(dev, pressure);
 }
 
@@ -114,6 +116,17 @@ static int ms5611_spi_remove(struct spi_device *spi)
 	return ms5611_remove(spi_get_drvdata(spi));
 }
 
+#if defined(CONFIG_OF)
+static const struct of_device_id ms5611_spi_matches[] = {
+	{ .compatible = "meas,ms5611" },
+	{ .compatible = "ms5611" },
+	{ .compatible = "meas,ms5607" },
+	{ .compatible = "ms5607" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ms5611_spi_matches);
+#endif
+
 static const struct spi_device_id ms5611_id[] = {
 	{ "ms5611", MS5611 },
 	{ "ms5607", MS5607 },
@@ -124,6 +137,7 @@ MODULE_DEVICE_TABLE(spi, ms5611_id);
 static struct spi_driver ms5611_driver = {
 	.driver = {
 		.name = "ms5611",
+		.of_match_table = of_match_ptr(ms5611_spi_matches)
 	},
 	.id_table = ms5611_id,
 	.probe = ms5611_spi_probe,