pinctrl: Add SX150X GPIO Extender Pinctrl Driver

Since the I2C sx150x GPIO expander driver uses platform_data to manage
the pins configurations, rewrite the driver as a pinctrl driver using
pinconf to get/set pin configurations from DT or debugfs.

The pinctrl driver is functionnally equivalent as the gpio-only driver
and can use DT for pinconf. The platform_data confirmation is dropped.

This patchset removed the gpio-only driver and selects the Pinctrl driver
config instead. This patchset also migrates the gpio dt-bindings to pinctrl
and add the pinctrl optional properties.

The driver was tested with a SX1509 device on a BeagleBone black with
interrupt support and on an X86_64 machine over an I2C to USB converter.

This is a fixed version that builds and runs on non-OF platforms and on
arm based OF. The GPIO version is removed and the bindings are also moved
to the pinctrl bindings.

Changes since v2
 - rebased on v4.9-rc1
 - removed MODULE_DEVICE_TABLE as in upstream bb411e771b0e
   ("gpio: sx150x: fix implicit assumption module.h is present")

Changes since v1
 - Fix Kconfig descriptions on pinctrl and gpio
 - Fix Kconfig dependency
 - Remove oscio support for non-789 devices
 - correct typo in dt bindings
 - remove probe reset for non-789 devices

Changes since RFC
 - Put #ifdef CONFIG_OF/CONFIG_OF_GPIO to remove OF code for non-of platforms
 - No more rely on OF_GPIO config
 - Moved and enhanced bindings to pinctrl bindings
 - Removed gpio-sx150x.c
 - Temporary select PINCTRL_SX150X when GPIO_SX150X
 - Temporary mark GPIO_SX150X as deprecated

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Peter Rosin <peda@axentia.se>
Acked-by: Rob Herring <robh@kernel.org>
ested-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 5 insertions, 801 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 26ee00f..db3f7aa 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -781,16 +781,13 @@ config GPIO_PCF857X
 	  platform-neutral GPIO calls.
 
 config GPIO_SX150X
-	bool "Semtech SX150x I2C GPIO expander"
-	depends on I2C=y
-	select GPIOLIB_IRQCHIP
+	bool "Semtech SX150x I2C GPIO expander (deprecated)"
+	depends on PINCTRL && I2C=y
+	select PINCTRL_SX150X
 	default n
 	help
-	  Say yes here to provide support for Semtech SX150-series I2C
-	  GPIO expanders. Compatible models include:
-
-	  8 bits:  sx1508q
-	  16 bits: sx1509q
+	  Say yes here to provide support for Semtech SX150x-series I2C
+	  GPIO expanders. The GPIO driver was replaced by a Pinctrl version.
 
 config GPIO_TPIC2810
 	tristate "TPIC2810 8-Bit I2C GPO expander"
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index ab28a2d..76c7af6 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -102,7 +102,6 @@ obj-$(CONFIG_GPIO_SPEAR_SPICS)	+= gpio-spear-spics.o
 obj-$(CONFIG_GPIO_STA2X11)	+= gpio-sta2x11.o
 obj-$(CONFIG_GPIO_STMPE)	+= gpio-stmpe.o
 obj-$(CONFIG_GPIO_STP_XWAY)	+= gpio-stp-xway.o
-obj-$(CONFIG_GPIO_SX150X)	+= gpio-sx150x.o
 obj-$(CONFIG_GPIO_SYSCON)	+= gpio-syscon.o
 obj-$(CONFIG_GPIO_TB10X)	+= gpio-tb10x.o
 obj-$(CONFIG_GPIO_TC3589X)	+= gpio-tc3589x.o
diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c
deleted file mode 100644
index af95de8..0000000
--- a/drivers/gpio/gpio-sx150x.c
+++ /dev/null
@@ -1,792 +0,0 @@
-/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
- *
- * Driver for Semtech SX150X I2C GPIO Expanders
- *
- * Author: Gregory Bean <gbean@codeaurora.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- */
-#include <linux/gpio.h>
-#include <linux/i2c.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/mutex.h>
-#include <linux/slab.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/of_gpio.h>
-#include <linux/of_device.h>
-
-#define NO_UPDATE_PENDING	-1
-
-/* The chip models of sx150x */
-#define SX150X_123 0
-#define SX150X_456 1
-#define SX150X_789 2
-
-struct sx150x_123_pri {
-	u8 reg_pld_mode;
-	u8 reg_pld_table0;
-	u8 reg_pld_table1;
-	u8 reg_pld_table2;
-	u8 reg_pld_table3;
-	u8 reg_pld_table4;
-	u8 reg_advance;
-};
-
-struct sx150x_456_pri {
-	u8 reg_pld_mode;
-	u8 reg_pld_table0;
-	u8 reg_pld_table1;
-	u8 reg_pld_table2;
-	u8 reg_pld_table3;
-	u8 reg_pld_table4;
-	u8 reg_advance;
-};
-
-struct sx150x_789_pri {
-	u8 reg_drain;
-	u8 reg_polarity;
-	u8 reg_clock;
-	u8 reg_misc;
-	u8 reg_reset;
-	u8 ngpios;
-};
-
-struct sx150x_device_data {
-	u8 model;
-	u8 reg_pullup;
-	u8 reg_pulldn;
-	u8 reg_dir;
-	u8 reg_data;
-	u8 reg_irq_mask;
-	u8 reg_irq_src;
-	u8 reg_sense;
-	u8 ngpios;
-	union {
-		struct sx150x_123_pri x123;
-		struct sx150x_456_pri x456;
-		struct sx150x_789_pri x789;
-	} pri;
-};
-
-/**
- * struct sx150x_platform_data - config data for SX150x driver
- * @gpio_base: The index number of the first GPIO assigned to this
- *             GPIO expander.  The expander will create a block of
- *             consecutively numbered gpios beginning at the given base,
- *             with the size of the block depending on the model of the
- *             expander chip.
- * @oscio_is_gpo: If set to true, the driver will configure OSCIO as a GPO
- *                instead of as an oscillator, increasing the size of the
- *                GP(I)O pool created by this expander by one.  The
- *                output-only GPO pin will be added at the end of the block.
- * @io_pullup_ena: A bit-mask which enables or disables the pull-up resistor
- *                 for each IO line in the expander.  Setting the bit at
- *                 position n will enable the pull-up for the IO at
- *                 the corresponding offset.  For chips with fewer than
- *                 16 IO pins, high-end bits are ignored.
- * @io_pulldn_ena: A bit-mask which enables-or disables the pull-down
- *                 resistor for each IO line in the expander. Setting the
- *                 bit at position n will enable the pull-down for the IO at
- *                 the corresponding offset.  For chips with fewer than
- *                 16 IO pins, high-end bits are ignored.
- * @io_polarity: A bit-mask which enables polarity inversion for each IO line
- *               in the expander.  Setting the bit at position n inverts
- *               the polarity of that IO line, while clearing it results
- *               in normal polarity. For chips with fewer than 16 IO pins,
- *               high-end bits are ignored.
- * @irq_summary: The 'summary IRQ' line to which the GPIO expander's INT line
- *               is connected, via which it reports interrupt events
- *               across all GPIO lines.  This must be a real,
- *               pre-existing IRQ line.
- *               Setting this value < 0 disables the irq_chip functionality
- *               of the driver.
- * @irq_base: The first 'virtual IRQ' line at which our block of GPIO-based
- *            IRQ lines will appear.  Similarly to gpio_base, the expander
- *            will create a block of irqs beginning at this number.
- *            This value is ignored if irq_summary is < 0.
- * @reset_during_probe: If set to true, the driver will trigger a full
- *                      reset of the chip at the beginning of the probe
- *                      in order to place it in a known state.
- */
-struct sx150x_platform_data {
-	unsigned gpio_base;
-	bool     oscio_is_gpo;
-	u16      io_pullup_ena;
-	u16      io_pulldn_ena;
-	u16      io_polarity;
-	int      irq_summary;
-	unsigned irq_base;
-	bool     reset_during_probe;
-};
-
-struct sx150x_chip {
-	struct gpio_chip                 gpio_chip;
-	struct i2c_client               *client;
-	const struct sx150x_device_data *dev_cfg;
-	int                              irq_summary;
-	int                              irq_base;
-	int				 irq_update;
-	u32                              irq_sense;
-	u32				 irq_masked;
-	u32				 dev_sense;
-	u32				 dev_masked;
-	struct irq_chip                  irq_chip;
-	struct mutex                     lock;
-};
-
-static const struct sx150x_device_data sx150x_devices[] = {
-	[0] = { /* sx1508q */
-		.model = SX150X_789,
-		.reg_pullup	= 0x03,
-		.reg_pulldn	= 0x04,
-		.reg_dir	= 0x07,
-		.reg_data	= 0x08,
-		.reg_irq_mask	= 0x09,
-		.reg_irq_src	= 0x0c,
-		.reg_sense	= 0x0b,
-		.pri.x789 = {
-			.reg_drain	= 0x05,
-			.reg_polarity	= 0x06,
-			.reg_clock	= 0x0f,
-			.reg_misc	= 0x10,
-			.reg_reset	= 0x7d,
-		},
-		.ngpios = 8,
-	},
-	[1] = { /* sx1509q */
-		.model = SX150X_789,
-		.reg_pullup	= 0x07,
-		.reg_pulldn	= 0x09,
-		.reg_dir	= 0x0f,
-		.reg_data	= 0x11,
-		.reg_irq_mask	= 0x13,
-		.reg_irq_src	= 0x19,
-		.reg_sense	= 0x17,
-		.pri.x789 = {
-			.reg_drain	= 0x0b,
-			.reg_polarity	= 0x0d,
-			.reg_clock	= 0x1e,
-			.reg_misc	= 0x1f,
-			.reg_reset	= 0x7d,
-		},
-		.ngpios	= 16
-	},
-	[2] = { /* sx1506q */
-		.model = SX150X_456,
-		.reg_pullup	= 0x05,
-		.reg_pulldn	= 0x07,
-		.reg_dir	= 0x03,
-		.reg_data	= 0x01,
-		.reg_irq_mask	= 0x09,
-		.reg_irq_src	= 0x0f,
-		.reg_sense	= 0x0d,
-		.pri.x456 = {
-			.reg_pld_mode	= 0x21,
-			.reg_pld_table0	= 0x23,
-			.reg_pld_table1	= 0x25,
-			.reg_pld_table2	= 0x27,
-			.reg_pld_table3	= 0x29,
-			.reg_pld_table4	= 0x2b,
-			.reg_advance	= 0xad,
-		},
-		.ngpios	= 16
-	},
-	[3] = { /* sx1502q */
-		.model = SX150X_123,
-		.reg_pullup	= 0x02,
-		.reg_pulldn	= 0x03,
-		.reg_dir	= 0x01,
-		.reg_data	= 0x00,
-		.reg_irq_mask	= 0x05,
-		.reg_irq_src	= 0x08,
-		.reg_sense	= 0x07,
-		.pri.x123 = {
-			.reg_pld_mode	= 0x10,
-			.reg_pld_table0	= 0x11,
-			.reg_pld_table1	= 0x12,
-			.reg_pld_table2	= 0x13,
-			.reg_pld_table3	= 0x14,
-			.reg_pld_table4	= 0x15,
-			.reg_advance	= 0xad,
-		},
-		.ngpios	= 8,
-	},
-};
-
-static const struct i2c_device_id sx150x_id[] = {
-	{"sx1508q", 0},
-	{"sx1509q", 1},
-	{"sx1506q", 2},
-	{"sx1502q", 3},
-	{}
-};
-
-static const struct of_device_id sx150x_of_match[] = {
-	{ .compatible = "semtech,sx1508q" },
-	{ .compatible = "semtech,sx1509q" },
-	{ .compatible = "semtech,sx1506q" },
-	{ .compatible = "semtech,sx1502q" },
-	{},
-};
-
-static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val)
-{
-	s32 err = i2c_smbus_write_byte_data(client, reg, val);
-
-	if (err < 0)
-		dev_warn(&client->dev,
-			"i2c write fail: can't write %02x to %02x: %d\n",
-			val, reg, err);
-	return err;
-}
-
-static s32 sx150x_i2c_read(struct i2c_client *client, u8 reg, u8 *val)
-{
-	s32 err = i2c_smbus_read_byte_data(client, reg);
-
-	if (err >= 0)
-		*val = err;
-	else
-		dev_warn(&client->dev,
-			"i2c read fail: can't read from %02x: %d\n",
-			reg, err);
-	return err;
-}
-
-static inline bool offset_is_oscio(struct sx150x_chip *chip, unsigned offset)
-{
-	return (chip->dev_cfg->ngpios == offset);
-}
-
-/*
- * These utility functions solve the common problem of locating and setting
- * configuration bits.  Configuration bits are grouped into registers
- * whose indexes increase downwards.  For example, with eight-bit registers,
- * sixteen gpios would have their config bits grouped in the following order:
- * REGISTER N-1 [ f e d c b a 9 8 ]
- *          N   [ 7 6 5 4 3 2 1 0 ]
- *
- * For multi-bit configurations, the pattern gets wider:
- * REGISTER N-3 [ f f e e d d c c ]
- *          N-2 [ b b a a 9 9 8 8 ]
- *          N-1 [ 7 7 6 6 5 5 4 4 ]
- *          N   [ 3 3 2 2 1 1 0 0 ]
- *
- * Given the address of the starting register 'N', the index of the gpio
- * whose configuration we seek to change, and the width in bits of that
- * configuration, these functions allow us to locate the correct
- * register and mask the correct bits.
- */
-static inline void sx150x_find_cfg(u8 offset, u8 width,
-				u8 *reg, u8 *mask, u8 *shift)
-{
-	*reg   -= offset * width / 8;
-	*mask   = (1 << width) - 1;
-	*shift  = (offset * width) % 8;
-	*mask <<= *shift;
-}
-
-static s32 sx150x_write_cfg(struct sx150x_chip *chip,
-			u8 offset, u8 width, u8 reg, u8 val)
-{
-	u8  mask;
-	u8  data;
-	u8  shift;
-	s32 err;
-
-	sx150x_find_cfg(offset, width, &reg, &mask, &shift);
-	err = sx150x_i2c_read(chip->client, reg, &data);
-	if (err < 0)
-		return err;
-
-	data &= ~mask;
-	data |= (val << shift) & mask;
-	return sx150x_i2c_write(chip->client, reg, data);
-}
-
-static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset)
-{
-	u8  reg = chip->dev_cfg->reg_data;
-	u8  mask;
-	u8  data;
-	u8  shift;
-	s32 err;
-
-	sx150x_find_cfg(offset, 1, &reg, &mask, &shift);
-	err = sx150x_i2c_read(chip->client, reg, &data);
-	if (err >= 0)
-		err = (data & mask) != 0 ? 1 : 0;
-
-	return err;
-}
-
-static void sx150x_set_oscio(struct sx150x_chip *chip, int val)
-{
-	sx150x_i2c_write(chip->client,
-			chip->dev_cfg->pri.x789.reg_clock,
-			(val ? 0x1f : 0x10));
-}
-
-static void sx150x_set_io(struct sx150x_chip *chip, unsigned offset, int val)
-{
-	sx150x_write_cfg(chip,
-			offset,
-			1,
-			chip->dev_cfg->reg_data,
-			(val ? 1 : 0));
-}
-
-static int sx150x_io_input(struct sx150x_chip *chip, unsigned offset)
-{
-	return sx150x_write_cfg(chip,
-				offset,
-				1,
-				chip->dev_cfg->reg_dir,
-				1);
-}
-
-static int sx150x_io_output(struct sx150x_chip *chip, unsigned offset, int val)
-{
-	int err;
-
-	err = sx150x_write_cfg(chip,
-			offset,
-			1,
-			chip->dev_cfg->reg_data,
-			(val ? 1 : 0));
-	if (err >= 0)
-		err = sx150x_write_cfg(chip,
-				offset,
-				1,
-				chip->dev_cfg->reg_dir,
-				0);
-	return err;
-}
-
-static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset)
-{
-	struct sx150x_chip *chip = gpiochip_get_data(gc);
-	int status = -EINVAL;
-
-	if (!offset_is_oscio(chip, offset)) {
-		mutex_lock(&chip->lock);
-		status = sx150x_get_io(chip, offset);
-		mutex_unlock(&chip->lock);
-	}
-
-	return (status < 0) ? status : !!status;
-}
-
-static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val)
-{
-	struct sx150x_chip *chip = gpiochip_get_data(gc);
-
-	mutex_lock(&chip->lock);
-	if (offset_is_oscio(chip, offset))
-		sx150x_set_oscio(chip, val);
-	else
-		sx150x_set_io(chip, offset, val);
-	mutex_unlock(&chip->lock);
-}
-
-static int sx150x_gpio_set_single_ended(struct gpio_chip *gc,
-					unsigned offset,
-                                        enum single_ended_mode mode)
-{
-	struct sx150x_chip *chip = gpiochip_get_data(gc);
-
-	/* On the SX160X 789 we can set open drain */
-	if (chip->dev_cfg->model != SX150X_789)
-		return -ENOTSUPP;
-
-	if (mode == LINE_MODE_PUSH_PULL)
-		return sx150x_write_cfg(chip,
-					offset,
-					1,
-					chip->dev_cfg->pri.x789.reg_drain,
-					0);
-
-	if (mode == LINE_MODE_OPEN_DRAIN)
-		return sx150x_write_cfg(chip,
-					offset,
-					1,
-					chip->dev_cfg->pri.x789.reg_drain,
-					1);
-	return -ENOTSUPP;
-}
-
-static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
-{
-	struct sx150x_chip *chip = gpiochip_get_data(gc);
-	int status = -EINVAL;
-
-	if (!offset_is_oscio(chip, offset)) {
-		mutex_lock(&chip->lock);
-		status = sx150x_io_input(chip, offset);
-		mutex_unlock(&chip->lock);
-	}
-	return status;
-}
-
-static int sx150x_gpio_direction_output(struct gpio_chip *gc,
-					unsigned offset,
-					int val)
-{
-	struct sx150x_chip *chip = gpiochip_get_data(gc);
-	int status = 0;
-
-	if (!offset_is_oscio(chip, offset)) {
-		mutex_lock(&chip->lock);
-		status = sx150x_io_output(chip, offset, val);
-		mutex_unlock(&chip->lock);
-	}
-	return status;
-}
-
-static void sx150x_irq_mask(struct irq_data *d)
-{
-	struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
-	unsigned n = d->hwirq;
-
-	chip->irq_masked |= (1 << n);
-	chip->irq_update = n;
-}
-
-static void sx150x_irq_unmask(struct irq_data *d)
-{
-	struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
-	unsigned n = d->hwirq;
-
-	chip->irq_masked &= ~(1 << n);
-	chip->irq_update = n;
-}
-
-static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
-{
-	struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
-	unsigned n, val = 0;
-
-	if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
-		return -EINVAL;
-
-	n = d->hwirq;
-
-	if (flow_type & IRQ_TYPE_EDGE_RISING)
-		val |= 0x1;
-	if (flow_type & IRQ_TYPE_EDGE_FALLING)
-		val |= 0x2;
-
-	chip->irq_sense &= ~(3UL << (n * 2));
-	chip->irq_sense |= val << (n * 2);
-	chip->irq_update = n;
-	return 0;
-}
-
-static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
-{
-	struct sx150x_chip *chip = (struct sx150x_chip *)dev_id;
-	unsigned nhandled = 0;
-	unsigned sub_irq;
-	unsigned n;
-	s32 err;
-	u8 val;
-	int i;
-
-	for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) {
-		err = sx150x_i2c_read(chip->client,
-				      chip->dev_cfg->reg_irq_src - i,
-				      &val);
-		if (err < 0)
-			continue;
-
-		sx150x_i2c_write(chip->client,
-				chip->dev_cfg->reg_irq_src - i,
-				val);
-		for (n = 0; n < 8; ++n) {
-			if (val & (1 << n)) {
-				sub_irq = irq_find_mapping(
-					chip->gpio_chip.irqdomain,
-					(i * 8) + n);
-				handle_nested_irq(sub_irq);
-				++nhandled;
-			}
-		}
-	}
-
-	return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
-}
-
-static void sx150x_irq_bus_lock(struct irq_data *d)
-{
-	struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
-
-	mutex_lock(&chip->lock);
-}
-
-static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
-{
-	struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
-	unsigned n;
-
-	if (chip->irq_update == NO_UPDATE_PENDING)
-		goto out;
-
-	n = chip->irq_update;
-	chip->irq_update = NO_UPDATE_PENDING;
-
-	/* Avoid updates if nothing changed */
-	if (chip->dev_sense == chip->irq_sense &&
-	    chip->dev_masked == chip->irq_masked)
-		goto out;
-
-	chip->dev_sense = chip->irq_sense;
-	chip->dev_masked = chip->irq_masked;
-
-	if (chip->irq_masked & (1 << n)) {
-		sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 1);
-		sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, 0);
-	} else {
-		sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 0);
-		sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense,
-				 chip->irq_sense >> (n * 2));
-	}
-out:
-	mutex_unlock(&chip->lock);
-}
-
-static void sx150x_init_chip(struct sx150x_chip *chip,
-			struct i2c_client *client,
-			kernel_ulong_t driver_data,
-			struct sx150x_platform_data *pdata)
-{
-	mutex_init(&chip->lock);
-
-	chip->client                     = client;
-	chip->dev_cfg                    = &sx150x_devices[driver_data];
-	chip->gpio_chip.parent              = &client->dev;
-	chip->gpio_chip.label            = client->name;
-	chip->gpio_chip.direction_input  = sx150x_gpio_direction_input;
-	chip->gpio_chip.direction_output = sx150x_gpio_direction_output;
-	chip->gpio_chip.get              = sx150x_gpio_get;
-	chip->gpio_chip.set              = sx150x_gpio_set;
-	chip->gpio_chip.set_single_ended = sx150x_gpio_set_single_ended;
-	chip->gpio_chip.base             = pdata->gpio_base;
-	chip->gpio_chip.can_sleep        = true;
-	chip->gpio_chip.ngpio            = chip->dev_cfg->ngpios;
-#ifdef CONFIG_OF_GPIO
-	chip->gpio_chip.of_node          = client->dev.of_node;
-	chip->gpio_chip.of_gpio_n_cells  = 2;
-#endif
-	if (pdata->oscio_is_gpo)
-		++chip->gpio_chip.ngpio;
-
-	chip->irq_chip.name                = client->name;
-	chip->irq_chip.irq_mask            = sx150x_irq_mask;
-	chip->irq_chip.irq_unmask          = sx150x_irq_unmask;
-	chip->irq_chip.irq_set_type        = sx150x_irq_set_type;
-	chip->irq_chip.irq_bus_lock        = sx150x_irq_bus_lock;
-	chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
-	chip->irq_summary                  = -1;
-	chip->irq_base                     = -1;
-	chip->irq_masked                   = ~0;
-	chip->irq_sense                    = 0;
-	chip->dev_masked                   = ~0;
-	chip->dev_sense                    = 0;
-	chip->irq_update		   = NO_UPDATE_PENDING;
-}
-
-static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg)
-{
-	int err = 0;
-	unsigned n;
-
-	for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n)
-		err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8));
-	return err;
-}
-
-static int sx150x_reset(struct sx150x_chip *chip)
-{
-	int err;
-
-	err = i2c_smbus_write_byte_data(chip->client,
-					chip->dev_cfg->pri.x789.reg_reset,
-					0x12);
-	if (err < 0)
-		return err;
-
-	err = i2c_smbus_write_byte_data(chip->client,
-					chip->dev_cfg->pri.x789.reg_reset,
-					0x34);
-	return err;
-}
-
-static int sx150x_init_hw(struct sx150x_chip *chip,
-			struct sx150x_platform_data *pdata)
-{
-	int err = 0;
-
-	if (pdata->reset_during_probe) {
-		err = sx150x_reset(chip);
-		if (err < 0)
-			return err;
-	}
-
-	if (chip->dev_cfg->model == SX150X_789)
-		err = sx150x_i2c_write(chip->client,
-				chip->dev_cfg->pri.x789.reg_misc,
-				0x01);
-	else if (chip->dev_cfg->model == SX150X_456)
-		err = sx150x_i2c_write(chip->client,
-				chip->dev_cfg->pri.x456.reg_advance,
-				0x04);
-	else
-		err = sx150x_i2c_write(chip->client,
-				chip->dev_cfg->pri.x123.reg_advance,
-				0x00);
-	if (err < 0)
-		return err;
-
-	err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup,
-			pdata->io_pullup_ena);
-	if (err < 0)
-		return err;
-
-	err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn,
-			pdata->io_pulldn_ena);
-	if (err < 0)
-		return err;
-
-	if (chip->dev_cfg->model == SX150X_789) {
-		err = sx150x_init_io(chip,
-				chip->dev_cfg->pri.x789.reg_polarity,
-				pdata->io_polarity);
-		if (err < 0)
-			return err;
-	} else if (chip->dev_cfg->model == SX150X_456) {
-		/* Set all pins to work in normal mode */
-		err = sx150x_init_io(chip,
-				chip->dev_cfg->pri.x456.reg_pld_mode,
-				0);
-		if (err < 0)
-			return err;
-	} else {
-		/* Set all pins to work in normal mode */
-		err = sx150x_init_io(chip,
-				chip->dev_cfg->pri.x123.reg_pld_mode,
-				0);
-		if (err < 0)
-			return err;
-	}
-
-
-	if (pdata->oscio_is_gpo)
-		sx150x_set_oscio(chip, 0);
-
-	return err;
-}
-
-static int sx150x_install_irq_chip(struct sx150x_chip *chip,
-				int irq_summary,
-				int irq_base)
-{
-	int err;
-
-	chip->irq_summary = irq_summary;
-	chip->irq_base    = irq_base;
-
-	/* Add gpio chip to irq subsystem */
-	err = gpiochip_irqchip_add(&chip->gpio_chip,
-		&chip->irq_chip, chip->irq_base,
-		handle_edge_irq, IRQ_TYPE_EDGE_BOTH);
-	if (err) {
-		dev_err(&chip->client->dev,
-			"could not connect irqchip to gpiochip\n");
-		return  err;
-	}
-
-	err = devm_request_threaded_irq(&chip->client->dev,
-			irq_summary, NULL, sx150x_irq_thread_fn,
-			IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_FALLING,
-			chip->irq_chip.name, chip);
-	if (err < 0) {
-		chip->irq_summary = -1;
-		chip->irq_base    = -1;
-	}
-
-	return err;
-}
-
-static int sx150x_probe(struct i2c_client *client,
-				const struct i2c_device_id *id)
-{
-	static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
-				     I2C_FUNC_SMBUS_WRITE_WORD_DATA;
-	struct sx150x_platform_data *pdata;
-	struct sx150x_chip *chip;
-	int rc;
-
-	pdata = dev_get_platdata(&client->dev);
-	if (!pdata)
-		return -EINVAL;
-
-	if (!i2c_check_functionality(client->adapter, i2c_funcs))
-		return -ENOSYS;
-
-	chip = devm_kzalloc(&client->dev,
-		sizeof(struct sx150x_chip), GFP_KERNEL);
-	if (!chip)
-		return -ENOMEM;
-
-	sx150x_init_chip(chip, client, id->driver_data, pdata);
-	rc = sx150x_init_hw(chip, pdata);
-	if (rc < 0)
-		return rc;
-
-	rc = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
-	if (rc)
-		return rc;
-
-	if (pdata->irq_summary >= 0) {
-		rc = sx150x_install_irq_chip(chip,
-					pdata->irq_summary,
-					pdata->irq_base);
-		if (rc < 0)
-			return rc;
-	}
-
-	i2c_set_clientdata(client, chip);
-
-	return 0;
-}
-
-static struct i2c_driver sx150x_driver = {
-	.driver = {
-		.name = "sx150x",
-		.of_match_table = of_match_ptr(sx150x_of_match),
-	},
-	.probe    = sx150x_probe,
-	.id_table = sx150x_id,
-};
-
-static int __init sx150x_init(void)
-{
-	return i2c_add_driver(&sx150x_driver);
-}
-subsys_initcall(sx150x_init);