Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6:
  regulator: max8952 - fix max8952_set_voltage
  regulator: max8952 - fix max8952_pmic_probe error path
  regulator: fix build when CONFIG_REGULATOR_DUMMY=n
  regulator: avoid deadlock when disabling regulator with supply
  regulator: Add option for machine drivers to enable the dummy regulator
  Regulator: lp3972 cleanup
  Regulator: LP3972 PMIC regulator driver
  MAX8952 PMIC Driver Initial Release

9 files changed, 1280 insertions, 15 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 172951b..dd30e88 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -100,6 +100,14 @@ config REGULATOR_MAX8925
 	help
 	  Say y here to support the voltage regulaltor of Maxim MAX8925 PMIC.
 
+config REGULATOR_MAX8952
+	tristate "Maxim MAX8952 Power Management IC"
+	depends on I2C
+	help
+	  This driver controls a Maxim 8952 voltage output regulator
+	  via I2C bus. Maxim 8952 has one voltage output and supports 4 DVS
+	  modes ranging from 0.77V to 1.40V by 0.01V steps.
+
 config REGULATOR_MAX8998
 	tristate "Maxim 8998 voltage regulator"
 	depends on MFD_MAX8998
@@ -164,6 +172,13 @@ config REGULATOR_LP3971
 	 Say Y here to support the voltage regulators and convertors
 	 on National Semiconductors LP3971 PMIC
 
+config REGULATOR_LP3972
+	tristate "National Semiconductors LP3972 PMIC regulator driver"
+	depends on I2C
+	help
+	 Say Y here to support the voltage regulators and convertors
+	 on National Semiconductors LP3972 PMIC
+
 config REGULATOR_PCAP
 	tristate "PCAP2 regulator driver"
 	depends on EZX_PCAP
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 8285fd8..bff8157 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -3,20 +3,21 @@
 #
 
 
-obj-$(CONFIG_REGULATOR) += core.o
+obj-$(CONFIG_REGULATOR) += core.o dummy.o
 obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o
 obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o
 obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
 
 obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
 obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
-obj-$(CONFIG_REGULATOR_DUMMY) += dummy.o
 obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o
+obj-$(CONFIG_REGULATOR_LP3972) += lp3972.o
 obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
 obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o
 obj-$(CONFIG_REGULATOR_MAX8649)	+= max8649.o
 obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o
 obj-$(CONFIG_REGULATOR_MAX8925) += max8925-regulator.o
+obj-$(CONFIG_REGULATOR_MAX8952) += max8952.o
 obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
 obj-$(CONFIG_REGULATOR_WM831X) += wm831x-dcdc.o
 obj-$(CONFIG_REGULATOR_WM831X) += wm831x-isink.o
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index cc8b337..f1d10c9 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -33,6 +33,7 @@ static DEFINE_MUTEX(regulator_list_mutex);
 static LIST_HEAD(regulator_list);
 static LIST_HEAD(regulator_map_list);
 static int has_full_constraints;
+static bool board_wants_dummy_regulator;
 
 /*
  * struct regulator_map
@@ -63,7 +64,8 @@ struct regulator {
 };
 
 static int _regulator_is_enabled(struct regulator_dev *rdev);
-static int _regulator_disable(struct regulator_dev *rdev);
+static int _regulator_disable(struct regulator_dev *rdev,
+		struct regulator_dev **supply_rdev_ptr);
 static int _regulator_get_voltage(struct regulator_dev *rdev);
 static int _regulator_get_current_limit(struct regulator_dev *rdev);
 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
@@ -1108,6 +1110,11 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
 		}
 	}
 
+	if (board_wants_dummy_regulator) {
+		rdev = dummy_regulator_rdev;
+		goto found;
+	}
+
 #ifdef CONFIG_REGULATOR_DUMMY
 	if (!devname)
 		devname = "deviceless";
@@ -1348,7 +1355,8 @@ int regulator_enable(struct regulator *regulator)
 EXPORT_SYMBOL_GPL(regulator_enable);
 
 /* locks held by regulator_disable() */
-static int _regulator_disable(struct regulator_dev *rdev)
+static int _regulator_disable(struct regulator_dev *rdev,
+		struct regulator_dev **supply_rdev_ptr)
 {
 	int ret = 0;
 
@@ -1376,8 +1384,7 @@ static int _regulator_disable(struct regulator_dev *rdev)
 		}
 
 		/* decrease our supplies ref count and disable if required */
-		if (rdev->supply)
-			_regulator_disable(rdev->supply);
+		*supply_rdev_ptr = rdev->supply;
 
 		rdev->use_count = 0;
 	} else if (rdev->use_count > 1) {
@@ -1407,17 +1414,29 @@ static int _regulator_disable(struct regulator_dev *rdev)
 int regulator_disable(struct regulator *regulator)
 {
 	struct regulator_dev *rdev = regulator->rdev;
+	struct regulator_dev *supply_rdev = NULL;
 	int ret = 0;
 
 	mutex_lock(&rdev->mutex);
-	ret = _regulator_disable(rdev);
+	ret = _regulator_disable(rdev, &supply_rdev);
 	mutex_unlock(&rdev->mutex);
+
+	/* decrease our supplies ref count and disable if required */
+	while (supply_rdev != NULL) {
+		rdev = supply_rdev;
+
+		mutex_lock(&rdev->mutex);
+		_regulator_disable(rdev, &supply_rdev);
+		mutex_unlock(&rdev->mutex);
+	}
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(regulator_disable);
 
 /* locks held by regulator_force_disable() */
-static int _regulator_force_disable(struct regulator_dev *rdev)
+static int _regulator_force_disable(struct regulator_dev *rdev,
+		struct regulator_dev **supply_rdev_ptr)
 {
 	int ret = 0;
 
@@ -1436,8 +1455,7 @@ static int _regulator_force_disable(struct regulator_dev *rdev)
 	}
 
 	/* decrease our supplies ref count and disable if required */
-	if (rdev->supply)
-		_regulator_disable(rdev->supply);
+	*supply_rdev_ptr = rdev->supply;
 
 	rdev->use_count = 0;
 	return ret;
@@ -1454,12 +1472,17 @@ static int _regulator_force_disable(struct regulator_dev *rdev)
  */
 int regulator_force_disable(struct regulator *regulator)
 {
+	struct regulator_dev *supply_rdev = NULL;
 	int ret;
 
 	mutex_lock(&regulator->rdev->mutex);
 	regulator->uA_load = 0;
-	ret = _regulator_force_disable(regulator->rdev);
+	ret = _regulator_force_disable(regulator->rdev, &supply_rdev);
 	mutex_unlock(&regulator->rdev->mutex);
+
+	if (supply_rdev)
+		regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev)));
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(regulator_force_disable);
@@ -2463,6 +2486,22 @@ void regulator_has_full_constraints(void)
 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
 
 /**
+ * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
+ *
+ * Calling this function will cause the regulator API to provide a
+ * dummy regulator to consumers if no physical regulator is found,
+ * allowing most consumers to proceed as though a regulator were
+ * configured.  This allows systems such as those with software
+ * controllable regulators for the CPU core only to be brought up more
+ * readily.
+ */
+void regulator_use_dummy_regulator(void)
+{
+	board_wants_dummy_regulator = true;
+}
+EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
+
+/**
  * rdev_get_drvdata - get rdev regulator driver data
  * @rdev: regulator
  *
diff --git a/drivers/regulator/dummy.h b/drivers/regulator/dummy.h
index 3921c0e..97a11b7 100644
--- a/drivers/regulator/dummy.h
+++ b/drivers/regulator/dummy.h
@@ -22,10 +22,6 @@ struct regulator_dev;
 
 extern struct regulator_dev *dummy_regulator_rdev;
 
-#ifdef CONFIG_REGULATOR_DUMMY
 void __init regulator_dummy_init(void);
-#else
-static inline void regulator_dummy_init(void) { }
-#endif
 
 #endif
diff --git a/drivers/regulator/lp3972.c b/drivers/regulator/lp3972.c
new file mode 100644
index 0000000..e07062f
--- /dev/null
+++ b/drivers/regulator/lp3972.c
@@ -0,0 +1,660 @@
+/*
+ * Regulator driver for National Semiconductors LP3972 PMIC chip
+ *
+ * Based on lp3971.c
+ *
+ * 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.
+ *
+ */
+
+#include <linux/bug.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/lp3972.h>
+#include <linux/slab.h>
+
+struct lp3972 {
+	struct device *dev;
+	struct mutex io_lock;
+	struct i2c_client *i2c;
+	int num_regulators;
+	struct regulator_dev **rdev;
+};
+
+/* LP3972 Control Registers */
+#define LP3972_SCR_REG		0x07
+#define LP3972_OVER1_REG	0x10
+#define LP3972_OVSR1_REG	0x11
+#define LP3972_OVER2_REG	0x12
+#define LP3972_OVSR2_REG	0x13
+#define LP3972_VCC1_REG		0x20
+#define LP3972_ADTV1_REG	0x23
+#define LP3972_ADTV2_REG	0x24
+#define LP3972_AVRC_REG		0x25
+#define LP3972_CDTC1_REG	0x26
+#define LP3972_CDTC2_REG	0x27
+#define LP3972_SDTV1_REG	0x29
+#define LP3972_SDTV2_REG	0x2A
+#define LP3972_MDTV1_REG	0x32
+#define LP3972_MDTV2_REG	0x33
+#define LP3972_L2VCR_REG	0x39
+#define LP3972_L34VCR_REG	0x3A
+#define LP3972_SCR1_REG		0x80
+#define LP3972_SCR2_REG		0x81
+#define LP3972_OEN3_REG		0x82
+#define LP3972_OSR3_REG		0x83
+#define LP3972_LOER4_REG	0x84
+#define LP3972_B2TV_REG		0x85
+#define LP3972_B3TV_REG		0x86
+#define LP3972_B32RC_REG	0x87
+#define LP3972_ISRA_REG		0x88
+#define LP3972_BCCR_REG		0x89
+#define LP3972_II1RR_REG	0x8E
+#define LP3972_II2RR_REG	0x8F
+
+#define LP3972_SYS_CONTROL1_REG		LP3972_SCR1_REG
+/* System control register 1 initial value,
+ * bits 5, 6 and 7 are EPROM programmable */
+#define SYS_CONTROL1_INIT_VAL		0x02
+#define SYS_CONTROL1_INIT_MASK		0x1F
+
+#define LP3972_VOL_CHANGE_REG		LP3972_VCC1_REG
+#define LP3972_VOL_CHANGE_FLAG_GO	0x01
+#define LP3972_VOL_CHANGE_FLAG_MASK	0x03
+
+/* LDO output enable mask */
+#define LP3972_OEN3_L1EN	BIT(0)
+#define LP3972_OVER2_LDO2_EN	BIT(2)
+#define LP3972_OVER2_LDO3_EN	BIT(3)
+#define LP3972_OVER2_LDO4_EN	BIT(4)
+#define LP3972_OVER1_S_EN	BIT(2)
+
+static const int ldo1_voltage_map[] = {
+	1700, 1725, 1750, 1775, 1800, 1825, 1850, 1875,
+	1900, 1925, 1950, 1975, 2000,
+};
+
+static const int ldo23_voltage_map[] = {
+	1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500,
+	2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300,
+};
+
+static const int ldo4_voltage_map[] = {
+	1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350,
+	1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300,
+};
+
+static const int ldo5_voltage_map[] = {
+	   0,    0,    0,    0,    0,  850,  875,  900,
+	 925,  950,  975, 1000, 1025, 1050, 1075, 1100,
+	1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300,
+	1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500,
+};
+
+static const int buck1_voltage_map[] = {
+	 725,  750,  775,  800,  825,  850,  875,  900,
+	 925,  950,  975, 1000, 1025, 1050, 1075, 1100,
+	1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300,
+	1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500,
+};
+
+static const int buck23_voltage_map[] = {
+	   0,  800,  850,  900,  950, 1000, 1050, 1100,
+	1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500,
+	1550, 1600, 1650, 1700, 1800, 1900, 2500, 2800,
+	3000, 3300,
+};
+
+static const int *ldo_voltage_map[] = {
+	ldo1_voltage_map,
+	ldo23_voltage_map,
+	ldo23_voltage_map,
+	ldo4_voltage_map,
+	ldo5_voltage_map,
+};
+
+static const int *buck_voltage_map[] = {
+	buck1_voltage_map,
+	buck23_voltage_map,
+	buck23_voltage_map,
+};
+
+static const int ldo_output_enable_mask[] = {
+	LP3972_OEN3_L1EN,
+	LP3972_OVER2_LDO2_EN,
+	LP3972_OVER2_LDO3_EN,
+	LP3972_OVER2_LDO4_EN,
+	LP3972_OVER1_S_EN,
+};
+
+static const int ldo_output_enable_addr[] = {
+	LP3972_OEN3_REG,
+	LP3972_OVER2_REG,
+	LP3972_OVER2_REG,
+	LP3972_OVER2_REG,
+	LP3972_OVER1_REG,
+};
+
+static const int ldo_vol_ctl_addr[] = {
+	LP3972_MDTV1_REG,
+	LP3972_L2VCR_REG,
+	LP3972_L34VCR_REG,
+	LP3972_L34VCR_REG,
+	LP3972_SDTV1_REG,
+};
+
+static const int buck_vol_enable_addr[] = {
+	LP3972_OVER1_REG,
+	LP3972_OEN3_REG,
+	LP3972_OEN3_REG,
+};
+
+static const int buck_base_addr[] = {
+	LP3972_ADTV1_REG,
+	LP3972_B2TV_REG,
+	LP3972_B3TV_REG,
+};
+
+#define LP3972_LDO_VOL_VALUE_MAP(x) (ldo_voltage_map[x])
+#define LP3972_LDO_OUTPUT_ENABLE_MASK(x) (ldo_output_enable_mask[x])
+#define LP3972_LDO_OUTPUT_ENABLE_REG(x) (ldo_output_enable_addr[x])
+
+/*	LDO voltage control registers shift:
+	LP3972_LDO1 -> 0, LP3972_LDO2 -> 4
+	LP3972_LDO3 -> 0, LP3972_LDO4 -> 4
+	LP3972_LDO5 -> 0
+*/
+#define LP3972_LDO_VOL_CONTR_SHIFT(x) (((x) & 1) << 2)
+#define LP3972_LDO_VOL_CONTR_REG(x) (ldo_vol_ctl_addr[x])
+#define LP3972_LDO_VOL_CHANGE_SHIFT(x) ((x) ? 4 : 6)
+
+#define LP3972_LDO_VOL_MASK(x) (((x) % 4) ? 0x0f : 0x1f)
+#define LP3972_LDO_VOL_MIN_IDX(x) (((x) == 4) ? 0x05 : 0x00)
+#define LP3972_LDO_VOL_MAX_IDX(x) ((x) ? (((x) == 4) ? 0x1f : 0x0f) : 0x0c)
+
+#define LP3972_BUCK_VOL_VALUE_MAP(x) (buck_voltage_map[x])
+#define LP3972_BUCK_VOL_ENABLE_REG(x) (buck_vol_enable_addr[x])
+#define LP3972_BUCK_VOL1_REG(x) (buck_base_addr[x])
+#define LP3972_BUCK_VOL_MASK 0x1f
+#define LP3972_BUCK_VOL_MIN_IDX(x) ((x) ? 0x01 : 0x00)
+#define LP3972_BUCK_VOL_MAX_IDX(x) ((x) ? 0x19 : 0x1f)
+
+static int lp3972_i2c_read(struct i2c_client *i2c, char reg, int count,
+	u16 *dest)
+{
+	int ret;
+
+	if (count != 1)
+		return -EIO;
+	ret = i2c_smbus_read_byte_data(i2c, reg);
+	if (ret < 0)
+		return ret;
+
+	*dest = ret;
+	return 0;
+}
+
+static int lp3972_i2c_write(struct i2c_client *i2c, char reg, int count,
+	const u16 *src)
+{
+	if (count != 1)
+		return -EIO;
+	return i2c_smbus_write_byte_data(i2c, reg, *src);
+}
+
+static u8 lp3972_reg_read(struct lp3972 *lp3972, u8 reg)
+{
+	u16 val = 0;
+
+	mutex_lock(&lp3972->io_lock);
+
+	lp3972_i2c_read(lp3972->i2c, reg, 1, &val);
+
+	dev_dbg(lp3972->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
+		(unsigned)val & 0xff);
+
+	mutex_unlock(&lp3972->io_lock);
+
+	return val & 0xff;
+}
+
+static int lp3972_set_bits(struct lp3972 *lp3972, u8 reg, u16 mask, u16 val)
+{
+	u16 tmp;
+	int ret;
+
+	mutex_lock(&lp3972->io_lock);
+
+	ret = lp3972_i2c_read(lp3972->i2c, reg, 1, &tmp);
+	tmp = (tmp & ~mask) | val;
+	if (ret == 0) {
+		ret = lp3972_i2c_write(lp3972->i2c, reg, 1, &tmp);
+		dev_dbg(lp3972->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
+			(unsigned)val & 0xff);
+	}
+	mutex_unlock(&lp3972->io_lock);
+
+	return ret;
+}
+
+static int lp3972_ldo_list_voltage(struct regulator_dev *dev, unsigned index)
+{
+	int ldo = rdev_get_id(dev) - LP3972_LDO1;
+	return 1000 * LP3972_LDO_VOL_VALUE_MAP(ldo)[index];
+}
+
+static int lp3972_ldo_is_enabled(struct regulator_dev *dev)
+{
+	struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev) - LP3972_LDO1;
+	u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo);
+	u16 val;
+
+	val = lp3972_reg_read(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo));
+	return !!(val & mask);
+}
+
+static int lp3972_ldo_enable(struct regulator_dev *dev)
+{
+	struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev) - LP3972_LDO1;
+	u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo);
+
+	return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo),
+				mask, mask);
+}
+
+static int lp3972_ldo_disable(struct regulator_dev *dev)
+{
+	struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev) - LP3972_LDO1;
+	u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo);
+
+	return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo),
+				mask, 0);
+}
+
+static int lp3972_ldo_get_voltage(struct regulator_dev *dev)
+{
+	struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev) - LP3972_LDO1;
+	u16 mask = LP3972_LDO_VOL_MASK(ldo);
+	u16 val, reg;
+
+	reg = lp3972_reg_read(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo));
+	val = (reg >> LP3972_LDO_VOL_CONTR_SHIFT(ldo)) & mask;
+
+	return 1000 * LP3972_LDO_VOL_VALUE_MAP(ldo)[val];
+}
+
+static int lp3972_ldo_set_voltage(struct regulator_dev *dev,
+				  int min_uV, int max_uV)
+{
+	struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev) - LP3972_LDO1;
+	int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
+	const int *vol_map = LP3972_LDO_VOL_VALUE_MAP(ldo);
+	u16 val;
+	int shift, ret;
+
+	if (min_vol < vol_map[LP3972_LDO_VOL_MIN_IDX(ldo)] ||
+	    min_vol > vol_map[LP3972_LDO_VOL_MAX_IDX(ldo)])
+		return -EINVAL;
+
+	for (val = LP3972_LDO_VOL_MIN_IDX(ldo);
+		val <= LP3972_LDO_VOL_MAX_IDX(ldo); val++)
+		if (vol_map[val] >= min_vol)
+			break;
+
+	if (val > LP3972_LDO_VOL_MAX_IDX(ldo) || vol_map[val] > max_vol)
+		return -EINVAL;
+
+	shift = LP3972_LDO_VOL_CONTR_SHIFT(ldo);
+	ret = lp3972_set_bits(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo),
+		LP3972_LDO_VOL_MASK(ldo) << shift, val << shift);
+
+	if (ret)
+		return ret;
+
+	/*
+	 * LDO1 and LDO5 support voltage control by either target voltage1
+	 * or target voltage2 register.
+	 * We use target voltage1 register for LDO1 and LDO5 in this driver.
+	 * We need to update voltage change control register(0x20) to enable
+	 * LDO1 and LDO5 to change to their programmed target values.
+	 */
+	switch (ldo) {
+	case LP3972_LDO1:
+	case LP3972_LDO5:
+		shift = LP3972_LDO_VOL_CHANGE_SHIFT(ldo);
+		ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
+			LP3972_VOL_CHANGE_FLAG_MASK << shift,
+			LP3972_VOL_CHANGE_FLAG_GO << shift);
+		if (ret)
+			return ret;
+
+		ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
+			LP3972_VOL_CHANGE_FLAG_MASK << shift, 0);
+		break;
+	}
+
+	return ret;
+}
+
+static struct regulator_ops lp3972_ldo_ops = {
+	.list_voltage = lp3972_ldo_list_voltage,
+	.is_enabled = lp3972_ldo_is_enabled,
+	.enable = lp3972_ldo_enable,
+	.disable = lp3972_ldo_disable,
+	.get_voltage = lp3972_ldo_get_voltage,
+	.set_voltage = lp3972_ldo_set_voltage,
+};
+
+static int lp3972_dcdc_list_voltage(struct regulator_dev *dev, unsigned index)
+{
+	int buck = rdev_get_id(dev) - LP3972_DCDC1;
+	return 1000 * buck_voltage_map[buck][index];
+}
+
+static int lp3972_dcdc_is_enabled(struct regulator_dev *dev)
+{
+	struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+	int buck = rdev_get_id(dev) - LP3972_DCDC1;
+	u16 mask = 1 << (buck * 2);
+	u16 val;
+
+	val = lp3972_reg_read(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck));
+	return !!(val & mask);
+}
+
+static int lp3972_dcdc_enable(struct regulator_dev *dev)
+{
+	struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+	int buck = rdev_get_id(dev) - LP3972_DCDC1;
+	u16 mask = 1 << (buck * 2);
+	u16 val;
+
+	val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck),
+				mask, mask);
+	return val;
+}
+
+static int lp3972_dcdc_disable(struct regulator_dev *dev)
+{
+	struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+	int buck = rdev_get_id(dev) - LP3972_DCDC1;
+	u16 mask = 1 << (buck * 2);
+	u16 val;
+
+	val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck),
+				mask, 0);
+	return val;
+}
+
+static int lp3972_dcdc_get_voltage(struct regulator_dev *dev)
+{
+	struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+	int buck = rdev_get_id(dev) - LP3972_DCDC1;
+	u16 reg;
+	int val;
+
+	reg = lp3972_reg_read(lp3972, LP3972_BUCK_VOL1_REG(buck));
+	reg &= LP3972_BUCK_VOL_MASK;
+	if (reg <= LP3972_BUCK_VOL_MAX_IDX(buck))
+		val = 1000 * buck_voltage_map[buck][reg];
+	else {
+		val = 0;
+		dev_warn(&dev->dev, "chip reported incorrect voltage value."
+				    " reg = %d\n", reg);
+	}
+
+	return val;
+}
+
+static int lp3972_dcdc_set_voltage(struct regulator_dev *dev,
+				  int min_uV, int max_uV)
+{
+	struct lp3972 *lp3972 = rdev_get_drvdata(dev);
+	int buck = rdev_get_id(dev) - LP3972_DCDC1;
+	int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
+	const int *vol_map = buck_voltage_map[buck];
+	u16 val;
+	int ret;
+
+	if (min_vol < vol_map[LP3972_BUCK_VOL_MIN_IDX(buck)] ||
+	    min_vol > vol_map[LP3972_BUCK_VOL_MAX_IDX(buck)])
+		return -EINVAL;
+
+	for (val = LP3972_BUCK_VOL_MIN_IDX(buck);
+		val <= LP3972_BUCK_VOL_MAX_IDX(buck); val++)
+		if (vol_map[val] >= min_vol)
+			break;
+
+	if (val > LP3972_BUCK_VOL_MAX_IDX(buck) ||
+	    vol_map[val] > max_vol)
+		return -EINVAL;
+
+	ret = lp3972_set_bits(lp3972, LP3972_BUCK_VOL1_REG(buck),
+				LP3972_BUCK_VOL_MASK, val);
+	if (ret)
+		return ret;
+
+	if (buck != 0)
+		return ret;
+
+	ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
+		LP3972_VOL_CHANGE_FLAG_MASK, LP3972_VOL_CHANGE_FLAG_GO);
+	if (ret)
+		return ret;
+
+	return lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
+				LP3972_VOL_CHANGE_FLAG_MASK, 0);
+}
+
+static struct regulator_ops lp3972_dcdc_ops = {
+	.list_voltage = lp3972_dcdc_list_voltage,
+	.is_enabled = lp3972_dcdc_is_enabled,
+	.enable = lp3972_dcdc_enable,
+	.disable = lp3972_dcdc_disable,
+	.get_voltage = lp3972_dcdc_get_voltage,
+	.set_voltage = lp3972_dcdc_set_voltage,
+};
+
+static struct regulator_desc regulators[] = {
+	{
+		.name = "LDO1",
+		.id = LP3972_LDO1,
+		.ops = &lp3972_ldo_ops,
+		.n_voltages = ARRAY_SIZE(ldo1_voltage_map),
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO2",
+		.id = LP3972_LDO2,
+		.ops = &lp3972_ldo_ops,
+		.n_voltages = ARRAY_SIZE(ldo23_voltage_map),
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO3",
+		.id = LP3972_LDO3,
+		.ops = &lp3972_ldo_ops,
+		.n_voltages = ARRAY_SIZE(ldo23_voltage_map),
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO4",
+		.id = LP3972_LDO4,
+		.ops = &lp3972_ldo_ops,
+		.n_voltages = ARRAY_SIZE(ldo4_voltage_map),
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO5",
+		.id = LP3972_LDO5,
+		.ops = &lp3972_ldo_ops,
+		.n_voltages = ARRAY_SIZE(ldo5_voltage_map),
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "DCDC1",
+		.id = LP3972_DCDC1,
+		.ops = &lp3972_dcdc_ops,
+		.n_voltages = ARRAY_SIZE(buck1_voltage_map),
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "DCDC2",
+		.id = LP3972_DCDC2,
+		.ops = &lp3972_dcdc_ops,
+		.n_voltages = ARRAY_SIZE(buck23_voltage_map),
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "DCDC3",
+		.id = LP3972_DCDC3,
+		.ops = &lp3972_dcdc_ops,
+		.n_voltages = ARRAY_SIZE(buck23_voltage_map),
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __devinit setup_regulators(struct lp3972 *lp3972,
+	struct lp3972_platform_data *pdata)
+{
+	int i, err;
+
+	lp3972->num_regulators = pdata->num_regulators;
+	lp3972->rdev = kcalloc(pdata->num_regulators,
+				sizeof(struct regulator_dev *), GFP_KERNEL);
+	if (!lp3972->rdev) {
+		err = -ENOMEM;
+		goto err_nomem;
+	}
+
+	/* Instantiate the regulators */
+	for (i = 0; i < pdata->num_regulators; i++) {
+		struct lp3972_regulator_subdev *reg = &pdata->regulators[i];
+		lp3972->rdev[i] = regulator_register(&regulators[reg->id],
+					lp3972->dev, reg->initdata, lp3972);
+
+		if (IS_ERR(lp3972->rdev[i])) {
+			err = PTR_ERR(lp3972->rdev[i]);
+			dev_err(lp3972->dev, "regulator init failed: %d\n",
+				err);
+			goto error;
+		}
+	}
+
+	return 0;
+error:
+	while (--i >= 0)
+		regulator_unregister(lp3972->rdev[i]);
+	kfree(lp3972->rdev);
+	lp3972->rdev = NULL;
+err_nomem:
+	return err;
+}
+
+static int __devinit lp3972_i2c_probe(struct i2c_client *i2c,
+			    const struct i2c_device_id *id)
+{
+	struct lp3972 *lp3972;
+	struct lp3972_platform_data *pdata = i2c->dev.platform_data;
+	int ret;
+	u16 val;
+
+	if (!pdata) {
+		dev_dbg(&i2c->dev, "No platform init data supplied\n");
+		return -ENODEV;
+	}
+
+	lp3972 = kzalloc(sizeof(struct lp3972), GFP_KERNEL);
+	if (!lp3972)
+		return -ENOMEM;
+
+	lp3972->i2c = i2c;
+	lp3972->dev = &i2c->dev;
+
+	mutex_init(&lp3972->io_lock);
+
+	/* Detect LP3972 */
+	ret = lp3972_i2c_read(i2c, LP3972_SYS_CONTROL1_REG, 1, &val);
+	if (ret == 0 &&
+		(val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) {
+		ret = -ENODEV;
+		dev_err(&i2c->dev, "chip reported: val = 0x%x\n", val);
+	}
+	if (ret < 0) {
+		dev_err(&i2c->dev, "failed to detect device. ret = %d\n", ret);
+		goto err_detect;
+	}
+
+	ret = setup_regulators(lp3972, pdata);
+	if (ret < 0)
+		goto err_detect;
+
+	i2c_set_clientdata(i2c, lp3972);
+	return 0;
+
+err_detect:
+	kfree(lp3972);
+	return ret;
+}
+
+static int __devexit lp3972_i2c_remove(struct i2c_client *i2c)
+{
+	struct lp3972 *lp3972 = i2c_get_clientdata(i2c);
+	int i;
+
+	for (i = 0; i < lp3972->num_regulators; i++)
+		regulator_unregister(lp3972->rdev[i]);
+	kfree(lp3972->rdev);
+	kfree(lp3972);
+
+	return 0;
+}
+
+static const struct i2c_device_id lp3972_i2c_id[] = {
+	{ "lp3972", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lp3972_i2c_id);
+
+static struct i2c_driver lp3972_i2c_driver = {
+	.driver = {
+		.name = "lp3972",
+		.owner = THIS_MODULE,
+	},
+	.probe    = lp3972_i2c_probe,
+	.remove   = __devexit_p(lp3972_i2c_remove),
+	.id_table = lp3972_i2c_id,
+};
+
+static int __init lp3972_module_init(void)
+{
+	return i2c_add_driver(&lp3972_i2c_driver);
+}
+subsys_initcall(lp3972_module_init);
+
+static void __exit lp3972_module_exit(void)
+{
+	i2c_del_driver(&lp3972_i2c_driver);
+}
+module_exit(lp3972_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Axel Lin <axel.lin@gmail.com>");
+MODULE_DESCRIPTION("LP3972 PMIC driver");
diff --git a/drivers/regulator/max8952.c b/drivers/regulator/max8952.c
new file mode 100644
index 0000000..0d5dda4
--- /dev/null
+++ b/drivers/regulator/max8952.c
@@ -0,0 +1,366 @@
+/*
+ * max8952.c - Voltage and current regulation for the Maxim 8952
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ * MyungJoo Ham <myungjoo.ham@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/max8952.h>
+#include <linux/mutex.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+/* Registers */
+enum {
+	MAX8952_REG_MODE0,
+	MAX8952_REG_MODE1,
+	MAX8952_REG_MODE2,
+	MAX8952_REG_MODE3,
+	MAX8952_REG_CONTROL,
+	MAX8952_REG_SYNC,
+	MAX8952_REG_RAMP,
+	MAX8952_REG_CHIP_ID1,
+	MAX8952_REG_CHIP_ID2,
+};
+
+struct max8952_data {
+	struct i2c_client	*client;
+	struct device		*dev;
+	struct mutex		mutex;
+	struct max8952_platform_data *pdata;
+	struct regulator_dev	*rdev;
+
+	bool vid0;
+	bool vid1;
+	bool en;
+};
+
+static int max8952_read_reg(struct max8952_data *max8952, u8 reg)
+{
+	int ret = i2c_smbus_read_byte_data(max8952->client, reg);
+	if (ret > 0)
+		ret &= 0xff;
+
+	return ret;
+}
+
+static int max8952_write_reg(struct max8952_data *max8952,
+		u8 reg, u8 value)
+{
+	return i2c_smbus_write_byte_data(max8952->client, reg, value);
+}
+
+static int max8952_voltage(struct max8952_data *max8952, u8 mode)
+{
+	return (max8952->pdata->dvs_mode[mode] * 10 + 770) * 1000;
+}
+
+static int max8952_list_voltage(struct regulator_dev *rdev,
+		unsigned int selector)
+{
+	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+
+	if (rdev_get_id(rdev) != 0)
+		return -EINVAL;
+
+	return max8952_voltage(max8952, selector);
+}
+
+static int max8952_is_enabled(struct regulator_dev *rdev)
+{
+	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+	return max8952->en;
+}
+
+static int max8952_enable(struct regulator_dev *rdev)
+{
+	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+
+	/* If not valid, assume "ALWAYS_HIGH" */
+	if (gpio_is_valid(max8952->pdata->gpio_en))
+		gpio_set_value(max8952->pdata->gpio_en, 1);
+
+	max8952->en = true;
+	return 0;
+}
+
+static int max8952_disable(struct regulator_dev *rdev)
+{
+	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+
+	/* If not valid, assume "ALWAYS_HIGH" -> not permitted */
+	if (gpio_is_valid(max8952->pdata->gpio_en))
+		gpio_set_value(max8952->pdata->gpio_en, 0);
+	else
+		return -EPERM;
+
+	max8952->en = false;
+	return 0;
+}
+
+static int max8952_get_voltage(struct regulator_dev *rdev)
+{
+	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+	u8 vid = 0;
+
+	if (max8952->vid0)
+		vid += 1;
+	if (max8952->vid1)
+		vid += 2;
+
+	return max8952_voltage(max8952, vid);
+}
+
+static int max8952_set_voltage(struct regulator_dev *rdev,
+				int min_uV, int max_uV)
+{
+	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
+	s8 vid = -1, i;
+
+	if (!gpio_is_valid(max8952->pdata->gpio_vid0) ||
+			!gpio_is_valid(max8952->pdata->gpio_vid0)) {
+		/* DVS not supported */
+		return -EPERM;
+	}
+
+	for (i = 0; i < MAX8952_NUM_DVS_MODE; i++) {
+		int volt = max8952_voltage(max8952, i);
+
+		/* Set the voltage as low as possible within the range */
+		if (volt <= max_uV && volt >= min_uV)
+			if (vid == -1 || max8952_voltage(max8952, vid) > volt)
+				vid = i;
+	}
+
+	if (vid >= 0 && vid < MAX8952_NUM_DVS_MODE) {
+		max8952->vid0 = (vid % 2 == 1);
+		max8952->vid1 = (((vid >> 1) % 2) == 1);
+		gpio_set_value(max8952->pdata->gpio_vid0, max8952->vid0);
+		gpio_set_value(max8952->pdata->gpio_vid1, max8952->vid1);
+	} else
+		return -EINVAL;
+
+	return 0;
+}
+
+static struct regulator_ops max8952_ops = {
+	.list_voltage		= max8952_list_voltage,
+	.is_enabled		= max8952_is_enabled,
+	.enable			= max8952_enable,
+	.disable		= max8952_disable,
+	.get_voltage		= max8952_get_voltage,
+	.set_voltage		= max8952_set_voltage,
+	.set_suspend_disable	= max8952_disable,
+};
+
+static struct regulator_desc regulator = {
+	.name		= "MAX8952_VOUT",
+	.id		= 0,
+	.n_voltages	= MAX8952_NUM_DVS_MODE,
+	.ops		= &max8952_ops,
+	.type		= REGULATOR_VOLTAGE,
+	.owner		= THIS_MODULE,
+};
+
+static int __devinit max8952_pmic_probe(struct i2c_client *client,
+		const struct i2c_device_id *i2c_id)
+{
+	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+	struct max8952_platform_data *pdata = client->dev.platform_data;
+	struct max8952_data *max8952;
+
+	int ret = 0, err = 0;
+
+	if (!pdata) {
+		dev_err(&client->dev, "Require the platform data\n");
+		return -EINVAL;
+	}
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
+		return -EIO;
+
+	max8952 = kzalloc(sizeof(struct max8952_data), GFP_KERNEL);
+	if (!max8952)
+		return -ENOMEM;
+
+	max8952->client = client;
+	max8952->dev = &client->dev;
+	max8952->pdata = pdata;
+	mutex_init(&max8952->mutex);
+
+	max8952->rdev = regulator_register(&regulator, max8952->dev,
+			&pdata->reg_data, max8952);
+
+	if (IS_ERR(max8952->rdev)) {
+		ret = PTR_ERR(max8952->rdev);
+		dev_err(max8952->dev, "regulator init failed (%d)\n", ret);
+		goto err_reg;
+	}
+
+	max8952->en = !!(pdata->reg_data.constraints.boot_on);
+	max8952->vid0 = (pdata->default_mode % 2) == 1;
+	max8952->vid1 = ((pdata->default_mode >> 1) % 2) == 1;
+
+	if (gpio_is_valid(pdata->gpio_en)) {
+		if (!gpio_request(pdata->gpio_en, "MAX8952 EN"))
+			gpio_direction_output(pdata->gpio_en, max8952->en);
+		else
+			err = 1;
+	} else
+		err = 2;
+
+	if (err) {
+		dev_info(max8952->dev, "EN gpio invalid: assume that EN"
+				"is always High\n");
+		max8952->en = 1;
+		pdata->gpio_en = -1; /* Mark invalid */
+	}
+
+	err = 0;
+
+	if (gpio_is_valid(pdata->gpio_vid0) &&
+			gpio_is_valid(pdata->gpio_vid1)) {
+		if (!gpio_request(pdata->gpio_vid0, "MAX8952 VID0"))
+			gpio_direction_output(pdata->gpio_vid0,
+					(pdata->default_mode) % 2);
+		else
+			err = 1;
+
+		if (!gpio_request(pdata->gpio_vid1, "MAX8952 VID1"))
+			gpio_direction_output(pdata->gpio_vid1,
+				(pdata->default_mode >> 1) % 2);
+		else {
+			if (!err)
+				gpio_free(pdata->gpio_vid0);
+			err = 2;
+		}
+
+	} else
+		err = 3;
+
+	if (err) {
+		dev_warn(max8952->dev, "VID0/1 gpio invalid: "
+				"DVS not avilable.\n");
+		max8952->vid0 = 0;
+		max8952->vid1 = 0;
+		/* Mark invalid */
+		pdata->gpio_vid0 = -1;
+		pdata->gpio_vid1 = -1;
+
+		/* Disable Pulldown of EN only */
+		max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x60);
+
+		dev_err(max8952->dev, "DVS modes disabled because VID0 and VID1"
+				" do not have proper controls.\n");
+	} else {
+		/*
+		 * Disable Pulldown on EN, VID0, VID1 to reduce
+		 * leakage current of MAX8952 assuming that MAX8952
+		 * is turned on (EN==1). Note that without having VID0/1
+		 * properly connected, turning pulldown off can be
+		 * problematic. Thus, turn this off only when they are
+		 * controllable by GPIO.
+		 */
+		max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x0);
+	}
+
+	max8952_write_reg(max8952, MAX8952_REG_MODE0,
+			(max8952_read_reg(max8952,
+					  MAX8952_REG_MODE0) & 0xC0) |
+			(pdata->dvs_mode[0] & 0x3F));
+	max8952_write_reg(max8952, MAX8952_REG_MODE1,
+			(max8952_read_reg(max8952,
+					  MAX8952_REG_MODE1) & 0xC0) |
+			(pdata->dvs_mode[1] & 0x3F));
+	max8952_write_reg(max8952, MAX8952_REG_MODE2,
+			(max8952_read_reg(max8952,
+					  MAX8952_REG_MODE2) & 0xC0) |
+			(pdata->dvs_mode[2] & 0x3F));
+	max8952_write_reg(max8952, MAX8952_REG_MODE3,
+			(max8952_read_reg(max8952,
+					  MAX8952_REG_MODE3) & 0xC0) |
+			(pdata->dvs_mode[3] & 0x3F));
+
+	max8952_write_reg(max8952, MAX8952_REG_SYNC,
+			(max8952_read_reg(max8952, MAX8952_REG_SYNC) & 0x3F) |
+			((pdata->sync_freq & 0x3) << 6));
+	max8952_write_reg(max8952, MAX8952_REG_RAMP,
+			(max8952_read_reg(max8952, MAX8952_REG_RAMP) & 0x1F) |
+			((pdata->ramp_speed & 0x7) << 5));
+
+	i2c_set_clientdata(client, max8952);
+
+	return 0;
+
+err_reg:
+	kfree(max8952);
+	return ret;
+}
+
+static int __devexit max8952_pmic_remove(struct i2c_client *client)
+{
+	struct max8952_data *max8952 = i2c_get_clientdata(client);
+	struct max8952_platform_data *pdata = max8952->pdata;
+	struct regulator_dev *rdev = max8952->rdev;
+
+	regulator_unregister(rdev);
+
+	gpio_free(pdata->gpio_vid0);
+	gpio_free(pdata->gpio_vid1);
+	gpio_free(pdata->gpio_en);
+
+	kfree(max8952);
+	return 0;
+}
+
+static const struct i2c_device_id max8952_ids[] = {
+	{ "max8952", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, max8952_ids);
+
+static struct i2c_driver max8952_pmic_driver = {
+	.probe		= max8952_pmic_probe,
+	.remove		= __devexit_p(max8952_pmic_remove),
+	.driver		= {
+		.name	= "max8952",
+	},
+	.id_table	= max8952_ids,
+};
+
+static int __init max8952_pmic_init(void)
+{
+	return i2c_add_driver(&max8952_pmic_driver);
+}
+subsys_initcall(max8952_pmic_init);
+
+static void __exit max8952_pmic_exit(void)
+{
+	i2c_del_driver(&max8952_pmic_driver);
+}
+module_exit(max8952_pmic_exit);
+
+MODULE_DESCRIPTION("MAXIM 8952 voltage regulator driver");
+MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/regulator/lp3972.h b/include/linux/regulator/lp3972.h
new file mode 100644
index 0000000..9bb7389
--- /dev/null
+++ b/include/linux/regulator/lp3972.h
@@ -0,0 +1,48 @@
+/*
+ * National Semiconductors LP3972 PMIC chip client interface
+ *
+ * Based on lp3971.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __LINUX_REGULATOR_LP3972_H
+#define __LINUX_REGULATOR_LP3972_H
+
+#include <linux/regulator/machine.h>
+
+#define LP3972_LDO1  0
+#define LP3972_LDO2  1
+#define LP3972_LDO3  2
+#define LP3972_LDO4  3
+#define LP3972_LDO5  4
+
+#define LP3972_DCDC1 5
+#define LP3972_DCDC2 6
+#define LP3972_DCDC3 7
+
+#define LP3972_NUM_REGULATORS 8
+
+struct lp3972_regulator_subdev {
+	int id;
+	struct regulator_init_data *initdata;
+};
+
+struct lp3972_platform_data {
+	int num_regulators;
+	struct lp3972_regulator_subdev *regulators;
+};
+
+#endif
diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index e298028..761c745 100644
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -189,10 +189,15 @@ int regulator_suspend_prepare(suspend_state_t state);
 
 #ifdef CONFIG_REGULATOR
 void regulator_has_full_constraints(void);
+void regulator_use_dummy_regulator(void);
 #else
 static inline void regulator_has_full_constraints(void)
 {
 }
+
+static inline void regulator_use_dummy_regulator(void)
+{
+}
 #endif
 
 #endif
diff --git a/include/linux/regulator/max8952.h b/include/linux/regulator/max8952.h
new file mode 100644
index 0000000..45e4285
--- /dev/null
+++ b/include/linux/regulator/max8952.h
@@ -0,0 +1,135 @@
+/*
+ * max8952.h - Voltage regulation for the Maxim 8952
+ *
+ *  Copyright (C) 2010 Samsung Electrnoics
+ *  MyungJoo Ham <myungjoo.ham@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef REGULATOR_MAX8952
+#define REGULATOR_MAX8952
+
+#include <linux/regulator/machine.h>
+
+enum {
+	MAX8952_DVS_MODE0,
+	MAX8952_DVS_MODE1,
+	MAX8952_DVS_MODE2,
+	MAX8952_DVS_MODE3,
+};
+
+enum {
+	MAX8952_DVS_770mV = 0,
+	MAX8952_DVS_780mV,
+	MAX8952_DVS_790mV,
+	MAX8952_DVS_800mV,
+	MAX8952_DVS_810mV,
+	MAX8952_DVS_820mV,
+	MAX8952_DVS_830mV,
+	MAX8952_DVS_840mV,
+	MAX8952_DVS_850mV,
+	MAX8952_DVS_860mV,
+	MAX8952_DVS_870mV,
+	MAX8952_DVS_880mV,
+	MAX8952_DVS_890mV,
+	MAX8952_DVS_900mV,
+	MAX8952_DVS_910mV,
+	MAX8952_DVS_920mV,
+	MAX8952_DVS_930mV,
+	MAX8952_DVS_940mV,
+	MAX8952_DVS_950mV,
+	MAX8952_DVS_960mV,
+	MAX8952_DVS_970mV,
+	MAX8952_DVS_980mV,
+	MAX8952_DVS_990mV,
+	MAX8952_DVS_1000mV,
+	MAX8952_DVS_1010mV,
+	MAX8952_DVS_1020mV,
+	MAX8952_DVS_1030mV,
+	MAX8952_DVS_1040mV,
+	MAX8952_DVS_1050mV,
+	MAX8952_DVS_1060mV,
+	MAX8952_DVS_1070mV,
+	MAX8952_DVS_1080mV,
+	MAX8952_DVS_1090mV,
+	MAX8952_DVS_1100mV,
+	MAX8952_DVS_1110mV,
+	MAX8952_DVS_1120mV,
+	MAX8952_DVS_1130mV,
+	MAX8952_DVS_1140mV,
+	MAX8952_DVS_1150mV,
+	MAX8952_DVS_1160mV,
+	MAX8952_DVS_1170mV,
+	MAX8952_DVS_1180mV,
+	MAX8952_DVS_1190mV,
+	MAX8952_DVS_1200mV,
+	MAX8952_DVS_1210mV,
+	MAX8952_DVS_1220mV,
+	MAX8952_DVS_1230mV,
+	MAX8952_DVS_1240mV,
+	MAX8952_DVS_1250mV,
+	MAX8952_DVS_1260mV,
+	MAX8952_DVS_1270mV,
+	MAX8952_DVS_1280mV,
+	MAX8952_DVS_1290mV,
+	MAX8952_DVS_1300mV,
+	MAX8952_DVS_1310mV,
+	MAX8952_DVS_1320mV,
+	MAX8952_DVS_1330mV,
+	MAX8952_DVS_1340mV,
+	MAX8952_DVS_1350mV,
+	MAX8952_DVS_1360mV,
+	MAX8952_DVS_1370mV,
+	MAX8952_DVS_1380mV,
+	MAX8952_DVS_1390mV,
+	MAX8952_DVS_1400mV,
+};
+
+enum {
+	MAX8952_SYNC_FREQ_26MHZ, /* Default */
+	MAX8952_SYNC_FREQ_13MHZ,
+	MAX8952_SYNC_FREQ_19_2MHZ,
+};
+
+enum {
+	MAX8952_RAMP_32mV_us = 0, /* Default */
+	MAX8952_RAMP_16mV_us,
+	MAX8952_RAMP_8mV_us,
+	MAX8952_RAMP_4mV_us,
+	MAX8952_RAMP_2mV_us,
+	MAX8952_RAMP_1mV_us,
+	MAX8952_RAMP_0_5mV_us,
+	MAX8952_RAMP_0_25mV_us,
+};
+
+#define MAX8952_NUM_DVS_MODE	4
+
+struct max8952_platform_data {
+	int gpio_vid0;
+	int gpio_vid1;
+	int gpio_en;
+
+	u8 default_mode;
+	u8 dvs_mode[MAX8952_NUM_DVS_MODE]; /* MAX8952_DVS_MODEx_XXXXmV */
+
+	u8 sync_freq;
+	u8 ramp_speed;
+
+	struct regulator_init_data reg_data;
+};
+
+
+#endif /* REGULATOR_MAX8952 */