Merge tag 'regulator-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator

Pull regulator updates from Mark Brown:
 "The major thing here is the addition of some helpers to factor code
  out of drivers, making a fair proportion of regulators much more just
  data rather than code which is nice.

  - Helpers in the core for regulators using regmap, providing generic
    implementations of the enable and voltage selection operations which
    just need data to describe them in the drivers.
  - Split out voltage mapping and voltage setting, allowing many more
    drivers to take advantage of the infrastructure for selectors.
  - Loads and loads of cleanups from Axel Lin once again, including many
    changes to take advantage of the above new framework features
  - New drivers for Ricoh RC5T583, TI TPS62362, TI TPS62363, TI
    TPS65913, TI TWL6035 and TI TWL6037.

  Some of the registration changes to support the core refactoring
  caused so many conflicts that eventually topic branches were abandoned
  for this release."

* tag 'regulator-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator: (227 commits)
  regulator: tps65910: use of_node of matched regulator being register
  regulator: tps65910: dt: support when "regulators" node found
  regulator: tps65910: add error message in case of failure
  regulator: tps62360: dt: initialize of_node param for regulator register.
  regulator: tps65910: use devm_* for memory allocation
  regulator: tps65910: use small letter for regulator names
  mfd: tpx6586x:  Depend on regulator
  regulator: regulator for Palmas Kconfig
  regulator: regulator driver for Palmas series chips
  regulator: Enable Device Tree for the db8500-prcmu regulator driver
  regulator: db8500-prcmu: Separate regulator registration from probe
  regulator: ab3100: Use regulator_map_voltage_iterate()
  regulator: tps65217: Convert to set_voltage_sel and map_voltage
  regulator: Enable the ab8500 for Device Tree
  regulator: ab8500: Split up probe() into manageable pieces
  regulator: max8925: Remove check_range function and max_uV from struct rc5t583_regulator_info
  regulator: max8649: Remove unused check_range() function
  regulator: rc5t583: Remove max_uV from struct rc5t583_regulator_info
  regulator: da9052: Convert to set_voltage_sel and map_voltage
  regulator: max8952: Use devm_kzalloc
  ...

1 files changed, 158 insertions, 184 deletions

diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c
index 17a58c5..704cd49 100644
--- a/drivers/regulator/max8997.c
+++ b/drivers/regulator/max8997.c
@@ -22,7 +22,6 @@
  */
 
 #include <linux/bug.h>
-#include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
 #include <linux/slab.h>
@@ -68,29 +67,28 @@ struct voltage_map_desc {
 	int min;
 	int max;
 	int step;
-	unsigned int n_bits;
 };
 
 /* Voltage maps in mV */
 static const struct voltage_map_desc ldo_voltage_map_desc = {
-	.min = 800,	.max = 3950,	.step = 50,	.n_bits = 6,
+	.min = 800,	.max = 3950,	.step = 50,
 }; /* LDO1 ~ 18, 21 all */
 
 static const struct voltage_map_desc buck1245_voltage_map_desc = {
-	.min = 650,	.max = 2225,	.step = 25,	.n_bits = 6,
+	.min = 650,	.max = 2225,	.step = 25,
 }; /* Buck1, 2, 4, 5 */
 
 static const struct voltage_map_desc buck37_voltage_map_desc = {
-	.min = 750,	.max = 3900,	.step = 50,	.n_bits = 6,
+	.min = 750,	.max = 3900,	.step = 50,
 }; /* Buck3, 7 */
 
 /* current map in mA */
 static const struct voltage_map_desc charger_current_map_desc = {
-	.min = 200,	.max = 950,	.step = 50,	.n_bits = 4,
+	.min = 200,	.max = 950,	.step = 50,
 };
 
 static const struct voltage_map_desc topoff_current_map_desc = {
-	.min = 50,	.max = 200,	.step = 10,	.n_bits = 4,
+	.min = 50,	.max = 200,	.step = 10,
 };
 
 static const struct voltage_map_desc *reg_voltage_map[] = {
@@ -279,9 +277,7 @@ static int max8997_reg_is_enabled(struct regulator_dev *rdev)
 	u8 val;
 
 	ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
-	if (ret == -EINVAL)
-		return 1; /* "not controllable" */
-	else if (ret)
+	if (ret)
 		return ret;
 
 	ret = max8997_read_reg(i2c, reg, &val);
@@ -320,6 +316,7 @@ static int max8997_reg_disable(struct regulator_dev *rdev)
 static int max8997_get_voltage_register(struct regulator_dev *rdev,
 		int *_reg, int *_shift, int *_mask)
 {
+	struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 	int rid = rdev_get_id(rdev);
 	int reg, shift = 0, mask = 0x3f;
 
@@ -329,9 +326,13 @@ static int max8997_get_voltage_register(struct regulator_dev *rdev,
 		break;
 	case MAX8997_BUCK1:
 		reg = MAX8997_REG_BUCK1DVS1;
+		if (max8997->buck1_gpiodvs)
+			reg += max8997->buck125_gpioindex;
 		break;
 	case MAX8997_BUCK2:
 		reg = MAX8997_REG_BUCK2DVS1;
+		if (max8997->buck2_gpiodvs)
+			reg += max8997->buck125_gpioindex;
 		break;
 	case MAX8997_BUCK3:
 		reg = MAX8997_REG_BUCK3DVS;
@@ -341,6 +342,8 @@ static int max8997_get_voltage_register(struct regulator_dev *rdev,
 		break;
 	case MAX8997_BUCK5:
 		reg = MAX8997_REG_BUCK5DVS1;
+		if (max8997->buck5_gpiodvs)
+			reg += max8997->buck125_gpioindex;
 		break;
 	case MAX8997_BUCK7:
 		reg = MAX8997_REG_BUCK7DVS;
@@ -376,23 +379,17 @@ static int max8997_get_voltage_register(struct regulator_dev *rdev,
 	return 0;
 }
 
-static int max8997_get_voltage(struct regulator_dev *rdev)
+static int max8997_get_voltage_sel(struct regulator_dev *rdev)
 {
 	struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = max8997->iodev->i2c;
 	int reg, shift, mask, ret;
-	int rid = rdev_get_id(rdev);
 	u8 val;
 
 	ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 	if (ret)
 		return ret;
 
-	if ((rid == MAX8997_BUCK1 && max8997->buck1_gpiodvs) ||
-			(rid == MAX8997_BUCK2 && max8997->buck2_gpiodvs) ||
-			(rid == MAX8997_BUCK5 && max8997->buck5_gpiodvs))
-		reg += max8997->buck125_gpioindex;
-
 	ret = max8997_read_reg(i2c, reg, &val);
 	if (ret)
 		return ret;
@@ -400,22 +397,14 @@ static int max8997_get_voltage(struct regulator_dev *rdev)
 	val >>= shift;
 	val &= mask;
 
-	if (rdev->desc && rdev->desc->ops && rdev->desc->ops->list_voltage)
-		return rdev->desc->ops->list_voltage(rdev, val);
-
-	/*
-	 * max8997_list_voltage returns value for any rdev with voltage_map,
-	 * which works for "CHARGER" and "CHARGER TOPOFF" that do not have
-	 * list_voltage ops (they are current regulators).
-	 */
-	return max8997_list_voltage(rdev, val);
+	return val;
 }
 
 static inline int max8997_get_voltage_proper_val(
 		const struct voltage_map_desc *desc,
 		int min_vol, int max_vol)
 {
-	int i = 0;
+	int i;
 
 	if (desc == NULL)
 		return -EINVAL;
@@ -423,14 +412,12 @@ static inline int max8997_get_voltage_proper_val(
 	if (max_vol < desc->min || min_vol > desc->max)
 		return -EINVAL;
 
-	while (desc->min + desc->step * i < min_vol &&
-			desc->min + desc->step * i < desc->max)
-		i++;
+	if (min_vol < desc->min)
+		min_vol = desc->min;
 
-	if (desc->min + desc->step * i > max_vol)
-		return -EINVAL;
+	i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 
-	if (i >= (1 << desc->n_bits))
+	if (desc->min + desc->step * i > max_vol)
 		return -EINVAL;
 
 	return i;
@@ -499,9 +486,7 @@ static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
 	int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 	const struct voltage_map_desc *desc;
 	int rid = rdev_get_id(rdev);
-	int reg, shift = 0, mask, ret;
-	int i;
-	u8 org;
+	int i, reg, shift, mask, ret;
 
 	switch (rid) {
 	case MAX8997_LDO1 ... MAX8997_LDO21:
@@ -530,21 +515,50 @@ static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
 	if (ret)
 		return ret;
 
-	max8997_read_reg(i2c, reg, &org);
-	org = (org & mask) >> shift;
-
 	ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
 	*selector = i;
 
-	if (rid == MAX8997_BUCK1 || rid == MAX8997_BUCK2 ||
-			rid == MAX8997_BUCK4 || rid == MAX8997_BUCK5) {
-		/* If the voltage is increasing */
-		if (org < i)
-			udelay(DIV_ROUND_UP(desc->step * (i - org),
-						max8997->ramp_delay));
+	return ret;
+}
+
+static int max8997_set_voltage_ldobuck_time_sel(struct regulator_dev *rdev,
+						unsigned int old_selector,
+						unsigned int new_selector)
+{
+	struct max8997_data *max8997 = rdev_get_drvdata(rdev);
+	int rid = rdev_get_id(rdev);
+	const struct voltage_map_desc *desc = reg_voltage_map[rid];
+
+	/* Delay is required only if the voltage is increasing */
+	if (old_selector >= new_selector)
+		return 0;
+
+	/* No need to delay if gpio_dvs_mode */
+	switch (rid) {
+	case MAX8997_BUCK1:
+		if (max8997->buck1_gpiodvs)
+			return 0;
+		break;
+	case MAX8997_BUCK2:
+		if (max8997->buck2_gpiodvs)
+			return 0;
+		break;
+	case MAX8997_BUCK5:
+		if (max8997->buck5_gpiodvs)
+			return 0;
+		break;
 	}
 
-	return ret;
+	switch (rid) {
+	case MAX8997_BUCK1:
+	case MAX8997_BUCK2:
+	case MAX8997_BUCK4:
+	case MAX8997_BUCK5:
+		return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
+				    max8997->ramp_delay);
+	}
+
+	return 0;
 }
 
 /*
@@ -751,11 +765,6 @@ static int max8997_set_voltage_safeout(struct regulator_dev *rdev,
 	return ret;
 }
 
-static int max8997_reg_enable_suspend(struct regulator_dev *rdev)
-{
-	return 0;
-}
-
 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
 {
 	struct max8997_data *max8997 = rdev_get_drvdata(rdev);
@@ -788,9 +797,9 @@ static struct regulator_ops max8997_ldo_ops = {
 	.is_enabled		= max8997_reg_is_enabled,
 	.enable			= max8997_reg_enable,
 	.disable		= max8997_reg_disable,
-	.get_voltage		= max8997_get_voltage,
+	.get_voltage_sel	= max8997_get_voltage_sel,
 	.set_voltage		= max8997_set_voltage_ldobuck,
-	.set_suspend_enable	= max8997_reg_enable_suspend,
+	.set_voltage_time_sel	= max8997_set_voltage_ldobuck_time_sel,
 	.set_suspend_disable	= max8997_reg_disable_suspend,
 };
 
@@ -799,9 +808,9 @@ static struct regulator_ops max8997_buck_ops = {
 	.is_enabled		= max8997_reg_is_enabled,
 	.enable			= max8997_reg_enable,
 	.disable		= max8997_reg_disable,
-	.get_voltage		= max8997_get_voltage,
+	.get_voltage_sel	= max8997_get_voltage_sel,
 	.set_voltage		= max8997_set_voltage_buck,
-	.set_suspend_enable	= max8997_reg_enable_suspend,
+	.set_voltage_time_sel	= max8997_set_voltage_ldobuck_time_sel,
 	.set_suspend_disable	= max8997_reg_disable_suspend,
 };
 
@@ -810,7 +819,6 @@ static struct regulator_ops max8997_fixedvolt_ops = {
 	.is_enabled		= max8997_reg_is_enabled,
 	.enable			= max8997_reg_enable,
 	.disable		= max8997_reg_disable,
-	.set_suspend_enable	= max8997_reg_enable_suspend,
 	.set_suspend_disable	= max8997_reg_disable_suspend,
 };
 
@@ -819,144 +827,117 @@ static struct regulator_ops max8997_safeout_ops = {
 	.is_enabled		= max8997_reg_is_enabled,
 	.enable			= max8997_reg_enable,
 	.disable		= max8997_reg_disable,
-	.get_voltage		= max8997_get_voltage,
+	.get_voltage_sel	= max8997_get_voltage_sel,
 	.set_voltage		= max8997_set_voltage_safeout,
-	.set_suspend_enable	= max8997_reg_enable_suspend,
 	.set_suspend_disable	= max8997_reg_disable_suspend,
 };
 
 static struct regulator_ops max8997_fixedstate_ops = {
 	.list_voltage		= max8997_list_voltage_charger_cv,
-	.get_voltage		= max8997_get_voltage,
+	.get_voltage_sel	= max8997_get_voltage_sel,
 	.set_voltage		= max8997_set_voltage_charger_cv,
 };
 
-static int max8997_set_voltage_ldobuck_wrap(struct regulator_dev *rdev,
-		int min_uV, int max_uV)
+static int max8997_set_current_limit(struct regulator_dev *rdev,
+				     int min_uA, int max_uA)
 {
 	unsigned dummy;
+	int rid = rdev_get_id(rdev);
+
+	if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
+		return -EINVAL;
 
-	return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV, &dummy);
+	/* Reuse max8997_set_voltage_ldobuck to set current_limit. */
+	return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
 }
 
+static int max8997_get_current_limit(struct regulator_dev *rdev)
+{
+	int sel, rid = rdev_get_id(rdev);
+
+	if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
+		return -EINVAL;
+
+	sel = max8997_get_voltage_sel(rdev);
+	if (sel < 0)
+		return sel;
+
+	/* Reuse max8997_list_voltage to get current_limit. */
+	return max8997_list_voltage(rdev, sel);
+}
 
 static struct regulator_ops max8997_charger_ops = {
 	.is_enabled		= max8997_reg_is_enabled,
 	.enable			= max8997_reg_enable,
 	.disable		= max8997_reg_disable,
-	.get_current_limit	= max8997_get_voltage,
-	.set_current_limit	= max8997_set_voltage_ldobuck_wrap,
+	.get_current_limit	= max8997_get_current_limit,
+	.set_current_limit	= max8997_set_current_limit,
 };
 
 static struct regulator_ops max8997_charger_fixedstate_ops = {
-	.is_enabled		= max8997_reg_is_enabled,
-	.get_current_limit	= max8997_get_voltage,
-	.set_current_limit	= max8997_set_voltage_ldobuck_wrap,
+	.get_current_limit	= max8997_get_current_limit,
+	.set_current_limit	= max8997_set_current_limit,
 };
 
-#define regulator_desc_ldo(num)		{	\
-	.name		= "LDO"#num,		\
-	.id		= MAX8997_LDO##num,	\
-	.ops		= &max8997_ldo_ops,	\
+#define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
+	.name		= #_name,		\
+	.id		= MAX8997_##_name,	\
+	.ops		= &_ops,		\
 	.type		= REGULATOR_VOLTAGE,	\
 	.owner		= THIS_MODULE,		\
 }
-#define regulator_desc_buck(num)		{	\
-	.name		= "BUCK"#num,		\
-	.id		= MAX8997_BUCK##num,	\
-	.ops		= &max8997_buck_ops,	\
-	.type		= REGULATOR_VOLTAGE,	\
+
+#define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
+	.name		= #_name,		\
+	.id		= MAX8997_##_name,	\
+	.ops		= &_ops,		\
+	.type		= REGULATOR_CURRENT,	\
 	.owner		= THIS_MODULE,		\
 }
 
 static struct regulator_desc regulators[] = {
-	regulator_desc_ldo(1),
-	regulator_desc_ldo(2),
-	regulator_desc_ldo(3),
-	regulator_desc_ldo(4),
-	regulator_desc_ldo(5),
-	regulator_desc_ldo(6),
-	regulator_desc_ldo(7),
-	regulator_desc_ldo(8),
-	regulator_desc_ldo(9),
-	regulator_desc_ldo(10),
-	regulator_desc_ldo(11),
-	regulator_desc_ldo(12),
-	regulator_desc_ldo(13),
-	regulator_desc_ldo(14),
-	regulator_desc_ldo(15),
-	regulator_desc_ldo(16),
-	regulator_desc_ldo(17),
-	regulator_desc_ldo(18),
-	regulator_desc_ldo(21),
-	regulator_desc_buck(1),
-	regulator_desc_buck(2),
-	regulator_desc_buck(3),
-	regulator_desc_buck(4),
-	regulator_desc_buck(5),
-	{
-		.name	= "BUCK6",
-		.id	= MAX8997_BUCK6,
-		.ops	= &max8997_fixedvolt_ops,
-		.type	= REGULATOR_VOLTAGE,
-		.owner	= THIS_MODULE,
-	},
-	regulator_desc_buck(7),
-	{
-		.name	= "EN32KHz_AP",
-		.id	= MAX8997_EN32KHZ_AP,
-		.ops	= &max8997_fixedvolt_ops,
-		.type	= REGULATOR_VOLTAGE,
-		.owner	= THIS_MODULE,
-	}, {
-		.name	= "EN32KHz_CP",
-		.id	= MAX8997_EN32KHZ_CP,
-		.ops	= &max8997_fixedvolt_ops,
-		.type	= REGULATOR_VOLTAGE,
-		.owner	= THIS_MODULE,
-	}, {
-		.name	= "ENVICHG",
-		.id	= MAX8997_ENVICHG,
-		.ops	= &max8997_fixedvolt_ops,
-		.type	= REGULATOR_VOLTAGE,
-		.owner	= THIS_MODULE,
-	}, {
-		.name	= "ESAFEOUT1",
-		.id	= MAX8997_ESAFEOUT1,
-		.ops	= &max8997_safeout_ops,
-		.type	= REGULATOR_VOLTAGE,
-		.owner	 = THIS_MODULE,
-	}, {
-		.name	= "ESAFEOUT2",
-		.id	= MAX8997_ESAFEOUT2,
-		.ops	= &max8997_safeout_ops,
-		.type	= REGULATOR_VOLTAGE,
-		.owner	 = THIS_MODULE,
-	}, {
-		.name	= "CHARGER_CV",
-		.id	= MAX8997_CHARGER_CV,
-		.ops	= &max8997_fixedstate_ops,
-		.type	= REGULATOR_VOLTAGE,
-		.owner	 = THIS_MODULE,
-	}, {
-		.name	= "CHARGER",
-		.id	= MAX8997_CHARGER,
-		.ops	= &max8997_charger_ops,
-		.type	= REGULATOR_CURRENT,
-		.owner	 = THIS_MODULE,
-	}, {
-		.name	= "CHARGER_TOPOFF",
-		.id	= MAX8997_CHARGER_TOPOFF,
-		.ops	= &max8997_charger_fixedstate_ops,
-		.type	= REGULATOR_CURRENT,
-		.owner	 = THIS_MODULE,
-	},
+	MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
+	MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
+	MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
+	MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
+	MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
+	MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
+	MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
+	MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
+	MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
+	MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
+	MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
+	MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
+	MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
+	MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
+	MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
+	MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
+				  max8997_charger_fixedstate_ops),
 };
 
 static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 {
 	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
+	struct regulator_config config = { };
 	struct regulator_dev **rdev;
 	struct max8997_data *max8997;
 	struct i2c_client *i2c;
@@ -968,16 +949,15 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	max8997 = kzalloc(sizeof(struct max8997_data), GFP_KERNEL);
+	max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
+			       GFP_KERNEL);
 	if (!max8997)
 		return -ENOMEM;
 
 	size = sizeof(struct regulator_dev *) * pdata->num_regulators;
-	max8997->rdev = kzalloc(size, GFP_KERNEL);
-	if (!max8997->rdev) {
-		kfree(max8997);
+	max8997->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
+	if (!max8997->rdev)
 		return -ENOMEM;
-	}
 
 	rdev = max8997->rdev;
 	max8997->dev = &pdev->dev;
@@ -1001,7 +981,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 					pdata->buck1_voltage[i] / 1000 +
 					buck1245_voltage_map_desc.step);
 		if (ret < 0)
-			goto err_alloc;
+			goto err_out;
 
 		max8997->buck2_vol[i] = ret =
 			max8997_get_voltage_proper_val(
@@ -1010,7 +990,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 					pdata->buck2_voltage[i] / 1000 +
 					buck1245_voltage_map_desc.step);
 		if (ret < 0)
-			goto err_alloc;
+			goto err_out;
 
 		max8997->buck5_vol[i] = ret =
 			max8997_get_voltage_proper_val(
@@ -1019,7 +999,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 					pdata->buck5_voltage[i] / 1000 +
 					buck1245_voltage_map_desc.step);
 		if (ret < 0)
-			goto err_alloc;
+			goto err_out;
 
 		if (max_buck1 < max8997->buck1_vol[i])
 			max_buck1 = max8997->buck1_vol[i];
@@ -1052,7 +1032,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 				!gpio_is_valid(pdata->buck125_gpios[2])) {
 			dev_err(&pdev->dev, "GPIO NOT VALID\n");
 			ret = -EINVAL;
-			goto err_alloc;
+			goto err_out;
 		}
 
 		ret = gpio_request(pdata->buck125_gpios[0],
@@ -1061,7 +1041,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 			dev_warn(&pdev->dev, "Duplicated gpio request"
 					" on SET1\n");
 		else if (ret)
-			goto err_alloc;
+			goto err_out;
 		else
 			gpio1set = true;
 
@@ -1073,7 +1053,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 		else if (ret) {
 			if (gpio1set)
 				gpio_free(pdata->buck125_gpios[0]);
-			goto err_alloc;
+			goto err_out;
 		} else
 			gpio2set = true;
 
@@ -1087,7 +1067,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 				gpio_free(pdata->buck125_gpios[0]);
 			if (gpio2set)
 				gpio_free(pdata->buck125_gpios[1]);
-			goto err_alloc;
+			goto err_out;
 		}
 
 		gpio_direction_output(pdata->buck125_gpios[0],
@@ -1140,8 +1120,11 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 		else if (id == MAX8997_CHARGER_CV)
 			regulators[id].n_voltages = 16;
 
-		rdev[i] = regulator_register(&regulators[id], max8997->dev,
-				pdata->regulators[i].initdata, max8997, NULL);
+		config.dev = max8997->dev;
+		config.init_data = pdata->regulators[i].initdata;
+		config.driver_data = max8997;
+
+		rdev[i] = regulator_register(&regulators[id], &config);
 		if (IS_ERR(rdev[i])) {
 			ret = PTR_ERR(rdev[i]);
 			dev_err(max8997->dev, "regulator init failed for %d\n",
@@ -1153,13 +1136,9 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 
 	return 0;
 err:
-	for (i = 0; i < max8997->num_regulators; i++)
-		if (rdev[i])
-			regulator_unregister(rdev[i]);
-err_alloc:
-	kfree(max8997->rdev);
-	kfree(max8997);
-
+	while (--i >= 0)
+		regulator_unregister(rdev[i]);
+err_out:
 	return ret;
 }
 
@@ -1170,12 +1149,7 @@ static int __devexit max8997_pmic_remove(struct platform_device *pdev)
 	int i;
 
 	for (i = 0; i < max8997->num_regulators; i++)
-		if (rdev[i])
-			regulator_unregister(rdev[i]);
-
-	kfree(max8997->rdev);
-	kfree(max8997);
-
+		regulator_unregister(rdev[i]);
 	return 0;
 }