Commit 9767ec7f authored by Sangbeom Kim's avatar Sangbeom Kim Committed by Mark Brown
Browse files

regulator: Add S5M8767A regulator driver 



S5M8767A is a cost-effective PMIC which is designed for mobile applications.
It includes high efficient 9 Buck converters, 28 LDOs.
Especially, S5M8767A is optimized for Multi-core SOCs.
And during DVFS operation, S5M8767A output stable voltage.
This patch implement regulator driver for S5M8767A.

Signed-off-by: default avatarSangbeom Kim <sbkim73@samsung.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 6219929f

drivers/regulator/s5m8767.c

0 → 100644
+834 −0
Original line number Diff line number Diff line 
/*

 * s5m8767.c

 *

 * Copyright (c) 2011 Samsung Electronics Co., Ltd

 *              http://www.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.

 *

 */



#include <linux/bug.h>

#include <linux/delay.h>

#include <linux/err.h>

#include <linux/gpio.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/machine.h>

#include <linux/mfd/s5m87xx/s5m-core.h>

#include <linux/mfd/s5m87xx/s5m-pmic.h>



struct s5m8767_info {

	struct device *dev;

	struct s5m87xx_dev *iodev;

	int num_regulators;

	struct regulator_dev **rdev;



	int ramp_delay;

	bool buck2_ramp;

	bool buck3_ramp;

	bool buck4_ramp;



	bool buck2_gpiodvs;

	bool buck3_gpiodvs;

	bool buck4_gpiodvs;

	u8 buck2_vol[8];

	u8 buck3_vol[8];

	u8 buck4_vol[8];

	int buck_gpios[3];

	int buck_gpioindex;

};



struct s5m_voltage_desc {

	int max;

	int min;

	int step;

};



static const struct s5m_voltage_desc buck_voltage_val1 = {

	.max = 2225000,

	.min =  650000,

	.step =   6250,

};



static const struct s5m_voltage_desc buck_voltage_val2 = {

	.max = 1600000,

	.min =  600000,

	.step =   6250,

};



static const struct s5m_voltage_desc buck_voltage_val3 = {

	.max = 3000000,

	.min =  750000,

	.step =  12500,

};



static const struct s5m_voltage_desc ldo_voltage_val1 = {

	.max = 3950000,

	.min =  800000,

	.step =  50000,

};



static const struct s5m_voltage_desc ldo_voltage_val2 = {

	.max = 2375000,

	.min =  800000,

	.step =  25000,

};



static const struct s5m_voltage_desc *reg_voltage_map[] = {

	[S5M8767_LDO1] = &ldo_voltage_val2,

	[S5M8767_LDO2] = &ldo_voltage_val2,

	[S5M8767_LDO3] = &ldo_voltage_val1,

	[S5M8767_LDO4] = &ldo_voltage_val1,

	[S5M8767_LDO5] = &ldo_voltage_val1,

	[S5M8767_LDO6] = &ldo_voltage_val2,

	[S5M8767_LDO7] = &ldo_voltage_val2,

	[S5M8767_LDO8] = &ldo_voltage_val2,

	[S5M8767_LDO9] = &ldo_voltage_val1,

	[S5M8767_LDO10] = &ldo_voltage_val1,

	[S5M8767_LDO11] = &ldo_voltage_val1,

	[S5M8767_LDO12] = &ldo_voltage_val1,

	[S5M8767_LDO13] = &ldo_voltage_val1,

	[S5M8767_LDO14] = &ldo_voltage_val1,

	[S5M8767_LDO15] = &ldo_voltage_val2,

	[S5M8767_LDO16] = &ldo_voltage_val1,

	[S5M8767_LDO17] = &ldo_voltage_val1,

	[S5M8767_LDO18] = &ldo_voltage_val1,

	[S5M8767_LDO19] = &ldo_voltage_val1,

	[S5M8767_LDO20] = &ldo_voltage_val1,

	[S5M8767_LDO21] = &ldo_voltage_val1,

	[S5M8767_LDO22] = &ldo_voltage_val1,

	[S5M8767_LDO23] = &ldo_voltage_val1,

	[S5M8767_LDO24] = &ldo_voltage_val1,

	[S5M8767_LDO25] = &ldo_voltage_val1,

	[S5M8767_LDO26] = &ldo_voltage_val1,

	[S5M8767_LDO27] = &ldo_voltage_val1,

	[S5M8767_LDO28] = &ldo_voltage_val1,

	[S5M8767_BUCK1] = &buck_voltage_val1,

	[S5M8767_BUCK2] = &buck_voltage_val2,

	[S5M8767_BUCK3] = &buck_voltage_val2,

	[S5M8767_BUCK4] = &buck_voltage_val2,

	[S5M8767_BUCK5] = &buck_voltage_val1,

	[S5M8767_BUCK6] = &buck_voltage_val1,

	[S5M8767_BUCK7] = NULL,

	[S5M8767_BUCK8] = NULL,

	[S5M8767_BUCK9] = &buck_voltage_val3,

};



static inline int s5m8767_get_reg_id(struct regulator_dev *rdev)

{

	return rdev_get_id(rdev);

}



static int s5m8767_list_voltage(struct regulator_dev *rdev,

				unsigned int selector)

{

	const struct s5m_voltage_desc *desc;

	int reg_id = s5m8767_get_reg_id(rdev);

	int val;



	if (reg_id >= ARRAY_SIZE(reg_voltage_map) || reg_id < 0)

		return -EINVAL;



	desc = reg_voltage_map[reg_id];

	if (desc == NULL)

		return -EINVAL;



	val = desc->min + desc->step * selector;

	if (val > desc->max)

		return -EINVAL;



	return val;

}



static int s5m8767_get_register(struct regulator_dev *rdev, int *reg)

{

	int reg_id = s5m8767_get_reg_id(rdev);



	switch (reg_id) {

	case S5M8767_LDO1 ... S5M8767_LDO2:

		*reg = S5M8767_REG_LDO1CTRL + (reg_id - S5M8767_LDO1);

		break;

	case S5M8767_LDO3 ... S5M8767_LDO28:

		*reg = S5M8767_REG_LDO3CTRL + (reg_id - S5M8767_LDO3);

		break;

	case S5M8767_BUCK1:

		*reg = S5M8767_REG_BUCK1CTRL1;

		break;

	case S5M8767_BUCK2 ... S5M8767_BUCK4:

		*reg = S5M8767_REG_BUCK2CTRL + (reg_id - S5M8767_BUCK2) * 9;

		break;

	case S5M8767_BUCK5:

		*reg = S5M8767_REG_BUCK5CTRL1;

		break;

	case S5M8767_BUCK6 ... S5M8767_BUCK9:

		*reg = S5M8767_REG_BUCK6CTRL1 + (reg_id - S5M8767_BUCK6) * 2;

		break;

	default:

		return -EINVAL;

	}



	return 0;

}



static int s5m8767_reg_is_enabled(struct regulator_dev *rdev)

{

	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);

	int ret, reg;

	int mask = 0xc0, pattern = 0xc0;

	u8 val;



	ret = s5m8767_get_register(rdev, &reg);

	if (ret == -EINVAL)

		return 1;

	else if (ret)

		return ret;



	ret = s5m_reg_read(s5m8767->iodev, reg, &val);

	if (ret)

		return ret;



	return (val & mask) == pattern;

}



static int s5m8767_reg_enable(struct regulator_dev *rdev)

{

	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);

	int ret, reg;

	int mask = 0xc0, pattern = 0xc0;



	ret = s5m8767_get_register(rdev, &reg);

	if (ret)

		return ret;



	return s5m_reg_update(s5m8767->iodev, reg, pattern, mask);

}



static int s5m8767_reg_disable(struct regulator_dev *rdev)

{

	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);

	int ret, reg;

	int  mask = 0xc0, pattern = 0xc0;



	ret = s5m8767_get_register(rdev, &reg);

	if (ret)

		return ret;



	return s5m_reg_update(s5m8767->iodev, reg, ~pattern, mask);

}



static int s5m8767_get_voltage_register(struct regulator_dev *rdev, int *_reg)

{

	int reg_id = s5m8767_get_reg_id(rdev);

	int reg;



	switch (reg_id) {

	case S5M8767_LDO1 ... S5M8767_LDO2:

		reg = S5M8767_REG_LDO1CTRL + (reg_id - S5M8767_LDO1);

		break;

	case S5M8767_LDO3 ... S5M8767_LDO28:

		reg = S5M8767_REG_LDO3CTRL + (reg_id - S5M8767_LDO3);

		break;

	case S5M8767_BUCK1:

		reg = S5M8767_REG_BUCK1CTRL2;

		break;

	case S5M8767_BUCK2:

		reg = S5M8767_REG_BUCK2DVS1;

		break;

	case S5M8767_BUCK3:

		reg = S5M8767_REG_BUCK3DVS1;

		break;

	case S5M8767_BUCK4:

		reg = S5M8767_REG_BUCK4DVS1;

		break;

	case S5M8767_BUCK5:

		reg = S5M8767_REG_BUCK5CTRL2;

		break;

	case S5M8767_BUCK6 ... S5M8767_BUCK9:

		reg = S5M8767_REG_BUCK6CTRL2 + (reg_id - S5M8767_BUCK6) * 2;

		break;

	default:

		return -EINVAL;

	}



	*_reg = reg;



	return 0;

}



static int s5m8767_get_voltage_sel(struct regulator_dev *rdev)

{

	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);

	int reg, mask = 0xff, ret;

	int reg_id = s5m8767_get_reg_id(rdev);

	u8 val;



	ret = s5m8767_get_voltage_register(rdev, &reg);

	if (ret)

		return ret;



	switch (reg_id) {

	case S5M8767_LDO1 ... S5M8767_LDO28:

		mask = 0x3f;

		break;

	case S5M8767_BUCK2:

		if (s5m8767->buck2_gpiodvs)

			reg += s5m8767->buck_gpioindex;

		break;

	case S5M8767_BUCK3:

		if (s5m8767->buck3_gpiodvs)

			reg += s5m8767->buck_gpioindex;

		break;

	case S5M8767_BUCK4:

		if (s5m8767->buck4_gpiodvs)

			reg += s5m8767->buck_gpioindex;

		break;

	}



	ret = s5m_reg_read(s5m8767->iodev, reg, &val);

	if (ret)

		return ret;



	val &= mask;



	return val;

}



static inline int s5m8767_convert_voltage(

		const struct s5m_voltage_desc *desc,

		int min_vol, int max_vol)

{

	int out_vol = 0;



	if (desc == NULL)

		return -EINVAL;



	if (max_vol < desc->min || min_vol > desc->max)

		return -EINVAL;



	out_vol = (min_vol - desc->min) / desc->step;



	if (desc->min + desc->step * out_vol > max_vol)

		return -EINVAL;



	return out_vol;

}



static int s5m8767_set_voltage(struct regulator_dev *rdev,

				int min_uV, int max_uV, unsigned *selector)

{

	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);

	int min_vol = min_uV, max_vol = max_uV;

	const struct s5m_voltage_desc *desc;

	int reg_id = s5m8767_get_reg_id(rdev);

	int reg, mask, ret;

	int i;

	u8 val;



	switch (reg_id) {

	case S5M8767_LDO1 ... S5M8767_LDO28:

		mask = 0x3f;

		break;

	case S5M8767_BUCK1 ... S5M8767_BUCK6:

		mask = 0xff;

		break;

	case S5M8767_BUCK7 ... S5M8767_BUCK8:

		return -EINVAL;

	case S5M8767_BUCK9:

		mask = 0xff;

		break;

	default:

		return -EINVAL;

	}



	desc = reg_voltage_map[reg_id];



	i = s5m8767_convert_voltage(desc, min_vol, max_vol);

	if (i < 0)

		return i;



	ret = s5m8767_get_voltage_register(rdev, &reg);

	if (ret)

		return ret;



	s5m_reg_read(s5m8767->iodev, reg, &val);

	val = val & mask;



	ret = s5m_reg_write(s5m8767->iodev, reg, val);

	*selector = i;



	return ret;

}



static inline void s5m8767_set_high(struct s5m8767_info *s5m8767)

{

	int temp_index = s5m8767->buck_gpioindex;



	gpio_set_value(s5m8767->buck_gpios[0], (temp_index >> 2) & 0x1);

	gpio_set_value(s5m8767->buck_gpios[1], (temp_index >> 1) & 0x1);

	gpio_set_value(s5m8767->buck_gpios[2], temp_index & 0x1);

}



static inline void s5m8767_set_low(struct s5m8767_info *s5m8767)

{

	int temp_index = s5m8767->buck_gpioindex;



	gpio_set_value(s5m8767->buck_gpios[2], temp_index & 0x1);

	gpio_set_value(s5m8767->buck_gpios[1], (temp_index >> 1) & 0x1);

	gpio_set_value(s5m8767->buck_gpios[0], (temp_index >> 2) & 0x1);

}



static int s5m8767_set_voltage_buck(struct regulator_dev *rdev,

				    int min_uV, int max_uV, unsigned *selector)

{

	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);

	int reg_id = s5m8767_get_reg_id(rdev);

	const struct s5m_voltage_desc *desc;

	int new_val, old_val, i = 0;

	int min_vol = min_uV, max_vol = max_uV;



	if (reg_id < S5M8767_BUCK1 || reg_id > S5M8767_BUCK6)

		return -EINVAL;



	switch (reg_id) {

	case S5M8767_BUCK1:

		return s5m8767_set_voltage(rdev, min_uV, max_uV, selector);

	case S5M8767_BUCK2 ... S5M8767_BUCK4:

		break;

	case S5M8767_BUCK5 ... S5M8767_BUCK6:

		return s5m8767_set_voltage(rdev, min_uV, max_uV, selector);

	case S5M8767_BUCK9:

		return s5m8767_set_voltage(rdev, min_uV, max_uV, selector);

	}



	desc = reg_voltage_map[reg_id];

	new_val = s5m8767_convert_voltage(desc, min_vol, max_vol);

	if (new_val < 0)

		return new_val;



	switch (reg_id) {

	case S5M8767_BUCK2:

		if (s5m8767->buck2_gpiodvs) {

			while (s5m8767->buck2_vol[i] != new_val)

				i++;

		} else

			return s5m8767_set_voltage(rdev, min_uV,

						   max_uV, selector);

		break;

	case S5M8767_BUCK3:

		if (s5m8767->buck3_gpiodvs) {

			while (s5m8767->buck3_vol[i] != new_val)

				i++;

		} else

			return s5m8767_set_voltage(rdev, min_uV,

						   max_uV, selector);

		break;

	case S5M8767_BUCK4:

		if (s5m8767->buck3_gpiodvs) {

			while (s5m8767->buck4_vol[i] != new_val)

				i++;

		} else

			return s5m8767_set_voltage(rdev, min_uV,

						   max_uV, selector);

		break;

	}



	old_val = s5m8767->buck_gpioindex;

	s5m8767->buck_gpioindex = i;



	if (i > old_val)

		s5m8767_set_high(s5m8767);

	else

		s5m8767_set_low(s5m8767);



	*selector = new_val;

	return 0;

}



static int s5m8767_set_voltage_time_sel(struct regulator_dev *rdev,

					     unsigned int old_sel,

					     unsigned int new_sel)

{

	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);

	const struct s5m_voltage_desc *desc;

	int reg_id = s5m8767_get_reg_id(rdev);

	int mask;

	int new_val, old_val;



	switch (reg_id) {

	case S5M8767_LDO1 ... S5M8767_LDO28:

		mask = 0x3f;

		break;

	case S5M8767_BUCK1 ... S5M8767_BUCK6:

		mask = 0xff;

		break;

	case S5M8767_BUCK7 ... S5M8767_BUCK8:

		return -EINVAL;

	case S5M8767_BUCK9:

		mask = 0xff;

		break;

	default:

		return -EINVAL;

	}

	desc = reg_voltage_map[reg_id];



	new_val = s5m8767_convert_voltage(desc, new_sel, new_sel);

	if (new_val < 0)

		return new_val;



	old_val = s5m8767_convert_voltage(desc, old_sel, old_sel);

	if (old_val < 0)

		return old_val;



	if (old_sel < new_sel)

		return DIV_ROUND_UP(desc->step * (new_val - old_val),

					s5m8767->ramp_delay);

	else

		return 0;

}



static struct regulator_ops s5m8767_ldo_ops = {

	.list_voltage		= s5m8767_list_voltage,

	.is_enabled		= s5m8767_reg_is_enabled,

	.enable			= s5m8767_reg_enable,

	.disable		= s5m8767_reg_disable,

	.get_voltage_sel	= s5m8767_get_voltage_sel,

	.set_voltage		= s5m8767_set_voltage,

	.set_voltage_time_sel	= s5m8767_set_voltage_time_sel,

};



static struct regulator_ops s5m8767_buck_ops = {

	.list_voltage		= s5m8767_list_voltage,

	.is_enabled		= s5m8767_reg_is_enabled,

	.enable			= s5m8767_reg_enable,

	.disable		= s5m8767_reg_disable,

	.get_voltage_sel	= s5m8767_get_voltage_sel,

	.set_voltage		= s5m8767_set_voltage_buck,

	.set_voltage_time_sel	= s5m8767_set_voltage_time_sel,

};



#define regulator_desc_ldo(num)		{	\

	.name		= "LDO"#num,		\

	.id		= S5M8767_LDO##num,	\

	.ops		= &s5m8767_ldo_ops,	\

	.type		= REGULATOR_VOLTAGE,	\

	.owner		= THIS_MODULE,		\

}

#define regulator_desc_buck(num)	{	\

	.name		= "BUCK"#num,		\

	.id		= S5M8767_BUCK##num,	\

	.ops		= &s5m8767_buck_ops,	\

	.type		= REGULATOR_VOLTAGE,	\

	.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(19),

	regulator_desc_ldo(20),

	regulator_desc_ldo(21),

	regulator_desc_ldo(22),

	regulator_desc_ldo(23),

	regulator_desc_ldo(24),

	regulator_desc_ldo(25),

	regulator_desc_ldo(26),

	regulator_desc_ldo(27),

	regulator_desc_ldo(28),

	regulator_desc_buck(1),

	regulator_desc_buck(2),

	regulator_desc_buck(3),

	regulator_desc_buck(4),

	regulator_desc_buck(5),

	regulator_desc_buck(6),

	regulator_desc_buck(7),

	regulator_desc_buck(8),

	regulator_desc_buck(9),

};



static __devinit int s5m8767_pmic_probe(struct platform_device *pdev)

{

	struct s5m87xx_dev *iodev = dev_get_drvdata(pdev->dev.parent);

	struct s5m_platform_data *pdata = dev_get_platdata(iodev->dev);

	struct regulator_dev **rdev;

	struct s5m8767_info *s5m8767;

	struct i2c_client *i2c;

	int i, ret, size, reg;



	if (!pdata) {

		dev_err(pdev->dev.parent, "Platform data not supplied\n");

		return -ENODEV;

	}



	s5m8767 = devm_kzalloc(&pdev->dev, sizeof(struct s5m8767_info),

				GFP_KERNEL);

	if (!s5m8767)

		return -ENOMEM;



	size = sizeof(struct regulator_dev *) * (S5M8767_REG_MAX - 2);

	s5m8767->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);

	if (!s5m8767->rdev)

		return -ENOMEM;



	rdev = s5m8767->rdev;

	s5m8767->dev = &pdev->dev;

	s5m8767->iodev = iodev;

	s5m8767->num_regulators = S5M8767_REG_MAX - 2;

	platform_set_drvdata(pdev, s5m8767);

	i2c = s5m8767->iodev->i2c;



	s5m8767->buck_gpioindex = pdata->buck_default_idx;

	s5m8767->buck2_gpiodvs = pdata->buck2_gpiodvs;

	s5m8767->buck3_gpiodvs = pdata->buck3_gpiodvs;

	s5m8767->buck4_gpiodvs = pdata->buck4_gpiodvs;

	s5m8767->buck_gpios[0] = pdata->buck_gpios[0];

	s5m8767->buck_gpios[1] = pdata->buck_gpios[1];

	s5m8767->buck_gpios[2] = pdata->buck_gpios[2];

	s5m8767->ramp_delay = pdata->buck_ramp_delay;

	s5m8767->buck2_ramp = pdata->buck2_ramp_enable;

	s5m8767->buck3_ramp = pdata->buck3_ramp_enable;

	s5m8767->buck4_ramp = pdata->buck4_ramp_enable;



	for (i = 0; i < 8; i++) {

		if (s5m8767->buck2_gpiodvs) {

			s5m8767->buck2_vol[i] =

				s5m8767_convert_voltage(

						&buck_voltage_val2,

						pdata->buck2_voltage[i],

						pdata->buck2_voltage[i] +

						buck_voltage_val2.step);

		}



		if (s5m8767->buck3_gpiodvs) {

			s5m8767->buck3_vol[i] =

				s5m8767_convert_voltage(

						&buck_voltage_val2,

						pdata->buck3_voltage[i],

						pdata->buck3_voltage[i] +

						buck_voltage_val2.step);

		}



		if (s5m8767->buck4_gpiodvs) {

			s5m8767->buck4_vol[i] =

				s5m8767_convert_voltage(

						&buck_voltage_val2,

						pdata->buck4_voltage[i],

						pdata->buck4_voltage[i] +

						buck_voltage_val2.step);

		}

	}



	if (pdata->buck2_gpiodvs || pdata->buck3_gpiodvs ||

		pdata->buck4_gpiodvs) {

		if (gpio_is_valid(pdata->buck_gpios[0]) &&

			gpio_is_valid(pdata->buck_gpios[1]) &&

			gpio_is_valid(pdata->buck_gpios[2])) {

			ret = gpio_request(pdata->buck_gpios[0],

						"S5M8767 SET1");

			if (ret == -EBUSY)

				dev_warn(&pdev->dev, "Duplicated gpio request for SET1\n");



			ret = gpio_request(pdata->buck_gpios[1],

					   "S5M8767 SET2");

			if (ret == -EBUSY)

				dev_warn(&pdev->dev, "Duplicated gpio request for SET2\n");



			ret = gpio_request(pdata->buck_gpios[2],

					   "S5M8767 SET3");

			if (ret == -EBUSY)

				dev_warn(&pdev->dev, "Duplicated gpio request for SET3\n");

			/* SET1 GPIO */

			gpio_direction_output(pdata->buck_gpios[0],

					(s5m8767->buck_gpioindex >> 2) & 0x1);

			/* SET2 GPIO */

			gpio_direction_output(pdata->buck_gpios[1],

					(s5m8767->buck_gpioindex >> 1) & 0x1);

			/* SET3 GPIO */

			gpio_direction_output(pdata->buck_gpios[2],

					(s5m8767->buck_gpioindex >> 0) & 0x1);

			ret = 0;

		} else {

			dev_err(&pdev->dev, "GPIO NOT VALID\n");

			ret = -EINVAL;

			return ret;

		}

	}



	if (pdata->buck2_gpiodvs) {

		if (pdata->buck3_gpiodvs || pdata->buck4_gpiodvs) {

			dev_err(&pdev->dev, "S5M8767 GPIO DVS NOT VALID\n");

			ret = -EINVAL;

			return ret;

		}

	}



	if (pdata->buck3_gpiodvs) {

		if (pdata->buck2_gpiodvs || pdata->buck4_gpiodvs) {

			dev_err(&pdev->dev, "S5M8767 GPIO DVS NOT VALID\n");

			ret = -EINVAL;

			return ret;

		}

	}



	if (pdata->buck4_gpiodvs) {

		if (pdata->buck2_gpiodvs || pdata->buck3_gpiodvs) {

			dev_err(&pdev->dev, "S5M8767 GPIO DVS NOT VALID\n");

			ret = -EINVAL;

			return ret;

		}

	}



	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK2CTRL,

			(pdata->buck2_gpiodvs) ? (1 << 1) : (0 << 1), 1 << 1);

	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK3CTRL,

			(pdata->buck3_gpiodvs) ? (1 << 1) : (0 << 1), 1 << 1);

	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK4CTRL,

			(pdata->buck4_gpiodvs) ? (1 << 1) : (0 << 1), 1 << 1);



	/* Initialize GPIO DVS registers */

	for (i = 0; i < 8; i++) {

		if (s5m8767->buck2_gpiodvs) {

			s5m_reg_write(s5m8767->iodev, S5M8767_REG_BUCK2DVS1 + i,

					   s5m8767->buck2_vol[i]);

		}



		if (s5m8767->buck3_gpiodvs) {

			s5m_reg_write(s5m8767->iodev, S5M8767_REG_BUCK3DVS1 + i,

					   s5m8767->buck3_vol[i]);

		}



		if (s5m8767->buck4_gpiodvs) {

			s5m_reg_write(s5m8767->iodev, S5M8767_REG_BUCK4DVS1 + i,

					   s5m8767->buck4_vol[i]);

		}

	}

	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK2CTRL, 0x78, 0xff);

	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK3CTRL, 0x58, 0xff);

	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK4CTRL, 0x78, 0xff);



	if (s5m8767->buck2_ramp)

		s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP, 0x08, 0x08);



	if (s5m8767->buck3_ramp)

		s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP, 0x04, 0x04);



	if (s5m8767->buck4_ramp)

		s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP, 0x02, 0x02);



	if (s5m8767->buck2_ramp || s5m8767->buck3_ramp

		|| s5m8767->buck4_ramp) {

		switch (s5m8767->ramp_delay) {

		case 15:

			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,

					0xc0, 0xf0);

		case 25:

			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,

					0xd0, 0xf0);

		case 50:

			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,

					0xe0, 0xf0);

		case 100:

			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,

					0xf0, 0xf0);

		default:

			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,

					0x90, 0xf0);

		}

	}



	for (i = 0; i < pdata->num_regulators; i++) {

		const struct s5m_voltage_desc *desc;

		int id = pdata->regulators[i].id;



		desc = reg_voltage_map[id];

		if (desc)

			regulators[id].n_voltages =

				(desc->max - desc->min) / desc->step + 1;



		rdev[i] = regulator_register(&regulators[id], s5m8767->dev,

				pdata->regulators[i].initdata, s5m8767);

		if (IS_ERR(rdev[i])) {

			ret = PTR_ERR(rdev[i]);

			dev_err(s5m8767->dev, "regulator init failed for %d\n",

					id);

			rdev[i] = NULL;

			goto err;

		}

	}



	return 0;

err:

	for (i = 0; i < s5m8767->num_regulators; i++)

		if (rdev[i])

			regulator_unregister(rdev[i]);



	return ret;

}



static int __devexit s5m8767_pmic_remove(struct platform_device *pdev)

{

	struct s5m8767_info *s5m8767 = platform_get_drvdata(pdev);

	struct regulator_dev **rdev = s5m8767->rdev;

	int i;



	for (i = 0; i < s5m8767->num_regulators; i++)

		if (rdev[i])

			regulator_unregister(rdev[i]);



	return 0;

}



static const struct platform_device_id s5m8767_pmic_id[] = {

	{ "s5m8767-pmic", 0},

	{ },

};

MODULE_DEVICE_TABLE(platform, s5m8767_pmic_id);



static struct platform_driver s5m8767_pmic_driver = {

	.driver = {

		.name = "s5m8767-pmic",

		.owner = THIS_MODULE,

	},

	.probe = s5m8767_pmic_probe,

	.remove = __devexit_p(s5m8767_pmic_remove),

	.id_table = s5m8767_pmic_id,

};



static int __init s5m8767_pmic_init(void)

{

	return platform_driver_register(&s5m8767_pmic_driver);

}

subsys_initcall(s5m8767_pmic_init);



static void __exit s5m8767_pmic_exit(void)

{

	platform_driver_unregister(&s5m8767_pmic_driver);

}

module_exit(s5m8767_pmic_exit);



/* Module information */

MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");

MODULE_DESCRIPTION("SAMSUNG S5M8767 Regulator Driver");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:s5m8767-pmic");

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