drivers/regulator/s2mpa01.c - arm/linux-arm64-legacy - Git at Google

 /*
  * Copyright (c) 2013 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/err.h>
 #include <linux/gpio.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/regmap.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/mfd/samsung/core.h>
 #include <linux/mfd/samsung/s2mpa01.h>

 #define S2MPA01_REGULATOR_CNT ARRAY_SIZE(regulators)

 struct s2mpa01_info {
 	int ramp_delay24;
 	int ramp_delay3;
 	int ramp_delay5;
 	int ramp_delay16;
 	int ramp_delay7;
 	int ramp_delay8910;
 };

 static int get_ramp_delay(int ramp_delay)
 {
 	unsigned char cnt = 0;

 	ramp_delay /= 6250;

 	while (true) {
 		ramp_delay = ramp_delay >> 1;
 		if (ramp_delay == 0)
 			break;
 		cnt++;
 	}

 	if (cnt > 3)
 		cnt = 3;

 	return cnt;
 }

 static int s2mpa01_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
 				   unsigned int old_selector,
 				   unsigned int new_selector)
 {
 	struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
 	unsigned int ramp_delay = 0;
 	int old_volt, new_volt;

 	switch (rdev->desc->id) {
 	case S2MPA01_BUCK2:
 	case S2MPA01_BUCK4:
 		ramp_delay = s2mpa01->ramp_delay24;
 		break;
 	case S2MPA01_BUCK3:
 		ramp_delay = s2mpa01->ramp_delay3;
 		break;
 	case S2MPA01_BUCK5:
 		ramp_delay = s2mpa01->ramp_delay5;
 		break;
 	case S2MPA01_BUCK1:
 	case S2MPA01_BUCK6:
 		ramp_delay = s2mpa01->ramp_delay16;
 		break;
 	case S2MPA01_BUCK7:
 		ramp_delay = s2mpa01->ramp_delay7;
 		break;
 	case S2MPA01_BUCK8:
 	case S2MPA01_BUCK9:
 	case S2MPA01_BUCK10:
 		ramp_delay = s2mpa01->ramp_delay8910;
 		break;
 	}

 	if (ramp_delay == 0)
 		ramp_delay = rdev->desc->ramp_delay;

 	old_volt = rdev->desc->min_uV + (rdev->desc->uV_step * old_selector);
 	new_volt = rdev->desc->min_uV + (rdev->desc->uV_step * new_selector);

 	return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
 }

 static int s2mpa01_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 {
 	struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
 	unsigned int ramp_val, ramp_shift, ramp_reg = S2MPA01_REG_RAMP2;
 	unsigned int ramp_enable = 1, enable_shift = 0;
 	int ret;

 	switch (rdev->desc->id) {
 	case S2MPA01_BUCK1:
 		enable_shift = S2MPA01_BUCK1_RAMP_EN_SHIFT;
 		if (!ramp_delay) {
 			ramp_enable = 0;
 			break;
 		}

 		if (ramp_delay > s2mpa01->ramp_delay16)
 			s2mpa01->ramp_delay16 = ramp_delay;
 		else
 			ramp_delay = s2mpa01->ramp_delay16;

 		ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
 		ramp_reg = S2MPA01_REG_RAMP1;
 		break;
 	case S2MPA01_BUCK2:
 		enable_shift = S2MPA01_BUCK2_RAMP_EN_SHIFT;
 		if (!ramp_delay) {
 			ramp_enable = 0;
 			break;
 		}

 		if (ramp_delay > s2mpa01->ramp_delay24)
 			s2mpa01->ramp_delay24 = ramp_delay;
 		else
 			ramp_delay = s2mpa01->ramp_delay24;

 		ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
 		ramp_reg = S2MPA01_REG_RAMP1;
 		break;
 	case S2MPA01_BUCK3:
 		enable_shift = S2MPA01_BUCK3_RAMP_EN_SHIFT;
 		if (!ramp_delay) {
 			ramp_enable = 0;
 			break;
 		}

 		s2mpa01->ramp_delay3 = ramp_delay;
 		ramp_shift = S2MPA01_BUCK3_RAMP_SHIFT;
 		ramp_reg = S2MPA01_REG_RAMP1;
 		break;
 	case S2MPA01_BUCK4:
 		enable_shift = S2MPA01_BUCK4_RAMP_EN_SHIFT;
 		if (!ramp_delay) {
 			ramp_enable = 0;
 			break;
 		}

 		if (ramp_delay > s2mpa01->ramp_delay24)
 			s2mpa01->ramp_delay24 = ramp_delay;
 		else
 			ramp_delay = s2mpa01->ramp_delay24;

 		ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
 		ramp_reg = S2MPA01_REG_RAMP1;
 		break;
 	case S2MPA01_BUCK5:
 		s2mpa01->ramp_delay5 = ramp_delay;
 		ramp_shift = S2MPA01_BUCK5_RAMP_SHIFT;
 		break;
 	case S2MPA01_BUCK6:
 		if (ramp_delay > s2mpa01->ramp_delay16)
 			s2mpa01->ramp_delay16 = ramp_delay;
 		else
 			ramp_delay = s2mpa01->ramp_delay16;

 		ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
 		break;
 	case S2MPA01_BUCK7:
 		s2mpa01->ramp_delay7 = ramp_delay;
 		ramp_shift = S2MPA01_BUCK7_RAMP_SHIFT;
 		break;
 	case S2MPA01_BUCK8:
 	case S2MPA01_BUCK9:
 	case S2MPA01_BUCK10:
 		if (ramp_delay > s2mpa01->ramp_delay8910)
 			s2mpa01->ramp_delay8910 = ramp_delay;
 		else
 			ramp_delay = s2mpa01->ramp_delay8910;

 		ramp_shift = S2MPA01_BUCK8910_RAMP_SHIFT;
 		break;
 	default:
 		return 0;
 	}

 	if (!ramp_enable)
 		goto ramp_disable;

 	ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
 				 1 << enable_shift, 1 << enable_shift);
 	if (ret) {
 		dev_err(&rdev->dev, "failed to enable ramp rate\n");
 		return ret;
 	}

 	ramp_val = get_ramp_delay(ramp_delay);

 	return regmap_update_bits(rdev->regmap, ramp_reg, 0x3 << ramp_shift,
 				  ramp_val << ramp_shift);

 ramp_disable:
 	return regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
 				  1 << enable_shift, 0);
 }

 static struct regulator_ops s2mpa01_ldo_ops = {
 	.list_voltage		= regulator_list_voltage_linear,
 	.map_voltage		= regulator_map_voltage_linear,
 	.is_enabled		= regulator_is_enabled_regmap,
 	.enable			= regulator_enable_regmap,
 	.disable		= regulator_disable_regmap,
 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
 };

 static struct regulator_ops s2mpa01_buck_ops = {
 	.list_voltage		= regulator_list_voltage_linear,
 	.map_voltage		= regulator_map_voltage_linear,
 	.is_enabled		= regulator_is_enabled_regmap,
 	.enable			= regulator_enable_regmap,
 	.disable		= regulator_disable_regmap,
 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 	.set_voltage_time_sel	= s2mpa01_regulator_set_voltage_time_sel,
 	.set_ramp_delay		= s2mpa01_set_ramp_delay,
 };

 #define regulator_desc_ldo1(num)	{		\
 	.name		= "LDO"#num,			\
 	.id		= S2MPA01_LDO##num,		\
 	.ops		= &s2mpa01_ldo_ops,		\
 	.type		= REGULATOR_VOLTAGE,		\
 	.owner		= THIS_MODULE,			\
 	.min_uV		= S2MPA01_LDO_MIN,		\
 	.uV_step	= S2MPA01_LDO_STEP1,		\
 	.n_voltages	= S2MPA01_LDO_N_VOLTAGES,	\
 	.vsel_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
 	.vsel_mask	= S2MPA01_LDO_VSEL_MASK,	\
 	.enable_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
 	.enable_mask	= S2MPA01_ENABLE_MASK		\
 }
 #define regulator_desc_ldo2(num)	{		\
 	.name		= "LDO"#num,			\
 	.id		= S2MPA01_LDO##num,		\
 	.ops		= &s2mpa01_ldo_ops,		\
 	.type		= REGULATOR_VOLTAGE,		\
 	.owner		= THIS_MODULE,			\
 	.min_uV		= S2MPA01_LDO_MIN,		\
 	.uV_step	= S2MPA01_LDO_STEP2,		\
 	.n_voltages	= S2MPA01_LDO_N_VOLTAGES,	\
 	.vsel_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
 	.vsel_mask	= S2MPA01_LDO_VSEL_MASK,	\
 	.enable_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
 	.enable_mask	= S2MPA01_ENABLE_MASK		\
 }

 #define regulator_desc_buck1_4(num)	{			\
 	.name		= "BUCK"#num,				\
 	.id		= S2MPA01_BUCK##num,			\
 	.ops		= &s2mpa01_buck_ops,			\
 	.type		= REGULATOR_VOLTAGE,			\
 	.owner		= THIS_MODULE,				\
 	.min_uV		= S2MPA01_BUCK_MIN1,			\
 	.uV_step	= S2MPA01_BUCK_STEP1,			\
 	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
 	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
 	.vsel_reg	= S2MPA01_REG_B1CTRL2 + (num - 1) * 2,	\
 	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
 	.enable_reg	= S2MPA01_REG_B1CTRL1 + (num - 1) * 2,	\
 	.enable_mask	= S2MPA01_ENABLE_MASK			\
 }

 #define regulator_desc_buck5	{				\
 	.name		= "BUCK5",				\
 	.id		= S2MPA01_BUCK5,			\
 	.ops		= &s2mpa01_buck_ops,			\
 	.type		= REGULATOR_VOLTAGE,			\
 	.owner		= THIS_MODULE,				\
 	.min_uV		= S2MPA01_BUCK_MIN2,			\
 	.uV_step	= S2MPA01_BUCK_STEP1,			\
 	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
 	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
 	.vsel_reg	= S2MPA01_REG_B5CTRL2,			\
 	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
 	.enable_reg	= S2MPA01_REG_B5CTRL1,			\
 	.enable_mask	= S2MPA01_ENABLE_MASK			\
 }

 #define regulator_desc_buck6_7(num)	{			\
 	.name		= "BUCK"#num,				\
 	.id		= S2MPA01_BUCK##num,			\
 	.ops		= &s2mpa01_buck_ops,			\
 	.type		= REGULATOR_VOLTAGE,			\
 	.owner		= THIS_MODULE,				\
 	.min_uV		= S2MPA01_BUCK_MIN1,			\
 	.uV_step	= S2MPA01_BUCK_STEP1,			\
 	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
 	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
 	.vsel_reg	= S2MPA01_REG_B6CTRL2 + (num - 6) * 2,	\
 	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
 	.enable_reg	= S2MPA01_REG_B6CTRL1 + (num - 6) * 2,	\
 	.enable_mask	= S2MPA01_ENABLE_MASK			\
 }

 #define regulator_desc_buck8	{				\
 	.name		= "BUCK8",				\
 	.id		= S2MPA01_BUCK8,			\
 	.ops		= &s2mpa01_buck_ops,			\
 	.type		= REGULATOR_VOLTAGE,			\
 	.owner		= THIS_MODULE,				\
 	.min_uV		= S2MPA01_BUCK_MIN2,			\
 	.uV_step	= S2MPA01_BUCK_STEP2,			\
 	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
 	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
 	.vsel_reg	= S2MPA01_REG_B8CTRL2,			\
 	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
 	.enable_reg	= S2MPA01_REG_B8CTRL1,			\
 	.enable_mask	= S2MPA01_ENABLE_MASK			\
 }

 #define regulator_desc_buck9	{				\
 	.name		= "BUCK9",				\
 	.id		= S2MPA01_BUCK9,			\
 	.ops		= &s2mpa01_buck_ops,			\
 	.type		= REGULATOR_VOLTAGE,			\
 	.owner		= THIS_MODULE,				\
 	.min_uV		= S2MPA01_BUCK_MIN4,			\
 	.uV_step	= S2MPA01_BUCK_STEP2,			\
 	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
 	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
 	.vsel_reg	= S2MPA01_REG_B9CTRL2,			\
 	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
 	.enable_reg	= S2MPA01_REG_B9CTRL1,			\
 	.enable_mask	= S2MPA01_ENABLE_MASK			\
 }

 #define regulator_desc_buck10	{				\
 	.name		= "BUCK10",				\
 	.id		= S2MPA01_BUCK10,			\
 	.ops		= &s2mpa01_buck_ops,			\
 	.type		= REGULATOR_VOLTAGE,			\
 	.owner		= THIS_MODULE,				\
 	.min_uV		= S2MPA01_BUCK_MIN3,			\
 	.uV_step	= S2MPA01_BUCK_STEP2,			\
 	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
 	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
 	.vsel_reg	= S2MPA01_REG_B10CTRL2,			\
 	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
 	.enable_reg	= S2MPA01_REG_B10CTRL1,			\
 	.enable_mask	= S2MPA01_ENABLE_MASK			\
 }

 static struct regulator_desc regulators[] = {
 	regulator_desc_ldo2(1),
 	regulator_desc_ldo1(2),
 	regulator_desc_ldo1(3),
 	regulator_desc_ldo1(4),
 	regulator_desc_ldo1(5),
 	regulator_desc_ldo2(6),
 	regulator_desc_ldo1(7),
 	regulator_desc_ldo1(8),
 	regulator_desc_ldo1(9),
 	regulator_desc_ldo1(10),
 	regulator_desc_ldo2(11),
 	regulator_desc_ldo1(12),
 	regulator_desc_ldo1(13),
 	regulator_desc_ldo1(14),
 	regulator_desc_ldo1(15),
 	regulator_desc_ldo1(16),
 	regulator_desc_ldo1(17),
 	regulator_desc_ldo1(18),
 	regulator_desc_ldo1(19),
 	regulator_desc_ldo1(20),
 	regulator_desc_ldo1(21),
 	regulator_desc_ldo2(22),
 	regulator_desc_ldo2(23),
 	regulator_desc_ldo1(24),
 	regulator_desc_ldo1(25),
 	regulator_desc_ldo1(26),
 	regulator_desc_buck1_4(1),
 	regulator_desc_buck1_4(2),
 	regulator_desc_buck1_4(3),
 	regulator_desc_buck1_4(4),
 	regulator_desc_buck5,
 	regulator_desc_buck6_7(6),
 	regulator_desc_buck6_7(7),
 	regulator_desc_buck8,
 	regulator_desc_buck9,
 	regulator_desc_buck10,
 };

 static int s2mpa01_pmic_probe(struct platform_device *pdev)
 {
 	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
 	struct of_regulator_match rdata[S2MPA01_REGULATOR_MAX];
 	struct device_node *reg_np = NULL;
 	struct regulator_config config = { };
 	struct s2mpa01_info *s2mpa01;
 	int i;

 	s2mpa01 = devm_kzalloc(&pdev->dev, sizeof(*s2mpa01), GFP_KERNEL);
 	if (!s2mpa01)
 		return -ENOMEM;

 	for (i = 0; i < S2MPA01_REGULATOR_CNT; i++)
 		rdata[i].name = regulators[i].name;

 	if (iodev->dev->of_node) {
 		reg_np = of_get_child_by_name(iodev->dev->of_node,
 							"regulators");
 			if (!reg_np) {
 				dev_err(&pdev->dev,
 					"could not find regulators sub-node\n");
 				return -EINVAL;
 			}

 		of_regulator_match(&pdev->dev, reg_np, rdata,
 						S2MPA01_REGULATOR_MAX);
 		of_node_put(reg_np);
 	}

 	platform_set_drvdata(pdev, s2mpa01);

 	config.dev = &pdev->dev;
 	config.regmap = iodev->regmap_pmic;
 	config.driver_data = s2mpa01;

 	for (i = 0; i < S2MPA01_REGULATOR_MAX; i++) {
 		struct regulator_dev *rdev;
 		if (pdata)
 			config.init_data = pdata->regulators[i].initdata;
 		else
 			config.init_data = rdata[i].init_data;

 		if (reg_np)
 			config.of_node = rdata[i].of_node;

 		rdev = devm_regulator_register(&pdev->dev,
 						&regulators[i], &config);
 		if (IS_ERR(rdev)) {
 			dev_err(&pdev->dev, "regulator init failed for %d\n",
 				i);
 			return PTR_ERR(rdev);
 		}
 	}

 	return 0;
 }

 static const struct platform_device_id s2mpa01_pmic_id[] = {
 	{ "s2mpa01-pmic", 0},
 	{ },
 };
 MODULE_DEVICE_TABLE(platform, s2mpa01_pmic_id);

 static struct platform_driver s2mpa01_pmic_driver = {
 	.driver = {
 		.name = "s2mpa01-pmic",
 		.owner = THIS_MODULE,
 	},
 	.probe = s2mpa01_pmic_probe,
 	.id_table = s2mpa01_pmic_id,
 };

 module_platform_driver(s2mpa01_pmic_driver);

 /* Module information */
 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 MODULE_AUTHOR("Sachin Kamat <sachin.kamat@samsung.com>");
 MODULE_DESCRIPTION("SAMSUNG S2MPA01 Regulator Driver");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (c) 2013 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/err.h>
	#include <linux/gpio.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/regmap.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/regulator/of_regulator.h>
	#include <linux/mfd/samsung/core.h>
	#include <linux/mfd/samsung/s2mpa01.h>

	#define S2MPA01_REGULATOR_CNT ARRAY_SIZE(regulators)

	struct s2mpa01_info {
	int ramp_delay24;
	int ramp_delay3;
	int ramp_delay5;
	int ramp_delay16;
	int ramp_delay7;
	int ramp_delay8910;
	};

	static int get_ramp_delay(int ramp_delay)
	{
	unsigned char cnt = 0;

	ramp_delay /= 6250;

	while (true) {
	ramp_delay = ramp_delay >> 1;
	if (ramp_delay == 0)
	break;
	cnt++;
	}

	if (cnt > 3)
	cnt = 3;

	return cnt;
	}

	static int s2mpa01_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
	unsigned int old_selector,
	unsigned int new_selector)
	{
	struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
	unsigned int ramp_delay = 0;
	int old_volt, new_volt;

	switch (rdev->desc->id) {
	case S2MPA01_BUCK2:
	case S2MPA01_BUCK4:
	ramp_delay = s2mpa01->ramp_delay24;
	break;
	case S2MPA01_BUCK3:
	ramp_delay = s2mpa01->ramp_delay3;
	break;
	case S2MPA01_BUCK5:
	ramp_delay = s2mpa01->ramp_delay5;
	break;
	case S2MPA01_BUCK1:
	case S2MPA01_BUCK6:
	ramp_delay = s2mpa01->ramp_delay16;
	break;
	case S2MPA01_BUCK7:
	ramp_delay = s2mpa01->ramp_delay7;
	break;
	case S2MPA01_BUCK8:
	case S2MPA01_BUCK9:
	case S2MPA01_BUCK10:
	ramp_delay = s2mpa01->ramp_delay8910;
	break;
	}

	if (ramp_delay == 0)
	ramp_delay = rdev->desc->ramp_delay;

	old_volt = rdev->desc->min_uV + (rdev->desc->uV_step * old_selector);
	new_volt = rdev->desc->min_uV + (rdev->desc->uV_step * new_selector);

	return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
	}

	static int s2mpa01_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
	{
	struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
	unsigned int ramp_val, ramp_shift, ramp_reg = S2MPA01_REG_RAMP2;
	unsigned int ramp_enable = 1, enable_shift = 0;
	int ret;

	switch (rdev->desc->id) {
	case S2MPA01_BUCK1:
	enable_shift = S2MPA01_BUCK1_RAMP_EN_SHIFT;
	if (!ramp_delay) {
	ramp_enable = 0;
	break;
	}

	if (ramp_delay > s2mpa01->ramp_delay16)
	s2mpa01->ramp_delay16 = ramp_delay;
	else
	ramp_delay = s2mpa01->ramp_delay16;

	ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
	ramp_reg = S2MPA01_REG_RAMP1;
	break;
	case S2MPA01_BUCK2:
	enable_shift = S2MPA01_BUCK2_RAMP_EN_SHIFT;
	if (!ramp_delay) {
	ramp_enable = 0;
	break;
	}

	if (ramp_delay > s2mpa01->ramp_delay24)
	s2mpa01->ramp_delay24 = ramp_delay;
	else
	ramp_delay = s2mpa01->ramp_delay24;

	ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
	ramp_reg = S2MPA01_REG_RAMP1;
	break;
	case S2MPA01_BUCK3:
	enable_shift = S2MPA01_BUCK3_RAMP_EN_SHIFT;
	if (!ramp_delay) {
	ramp_enable = 0;
	break;
	}

	s2mpa01->ramp_delay3 = ramp_delay;
	ramp_shift = S2MPA01_BUCK3_RAMP_SHIFT;
	ramp_reg = S2MPA01_REG_RAMP1;
	break;
	case S2MPA01_BUCK4:
	enable_shift = S2MPA01_BUCK4_RAMP_EN_SHIFT;
	if (!ramp_delay) {
	ramp_enable = 0;
	break;
	}

	if (ramp_delay > s2mpa01->ramp_delay24)
	s2mpa01->ramp_delay24 = ramp_delay;
	else
	ramp_delay = s2mpa01->ramp_delay24;

	ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
	ramp_reg = S2MPA01_REG_RAMP1;
	break;
	case S2MPA01_BUCK5:
	s2mpa01->ramp_delay5 = ramp_delay;
	ramp_shift = S2MPA01_BUCK5_RAMP_SHIFT;
	break;
	case S2MPA01_BUCK6:
	if (ramp_delay > s2mpa01->ramp_delay16)
	s2mpa01->ramp_delay16 = ramp_delay;
	else
	ramp_delay = s2mpa01->ramp_delay16;

	ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
	break;
	case S2MPA01_BUCK7:
	s2mpa01->ramp_delay7 = ramp_delay;
	ramp_shift = S2MPA01_BUCK7_RAMP_SHIFT;
	break;
	case S2MPA01_BUCK8:
	case S2MPA01_BUCK9:
	case S2MPA01_BUCK10:
	if (ramp_delay > s2mpa01->ramp_delay8910)
	s2mpa01->ramp_delay8910 = ramp_delay;
	else
	ramp_delay = s2mpa01->ramp_delay8910;

	ramp_shift = S2MPA01_BUCK8910_RAMP_SHIFT;
	break;
	default:
	return 0;
	}

	if (!ramp_enable)
	goto ramp_disable;

	ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
	1 << enable_shift, 1 << enable_shift);
	if (ret) {
	dev_err(&rdev->dev, "failed to enable ramp rate\n");
	return ret;
	}

	ramp_val = get_ramp_delay(ramp_delay);

	return regmap_update_bits(rdev->regmap, ramp_reg, 0x3 << ramp_shift,
	ramp_val << ramp_shift);

	ramp_disable:
	return regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
	1 << enable_shift, 0);
	}

	static struct regulator_ops s2mpa01_ldo_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	};

	static struct regulator_ops s2mpa01_buck_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.set_voltage_time_sel = s2mpa01_regulator_set_voltage_time_sel,
	.set_ramp_delay = s2mpa01_set_ramp_delay,
	};

	#define regulator_desc_ldo1(num) { \
	.name = "LDO"#num, \
	.id = S2MPA01_LDO##num, \
	.ops = &s2mpa01_ldo_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = S2MPA01_LDO_MIN, \
	.uV_step = S2MPA01_LDO_STEP1, \
	.n_voltages = S2MPA01_LDO_N_VOLTAGES, \
	.vsel_reg = S2MPA01_REG_L1CTRL + num - 1, \
	.vsel_mask = S2MPA01_LDO_VSEL_MASK, \
	.enable_reg = S2MPA01_REG_L1CTRL + num - 1, \
	.enable_mask = S2MPA01_ENABLE_MASK \
	}
	#define regulator_desc_ldo2(num) { \
	.name = "LDO"#num, \
	.id = S2MPA01_LDO##num, \
	.ops = &s2mpa01_ldo_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = S2MPA01_LDO_MIN, \
	.uV_step = S2MPA01_LDO_STEP2, \
	.n_voltages = S2MPA01_LDO_N_VOLTAGES, \
	.vsel_reg = S2MPA01_REG_L1CTRL + num - 1, \
	.vsel_mask = S2MPA01_LDO_VSEL_MASK, \
	.enable_reg = S2MPA01_REG_L1CTRL + num - 1, \
	.enable_mask = S2MPA01_ENABLE_MASK \
	}

	#define regulator_desc_buck1_4(num) { \
	.name = "BUCK"#num, \
	.id = S2MPA01_BUCK##num, \
	.ops = &s2mpa01_buck_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = S2MPA01_BUCK_MIN1, \
	.uV_step = S2MPA01_BUCK_STEP1, \
	.n_voltages = S2MPA01_BUCK_N_VOLTAGES, \
	.ramp_delay = S2MPA01_RAMP_DELAY, \
	.vsel_reg = S2MPA01_REG_B1CTRL2 + (num - 1) * 2, \
	.vsel_mask = S2MPA01_BUCK_VSEL_MASK, \
	.enable_reg = S2MPA01_REG_B1CTRL1 + (num - 1) * 2, \
	.enable_mask = S2MPA01_ENABLE_MASK \
	}

	#define regulator_desc_buck5 { \
	.name = "BUCK5", \
	.id = S2MPA01_BUCK5, \
	.ops = &s2mpa01_buck_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = S2MPA01_BUCK_MIN2, \
	.uV_step = S2MPA01_BUCK_STEP1, \
	.n_voltages = S2MPA01_BUCK_N_VOLTAGES, \
	.ramp_delay = S2MPA01_RAMP_DELAY, \
	.vsel_reg = S2MPA01_REG_B5CTRL2, \
	.vsel_mask = S2MPA01_BUCK_VSEL_MASK, \
	.enable_reg = S2MPA01_REG_B5CTRL1, \
	.enable_mask = S2MPA01_ENABLE_MASK \
	}

	#define regulator_desc_buck6_7(num) { \
	.name = "BUCK"#num, \
	.id = S2MPA01_BUCK##num, \
	.ops = &s2mpa01_buck_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = S2MPA01_BUCK_MIN1, \
	.uV_step = S2MPA01_BUCK_STEP1, \
	.n_voltages = S2MPA01_BUCK_N_VOLTAGES, \
	.ramp_delay = S2MPA01_RAMP_DELAY, \
	.vsel_reg = S2MPA01_REG_B6CTRL2 + (num - 6) * 2, \
	.vsel_mask = S2MPA01_BUCK_VSEL_MASK, \
	.enable_reg = S2MPA01_REG_B6CTRL1 + (num - 6) * 2, \
	.enable_mask = S2MPA01_ENABLE_MASK \
	}

	#define regulator_desc_buck8 { \
	.name = "BUCK8", \
	.id = S2MPA01_BUCK8, \
	.ops = &s2mpa01_buck_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = S2MPA01_BUCK_MIN2, \
	.uV_step = S2MPA01_BUCK_STEP2, \
	.n_voltages = S2MPA01_BUCK_N_VOLTAGES, \
	.ramp_delay = S2MPA01_RAMP_DELAY, \
	.vsel_reg = S2MPA01_REG_B8CTRL2, \
	.vsel_mask = S2MPA01_BUCK_VSEL_MASK, \
	.enable_reg = S2MPA01_REG_B8CTRL1, \
	.enable_mask = S2MPA01_ENABLE_MASK \
	}

	#define regulator_desc_buck9 { \
	.name = "BUCK9", \
	.id = S2MPA01_BUCK9, \
	.ops = &s2mpa01_buck_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = S2MPA01_BUCK_MIN4, \
	.uV_step = S2MPA01_BUCK_STEP2, \
	.n_voltages = S2MPA01_BUCK_N_VOLTAGES, \
	.ramp_delay = S2MPA01_RAMP_DELAY, \
	.vsel_reg = S2MPA01_REG_B9CTRL2, \
	.vsel_mask = S2MPA01_BUCK_VSEL_MASK, \
	.enable_reg = S2MPA01_REG_B9CTRL1, \
	.enable_mask = S2MPA01_ENABLE_MASK \
	}

	#define regulator_desc_buck10 { \
	.name = "BUCK10", \
	.id = S2MPA01_BUCK10, \
	.ops = &s2mpa01_buck_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = S2MPA01_BUCK_MIN3, \
	.uV_step = S2MPA01_BUCK_STEP2, \
	.n_voltages = S2MPA01_BUCK_N_VOLTAGES, \
	.ramp_delay = S2MPA01_RAMP_DELAY, \
	.vsel_reg = S2MPA01_REG_B10CTRL2, \
	.vsel_mask = S2MPA01_BUCK_VSEL_MASK, \
	.enable_reg = S2MPA01_REG_B10CTRL1, \
	.enable_mask = S2MPA01_ENABLE_MASK \
	}

	static struct regulator_desc regulators[] = {
	regulator_desc_ldo2(1),
	regulator_desc_ldo1(2),
	regulator_desc_ldo1(3),
	regulator_desc_ldo1(4),
	regulator_desc_ldo1(5),
	regulator_desc_ldo2(6),
	regulator_desc_ldo1(7),
	regulator_desc_ldo1(8),
	regulator_desc_ldo1(9),
	regulator_desc_ldo1(10),
	regulator_desc_ldo2(11),
	regulator_desc_ldo1(12),
	regulator_desc_ldo1(13),
	regulator_desc_ldo1(14),
	regulator_desc_ldo1(15),
	regulator_desc_ldo1(16),
	regulator_desc_ldo1(17),
	regulator_desc_ldo1(18),
	regulator_desc_ldo1(19),
	regulator_desc_ldo1(20),
	regulator_desc_ldo1(21),
	regulator_desc_ldo2(22),
	regulator_desc_ldo2(23),
	regulator_desc_ldo1(24),
	regulator_desc_ldo1(25),
	regulator_desc_ldo1(26),
	regulator_desc_buck1_4(1),
	regulator_desc_buck1_4(2),
	regulator_desc_buck1_4(3),
	regulator_desc_buck1_4(4),
	regulator_desc_buck5,
	regulator_desc_buck6_7(6),
	regulator_desc_buck6_7(7),
	regulator_desc_buck8,
	regulator_desc_buck9,
	regulator_desc_buck10,
	};

	static int s2mpa01_pmic_probe(struct platform_device *pdev)
	{
	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
	struct of_regulator_match rdata[S2MPA01_REGULATOR_MAX];
	struct device_node *reg_np = NULL;
	struct regulator_config config = { };
	struct s2mpa01_info *s2mpa01;
	int i;

	s2mpa01 = devm_kzalloc(&pdev->dev, sizeof(*s2mpa01), GFP_KERNEL);
	if (!s2mpa01)
	return -ENOMEM;

	for (i = 0; i < S2MPA01_REGULATOR_CNT; i++)
	rdata[i].name = regulators[i].name;

	if (iodev->dev->of_node) {
	reg_np = of_get_child_by_name(iodev->dev->of_node,
	"regulators");
	if (!reg_np) {
	dev_err(&pdev->dev,
	"could not find regulators sub-node\n");
	return -EINVAL;
	}

	of_regulator_match(&pdev->dev, reg_np, rdata,
	S2MPA01_REGULATOR_MAX);
	of_node_put(reg_np);
	}

	platform_set_drvdata(pdev, s2mpa01);

	config.dev = &pdev->dev;
	config.regmap = iodev->regmap_pmic;
	config.driver_data = s2mpa01;

	for (i = 0; i < S2MPA01_REGULATOR_MAX; i++) {
	struct regulator_dev *rdev;
	if (pdata)
	config.init_data = pdata->regulators[i].initdata;
	else
	config.init_data = rdata[i].init_data;

	if (reg_np)
	config.of_node = rdata[i].of_node;

	rdev = devm_regulator_register(&pdev->dev,
	&regulators[i], &config);
	if (IS_ERR(rdev)) {
	dev_err(&pdev->dev, "regulator init failed for %d\n",
	i);
	return PTR_ERR(rdev);
	}
	}

	return 0;
	}

	static const struct platform_device_id s2mpa01_pmic_id[] = {
	{ "s2mpa01-pmic", 0},
	{ },
	};
	MODULE_DEVICE_TABLE(platform, s2mpa01_pmic_id);

	static struct platform_driver s2mpa01_pmic_driver = {
	.driver = {
	.name = "s2mpa01-pmic",
	.owner = THIS_MODULE,
	},
	.probe = s2mpa01_pmic_probe,
	.id_table = s2mpa01_pmic_id,
	};

	module_platform_driver(s2mpa01_pmic_driver);

	/* Module information */
	MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
	MODULE_AUTHOR("Sachin Kamat <sachin.kamat@samsung.com>");
	MODULE_DESCRIPTION("SAMSUNG S2MPA01 Regulator Driver");
	MODULE_LICENSE("GPL");