drivers/regulator/tps51632-regulator.c - third_party/linux - Git at Google

 /*
  * tps51632-regulator.c -- TI TPS51632
  *
  * Regulator driver for TPS51632 3-2-1 Phase D-Cap Step Down Driverless
  * Controller with serial VID control and DVFS.
  *
  * Copyright (c) 2012, NVIDIA Corporation.
  *
  * Author: Laxman Dewangan <ldewangan@nvidia.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 version 2.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
  * whether express or implied; 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/err.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/regulator/tps51632-regulator.h>
 #include <linux/slab.h>

 /* Register definitions */
 #define TPS51632_VOLTAGE_SELECT_REG		0x0
 #define TPS51632_VOLTAGE_BASE_REG		0x1
 #define TPS51632_OFFSET_REG			0x2
 #define TPS51632_IMON_REG			0x3
 #define TPS51632_VMAX_REG			0x4
 #define TPS51632_DVFS_CONTROL_REG		0x5
 #define TPS51632_POWER_STATE_REG		0x6
 #define TPS51632_SLEW_REGS			0x7
 #define TPS51632_FAULT_REG			0x14

 #define TPS51632_MAX_REG			0x15

 #define TPS51632_VOUT_MASK			0x7F
 #define TPS51632_VOUT_OFFSET_MASK		0x1F
 #define TPS51632_VMAX_MASK			0x7F
 #define TPS51632_VMAX_LOCK			0x80

 /* TPS51632_DVFS_CONTROL_REG */
 #define TPS51632_DVFS_PWMEN			0x1
 #define TPS51632_DVFS_STEP_20			0x2
 #define TPS51632_DVFS_VMAX_PG			0x4
 #define TPS51632_DVFS_PWMRST			0x8
 #define TPS51632_DVFS_OCA_EN			0x10
 #define TPS51632_DVFS_FCCM			0x20

 /* TPS51632_POWER_STATE_REG */
 #define TPS51632_POWER_STATE_MASK		0x03
 #define TPS51632_POWER_STATE_MULTI_PHASE_CCM	0x0
 #define TPS51632_POWER_STATE_SINGLE_PHASE_CCM	0x1
 #define TPS51632_POWER_STATE_SINGLE_PHASE_DCM	0x2

 #define TPS51632_MIN_VOLTAGE			500000
 #define TPS51632_MAX_VOLTAGE			1520000
 #define TPS51632_VOLTAGE_STEP_10mV		10000
 #define TPS51632_VOLTAGE_STEP_20mV		20000
 #define TPS51632_MAX_VSEL			0x7F
 #define TPS51632_MIN_VSEL			0x19
 #define TPS51632_DEFAULT_RAMP_DELAY		6000
 #define TPS51632_VOLT_VSEL(uV)					\
 		(DIV_ROUND_UP(uV - TPS51632_MIN_VOLTAGE,	\
 			TPS51632_VOLTAGE_STEP_10mV) +		\
 			TPS51632_MIN_VSEL)

 /* TPS51632 chip information */
 struct tps51632_chip {
 	struct device *dev;
 	struct regulator_desc desc;
 	struct regulator_dev *rdev;
 	struct regmap *regmap;
 };

 static int tps51632_dcdc_set_ramp_delay(struct regulator_dev *rdev,
 		int ramp_delay)
 {
 	struct tps51632_chip *tps = rdev_get_drvdata(rdev);
 	int bit;
 	int ret;

 	if (ramp_delay == 0)
 		bit = 0;
 	else
 		bit = DIV_ROUND_UP(ramp_delay, 6000) - 1;

 	ret = regmap_write(tps->regmap, TPS51632_SLEW_REGS, BIT(bit));
 	if (ret < 0)
 		dev_err(tps->dev, "SLEW reg write failed, err %d\n", ret);
 	return ret;
 }

 static struct regulator_ops tps51632_dcdc_ops = {
 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 	.list_voltage		= regulator_list_voltage_linear,
 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
 	.set_ramp_delay		= tps51632_dcdc_set_ramp_delay,
 };

 static int tps51632_init_dcdc(struct tps51632_chip *tps,
 		struct tps51632_regulator_platform_data *pdata)
 {
 	int ret;
 	uint8_t	control = 0;
 	int vsel;

 	if (!pdata->enable_pwm_dvfs)
 		goto skip_pwm_config;

 	control |= TPS51632_DVFS_PWMEN;
 	vsel = TPS51632_VOLT_VSEL(pdata->base_voltage_uV);
 	ret = regmap_write(tps->regmap, TPS51632_VOLTAGE_BASE_REG, vsel);
 	if (ret < 0) {
 		dev_err(tps->dev, "BASE reg write failed, err %d\n", ret);
 		return ret;
 	}

 	if (pdata->dvfs_step_20mV)
 		control |= TPS51632_DVFS_STEP_20;

 	if (pdata->max_voltage_uV) {
 		unsigned int vmax;
 		/**
 		 * TPS51632 hw behavior: VMAX register can be write only
 		 * once as it get locked after first write. The lock get
 		 * reset only when device is power-reset.
 		 * Write register only when lock bit is not enabled.
 		 */
 		ret = regmap_read(tps->regmap, TPS51632_VMAX_REG, &vmax);
 		if (ret < 0) {
 			dev_err(tps->dev, "VMAX read failed, err %d\n", ret);
 			return ret;
 		}
 		if (!(vmax & TPS51632_VMAX_LOCK)) {
 			vsel = TPS51632_VOLT_VSEL(pdata->max_voltage_uV);
 			ret = regmap_write(tps->regmap, TPS51632_VMAX_REG,
 					vsel);
 			if (ret < 0) {
 				dev_err(tps->dev,
 					"VMAX write failed, err %d\n", ret);
 				return ret;
 			}
 		}
 	}

 skip_pwm_config:
 	ret = regmap_write(tps->regmap, TPS51632_DVFS_CONTROL_REG, control);
 	if (ret < 0)
 		dev_err(tps->dev, "DVFS reg write failed, err %d\n", ret);
 	return ret;
 }

 static bool is_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case TPS51632_OFFSET_REG:
 	case TPS51632_FAULT_REG:
 	case TPS51632_IMON_REG:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool is_read_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case 0x08 ... 0x0F:
 		return false;
 	default:
 		return true;
 	}
 }

 static bool is_write_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case TPS51632_VOLTAGE_SELECT_REG:
 	case TPS51632_VOLTAGE_BASE_REG:
 	case TPS51632_VMAX_REG:
 	case TPS51632_DVFS_CONTROL_REG:
 	case TPS51632_POWER_STATE_REG:
 	case TPS51632_SLEW_REGS:
 		return true;
 	default:
 		return false;
 	}
 }

 static const struct regmap_config tps51632_regmap_config = {
 	.reg_bits		= 8,
 	.val_bits		= 8,
 	.writeable_reg		= is_write_reg,
 	.readable_reg		= is_read_reg,
 	.volatile_reg		= is_volatile_reg,
 	.max_register		= TPS51632_MAX_REG - 1,
 	.cache_type		= REGCACHE_RBTREE,
 };

 #if defined(CONFIG_OF)
 static const struct of_device_id tps51632_of_match[] = {
 	{ .compatible = "ti,tps51632",},
 	{},
 };
 MODULE_DEVICE_TABLE(of, tps51632_of_match);

 static struct tps51632_regulator_platform_data *
 	of_get_tps51632_platform_data(struct device *dev,
 				      const struct regulator_desc *desc)
 {
 	struct tps51632_regulator_platform_data *pdata;
 	struct device_node *np = dev->of_node;

 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return NULL;

 	pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node,
 							  desc);
 	if (!pdata->reg_init_data) {
 		dev_err(dev, "Not able to get OF regulator init data\n");
 		return NULL;
 	}

 	pdata->enable_pwm_dvfs =
 			of_property_read_bool(np, "ti,enable-pwm-dvfs");
 	pdata->dvfs_step_20mV = of_property_read_bool(np, "ti,dvfs-step-20mV");

 	pdata->base_voltage_uV = pdata->reg_init_data->constraints.min_uV ? :
 					TPS51632_MIN_VOLTAGE;
 	pdata->max_voltage_uV = pdata->reg_init_data->constraints.max_uV ? :
 					TPS51632_MAX_VOLTAGE;
 	return pdata;
 }
 #else
 static struct tps51632_regulator_platform_data *
 	of_get_tps51632_platform_data(struct device *dev,
 				      const struct regulator_desc *desc)
 {
 	return NULL;
 }
 #endif

 static int tps51632_probe(struct i2c_client *client,
 				const struct i2c_device_id *id)
 {
 	struct tps51632_regulator_platform_data *pdata;
 	struct regulator_dev *rdev;
 	struct tps51632_chip *tps;
 	int ret;
 	struct regulator_config config = { };

 	if (client->dev.of_node) {
 		const struct of_device_id *match;
 		match = of_match_device(of_match_ptr(tps51632_of_match),
 				&client->dev);
 		if (!match) {
 			dev_err(&client->dev, "Error: No device match found\n");
 			return -ENODEV;
 		}
 	}

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

 	tps->dev = &client->dev;
 	tps->desc.name = client->name;
 	tps->desc.id = 0;
 	tps->desc.ramp_delay = TPS51632_DEFAULT_RAMP_DELAY;
 	tps->desc.min_uV = TPS51632_MIN_VOLTAGE;
 	tps->desc.uV_step = TPS51632_VOLTAGE_STEP_10mV;
 	tps->desc.linear_min_sel = TPS51632_MIN_VSEL;
 	tps->desc.n_voltages = TPS51632_MAX_VSEL + 1;
 	tps->desc.ops = &tps51632_dcdc_ops;
 	tps->desc.type = REGULATOR_VOLTAGE;
 	tps->desc.owner = THIS_MODULE;

 	pdata = dev_get_platdata(&client->dev);
 	if (!pdata && client->dev.of_node)
 		pdata = of_get_tps51632_platform_data(&client->dev, &tps->desc);
 	if (!pdata) {
 		dev_err(&client->dev, "No Platform data\n");
 		return -EINVAL;
 	}

 	if (pdata->enable_pwm_dvfs) {
 		if ((pdata->base_voltage_uV < TPS51632_MIN_VOLTAGE) ||
 		    (pdata->base_voltage_uV > TPS51632_MAX_VOLTAGE)) {
 			dev_err(&client->dev, "Invalid base_voltage_uV setting\n");
 			return -EINVAL;
 		}

 		if ((pdata->max_voltage_uV) &&
 		    ((pdata->max_voltage_uV < TPS51632_MIN_VOLTAGE) ||
 		     (pdata->max_voltage_uV > TPS51632_MAX_VOLTAGE))) {
 			dev_err(&client->dev, "Invalid max_voltage_uV setting\n");
 			return -EINVAL;
 		}
 	}

 	if (pdata->enable_pwm_dvfs)
 		tps->desc.vsel_reg = TPS51632_VOLTAGE_BASE_REG;
 	else
 		tps->desc.vsel_reg = TPS51632_VOLTAGE_SELECT_REG;
 	tps->desc.vsel_mask = TPS51632_VOUT_MASK;

 	tps->regmap = devm_regmap_init_i2c(client, &tps51632_regmap_config);
 	if (IS_ERR(tps->regmap)) {
 		ret = PTR_ERR(tps->regmap);
 		dev_err(&client->dev, "regmap init failed, err %d\n", ret);
 		return ret;
 	}
 	i2c_set_clientdata(client, tps);

 	ret = tps51632_init_dcdc(tps, pdata);
 	if (ret < 0) {
 		dev_err(tps->dev, "Init failed, err = %d\n", ret);
 		return ret;
 	}

 	/* Register the regulators */
 	config.dev = &client->dev;
 	config.init_data = pdata->reg_init_data;
 	config.driver_data = tps;
 	config.regmap = tps->regmap;
 	config.of_node = client->dev.of_node;

 	rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
 	if (IS_ERR(rdev)) {
 		dev_err(tps->dev, "regulator register failed\n");
 		return PTR_ERR(rdev);
 	}

 	tps->rdev = rdev;
 	return 0;
 }

 static const struct i2c_device_id tps51632_id[] = {
 	{.name = "tps51632",},
 	{},
 };

 MODULE_DEVICE_TABLE(i2c, tps51632_id);

 static struct i2c_driver tps51632_i2c_driver = {
 	.driver = {
 		.name = "tps51632",
 		.of_match_table = of_match_ptr(tps51632_of_match),
 	},
 	.probe = tps51632_probe,
 	.id_table = tps51632_id,
 };

 static int __init tps51632_init(void)
 {
 	return i2c_add_driver(&tps51632_i2c_driver);
 }
 subsys_initcall(tps51632_init);

 static void __exit tps51632_cleanup(void)
 {
 	i2c_del_driver(&tps51632_i2c_driver);
 }
 module_exit(tps51632_cleanup);

 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 MODULE_DESCRIPTION("TPS51632 voltage regulator driver");
 MODULE_LICENSE("GPL v2");
	/*
	* tps51632-regulator.c -- TI TPS51632
	*
	* Regulator driver for TPS51632 3-2-1 Phase D-Cap Step Down Driverless
	* Controller with serial VID control and DVFS.
	*
	* Copyright (c) 2012, NVIDIA Corporation.
	*
	* Author: Laxman Dewangan <ldewangan@nvidia.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 version 2.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	* whether express or implied; 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/err.h>
	#include <linux/i2c.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/regulator/of_regulator.h>
	#include <linux/regulator/tps51632-regulator.h>
	#include <linux/slab.h>

	/* Register definitions */
	#define TPS51632_VOLTAGE_SELECT_REG 0x0
	#define TPS51632_VOLTAGE_BASE_REG 0x1
	#define TPS51632_OFFSET_REG 0x2
	#define TPS51632_IMON_REG 0x3
	#define TPS51632_VMAX_REG 0x4
	#define TPS51632_DVFS_CONTROL_REG 0x5
	#define TPS51632_POWER_STATE_REG 0x6
	#define TPS51632_SLEW_REGS 0x7
	#define TPS51632_FAULT_REG 0x14

	#define TPS51632_MAX_REG 0x15

	#define TPS51632_VOUT_MASK 0x7F
	#define TPS51632_VOUT_OFFSET_MASK 0x1F
	#define TPS51632_VMAX_MASK 0x7F
	#define TPS51632_VMAX_LOCK 0x80

	/* TPS51632_DVFS_CONTROL_REG */
	#define TPS51632_DVFS_PWMEN 0x1
	#define TPS51632_DVFS_STEP_20 0x2
	#define TPS51632_DVFS_VMAX_PG 0x4
	#define TPS51632_DVFS_PWMRST 0x8
	#define TPS51632_DVFS_OCA_EN 0x10
	#define TPS51632_DVFS_FCCM 0x20

	/* TPS51632_POWER_STATE_REG */
	#define TPS51632_POWER_STATE_MASK 0x03
	#define TPS51632_POWER_STATE_MULTI_PHASE_CCM 0x0
	#define TPS51632_POWER_STATE_SINGLE_PHASE_CCM 0x1
	#define TPS51632_POWER_STATE_SINGLE_PHASE_DCM 0x2

	#define TPS51632_MIN_VOLTAGE 500000
	#define TPS51632_MAX_VOLTAGE 1520000
	#define TPS51632_VOLTAGE_STEP_10mV 10000
	#define TPS51632_VOLTAGE_STEP_20mV 20000
	#define TPS51632_MAX_VSEL 0x7F
	#define TPS51632_MIN_VSEL 0x19
	#define TPS51632_DEFAULT_RAMP_DELAY 6000
	#define TPS51632_VOLT_VSEL(uV) \
	(DIV_ROUND_UP(uV - TPS51632_MIN_VOLTAGE, \
	TPS51632_VOLTAGE_STEP_10mV) + \
	TPS51632_MIN_VSEL)

	/* TPS51632 chip information */
	struct tps51632_chip {
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_dev *rdev;
	struct regmap *regmap;
	};

	static int tps51632_dcdc_set_ramp_delay(struct regulator_dev *rdev,
	int ramp_delay)
	{
	struct tps51632_chip *tps = rdev_get_drvdata(rdev);
	int bit;
	int ret;

	if (ramp_delay == 0)
	bit = 0;
	else
	bit = DIV_ROUND_UP(ramp_delay, 6000) - 1;

	ret = regmap_write(tps->regmap, TPS51632_SLEW_REGS, BIT(bit));
	if (ret < 0)
	dev_err(tps->dev, "SLEW reg write failed, err %d\n", ret);
	return ret;
	}

	static struct regulator_ops tps51632_dcdc_ops = {
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	.set_ramp_delay = tps51632_dcdc_set_ramp_delay,
	};

	static int tps51632_init_dcdc(struct tps51632_chip *tps,
	struct tps51632_regulator_platform_data *pdata)
	{
	int ret;
	uint8_t control = 0;
	int vsel;

	if (!pdata->enable_pwm_dvfs)
	goto skip_pwm_config;

	control \|= TPS51632_DVFS_PWMEN;
	vsel = TPS51632_VOLT_VSEL(pdata->base_voltage_uV);
	ret = regmap_write(tps->regmap, TPS51632_VOLTAGE_BASE_REG, vsel);
	if (ret < 0) {
	dev_err(tps->dev, "BASE reg write failed, err %d\n", ret);
	return ret;
	}

	if (pdata->dvfs_step_20mV)
	control \|= TPS51632_DVFS_STEP_20;

	if (pdata->max_voltage_uV) {
	unsigned int vmax;
	/**
	* TPS51632 hw behavior: VMAX register can be write only
	* once as it get locked after first write. The lock get
	* reset only when device is power-reset.
	* Write register only when lock bit is not enabled.
	*/
	ret = regmap_read(tps->regmap, TPS51632_VMAX_REG, &vmax);
	if (ret < 0) {
	dev_err(tps->dev, "VMAX read failed, err %d\n", ret);
	return ret;
	}
	if (!(vmax & TPS51632_VMAX_LOCK)) {
	vsel = TPS51632_VOLT_VSEL(pdata->max_voltage_uV);
	ret = regmap_write(tps->regmap, TPS51632_VMAX_REG,
	vsel);
	if (ret < 0) {
	dev_err(tps->dev,
	"VMAX write failed, err %d\n", ret);
	return ret;
	}
	}
	}

	skip_pwm_config:
	ret = regmap_write(tps->regmap, TPS51632_DVFS_CONTROL_REG, control);
	if (ret < 0)
	dev_err(tps->dev, "DVFS reg write failed, err %d\n", ret);
	return ret;
	}

	static bool is_volatile_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case TPS51632_OFFSET_REG:
	case TPS51632_FAULT_REG:
	case TPS51632_IMON_REG:
	return true;
	default:
	return false;
	}
	}

	static bool is_read_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case 0x08 ... 0x0F:
	return false;
	default:
	return true;
	}
	}

	static bool is_write_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case TPS51632_VOLTAGE_SELECT_REG:
	case TPS51632_VOLTAGE_BASE_REG:
	case TPS51632_VMAX_REG:
	case TPS51632_DVFS_CONTROL_REG:
	case TPS51632_POWER_STATE_REG:
	case TPS51632_SLEW_REGS:
	return true;
	default:
	return false;
	}
	}

	static const struct regmap_config tps51632_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.writeable_reg = is_write_reg,
	.readable_reg = is_read_reg,
	.volatile_reg = is_volatile_reg,
	.max_register = TPS51632_MAX_REG - 1,
	.cache_type = REGCACHE_RBTREE,
	};

	#if defined(CONFIG_OF)
	static const struct of_device_id tps51632_of_match[] = {
	{ .compatible = "ti,tps51632",},
	{},
	};
	MODULE_DEVICE_TABLE(of, tps51632_of_match);

	static struct tps51632_regulator_platform_data *
	of_get_tps51632_platform_data(struct device *dev,
	const struct regulator_desc *desc)
	{
	struct tps51632_regulator_platform_data *pdata;
	struct device_node *np = dev->of_node;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return NULL;

	pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node,
	desc);
	if (!pdata->reg_init_data) {
	dev_err(dev, "Not able to get OF regulator init data\n");
	return NULL;
	}

	pdata->enable_pwm_dvfs =
	of_property_read_bool(np, "ti,enable-pwm-dvfs");
	pdata->dvfs_step_20mV = of_property_read_bool(np, "ti,dvfs-step-20mV");

	pdata->base_voltage_uV = pdata->reg_init_data->constraints.min_uV ? :
	TPS51632_MIN_VOLTAGE;
	pdata->max_voltage_uV = pdata->reg_init_data->constraints.max_uV ? :
	TPS51632_MAX_VOLTAGE;
	return pdata;
	}
	#else
	static struct tps51632_regulator_platform_data *
	of_get_tps51632_platform_data(struct device *dev,
	const struct regulator_desc *desc)
	{
	return NULL;
	}
	#endif

	static int tps51632_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct tps51632_regulator_platform_data *pdata;
	struct regulator_dev *rdev;
	struct tps51632_chip *tps;
	int ret;
	struct regulator_config config = { };

	if (client->dev.of_node) {
	const struct of_device_id *match;
	match = of_match_device(of_match_ptr(tps51632_of_match),
	&client->dev);
	if (!match) {
	dev_err(&client->dev, "Error: No device match found\n");
	return -ENODEV;
	}
	}

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

	tps->dev = &client->dev;
	tps->desc.name = client->name;
	tps->desc.id = 0;
	tps->desc.ramp_delay = TPS51632_DEFAULT_RAMP_DELAY;
	tps->desc.min_uV = TPS51632_MIN_VOLTAGE;
	tps->desc.uV_step = TPS51632_VOLTAGE_STEP_10mV;
	tps->desc.linear_min_sel = TPS51632_MIN_VSEL;
	tps->desc.n_voltages = TPS51632_MAX_VSEL + 1;
	tps->desc.ops = &tps51632_dcdc_ops;
	tps->desc.type = REGULATOR_VOLTAGE;
	tps->desc.owner = THIS_MODULE;

	pdata = dev_get_platdata(&client->dev);
	if (!pdata && client->dev.of_node)
	pdata = of_get_tps51632_platform_data(&client->dev, &tps->desc);
	if (!pdata) {
	dev_err(&client->dev, "No Platform data\n");
	return -EINVAL;
	}

	if (pdata->enable_pwm_dvfs) {
	if ((pdata->base_voltage_uV < TPS51632_MIN_VOLTAGE) \|\|
	(pdata->base_voltage_uV > TPS51632_MAX_VOLTAGE)) {
	dev_err(&client->dev, "Invalid base_voltage_uV setting\n");
	return -EINVAL;
	}

	if ((pdata->max_voltage_uV) &&
	((pdata->max_voltage_uV < TPS51632_MIN_VOLTAGE) \|\|
	(pdata->max_voltage_uV > TPS51632_MAX_VOLTAGE))) {
	dev_err(&client->dev, "Invalid max_voltage_uV setting\n");
	return -EINVAL;
	}
	}

	if (pdata->enable_pwm_dvfs)
	tps->desc.vsel_reg = TPS51632_VOLTAGE_BASE_REG;
	else
	tps->desc.vsel_reg = TPS51632_VOLTAGE_SELECT_REG;
	tps->desc.vsel_mask = TPS51632_VOUT_MASK;

	tps->regmap = devm_regmap_init_i2c(client, &tps51632_regmap_config);
	if (IS_ERR(tps->regmap)) {
	ret = PTR_ERR(tps->regmap);
	dev_err(&client->dev, "regmap init failed, err %d\n", ret);
	return ret;
	}
	i2c_set_clientdata(client, tps);

	ret = tps51632_init_dcdc(tps, pdata);
	if (ret < 0) {
	dev_err(tps->dev, "Init failed, err = %d\n", ret);
	return ret;
	}

	/* Register the regulators */
	config.dev = &client->dev;
	config.init_data = pdata->reg_init_data;
	config.driver_data = tps;
	config.regmap = tps->regmap;
	config.of_node = client->dev.of_node;

	rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
	if (IS_ERR(rdev)) {
	dev_err(tps->dev, "regulator register failed\n");
	return PTR_ERR(rdev);
	}

	tps->rdev = rdev;
	return 0;
	}

	static const struct i2c_device_id tps51632_id[] = {
	{.name = "tps51632",},
	{},
	};

	MODULE_DEVICE_TABLE(i2c, tps51632_id);

	static struct i2c_driver tps51632_i2c_driver = {
	.driver = {
	.name = "tps51632",
	.of_match_table = of_match_ptr(tps51632_of_match),
	},
	.probe = tps51632_probe,
	.id_table = tps51632_id,
	};

	static int __init tps51632_init(void)
	{
	return i2c_add_driver(&tps51632_i2c_driver);
	}
	subsys_initcall(tps51632_init);

	static void __exit tps51632_cleanup(void)
	{
	i2c_del_driver(&tps51632_i2c_driver);
	}
	module_exit(tps51632_cleanup);

	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	MODULE_DESCRIPTION("TPS51632 voltage regulator driver");
	MODULE_LICENSE("GPL v2");