[linux-2.6-block.git] / drivers / regulator / tps51632-regulator.c

/*
 * 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");
Commit	Line	Data
0c570674 LD	1	/*
	2	* tps51632-regulator.c -- TI TPS51632
	3	*
	4	* Regulator driver for TPS51632 3-2-1 Phase D-Cap Step Down Driverless
	5	* Controller with serial VID control and DVFS.
	6	*
	7	* Copyright (c) 2012, NVIDIA Corporation.
	8	*
	9	* Author: Laxman Dewangan <ldewangan@nvidia.com>
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License as
	13	* published by the Free Software Foundation version 2.
	14	*
	15	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	16	* whether express or implied; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	23	* 02111-1307, USA
	24	*/
	25
	26	#include <linux/err.h>
	27	#include <linux/i2c.h>
	28	#include <linux/init.h>
	29	#include <linux/kernel.h>
	30	#include <linux/module.h>
c51ce403 LD	31	#include <linux/of.h>
c51ce403 LD	32	#include <linux/of_device.h>
0c570674 LD	33	#include <linux/platform_device.h>
	34	#include <linux/regmap.h>
	35	#include <linux/regulator/driver.h>
	36	#include <linux/regulator/machine.h>
c51ce403	37	#include <linux/regulator/of_regulator.h>
0c570674 LD	38	#include <linux/regulator/tps51632-regulator.h>
	39	#include <linux/slab.h>
	40
	41	/* Register definitions */
	42	#define TPS51632_VOLTAGE_SELECT_REG 0x0
	43	#define TPS51632_VOLTAGE_BASE_REG 0x1
	44	#define TPS51632_OFFSET_REG 0x2
	45	#define TPS51632_IMON_REG 0x3
	46	#define TPS51632_VMAX_REG 0x4
	47	#define TPS51632_DVFS_CONTROL_REG 0x5
	48	#define TPS51632_POWER_STATE_REG 0x6
	49	#define TPS51632_SLEW_REGS 0x7
	50	#define TPS51632_FAULT_REG 0x14
	51
	52	#define TPS51632_MAX_REG 0x15
	53
	54	#define TPS51632_VOUT_MASK 0x7F
	55	#define TPS51632_VOUT_OFFSET_MASK 0x1F
	56	#define TPS51632_VMAX_MASK 0x7F
	57	#define TPS51632_VMAX_LOCK 0x80
	58
	59	/* TPS51632_DVFS_CONTROL_REG */
	60	#define TPS51632_DVFS_PWMEN 0x1
	61	#define TPS51632_DVFS_STEP_20 0x2
	62	#define TPS51632_DVFS_VMAX_PG 0x4
	63	#define TPS51632_DVFS_PWMRST 0x8
	64	#define TPS51632_DVFS_OCA_EN 0x10
	65	#define TPS51632_DVFS_FCCM 0x20
	66
	67	/* TPS51632_POWER_STATE_REG */
	68	#define TPS51632_POWER_STATE_MASK 0x03
	69	#define TPS51632_POWER_STATE_MULTI_PHASE_CCM 0x0
	70	#define TPS51632_POWER_STATE_SINGLE_PHASE_CCM 0x1
	71	#define TPS51632_POWER_STATE_SINGLE_PHASE_DCM 0x2
	72
9d9339d3 FE	73	#define TPS51632_MIN_VOLTAGE 500000
	74	#define TPS51632_MAX_VOLTAGE 1520000
	75	#define TPS51632_VOLTAGE_STEP_10mV 10000
	76	#define TPS51632_VOLTAGE_STEP_20mV 20000
0c570674 LD	77	#define TPS51632_MAX_VSEL 0x7F
	78	#define TPS51632_MIN_VSEL 0x19
	79	#define TPS51632_DEFAULT_RAMP_DELAY 6000
	80	#define TPS51632_VOLT_VSEL(uV) \
9d9339d3 FE	81	(DIV_ROUND_UP(uV - TPS51632_MIN_VOLTAGE, \
9d9339d3 FE	82	TPS51632_VOLTAGE_STEP_10mV) + \
0c570674 LD	83	TPS51632_MIN_VSEL)
	84
	85	/* TPS51632 chip information */
	86	struct tps51632_chip {
	87	struct device *dev;
	88	struct regulator_desc desc;
	89	struct regulator_dev *rdev;
	90	struct regmap *regmap;
0c570674 LD	91	};
0c570674 LD	92
0c570674 LD	93	static int tps51632_dcdc_set_ramp_delay(struct regulator_dev *rdev,
	94	int ramp_delay)
	95	{
	96	struct tps51632_chip *tps = rdev_get_drvdata(rdev);
c714a588	97	int bit;
0c570674 LD	98	int ret;
0c570674 LD	99
c714a588 AL	100	if (ramp_delay == 0)
	101	bit = 0;
	102	else
	103	bit = DIV_ROUND_UP(ramp_delay, 6000) - 1;
	104
0c570674 LD	105	ret = regmap_write(tps->regmap, TPS51632_SLEW_REGS, BIT(bit));
	106	if (ret < 0)
	107	dev_err(tps->dev, "SLEW reg write failed, err %d\n", ret);
	108	return ret;
	109	}
	110
	111	static struct regulator_ops tps51632_dcdc_ops = {
d94d9aca AL	112	.get_voltage_sel = regulator_get_voltage_sel_regmap,
d94d9aca AL	113	.set_voltage_sel = regulator_set_voltage_sel_regmap,
0c570674 LD	114	.list_voltage = regulator_list_voltage_linear,
	115	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	116	.set_ramp_delay = tps51632_dcdc_set_ramp_delay,
	117	};
	118
a5023574	119	static int tps51632_init_dcdc(struct tps51632_chip *tps,
0c570674 LD	120	struct tps51632_regulator_platform_data *pdata)
	121	{
	122	int ret;
	123	uint8_t control = 0;
	124	int vsel;
	125
	126	if (!pdata->enable_pwm_dvfs)
	127	goto skip_pwm_config;
	128
	129	control \|= TPS51632_DVFS_PWMEN;
0c570674 LD	130	vsel = TPS51632_VOLT_VSEL(pdata->base_voltage_uV);
	131	ret = regmap_write(tps->regmap, TPS51632_VOLTAGE_BASE_REG, vsel);
	132	if (ret < 0) {
	133	dev_err(tps->dev, "BASE reg write failed, err %d\n", ret);
	134	return ret;
	135	}
	136
	137	if (pdata->dvfs_step_20mV)
	138	control \|= TPS51632_DVFS_STEP_20;
	139
	140	if (pdata->max_voltage_uV) {
	141	unsigned int vmax;
	142	/**
	143	* TPS51632 hw behavior: VMAX register can be write only
	144	* once as it get locked after first write. The lock get
	145	* reset only when device is power-reset.
	146	* Write register only when lock bit is not enabled.
	147	*/
	148	ret = regmap_read(tps->regmap, TPS51632_VMAX_REG, &vmax);
	149	if (ret < 0) {
	150	dev_err(tps->dev, "VMAX read failed, err %d\n", ret);
	151	return ret;
	152	}
	153	if (!(vmax & TPS51632_VMAX_LOCK)) {
	154	vsel = TPS51632_VOLT_VSEL(pdata->max_voltage_uV);
	155	ret = regmap_write(tps->regmap, TPS51632_VMAX_REG,
	156	vsel);
	157	if (ret < 0) {
	158	dev_err(tps->dev,
	159	"VMAX write failed, err %d\n", ret);
	160	return ret;
	161	}
	162	}
	163	}
	164
	165	skip_pwm_config:
	166	ret = regmap_write(tps->regmap, TPS51632_DVFS_CONTROL_REG, control);
	167	if (ret < 0)
	168	dev_err(tps->dev, "DVFS reg write failed, err %d\n", ret);
	169	return ret;
	170	}
	171
faa3b2d5	172	static bool is_volatile_reg(struct device *dev, unsigned int reg)
0c570674	173	{
faa3b2d5 LD	174	switch (reg) {
	175	case TPS51632_OFFSET_REG:
	176	case TPS51632_FAULT_REG:
	177	case TPS51632_IMON_REG:
	178	return true;
	179	default:
0c570674	180	return false;
faa3b2d5 LD	181	}
	182	}
	183
	184	static bool is_read_reg(struct device *dev, unsigned int reg)
	185	{
	186	switch (reg) {
	187	case 0x08 ... 0x0F:
	188	return false;
	189	default:
	190	return true;
	191	}
	192	}
	193
	194	static bool is_write_reg(struct device *dev, unsigned int reg)
	195	{
	196	switch (reg) {
	197	case TPS51632_VOLTAGE_SELECT_REG:
	198	case TPS51632_VOLTAGE_BASE_REG:
	199	case TPS51632_VMAX_REG:
	200	case TPS51632_DVFS_CONTROL_REG:
	201	case TPS51632_POWER_STATE_REG:
	202	case TPS51632_SLEW_REGS:
	203	return true;
	204	default:
	205	return false;
	206	}
0c570674 LD	207	}
	208
	209	static const struct regmap_config tps51632_regmap_config = {
	210	.reg_bits = 8,
	211	.val_bits = 8,
faa3b2d5 LD	212	.writeable_reg = is_write_reg,
	213	.readable_reg = is_read_reg,
	214	.volatile_reg = is_volatile_reg,
0c570674 LD	215	.max_register = TPS51632_MAX_REG - 1,
	216	.cache_type = REGCACHE_RBTREE,
	217	};
	218
c51ce403 LD	219	#if defined(CONFIG_OF)
	220	static const struct of_device_id tps51632_of_match[] = {
	221	{ .compatible = "ti,tps51632",},
	222	{},
	223	};
	224	MODULE_DEVICE_TABLE(of, tps51632_of_match);
	225
	226	static struct tps51632_regulator_platform_data *
072e78b1 JMC	227	of_get_tps51632_platform_data(struct device *dev,
072e78b1 JMC	228	const struct regulator_desc *desc)
c51ce403 LD	229	{
	230	struct tps51632_regulator_platform_data *pdata;
	231	struct device_node *np = dev->of_node;
	232
	233	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
ef4bcf88	234	if (!pdata)
c51ce403	235	return NULL;
c51ce403	236
072e78b1 JMC	237	pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node,
072e78b1 JMC	238	desc);
c51ce403 LD	239	if (!pdata->reg_init_data) {
	240	dev_err(dev, "Not able to get OF regulator init data\n");
	241	return NULL;
	242	}
	243
	244	pdata->enable_pwm_dvfs =
	245	of_property_read_bool(np, "ti,enable-pwm-dvfs");
	246	pdata->dvfs_step_20mV = of_property_read_bool(np, "ti,dvfs-step-20mV");
	247
	248	pdata->base_voltage_uV = pdata->reg_init_data->constraints.min_uV ? :
9d9339d3	249	TPS51632_MIN_VOLTAGE;
c51ce403	250	pdata->max_voltage_uV = pdata->reg_init_data->constraints.max_uV ? :
9d9339d3	251	TPS51632_MAX_VOLTAGE;
c51ce403 LD	252	return pdata;
	253	}
	254	#else
	255	static struct tps51632_regulator_platform_data *
072e78b1 JMC	256	of_get_tps51632_platform_data(struct device *dev,
072e78b1 JMC	257	const struct regulator_desc *desc)
c51ce403 LD	258	{
	259	return NULL;
	260	}
	261	#endif
	262
a5023574	263	static int tps51632_probe(struct i2c_client *client,
0c570674 LD	264	const struct i2c_device_id *id)
	265	{
	266	struct tps51632_regulator_platform_data *pdata;
	267	struct regulator_dev *rdev;
	268	struct tps51632_chip *tps;
	269	int ret;
	270	struct regulator_config config = { };
	271
c51ce403 LD	272	if (client->dev.of_node) {
	273	const struct of_device_id *match;
	274	match = of_match_device(of_match_ptr(tps51632_of_match),
	275	&client->dev);
	276	if (!match) {
	277	dev_err(&client->dev, "Error: No device match found\n");
	278	return -ENODEV;
	279	}
	280	}
	281
072e78b1 JMC	282	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
	283	if (!tps)
	284	return -ENOMEM;
	285
	286	tps->dev = &client->dev;
	287	tps->desc.name = client->name;
	288	tps->desc.id = 0;
	289	tps->desc.ramp_delay = TPS51632_DEFAULT_RAMP_DELAY;
	290	tps->desc.min_uV = TPS51632_MIN_VOLTAGE;
	291	tps->desc.uV_step = TPS51632_VOLTAGE_STEP_10mV;
	292	tps->desc.linear_min_sel = TPS51632_MIN_VSEL;
	293	tps->desc.n_voltages = TPS51632_MAX_VSEL + 1;
	294	tps->desc.ops = &tps51632_dcdc_ops;
	295	tps->desc.type = REGULATOR_VOLTAGE;
	296	tps->desc.owner = THIS_MODULE;
	297
dff91d0b	298	pdata = dev_get_platdata(&client->dev);
c51ce403	299	if (!pdata && client->dev.of_node)
072e78b1	300	pdata = of_get_tps51632_platform_data(&client->dev, &tps->desc);
0c570674 LD	301	if (!pdata) {
	302	dev_err(&client->dev, "No Platform data\n");
	303	return -EINVAL;
	304	}
	305
dbc70518	306	if (pdata->enable_pwm_dvfs) {
9d9339d3 FE	307	if ((pdata->base_voltage_uV < TPS51632_MIN_VOLTAGE) \|\|
9d9339d3 FE	308	(pdata->base_voltage_uV > TPS51632_MAX_VOLTAGE)) {
dbc70518 AL	309	dev_err(&client->dev, "Invalid base_voltage_uV setting\n");
	310	return -EINVAL;
	311	}
	312
	313	if ((pdata->max_voltage_uV) &&
9d9339d3 FE	314	((pdata->max_voltage_uV < TPS51632_MIN_VOLTAGE) \|\|
9d9339d3 FE	315	(pdata->max_voltage_uV > TPS51632_MAX_VOLTAGE))) {
dbc70518 AL	316	dev_err(&client->dev, "Invalid max_voltage_uV setting\n");
	317	return -EINVAL;
	318	}
	319	}
	320
d94d9aca AL	321	if (pdata->enable_pwm_dvfs)
	322	tps->desc.vsel_reg = TPS51632_VOLTAGE_BASE_REG;
	323	else
	324	tps->desc.vsel_reg = TPS51632_VOLTAGE_SELECT_REG;
	325	tps->desc.vsel_mask = TPS51632_VOUT_MASK;
	326
0c570674 LD	327	tps->regmap = devm_regmap_init_i2c(client, &tps51632_regmap_config);
	328	if (IS_ERR(tps->regmap)) {
	329	ret = PTR_ERR(tps->regmap);
	330	dev_err(&client->dev, "regmap init failed, err %d\n", ret);
	331	return ret;
	332	}
	333	i2c_set_clientdata(client, tps);
	334
	335	ret = tps51632_init_dcdc(tps, pdata);
	336	if (ret < 0) {
	337	dev_err(tps->dev, "Init failed, err = %d\n", ret);
	338	return ret;
	339	}
	340
	341	/* Register the regulators */
	342	config.dev = &client->dev;
	343	config.init_data = pdata->reg_init_data;
	344	config.driver_data = tps;
	345	config.regmap = tps->regmap;
	346	config.of_node = client->dev.of_node;
	347
1084081d	348	rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
0c570674 LD	349	if (IS_ERR(rdev)) {
	350	dev_err(tps->dev, "regulator register failed\n");
	351	return PTR_ERR(rdev);
	352	}
	353
	354	tps->rdev = rdev;
	355	return 0;
	356	}
	357
0c570674 LD	358	static const struct i2c_device_id tps51632_id[] = {
	359	{.name = "tps51632",},
	360	{},
	361	};
	362
	363	MODULE_DEVICE_TABLE(i2c, tps51632_id);
	364
	365	static struct i2c_driver tps51632_i2c_driver = {
	366	.driver = {
	367	.name = "tps51632",
c51ce403	368	.of_match_table = of_match_ptr(tps51632_of_match),
0c570674 LD	369	},
0c570674 LD	370	.probe = tps51632_probe,
0c570674 LD	371	.id_table = tps51632_id,
	372	};
	373
	374	static int __init tps51632_init(void)
	375	{
	376	return i2c_add_driver(&tps51632_i2c_driver);
	377	}
	378	subsys_initcall(tps51632_init);
	379
	380	static void __exit tps51632_cleanup(void)
	381	{
	382	i2c_del_driver(&tps51632_i2c_driver);
	383	}
	384	module_exit(tps51632_cleanup);
	385
	386	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	387	MODULE_DESCRIPTION("TPS51632 voltage regulator driver");
	388	MODULE_LICENSE("GPL v2");