[linux-block.git] / drivers / regulator / tps62360-regulator.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * tps62360.c -- TI tps62360
 *
 * Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
 *
 * Copyright (c) 2012, NVIDIA Corporation.
 *
 * Author: Laxman Dewangan <ldewangan@nvidia.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regulator/of_regulator.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/tps62360.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/regmap.h>

/* Register definitions */
#define REG_VSET0		0
#define REG_VSET1		1
#define REG_VSET2		2
#define REG_VSET3		3
#define REG_CONTROL		4
#define REG_TEMP		5
#define REG_RAMPCTRL		6
#define REG_CHIPID		8

#define FORCE_PWM_ENABLE	BIT(7)

enum chips {TPS62360, TPS62361, TPS62362, TPS62363};

#define TPS62360_BASE_VOLTAGE	770000
#define TPS62360_N_VOLTAGES	64

#define TPS62361_BASE_VOLTAGE	500000
#define TPS62361_N_VOLTAGES	128

/* tps 62360 chip information */
struct tps62360_chip {
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_dev *rdev;
	struct regmap *regmap;
	struct gpio_desc *vsel0_gpio;
	struct gpio_desc *vsel1_gpio;
	u8 voltage_reg_mask;
	bool en_internal_pulldn;
	bool en_discharge;
	bool valid_gpios;
	int lru_index[4];
	int curr_vset_vsel[4];
	int curr_vset_id;
};

/*
 * find_voltage_set_register: Find new voltage configuration register
 * (VSET) id.
 * The finding of the new VSET register will be based on the LRU mechanism.
 * Each VSET register will have different voltage configured . This
 * Function will look if any of the VSET register have requested voltage set
 * or not.
 *     - If it is already there then it will make that register as most
 *       recently used and return as found so that caller need not to set
 *       the VSET register but need to set the proper gpios to select this
 *       VSET register.
 *     - If requested voltage is not found then it will use the least
 *       recently mechanism to get new VSET register for new configuration
 *       and will return not_found so that caller need to set new VSET
 *       register and then gpios (both).
 */
static bool find_voltage_set_register(struct tps62360_chip *tps,
		int req_vsel, int *vset_reg_id)
{
	int i;
	bool found = false;
	int new_vset_reg = tps->lru_index[3];
	int found_index = 3;

	for (i = 0; i < 4; ++i) {
		if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {
			new_vset_reg = tps->lru_index[i];
			found_index = i;
			found = true;
			goto update_lru_index;
		}
	}

update_lru_index:
	for (i = found_index; i > 0; i--)
		tps->lru_index[i] = tps->lru_index[i - 1];

	tps->lru_index[0] = new_vset_reg;
	*vset_reg_id = new_vset_reg;
	return found;
}

static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev)
{
	struct tps62360_chip *tps = rdev_get_drvdata(dev);
	int vsel;
	unsigned int data;
	int ret;

	ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
	if (ret < 0) {
		dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
			__func__, REG_VSET0 + tps->curr_vset_id, ret);
		return ret;
	}
	vsel = (int)data & tps->voltage_reg_mask;
	return vsel;
}

static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
					 unsigned selector)
{
	struct tps62360_chip *tps = rdev_get_drvdata(dev);
	int ret;
	bool found = false;
	int new_vset_id = tps->curr_vset_id;

	/*
	 * If gpios are available to select the VSET register then least
	 * recently used register for new configuration.
	 */
	if (tps->valid_gpios)
		found = find_voltage_set_register(tps, selector, &new_vset_id);

	if (!found) {
		ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
				tps->voltage_reg_mask, selector);
		if (ret < 0) {
			dev_err(tps->dev,
				"%s(): register %d update failed with err %d\n",
				 __func__, REG_VSET0 + new_vset_id, ret);
			return ret;
		}
		tps->curr_vset_id = new_vset_id;
		tps->curr_vset_vsel[new_vset_id] = selector;
	}

	/* Select proper VSET register vio gpios */
	if (tps->valid_gpios) {
		gpiod_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1);
		gpiod_set_value_cansleep(tps->vsel1_gpio,
					(new_vset_id >> 1) & 0x1);
	}
	return 0;
}

static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	int i;
	int val;
	int ret;

	/* Enable force PWM mode in FAST mode only. */
	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = FORCE_PWM_ENABLE;
		break;

	case REGULATOR_MODE_NORMAL:
		val = 0;
		break;

	default:
		return -EINVAL;
	}

	if (!tps->valid_gpios) {
		ret = regmap_update_bits(tps->regmap,
			REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
		if (ret < 0)
			dev_err(tps->dev,
				"%s(): register %d update failed with err %d\n",
				__func__, REG_VSET0 + tps->curr_vset_id, ret);
		return ret;
	}

	/* If gpios are valid then all register set need to be control */
	for (i = 0; i < 4; ++i) {
		ret = regmap_update_bits(tps->regmap,
					REG_VSET0 + i, FORCE_PWM_ENABLE, val);
		if (ret < 0) {
			dev_err(tps->dev,
				"%s(): register %d update failed with err %d\n",
				__func__, REG_VSET0 + i, ret);
			return ret;
		}
	}
	return ret;
}

static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
{
	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	unsigned int data;
	int ret;

	ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
	if (ret < 0) {
		dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
			__func__, REG_VSET0 + tps->curr_vset_id, ret);
		return ret;
	}
	return (data & FORCE_PWM_ENABLE) ?
				REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
}

static const struct regulator_ops tps62360_dcdc_ops = {
	.get_voltage_sel	= tps62360_dcdc_get_voltage_sel,
	.set_voltage_sel	= tps62360_dcdc_set_voltage_sel,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
	.set_mode		= tps62360_set_mode,
	.get_mode		= tps62360_get_mode,
};

static int tps62360_init_dcdc(struct tps62360_chip *tps,
		struct tps62360_regulator_platform_data *pdata)
{
	int ret;
	unsigned int ramp_ctrl;

	/* Initialize internal pull up/down control */
	if (tps->en_internal_pulldn)
		ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
	else
		ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);
	if (ret < 0) {
		dev_err(tps->dev,
			"%s(): register %d write failed with err %d\n",
			__func__, REG_CONTROL, ret);
		return ret;
	}

	/* Reset output discharge path to reduce power consumption */
	ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
	if (ret < 0) {
		dev_err(tps->dev,
			"%s(): register %d update failed with err %d\n",
			__func__, REG_RAMPCTRL, ret);
		return ret;
	}

	/* Get ramp value from ramp control register */
	ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
	if (ret < 0) {
		dev_err(tps->dev,
			"%s(): register %d read failed with err %d\n",
			__func__, REG_RAMPCTRL, ret);
		return ret;
	}
	ramp_ctrl = (ramp_ctrl >> 5) & 0x7;

	/* ramp mV/us = 32/(2^ramp_ctrl) */
	tps->desc.ramp_delay = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
	return ret;
}

static const struct regmap_config tps62360_regmap_config = {
	.reg_bits		= 8,
	.val_bits		= 8,
	.max_register		= REG_CHIPID,
	.cache_type		= REGCACHE_RBTREE,
};

static struct tps62360_regulator_platform_data *
	of_get_tps62360_platform_data(struct device *dev,
				      const struct regulator_desc *desc)
{
	struct tps62360_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->vsel0_def_state = of_property_read_bool(np, "ti,vsel0-state-high");
	pdata->vsel1_def_state = of_property_read_bool(np, "ti,vsel1-state-high");
	pdata->en_internal_pulldn = of_property_read_bool(np, "ti,enable-pull-down");
	pdata->en_discharge = of_property_read_bool(np, "ti,enable-vout-discharge");

	return pdata;
}

#if defined(CONFIG_OF)
static const struct of_device_id tps62360_of_match[] = {
	 { .compatible = "ti,tps62360", .data = (void *)TPS62360},
	 { .compatible = "ti,tps62361", .data = (void *)TPS62361},
	 { .compatible = "ti,tps62362", .data = (void *)TPS62362},
	 { .compatible = "ti,tps62363", .data = (void *)TPS62363},
	{},
};
MODULE_DEVICE_TABLE(of, tps62360_of_match);
#endif

static int tps62360_probe(struct i2c_client *client)
{
	const struct i2c_device_id *id = i2c_client_get_device_id(client);
	struct regulator_config config = { };
	struct tps62360_regulator_platform_data *pdata;
	struct regulator_dev *rdev;
	struct tps62360_chip *tps;
	int ret;
	int i;
	int chip_id;
	int gpio_flags;

	pdata = dev_get_platdata(&client->dev);

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

	tps->desc.name = client->name;
	tps->desc.id = 0;
	tps->desc.ops = &tps62360_dcdc_ops;
	tps->desc.type = REGULATOR_VOLTAGE;
	tps->desc.owner = THIS_MODULE;
	tps->desc.uV_step = 10000;

	if (client->dev.of_node) {
		const struct of_device_id *match;
		match = of_match_device(of_match_ptr(tps62360_of_match),
				&client->dev);
		if (!match) {
			dev_err(&client->dev, "Error: No device match found\n");
			return -ENODEV;
		}
		chip_id = (int)(long)match->data;
		if (!pdata)
			pdata = of_get_tps62360_platform_data(&client->dev,
							      &tps->desc);
	} else if (id) {
		chip_id = id->driver_data;
	} else {
		dev_err(&client->dev, "No device tree match or id table match found\n");
		return -ENODEV;
	}

	if (!pdata) {
		dev_err(&client->dev, "%s(): Platform data not found\n",
						__func__);
		return -EIO;
	}

	tps->en_discharge = pdata->en_discharge;
	tps->en_internal_pulldn = pdata->en_internal_pulldn;
	tps->dev = &client->dev;

	switch (chip_id) {
	case TPS62360:
	case TPS62362:
		tps->desc.min_uV = TPS62360_BASE_VOLTAGE;
		tps->voltage_reg_mask = 0x3F;
		tps->desc.n_voltages = TPS62360_N_VOLTAGES;
		break;
	case TPS62361:
	case TPS62363:
		tps->desc.min_uV = TPS62361_BASE_VOLTAGE;
		tps->voltage_reg_mask = 0x7F;
		tps->desc.n_voltages = TPS62361_N_VOLTAGES;
		break;
	default:
		return -ENODEV;
	}

	tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
	if (IS_ERR(tps->regmap)) {
		ret = PTR_ERR(tps->regmap);
		dev_err(&client->dev,
			"%s(): regmap allocation failed with err %d\n",
			__func__, ret);
		return ret;
	}
	i2c_set_clientdata(client, tps);

	tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
				(pdata->vsel0_def_state & 1);
	tps->lru_index[0] = tps->curr_vset_id;
	tps->valid_gpios = false;

	gpio_flags = (pdata->vsel0_def_state) ?
			GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	tps->vsel0_gpio = devm_gpiod_get_optional(&client->dev, "vsel0", gpio_flags);
	if (IS_ERR(tps->vsel0_gpio)) {
		dev_err(&client->dev,
			"%s(): Could not obtain vsel0 GPIO: %ld\n",
			__func__, PTR_ERR(tps->vsel0_gpio));
		return PTR_ERR(tps->vsel0_gpio);
	}

	gpio_flags = (pdata->vsel1_def_state) ?
			GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	tps->vsel1_gpio = devm_gpiod_get_optional(&client->dev, "vsel1", gpio_flags);
	if (IS_ERR(tps->vsel1_gpio)) {
		dev_err(&client->dev,
			"%s(): Could not obtain vsel1 GPIO: %ld\n",
			__func__, PTR_ERR(tps->vsel1_gpio));
		return PTR_ERR(tps->vsel1_gpio);
	}

	if (tps->vsel0_gpio != NULL && tps->vsel1_gpio != NULL) {
		tps->valid_gpios = true;

		/*
		 * Initialize the lru index with vset_reg id
		 * The index 0 will be most recently used and
		 * set with the tps->curr_vset_id */
		for (i = 0; i < 4; ++i)
			tps->lru_index[i] = i;
		tps->lru_index[0] = tps->curr_vset_id;
		tps->lru_index[tps->curr_vset_id] = 0;
	}

	ret = tps62360_init_dcdc(tps, pdata);
	if (ret < 0) {
		dev_err(tps->dev, "%s(): Init failed with err = %d\n",
				__func__, ret);
		return ret;
	}

	config.dev = &client->dev;
	config.init_data = pdata->reg_init_data;
	config.driver_data = tps;
	config.of_node = client->dev.of_node;

	/* Register the regulators */
	rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
	if (IS_ERR(rdev)) {
		dev_err(tps->dev,
			"%s(): regulator register failed with err %s\n",
			__func__, id->name);
		return PTR_ERR(rdev);
	}

	tps->rdev = rdev;
	return 0;
}

static void tps62360_shutdown(struct i2c_client *client)
{
	struct tps62360_chip *tps = i2c_get_clientdata(client);
	int st;

	if (!tps->en_discharge)
		return;

	/* Configure the output discharge path */
	st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
	if (st < 0)
		dev_err(tps->dev,
			"%s(): register %d update failed with err %d\n",
			__func__, REG_RAMPCTRL, st);
}

static const struct i2c_device_id tps62360_id[] = {
	{.name = "tps62360", .driver_data = TPS62360},
	{.name = "tps62361", .driver_data = TPS62361},
	{.name = "tps62362", .driver_data = TPS62362},
	{.name = "tps62363", .driver_data = TPS62363},
	{},
};

MODULE_DEVICE_TABLE(i2c, tps62360_id);

static struct i2c_driver tps62360_i2c_driver = {
	.driver = {
		.name = "tps62360",
		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
		.of_match_table = of_match_ptr(tps62360_of_match),
	},
	.probe_new = tps62360_probe,
	.shutdown = tps62360_shutdown,
	.id_table = tps62360_id,
};

static int __init tps62360_init(void)
{
	return i2c_add_driver(&tps62360_i2c_driver);
}
subsys_initcall(tps62360_init);

static void __exit tps62360_cleanup(void)
{
	i2c_del_driver(&tps62360_i2c_driver);
}
module_exit(tps62360_cleanup);

MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_DESCRIPTION("TPS6236x voltage regulator driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
e634cf4e	1	// SPDX-License-Identifier: GPL-2.0-only
6219929f LD	2	/*
	3	* tps62360.c -- TI tps62360
	4	*
d1cf4f65	5	* Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
6219929f LD	6	*
	7	* Copyright (c) 2012, NVIDIA Corporation.
	8	*
	9	* Author: Laxman Dewangan <ldewangan@nvidia.com>
6219929f LD	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/err.h>
684ae39b LD	16	#include <linux/of.h>
684ae39b LD	17	#include <linux/of_device.h>
684ae39b	18	#include <linux/regulator/of_regulator.h>
6219929f LD	19	#include <linux/platform_device.h>
	20	#include <linux/regulator/driver.h>
	21	#include <linux/regulator/machine.h>
	22	#include <linux/regulator/tps62360.h>
6a8b5bb0	23	#include <linux/gpio/consumer.h>
6219929f	24	#include <linux/i2c.h>
6219929f LD	25	#include <linux/slab.h>
	26	#include <linux/regmap.h>
	27
	28	/* Register definitions */
	29	#define REG_VSET0 0
	30	#define REG_VSET1 1
	31	#define REG_VSET2 2
	32	#define REG_VSET3 3
	33	#define REG_CONTROL 4
	34	#define REG_TEMP 5
	35	#define REG_RAMPCTRL 6
	36	#define REG_CHIPID 8
	37
9a00630c LD	38	#define FORCE_PWM_ENABLE BIT(7)
9a00630c LD	39
d1cf4f65	40	enum chips {TPS62360, TPS62361, TPS62362, TPS62363};
6219929f	41
2935fb18	42	#define TPS62360_BASE_VOLTAGE 770000
6219929f LD	43	#define TPS62360_N_VOLTAGES 64
6219929f LD	44
2935fb18	45	#define TPS62361_BASE_VOLTAGE 500000
6219929f LD	46	#define TPS62361_N_VOLTAGES 128
	47
	48	/* tps 62360 chip information */
	49	struct tps62360_chip {
6219929f LD	50	struct device *dev;
6219929f LD	51	struct regulator_desc desc;
6219929f LD	52	struct regulator_dev *rdev;
6219929f LD	53	struct regmap *regmap;
6a8b5bb0 MC	54	struct gpio_desc *vsel0_gpio;
6a8b5bb0 MC	55	struct gpio_desc *vsel1_gpio;
6219929f LD	56	u8 voltage_reg_mask;
6219929f LD	57	bool en_internal_pulldn;
6219929f LD	58	bool en_discharge;
	59	bool valid_gpios;
	60	int lru_index[4];
	61	int curr_vset_vsel[4];
	62	int curr_vset_id;
	63	};
	64
	65	/*
	66	* find_voltage_set_register: Find new voltage configuration register
	67	* (VSET) id.
	68	* The finding of the new VSET register will be based on the LRU mechanism.
	69	* Each VSET register will have different voltage configured . This
	70	* Function will look if any of the VSET register have requested voltage set
	71	* or not.
	72	* - If it is already there then it will make that register as most
	73	* recently used and return as found so that caller need not to set
	74	* the VSET register but need to set the proper gpios to select this
	75	* VSET register.
	76	* - If requested voltage is not found then it will use the least
	77	* recently mechanism to get new VSET register for new configuration
	78	* and will return not_found so that caller need to set new VSET
	79	* register and then gpios (both).
	80	*/
	81	static bool find_voltage_set_register(struct tps62360_chip *tps,
	82	int req_vsel, int *vset_reg_id)
	83	{
	84	int i;
	85	bool found = false;
	86	int new_vset_reg = tps->lru_index[3];
	87	int found_index = 3;
2935fb18	88
6219929f LD	89	for (i = 0; i < 4; ++i) {
	90	if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {
	91	new_vset_reg = tps->lru_index[i];
	92	found_index = i;
	93	found = true;
	94	goto update_lru_index;
	95	}
	96	}
	97
	98	update_lru_index:
	99	for (i = found_index; i > 0; i--)
	100	tps->lru_index[i] = tps->lru_index[i - 1];
	101
	102	tps->lru_index[0] = new_vset_reg;
	103	*vset_reg_id = new_vset_reg;
	104	return found;
	105	}
	106
a60cfce0	107	static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev)
6219929f LD	108	{
	109	struct tps62360_chip *tps = rdev_get_drvdata(dev);
	110	int vsel;
	111	unsigned int data;
	112	int ret;
	113
	114	ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
	115	if (ret < 0) {
2935fb18 LD	116	dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
2935fb18 LD	117	__func__, REG_VSET0 + tps->curr_vset_id, ret);
6219929f LD	118	return ret;
	119	}
	120	vsel = (int)data & tps->voltage_reg_mask;
a60cfce0	121	return vsel;
6219929f LD	122	}
6219929f LD	123
41097afd AL	124	static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
41097afd AL	125	unsigned selector)
6219929f LD	126	{
6219929f LD	127	struct tps62360_chip *tps = rdev_get_drvdata(dev);
6219929f LD	128	int ret;
	129	bool found = false;
	130	int new_vset_id = tps->curr_vset_id;
	131
6219929f LD	132	/*
	133	* If gpios are available to select the VSET register then least
	134	* recently used register for new configuration.
	135	*/
	136	if (tps->valid_gpios)
41097afd	137	found = find_voltage_set_register(tps, selector, &new_vset_id);
6219929f LD	138
	139	if (!found) {
	140	ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
41097afd	141	tps->voltage_reg_mask, selector);
6219929f	142	if (ret < 0) {
2935fb18 LD	143	dev_err(tps->dev,
	144	"%s(): register %d update failed with err %d\n",
	145	__func__, REG_VSET0 + new_vset_id, ret);
6219929f LD	146	return ret;
	147	}
	148	tps->curr_vset_id = new_vset_id;
41097afd	149	tps->curr_vset_vsel[new_vset_id] = selector;
6219929f LD	150	}
	151
	152	/* Select proper VSET register vio gpios */
	153	if (tps->valid_gpios) {
6a8b5bb0 MC	154	gpiod_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1);
6a8b5bb0 MC	155	gpiod_set_value_cansleep(tps->vsel1_gpio,
6219929f LD	156	(new_vset_id >> 1) & 0x1);
	157	}
	158	return 0;
	159	}
	160
9a00630c LD	161	static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode)
	162	{
	163	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	164	int i;
	165	int val;
	166	int ret;
	167
	168	/* Enable force PWM mode in FAST mode only. */
	169	switch (mode) {
	170	case REGULATOR_MODE_FAST:
	171	val = FORCE_PWM_ENABLE;
	172	break;
	173
	174	case REGULATOR_MODE_NORMAL:
	175	val = 0;
	176	break;
	177
	178	default:
	179	return -EINVAL;
	180	}
	181
	182	if (!tps->valid_gpios) {
	183	ret = regmap_update_bits(tps->regmap,
	184	REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
	185	if (ret < 0)
	186	dev_err(tps->dev,
	187	"%s(): register %d update failed with err %d\n",
	188	__func__, REG_VSET0 + tps->curr_vset_id, ret);
	189	return ret;
	190	}
	191
	192	/* If gpios are valid then all register set need to be control */
	193	for (i = 0; i < 4; ++i) {
	194	ret = regmap_update_bits(tps->regmap,
	195	REG_VSET0 + i, FORCE_PWM_ENABLE, val);
	196	if (ret < 0) {
	197	dev_err(tps->dev,
	198	"%s(): register %d update failed with err %d\n",
	199	__func__, REG_VSET0 + i, ret);
	200	return ret;
	201	}
	202	}
	203	return ret;
	204	}
	205
	206	static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
	207	{
	208	struct tps62360_chip *tps = rdev_get_drvdata(rdev);
	209	unsigned int data;
	210	int ret;
	211
	212	ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
	213	if (ret < 0) {
	214	dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
	215	__func__, REG_VSET0 + tps->curr_vset_id, ret);
	216	return ret;
	217	}
	218	return (data & FORCE_PWM_ENABLE) ?
	219	REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
	220	}
	221
01167e88	222	static const struct regulator_ops tps62360_dcdc_ops = {
a60cfce0	223	.get_voltage_sel = tps62360_dcdc_get_voltage_sel,
41097afd	224	.set_voltage_sel = tps62360_dcdc_set_voltage_sel,
7f225ba5	225	.list_voltage = regulator_list_voltage_linear,
41097afd	226	.map_voltage = regulator_map_voltage_linear,
0072f0a8	227	.set_voltage_time_sel = regulator_set_voltage_time_sel,
9a00630c LD	228	.set_mode = tps62360_set_mode,
9a00630c LD	229	.get_mode = tps62360_get_mode,
6219929f LD	230	};
6219929f LD	231
a5023574	232	static int tps62360_init_dcdc(struct tps62360_chip *tps,
6219929f LD	233	struct tps62360_regulator_platform_data *pdata)
	234	{
	235	int ret;
a60cfce0	236	unsigned int ramp_ctrl;
6219929f	237
2935fb18	238	/* Initialize internal pull up/down control */
6219929f LD	239	if (tps->en_internal_pulldn)
	240	ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
	241	else
	242	ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);
	243	if (ret < 0) {
2935fb18 LD	244	dev_err(tps->dev,
	245	"%s(): register %d write failed with err %d\n",
	246	__func__, REG_CONTROL, ret);
6219929f LD	247	return ret;
	248	}
	249
6219929f LD	250	/* Reset output discharge path to reduce power consumption */
6219929f LD	251	ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
a60cfce0	252	if (ret < 0) {
2935fb18 LD	253	dev_err(tps->dev,
	254	"%s(): register %d update failed with err %d\n",
	255	__func__, REG_RAMPCTRL, ret);
a60cfce0 LD	256	return ret;
	257	}
	258
	259	/* Get ramp value from ramp control register */
	260	ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
	261	if (ret < 0) {
2935fb18 LD	262	dev_err(tps->dev,
	263	"%s(): register %d read failed with err %d\n",
	264	__func__, REG_RAMPCTRL, ret);
a60cfce0 LD	265	return ret;
a60cfce0 LD	266	}
1864b670	267	ramp_ctrl = (ramp_ctrl >> 5) & 0x7;
a60cfce0 LD	268
a60cfce0 LD	269	/* ramp mV/us = 32/(2^ramp_ctrl) */
0072f0a8	270	tps->desc.ramp_delay = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
6219929f LD	271	return ret;
	272	}
	273
	274	static const struct regmap_config tps62360_regmap_config = {
16ea003b LD	275	.reg_bits = 8,
	276	.val_bits = 8,
	277	.max_register = REG_CHIPID,
	278	.cache_type = REGCACHE_RBTREE,
6219929f LD	279	};
6219929f LD	280
684ae39b	281	static struct tps62360_regulator_platform_data *
072e78b1 JMC	282	of_get_tps62360_platform_data(struct device *dev,
072e78b1 JMC	283	const struct regulator_desc *desc)
684ae39b LD	284	{
	285	struct tps62360_regulator_platform_data *pdata;
	286	struct device_node *np = dev->of_node;
	287
	288	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
33e63ba6	289	if (!pdata)
684ae39b	290	return NULL;
684ae39b	291
072e78b1 JMC	292	pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node,
072e78b1 JMC	293	desc);
684ae39b LD	294	if (!pdata->reg_init_data) {
	295	dev_err(dev, "Not able to get OF regulator init data\n");
	296	return NULL;
	297	}
	298
5bd73a16 RH	299	pdata->vsel0_def_state = of_property_read_bool(np, "ti,vsel0-state-high");
	300	pdata->vsel1_def_state = of_property_read_bool(np, "ti,vsel1-state-high");
	301	pdata->en_internal_pulldn = of_property_read_bool(np, "ti,enable-pull-down");
	302	pdata->en_discharge = of_property_read_bool(np, "ti,enable-vout-discharge");
684ae39b LD	303
	304	return pdata;
	305	}
	306
	307	#if defined(CONFIG_OF)
	308	static const struct of_device_id tps62360_of_match[] = {
	309	{ .compatible = "ti,tps62360", .data = (void *)TPS62360},
	310	{ .compatible = "ti,tps62361", .data = (void *)TPS62361},
	311	{ .compatible = "ti,tps62362", .data = (void *)TPS62362},
	312	{ .compatible = "ti,tps62363", .data = (void *)TPS62363},
	313	{},
be15411d	314	};
684ae39b LD	315	MODULE_DEVICE_TABLE(of, tps62360_of_match);
	316	#endif
	317
18804160	318	static int tps62360_probe(struct i2c_client *client)
6219929f	319	{
18804160	320	const struct i2c_device_id *id = i2c_client_get_device_id(client);
c172708d	321	struct regulator_config config = { };
6219929f LD	322	struct tps62360_regulator_platform_data *pdata;
	323	struct regulator_dev *rdev;
	324	struct tps62360_chip *tps;
	325	int ret;
	326	int i;
684ae39b	327	int chip_id;
6a8b5bb0	328	int gpio_flags;
6219929f	329
dff91d0b	330	pdata = dev_get_platdata(&client->dev);
684ae39b	331
072e78b1 JMC	332	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
	333	if (!tps)
	334	return -ENOMEM;
	335
	336	tps->desc.name = client->name;
	337	tps->desc.id = 0;
	338	tps->desc.ops = &tps62360_dcdc_ops;
	339	tps->desc.type = REGULATOR_VOLTAGE;
	340	tps->desc.owner = THIS_MODULE;
	341	tps->desc.uV_step = 10000;
	342
684ae39b LD	343	if (client->dev.of_node) {
	344	const struct of_device_id *match;
	345	match = of_match_device(of_match_ptr(tps62360_of_match),
	346	&client->dev);
	347	if (!match) {
	348	dev_err(&client->dev, "Error: No device match found\n");
	349	return -ENODEV;
	350	}
541f597f	351	chip_id = (int)(long)match->data;
684ae39b	352	if (!pdata)
072e78b1 JMC	353	pdata = of_get_tps62360_platform_data(&client->dev,
072e78b1 JMC	354	&tps->desc);
0a62d03b TT	355	} else if (id) {
	356	chip_id = id->driver_data;
	357	} else {
	358	dev_err(&client->dev, "No device tree match or id table match found\n");
	359	return -ENODEV;
684ae39b LD	360	}
684ae39b LD	361
6219929f	362	if (!pdata) {
2935fb18	363	dev_err(&client->dev, "%s(): Platform data not found\n",
6219929f LD	364	__func__);
	365	return -EIO;
	366	}
	367
6219929f LD	368	tps->en_discharge = pdata->en_discharge;
6219929f LD	369	tps->en_internal_pulldn = pdata->en_internal_pulldn;
6219929f	370	tps->dev = &client->dev;
d1cf4f65	371
684ae39b	372	switch (chip_id) {
d1cf4f65 AL	373	case TPS62360:
d1cf4f65 AL	374	case TPS62362:
b5152415	375	tps->desc.min_uV = TPS62360_BASE_VOLTAGE;
d1cf4f65 AL	376	tps->voltage_reg_mask = 0x3F;
	377	tps->desc.n_voltages = TPS62360_N_VOLTAGES;
	378	break;
	379	case TPS62361:
	380	case TPS62363:
b5152415	381	tps->desc.min_uV = TPS62361_BASE_VOLTAGE;
d1cf4f65 AL	382	tps->voltage_reg_mask = 0x7F;
	383	tps->desc.n_voltages = TPS62361_N_VOLTAGES;
	384	break;
	385	default:
	386	return -ENODEV;
	387	}
6219929f	388
9a4bdd87	389	tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
6219929f LD	390	if (IS_ERR(tps->regmap)) {
6219929f LD	391	ret = PTR_ERR(tps->regmap);
2935fb18 LD	392	dev_err(&client->dev,
	393	"%s(): regmap allocation failed with err %d\n",
	394	__func__, ret);
6219929f LD	395	return ret;
	396	}
	397	i2c_set_clientdata(client, tps);
	398
	399	tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
	400	(pdata->vsel0_def_state & 1);
	401	tps->lru_index[0] = tps->curr_vset_id;
	402	tps->valid_gpios = false;
	403
6a8b5bb0 MC	404	gpio_flags = (pdata->vsel0_def_state) ?
	405	GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	406	tps->vsel0_gpio = devm_gpiod_get_optional(&client->dev, "vsel0", gpio_flags);
	407	if (IS_ERR(tps->vsel0_gpio)) {
	408	dev_err(&client->dev,
	409	"%s(): Could not obtain vsel0 GPIO: %ld\n",
	410	__func__, PTR_ERR(tps->vsel0_gpio));
	411	return PTR_ERR(tps->vsel0_gpio);
	412	}
6219929f	413
6a8b5bb0 MC	414	gpio_flags = (pdata->vsel1_def_state) ?
	415	GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	416	tps->vsel1_gpio = devm_gpiod_get_optional(&client->dev, "vsel1", gpio_flags);
	417	if (IS_ERR(tps->vsel1_gpio)) {
	418	dev_err(&client->dev,
	419	"%s(): Could not obtain vsel1 GPIO: %ld\n",
	420	__func__, PTR_ERR(tps->vsel1_gpio));
	421	return PTR_ERR(tps->vsel1_gpio);
	422	}
	423
	424	if (tps->vsel0_gpio != NULL && tps->vsel1_gpio != NULL) {
6219929f LD	425	tps->valid_gpios = true;
	426
	427	/*
	428	* Initialize the lru index with vset_reg id
	429	* The index 0 will be most recently used and
	430	* set with the tps->curr_vset_id */
	431	for (i = 0; i < 4; ++i)
	432	tps->lru_index[i] = i;
	433	tps->lru_index[0] = tps->curr_vset_id;
	434	tps->lru_index[tps->curr_vset_id] = 0;
	435	}
	436
	437	ret = tps62360_init_dcdc(tps, pdata);
	438	if (ret < 0) {
2935fb18	439	dev_err(tps->dev, "%s(): Init failed with err = %d\n",
6219929f	440	__func__, ret);
8a8e3d59	441	return ret;
6219929f LD	442	}
6219929f LD	443
c172708d	444	config.dev = &client->dev;
8bdca009	445	config.init_data = pdata->reg_init_data;
c172708d	446	config.driver_data = tps;
9fc3815e	447	config.of_node = client->dev.of_node;
c172708d	448
6219929f	449	/* Register the regulators */
58c6e938	450	rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
6219929f	451	if (IS_ERR(rdev)) {
2935fb18 LD	452	dev_err(tps->dev,
	453	"%s(): regulator register failed with err %s\n",
	454	__func__, id->name);
8a8e3d59	455	return PTR_ERR(rdev);
6219929f LD	456	}
	457
	458	tps->rdev = rdev;
	459	return 0;
6219929f LD	460	}
6219929f LD	461
6219929f LD	462	static void tps62360_shutdown(struct i2c_client *client)
	463	{
	464	struct tps62360_chip *tps = i2c_get_clientdata(client);
	465	int st;
	466
	467	if (!tps->en_discharge)
	468	return;
	469
	470	/* Configure the output discharge path */
	471	st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
	472	if (st < 0)
2935fb18 LD	473	dev_err(tps->dev,
	474	"%s(): register %d update failed with err %d\n",
	475	__func__, REG_RAMPCTRL, st);
6219929f LD	476	}
	477
	478	static const struct i2c_device_id tps62360_id[] = {
	479	{.name = "tps62360", .driver_data = TPS62360},
	480	{.name = "tps62361", .driver_data = TPS62361},
d1cf4f65 AL	481	{.name = "tps62362", .driver_data = TPS62362},
d1cf4f65 AL	482	{.name = "tps62363", .driver_data = TPS62363},
6219929f LD	483	{},
	484	};
	485
	486	MODULE_DEVICE_TABLE(i2c, tps62360_id);
	487
	488	static struct i2c_driver tps62360_i2c_driver = {
	489	.driver = {
	490	.name = "tps62360",
259b93b2	491	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
684ae39b	492	.of_match_table = of_match_ptr(tps62360_of_match),
6219929f	493	},
18804160	494	.probe_new = tps62360_probe,
6219929f LD	495	.shutdown = tps62360_shutdown,
	496	.id_table = tps62360_id,
	497	};
	498
	499	static int __init tps62360_init(void)
	500	{
	501	return i2c_add_driver(&tps62360_i2c_driver);
	502	}
	503	subsys_initcall(tps62360_init);
	504
	505	static void __exit tps62360_cleanup(void)
	506	{
	507	i2c_del_driver(&tps62360_i2c_driver);
	508	}
	509	module_exit(tps62360_cleanup);
	510
	511	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
d1cf4f65	512	MODULE_DESCRIPTION("TPS6236x voltage regulator driver");
6219929f	513	MODULE_LICENSE("GPL v2");