[thirdparty/linux.git] / drivers / regulator / mpq7920.c

// SPDX-License-Identifier: GPL-2.0+
//
// mpq7920.c  - regulator driver for mps mpq7920
//
// Copyright 2019 Monolithic Power Systems, Inc
//
// Author: Saravanan Sekar <sravanhome@gmail.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/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include "mpq7920.h"

#define MPQ7920_BUCK_VOLT_RANGE \
	((MPQ7920_VOLT_MAX - MPQ7920_BUCK_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)
#define MPQ7920_LDO_VOLT_RANGE \
	((MPQ7920_VOLT_MAX - MPQ7920_LDO_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)

#define MPQ7920BUCK(_name, _id, _ilim)					\
	[MPQ7920_BUCK ## _id] = {					\
		.id = MPQ7920_BUCK ## _id,				\
		.name = _name,						\
		.of_match = _name,					\
		.regulators_node = "regulators",			\
		.of_parse_cb = mpq7920_parse_cb,			\
		.ops = &mpq7920_buck_ops,				\
		.min_uV = MPQ7920_BUCK_VOLT_MIN,			\
		.uV_step = MPQ7920_VOLT_STEP,				\
		.n_voltages = MPQ7920_BUCK_VOLT_RANGE,			\
		.curr_table = _ilim,					\
		.n_current_limits = ARRAY_SIZE(_ilim),			\
		.csel_reg = MPQ7920_BUCK ##_id## _REG_C,		\
		.csel_mask = MPQ7920_MASK_BUCK_ILIM,			\
		.enable_reg = MPQ7920_REG_REGULATOR_EN,			\
		.enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET -	\
					 MPQ7920_BUCK ## _id),		\
		.vsel_reg = MPQ7920_BUCK ##_id## _REG_A,		\
		.vsel_mask = MPQ7920_MASK_VREF,				\
		.active_discharge_on	= MPQ7920_DISCHARGE_ON,		\
		.active_discharge_reg	= MPQ7920_BUCK ##_id## _REG_B,	\
		.active_discharge_mask	= MPQ7920_MASK_DISCHARGE,	\
		.soft_start_reg		= MPQ7920_BUCK ##_id## _REG_C,	\
		.soft_start_mask	= MPQ7920_MASK_SOFTSTART,	\
		.owner			= THIS_MODULE,			\
	}

#define MPQ7920LDO(_name, _id, _ops, _ilim, _ilim_sz, _creg, _cmask)	\
	[MPQ7920_LDO ## _id] = {					\
		.id = MPQ7920_LDO ## _id,				\
		.name = _name,						\
		.of_match = _name,					\
		.regulators_node = "regulators",			\
		.ops = _ops,						\
		.min_uV = MPQ7920_LDO_VOLT_MIN,				\
		.uV_step = MPQ7920_VOLT_STEP,				\
		.n_voltages = MPQ7920_LDO_VOLT_RANGE,			\
		.vsel_reg = MPQ7920_LDO ##_id## _REG_A,			\
		.vsel_mask = MPQ7920_MASK_VREF,				\
		.curr_table = _ilim,					\
		.n_current_limits = _ilim_sz,				\
		.csel_reg = _creg,					\
		.csel_mask = _cmask,					\
		.enable_reg = (_id == 1) ? 0 : MPQ7920_REG_REGULATOR_EN,\
		.enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET -	\
					MPQ7920_LDO ##_id + 1),		\
		.active_discharge_on	= MPQ7920_DISCHARGE_ON,		\
		.active_discharge_mask	= MPQ7920_MASK_DISCHARGE,	\
		.active_discharge_reg	= MPQ7920_LDO ##_id## _REG_B,	\
		.type			= REGULATOR_VOLTAGE,		\
		.owner			= THIS_MODULE,			\
	}

enum mpq7920_regulators {
	MPQ7920_BUCK1,
	MPQ7920_BUCK2,
	MPQ7920_BUCK3,
	MPQ7920_BUCK4,
	MPQ7920_LDO1, /* LDORTC */
	MPQ7920_LDO2,
	MPQ7920_LDO3,
	MPQ7920_LDO4,
	MPQ7920_LDO5,
	MPQ7920_MAX_REGULATORS,
};

struct mpq7920_regulator_info {
	struct regmap *regmap;
	struct regulator_desc *rdesc;
};

static const struct regmap_config mpq7920_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0x25,
};

/* Current limits array (in uA)
 * ILIM1 & ILIM3
 */
static const unsigned int mpq7920_I_limits1[] = {
	4600000, 6600000, 7600000, 9300000
};

/* ILIM2 & ILIM4 */
static const unsigned int mpq7920_I_limits2[] = {
	2700000, 3900000, 5100000, 6100000
};

/* LDO4 & LDO5 */
static const unsigned int mpq7920_I_limits3[] = {
	300000, 700000
};

static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay);
static int mpq7920_parse_cb(struct device_node *np,
				const struct regulator_desc *rdesc,
				struct regulator_config *config);

/* RTCLDO not controllable, always ON */
static const struct regulator_ops mpq7920_ldortc_ops = {
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
};

static const struct regulator_ops mpq7920_ldo_wo_current_ops = {
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.is_enabled		= regulator_is_enabled_regmap,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.set_active_discharge	= regulator_set_active_discharge_regmap,
};

static const struct regulator_ops mpq7920_ldo_ops = {
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.is_enabled		= regulator_is_enabled_regmap,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.set_active_discharge	= regulator_set_active_discharge_regmap,
	.get_current_limit	= regulator_get_current_limit_regmap,
	.set_current_limit	= regulator_set_current_limit_regmap,
};

static const struct regulator_ops mpq7920_buck_ops = {
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.is_enabled		= regulator_is_enabled_regmap,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.set_active_discharge	= regulator_set_active_discharge_regmap,
	.set_soft_start		= regulator_set_soft_start_regmap,
	.set_ramp_delay		= mpq7920_set_ramp_delay,
};

static struct regulator_desc mpq7920_regulators_desc[MPQ7920_MAX_REGULATORS] = {
	MPQ7920BUCK("buck1", 1, mpq7920_I_limits1),
	MPQ7920BUCK("buck2", 2, mpq7920_I_limits2),
	MPQ7920BUCK("buck3", 3, mpq7920_I_limits1),
	MPQ7920BUCK("buck4", 4, mpq7920_I_limits2),
	MPQ7920LDO("ldortc", 1, &mpq7920_ldortc_ops, NULL, 0, 0, 0),
	MPQ7920LDO("ldo2", 2, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),
	MPQ7920LDO("ldo3", 3, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),
	MPQ7920LDO("ldo4", 4, &mpq7920_ldo_ops, mpq7920_I_limits3,
			ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO4_REG_B,
			MPQ7920_MASK_LDO_ILIM),
	MPQ7920LDO("ldo5", 5, &mpq7920_ldo_ops, mpq7920_I_limits3,
			ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO5_REG_B,
			MPQ7920_MASK_LDO_ILIM),
};

/*
 * DVS ramp rate BUCK1 to BUCK4
 * 00-01: Reserved
 * 10: 8mV/us
 * 11: 4mV/us
 */
static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
	unsigned int ramp_val;

	if (ramp_delay > 8000 || ramp_delay < 0)
		return -EINVAL;

	if (ramp_delay <= 4000)
		ramp_val = 3;
	else
		ramp_val = 2;

	return regmap_update_bits(rdev->regmap, MPQ7920_REG_CTL0,
				  MPQ7920_MASK_DVS_SLEWRATE, ramp_val << 6);
}

static int mpq7920_parse_cb(struct device_node *np,
				const struct regulator_desc *desc,
				struct regulator_config *config)
{
	uint8_t val;
	int ret;
	struct mpq7920_regulator_info *info = config->driver_data;
	struct regulator_desc *rdesc = &info->rdesc[desc->id];

	if (of_property_read_bool(np, "mps,buck-ovp-disable")) {
		regmap_update_bits(config->regmap,
				MPQ7920_BUCK1_REG_B + (rdesc->id * 4),
				MPQ7920_MASK_OVP, MPQ7920_OVP_DISABLE);
	}

	ret = of_property_read_u8(np, "mps,buck-phase-delay", &val);
	if (!ret) {
		regmap_update_bits(config->regmap,
				MPQ7920_BUCK1_REG_C + (rdesc->id * 4),
				MPQ7920_MASK_BUCK_PHASE_DEALY,
				(val & 3) << 4);
	}

	ret = of_property_read_u8(np, "mps,buck-softstart", &val);
	if (!ret)
		rdesc->soft_start_val_on = (val & 3) << 2;

	return 0;
}

static void mpq7920_parse_dt(struct device *dev,
		 struct mpq7920_regulator_info *info)
{
	int ret;
	struct device_node *np = dev->of_node;
	uint8_t freq;

	np = of_get_child_by_name(np, "regulators");
	if (!np) {
		dev_err(dev, "missing 'regulators' subnode in DT\n");
		return;
	}

	ret = of_property_read_u8(np, "mps,switch-freq", &freq);
	if (!ret) {
		regmap_update_bits(info->regmap, MPQ7920_REG_CTL0,
					MPQ7920_MASK_SWITCH_FREQ,
					(freq & 3) << 4);
	}

	of_node_put(np);
}

static int mpq7920_i2c_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct mpq7920_regulator_info *info;
	struct regulator_config config = { NULL, };
	struct regulator_dev *rdev;
	struct regmap *regmap;
	int i;

	info = devm_kzalloc(dev, sizeof(struct mpq7920_regulator_info),
				GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->rdesc = mpq7920_regulators_desc;
	regmap = devm_regmap_init_i2c(client, &mpq7920_regmap_config);
	if (IS_ERR(regmap)) {
		dev_err(dev, "Failed to allocate regmap!\n");
		return PTR_ERR(regmap);
	}

	i2c_set_clientdata(client, info);
	info->regmap = regmap;
	if (client->dev.of_node)
		mpq7920_parse_dt(&client->dev, info);

	config.dev = dev;
	config.regmap = regmap;
	config.driver_data = info;

	for (i = 0; i < MPQ7920_MAX_REGULATORS; i++) {
		rdev = devm_regulator_register(dev,
					       &mpq7920_regulators_desc[i],
					       &config);
		if (IS_ERR(rdev)) {
			dev_err(dev, "Failed to register regulator!\n");
			return PTR_ERR(rdev);
		}
	}

	return 0;
}

static const struct of_device_id mpq7920_of_match[] = {
	{ .compatible = "mps,mpq7920"},
	{},
};
MODULE_DEVICE_TABLE(of, mpq7920_of_match);

static const struct i2c_device_id mpq7920_id[] = {
	{ "mpq7920", },
	{ },
};
MODULE_DEVICE_TABLE(i2c, mpq7920_id);

static struct i2c_driver mpq7920_regulator_driver = {
	.driver = {
		.name = "mpq7920",
		.of_match_table = of_match_ptr(mpq7920_of_match),
	},
	.probe_new = mpq7920_i2c_probe,
	.id_table = mpq7920_id,
};
module_i2c_driver(mpq7920_regulator_driver);

MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
MODULE_DESCRIPTION("MPQ7920 PMIC regulator driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
6501c1f5 SS	1	// SPDX-License-Identifier: GPL-2.0+
	2	//
	3	// mpq7920.c - regulator driver for mps mpq7920
	4	//
	5	// Copyright 2019 Monolithic Power Systems, Inc
	6	//
	7	// Author: Saravanan Sekar <sravanhome@gmail.com>
	8
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/err.h>
	13	#include <linux/of.h>
	14	#include <linux/of_device.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/regulator/driver.h>
	17	#include <linux/regulator/of_regulator.h>
	18	#include <linux/i2c.h>
	19	#include <linux/regmap.h>
	20	#include "mpq7920.h"
	21
	22	#define MPQ7920_BUCK_VOLT_RANGE \
	23	((MPQ7920_VOLT_MAX - MPQ7920_BUCK_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)
	24	#define MPQ7920_LDO_VOLT_RANGE \
	25	((MPQ7920_VOLT_MAX - MPQ7920_LDO_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)
	26
	27	#define MPQ7920BUCK(_name, _id, _ilim) \
	28	[MPQ7920_BUCK ## _id] = { \
	29	.id = MPQ7920_BUCK ## _id, \
	30	.name = _name, \
	31	.of_match = _name, \
	32	.regulators_node = "regulators", \
	33	.of_parse_cb = mpq7920_parse_cb, \
	34	.ops = &mpq7920_buck_ops, \
	35	.min_uV = MPQ7920_BUCK_VOLT_MIN, \
	36	.uV_step = MPQ7920_VOLT_STEP, \
	37	.n_voltages = MPQ7920_BUCK_VOLT_RANGE, \
	38	.curr_table = _ilim, \
	39	.n_current_limits = ARRAY_SIZE(_ilim), \
	40	.csel_reg = MPQ7920_BUCK ##_id## _REG_C, \
	41	.csel_mask = MPQ7920_MASK_BUCK_ILIM, \
	42	.enable_reg = MPQ7920_REG_REGULATOR_EN, \
	43	.enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \
	44	MPQ7920_BUCK ## _id), \
	45	.vsel_reg = MPQ7920_BUCK ##_id## _REG_A, \
	46	.vsel_mask = MPQ7920_MASK_VREF, \
	47	.active_discharge_on = MPQ7920_DISCHARGE_ON, \
	48	.active_discharge_reg = MPQ7920_BUCK ##_id## _REG_B, \
	49	.active_discharge_mask = MPQ7920_MASK_DISCHARGE, \
	50	.soft_start_reg = MPQ7920_BUCK ##_id## _REG_C, \
	51	.soft_start_mask = MPQ7920_MASK_SOFTSTART, \
	52	.owner = THIS_MODULE, \
	53	}
	54
	55	#define MPQ7920LDO(_name, _id, _ops, _ilim, _ilim_sz, _creg, _cmask) \
	56	[MPQ7920_LDO ## _id] = { \
	57	.id = MPQ7920_LDO ## _id, \
	58	.name = _name, \
	59	.of_match = _name, \
	60	.regulators_node = "regulators", \
	61	.ops = _ops, \
	62	.min_uV = MPQ7920_LDO_VOLT_MIN, \
	63	.uV_step = MPQ7920_VOLT_STEP, \
	64	.n_voltages = MPQ7920_LDO_VOLT_RANGE, \
65	.vsel_reg = MPQ7920_LDO ##_id## _REG_A, \
66	.vsel_mask = MPQ7920_MASK_VREF, \
67	.curr_table = _ilim, \
68	.n_current_limits = _ilim_sz, \
69	.csel_reg = _creg, \
70	.csel_mask = _cmask, \
71	.enable_reg = (_id == 1) ? 0 : MPQ7920_REG_REGULATOR_EN,\
72	.enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \
73	MPQ7920_LDO ##_id + 1), \
74	.active_discharge_on = MPQ7920_DISCHARGE_ON, \
75	.active_discharge_mask = MPQ7920_MASK_DISCHARGE, \
76	.active_discharge_reg = MPQ7920_LDO ##_id## _REG_B, \
77	.type = REGULATOR_VOLTAGE, \
78	.owner = THIS_MODULE, \
79	}
80
81	enum mpq7920_regulators {
82	MPQ7920_BUCK1,
83	MPQ7920_BUCK2,
84	MPQ7920_BUCK3,
85	MPQ7920_BUCK4,
86	MPQ7920_LDO1, /* LDORTC */
87	MPQ7920_LDO2,
88	MPQ7920_LDO3,
89	MPQ7920_LDO4,
90	MPQ7920_LDO5,
91	MPQ7920_MAX_REGULATORS,
92	};
93
94	struct mpq7920_regulator_info {
6501c1f5	95	struct regmap *regmap;
6501c1f5 SS	96	struct regulator_desc *rdesc;
	97	};
	98
	99	static const struct regmap_config mpq7920_regmap_config = {
	100	.reg_bits = 8,
	101	.val_bits = 8,
	102	.max_register = 0x25,
	103	};
	104
	105	/* Current limits array (in uA)
	106	* ILIM1 & ILIM3
	107	*/
	108	static const unsigned int mpq7920_I_limits1[] = {
	109	4600000, 6600000, 7600000, 9300000
	110	};
	111
	112	/* ILIM2 & ILIM4 */
	113	static const unsigned int mpq7920_I_limits2[] = {
	114	2700000, 3900000, 5100000, 6100000
	115	};
	116
	117	/* LDO4 & LDO5 */
	118	static const unsigned int mpq7920_I_limits3[] = {
	119	300000, 700000
	120	};
	121
	122	static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay);
	123	static int mpq7920_parse_cb(struct device_node *np,
	124	const struct regulator_desc *rdesc,
	125	struct regulator_config *config);
	126
	127	/* RTCLDO not controllable, always ON */
	128	static const struct regulator_ops mpq7920_ldortc_ops = {
	129	.list_voltage = regulator_list_voltage_linear,
	130	.map_voltage = regulator_map_voltage_linear,
	131	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	132	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	133	};
	134
	135	static const struct regulator_ops mpq7920_ldo_wo_current_ops = {
	136	.enable = regulator_enable_regmap,
	137	.disable = regulator_disable_regmap,
	138	.is_enabled = regulator_is_enabled_regmap,
	139	.list_voltage = regulator_list_voltage_linear,
	140	.map_voltage = regulator_map_voltage_linear,
	141	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	142	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	143	.set_active_discharge = regulator_set_active_discharge_regmap,
	144	};
	145
	146	static const struct regulator_ops mpq7920_ldo_ops = {
	147	.enable = regulator_enable_regmap,
	148	.disable = regulator_disable_regmap,
	149	.is_enabled = regulator_is_enabled_regmap,
	150	.list_voltage = regulator_list_voltage_linear,
	151	.map_voltage = regulator_map_voltage_linear,
	152	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	153	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	154	.set_active_discharge = regulator_set_active_discharge_regmap,
	155	.get_current_limit = regulator_get_current_limit_regmap,
	156	.set_current_limit = regulator_set_current_limit_regmap,
	157	};
	158
	159	static const struct regulator_ops mpq7920_buck_ops = {
160	.enable = regulator_enable_regmap,
161	.disable = regulator_disable_regmap,
162	.is_enabled = regulator_is_enabled_regmap,
163	.list_voltage = regulator_list_voltage_linear,
164	.map_voltage = regulator_map_voltage_linear,
165	.get_voltage_sel = regulator_get_voltage_sel_regmap,
166	.set_voltage_sel = regulator_set_voltage_sel_regmap,
167	.set_active_discharge = regulator_set_active_discharge_regmap,
168	.set_soft_start = regulator_set_soft_start_regmap,
169	.set_ramp_delay = mpq7920_set_ramp_delay,
170	};
171
172	static struct regulator_desc mpq7920_regulators_desc[MPQ7920_MAX_REGULATORS] = {
173	MPQ7920BUCK("buck1", 1, mpq7920_I_limits1),
174	MPQ7920BUCK("buck2", 2, mpq7920_I_limits2),
175	MPQ7920BUCK("buck3", 3, mpq7920_I_limits1),
176	MPQ7920BUCK("buck4", 4, mpq7920_I_limits2),
177	MPQ7920LDO("ldortc", 1, &mpq7920_ldortc_ops, NULL, 0, 0, 0),
178	MPQ7920LDO("ldo2", 2, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),
179	MPQ7920LDO("ldo3", 3, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),
180	MPQ7920LDO("ldo4", 4, &mpq7920_ldo_ops, mpq7920_I_limits3,
181	ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO4_REG_B,
182	MPQ7920_MASK_LDO_ILIM),
183	MPQ7920LDO("ldo5", 5, &mpq7920_ldo_ops, mpq7920_I_limits3,
184	ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO5_REG_B,
185	MPQ7920_MASK_LDO_ILIM),
186	};
187
188	/*
189	* DVS ramp rate BUCK1 to BUCK4
190	* 00-01: Reserved
191	* 10: 8mV/us
192	* 11: 4mV/us
193	*/
194	static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
195	{
196	unsigned int ramp_val;
197
198	if (ramp_delay > 8000 \|\| ramp_delay < 0)
199	return -EINVAL;
200
201	if (ramp_delay <= 4000)
202	ramp_val = 3;
203	else
204	ramp_val = 2;
205
206	return regmap_update_bits(rdev->regmap, MPQ7920_REG_CTL0,
207	MPQ7920_MASK_DVS_SLEWRATE, ramp_val << 6);
208	}
209
210	static int mpq7920_parse_cb(struct device_node *np,
211	const struct regulator_desc *desc,
212	struct regulator_config *config)
213	{
214	uint8_t val;
215	int ret;
216	struct mpq7920_regulator_info *info = config->driver_data;
217	struct regulator_desc *rdesc = &info->rdesc[desc->id];
218
219	if (of_property_read_bool(np, "mps,buck-ovp-disable")) {
220	regmap_update_bits(config->regmap,
221	MPQ7920_BUCK1_REG_B + (rdesc->id * 4),
686f6361	222	MPQ7920_MASK_OVP, MPQ7920_OVP_DISABLE);
6501c1f5 SS	223	}
	224
	225	ret = of_property_read_u8(np, "mps,buck-phase-delay", &val);
	226	if (!ret) {
	227	regmap_update_bits(config->regmap,
	228	MPQ7920_BUCK1_REG_C + (rdesc->id * 4),
	229	MPQ7920_MASK_BUCK_PHASE_DEALY,
	230	(val & 3) << 4);
	231	}
	232
	233	ret = of_property_read_u8(np, "mps,buck-softstart", &val);
	234	if (!ret)
	235	rdesc->soft_start_val_on = (val & 3) << 2;
	236
	237	return 0;
	238	}
	239
	240	static void mpq7920_parse_dt(struct device *dev,
	241	struct mpq7920_regulator_info *info)
	242	{
	243	int ret;
	244	struct device_node *np = dev->of_node;
	245	uint8_t freq;
	246
	247	np = of_get_child_by_name(np, "regulators");
	248	if (!np) {
	249	dev_err(dev, "missing 'regulators' subnode in DT\n");
	250	return;
	251	}
	252
	253	ret = of_property_read_u8(np, "mps,switch-freq", &freq);
	254	if (!ret) {
	255	regmap_update_bits(info->regmap, MPQ7920_REG_CTL0,
	256	MPQ7920_MASK_SWITCH_FREQ,
	257	(freq & 3) << 4);
	258	}
	259
	260	of_node_put(np);
	261	}
	262
5b379b2b	263	static int mpq7920_i2c_probe(struct i2c_client *client)
6501c1f5 SS	264	{
	265	struct device *dev = &client->dev;
	266	struct mpq7920_regulator_info *info;
	267	struct regulator_config config = { NULL, };
489d6954	268	struct regulator_dev *rdev;
6501c1f5	269	struct regmap *regmap;
489d6954	270	int i;
6501c1f5 SS	271
	272	info = devm_kzalloc(dev, sizeof(struct mpq7920_regulator_info),
	273	GFP_KERNEL);
	274	if (!info)
	275	return -ENOMEM;
	276
6501c1f5 SS	277	info->rdesc = mpq7920_regulators_desc;
	278	regmap = devm_regmap_init_i2c(client, &mpq7920_regmap_config);
	279	if (IS_ERR(regmap)) {
	280	dev_err(dev, "Failed to allocate regmap!\n");
	281	return PTR_ERR(regmap);
	282	}
	283
	284	i2c_set_clientdata(client, info);
	285	info->regmap = regmap;
	286	if (client->dev.of_node)
	287	mpq7920_parse_dt(&client->dev, info);
	288
489d6954	289	config.dev = dev;
6501c1f5 SS	290	config.regmap = regmap;
	291	config.driver_data = info;
	292
489d6954 AL	293	for (i = 0; i < MPQ7920_MAX_REGULATORS; i++) {
	294	rdev = devm_regulator_register(dev,
	295	&mpq7920_regulators_desc[i],
	296	&config);
	297	if (IS_ERR(rdev)) {
	298	dev_err(dev, "Failed to register regulator!\n");
	299	return PTR_ERR(rdev);
	300	}
	301	}
6501c1f5	302
489d6954	303	return 0;
6501c1f5 SS	304	}
	305
	306	static const struct of_device_id mpq7920_of_match[] = {
	307	{ .compatible = "mps,mpq7920"},
	308	{},
	309	};
	310	MODULE_DEVICE_TABLE(of, mpq7920_of_match);
	311
	312	static const struct i2c_device_id mpq7920_id[] = {
	313	{ "mpq7920", },
	314	{ },
	315	};
	316	MODULE_DEVICE_TABLE(i2c, mpq7920_id);
	317
	318	static struct i2c_driver mpq7920_regulator_driver = {
	319	.driver = {
	320	.name = "mpq7920",
	321	.of_match_table = of_match_ptr(mpq7920_of_match),
	322	},
5b379b2b	323	.probe_new = mpq7920_i2c_probe,
6501c1f5 SS	324	.id_table = mpq7920_id,
	325	};
	326	module_i2c_driver(mpq7920_regulator_driver);
	327
	328	MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
	329	MODULE_DESCRIPTION("MPQ7920 PMIC regulator driver");
	330	MODULE_LICENSE("GPL");