tps6286x-regulator.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2// Copyright Axis Communications AB
  3
  4#include <linux/err.h>
  5#include <linux/i2c.h>
  6#include <linux/module.h>
  7#include <linux/of.h>
  8#include <linux/regmap.h>
  9#include <linux/regulator/of_regulator.h>
 10#include <linux/regulator/machine.h>
 11#include <linux/regulator/driver.h>
 12
 13#include <dt-bindings/regulator/ti,tps62864.h>
 14
 15#define TPS6286X_VOUT1		0x01
 16#define TPS6286X_VOUT1_VO1_SET	GENMASK(7, 0)
 17
 18#define TPS6286X_CONTROL	0x03
 19#define TPS6286X_CONTROL_FPWM	BIT(4)
 20#define TPS6286X_CONTROL_SWEN	BIT(5)
 21
 22#define TPS6286X_STATUS		0x05
 23
 24#define TPS6286X_MIN_MV		400
 25#define TPS6286X_MAX_MV		1675
 26#define TPS6286X_STEP_MV	5
 27
 28static bool tps6286x_volatile_reg(struct device *dev, unsigned int reg)
 29{
 30	return reg == TPS6286X_STATUS;
 31}
 32
 33static const struct regmap_config tps6286x_regmap_config = {
 34	.reg_bits = 8,
 35	.val_bits = 8,
 36	.cache_type = REGCACHE_MAPLE,
 37	.volatile_reg = tps6286x_volatile_reg,
 38};
 39
 40static int tps6286x_set_mode(struct regulator_dev *rdev, unsigned int mode)
 41{
 42	unsigned int val;
 43
 44	switch (mode) {
 45	case REGULATOR_MODE_NORMAL:
 46		val = 0;
 47		break;
 48	case REGULATOR_MODE_FAST:
 49		val = TPS6286X_CONTROL_FPWM;
 50		break;
 51	default:
 52		return -EINVAL;
 53	}
 54
 55	return regmap_update_bits(rdev->regmap, TPS6286X_CONTROL,
 56				  TPS6286X_CONTROL_FPWM, val);
 57}
 58
 59static unsigned int tps6286x_get_mode(struct regulator_dev *rdev)
 60{
 61	unsigned int val;
 62	int ret;
 63
 64	ret = regmap_read(rdev->regmap, TPS6286X_CONTROL, &val);
 65	if (ret < 0)
 66		return 0;
 67
 68	return (val & TPS6286X_CONTROL_FPWM) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
 69}
 70
 71static const struct regulator_ops tps6286x_regulator_ops = {
 72	.enable = regulator_enable_regmap,
 73	.disable = regulator_disable_regmap,
 74	.set_mode = tps6286x_set_mode,
 75	.get_mode = tps6286x_get_mode,
 76	.is_enabled = regulator_is_enabled_regmap,
 77	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 78	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 79	.list_voltage = regulator_list_voltage_linear,
 80};
 81
 82static unsigned int tps6286x_of_map_mode(unsigned int mode)
 83{
 84	switch (mode) {
 85	case TPS62864_MODE_NORMAL:
 86		return REGULATOR_MODE_NORMAL;
 87	case TPS62864_MODE_FPWM:
 88		return REGULATOR_MODE_FAST;
 89	default:
 90		return REGULATOR_MODE_INVALID;
 91	}
 92}
 93
 94static const struct regulator_desc tps6286x_reg = {
 95	.name = "tps6286x",
 96	.of_match = "SW",
 97	.owner = THIS_MODULE,
 98	.ops = &tps6286x_regulator_ops,
 99	.of_map_mode = tps6286x_of_map_mode,
100	.regulators_node = "regulators",
101	.type = REGULATOR_VOLTAGE,
102	.n_voltages = ((TPS6286X_MAX_MV - TPS6286X_MIN_MV) / TPS6286X_STEP_MV) + 1,
103	.min_uV = TPS6286X_MIN_MV * 1000,
104	.uV_step = TPS6286X_STEP_MV * 1000,
105	.vsel_reg = TPS6286X_VOUT1,
106	.vsel_mask = TPS6286X_VOUT1_VO1_SET,
107	.enable_reg = TPS6286X_CONTROL,
108	.enable_mask = TPS6286X_CONTROL_SWEN,
109	.ramp_delay = 1000,
110	/* tDelay + tRamp, rounded up */
111	.enable_time = 3000,
112};
113
114static const struct of_device_id tps6286x_dt_ids[] = {
115	{ .compatible = "ti,tps62864", },
116	{ .compatible = "ti,tps62866", },
117	{ .compatible = "ti,tps62868", },
118	{ .compatible = "ti,tps62869", },
119	{ }
120};
121MODULE_DEVICE_TABLE(of, tps6286x_dt_ids);
122
123static int tps6286x_i2c_probe(struct i2c_client *i2c)
124{
125	struct device *dev = &i2c->dev;
126	struct regulator_config config = {};
127	struct regulator_dev *rdev;
128	struct regmap *regmap;
129
130	regmap = devm_regmap_init_i2c(i2c, &tps6286x_regmap_config);
131	if (IS_ERR(regmap))
132		return PTR_ERR(regmap);
133
134	config.dev = &i2c->dev;
135	config.of_node = dev->of_node;
136	config.regmap = regmap;
137
138	rdev = devm_regulator_register(&i2c->dev, &tps6286x_reg, &config);
139	if (IS_ERR(rdev)) {
140		dev_err(&i2c->dev, "Failed to register tps6286x regulator\n");
141		return PTR_ERR(rdev);
142	}
143
144	return 0;
145}
146
147static const struct i2c_device_id tps6286x_i2c_id[] = {
148	{ "tps62864" },
149	{ "tps62866" },
150	{ "tps62868" },
151	{ "tps62869" },
152	{}
153};
154MODULE_DEVICE_TABLE(i2c, tps6286x_i2c_id);
155
156static struct i2c_driver tps6286x_regulator_driver = {
157	.driver = {
158		.name = "tps6286x",
159		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
160		.of_match_table = tps6286x_dt_ids,
161	},
162	.probe = tps6286x_i2c_probe,
163	.id_table = tps6286x_i2c_id,
164};
165
166module_i2c_driver(tps6286x_regulator_driver);
167
168MODULE_DESCRIPTION("TI TPS6286x Power Regulator driver");
169MODULE_LICENSE("GPL v2");