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