1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2023 Axis Communications AB
  4 *
  5 * Driver for Texas Instruments TPS6287x PMIC.
  6 * Datasheet: https://www.ti.com/lit/ds/symlink/tps62873.pdf
  7 */
  8
  9#include <linux/err.h>
 10#include <linux/i2c.h>
 11#include <linux/mod_devicetable.h>
 12#include <linux/module.h>
 13#include <linux/regmap.h>
 14#include <linux/regulator/of_regulator.h>
 15#include <linux/regulator/machine.h>
 16#include <linux/regulator/driver.h>
 17#include <linux/bitfield.h>
 18#include <linux/linear_range.h>
 19
 20#define TPS6287X_VSET		0x00
 21#define TPS6287X_CTRL1		0x01
 22#define TPS6287X_CTRL1_VRAMP	GENMASK(1, 0)
 23#define TPS6287X_CTRL1_FPWMEN	BIT(4)
 24#define TPS6287X_CTRL1_SWEN	BIT(5)
 25#define TPS6287X_CTRL2		0x02
 26#define TPS6287X_CTRL2_VRANGE	GENMASK(3, 2)
 27#define TPS6287X_CTRL3		0x03
 28#define TPS6287X_STATUS		0x04
 29
 30static const struct regmap_config tps6287x_regmap_config = {
 31	.reg_bits = 8,
 32	.val_bits = 8,
 33	.max_register = TPS6287X_STATUS,
 34};
 35
 36static const struct linear_range tps6287x_voltage_ranges[] = {
 37	LINEAR_RANGE(400000, 0, 0xFF, 1250),
 38	LINEAR_RANGE(400000, 0, 0xFF, 2500),
 39	LINEAR_RANGE(400000, 0, 0xFF, 5000),
 40	LINEAR_RANGE(800000, 0, 0xFF, 10000),
 41};
 42
 43static const unsigned int tps6287x_voltage_range_sel[] = {
 44	0x0, 0x1, 0x2, 0x3
 45};
 46
 47static const unsigned int tps6287x_ramp_table[] = {
 48	10000, 5000, 1250, 500
 49};
 50
 51static int tps6287x_set_mode(struct regulator_dev *rdev, unsigned int mode)
 52{
 53	unsigned int val;
 54
 55	switch (mode) {
 56	case REGULATOR_MODE_NORMAL:
 57		val = 0;
 58		break;
 59	case REGULATOR_MODE_FAST:
 60		val = TPS6287X_CTRL1_FPWMEN;
 61		break;
 62	default:
 63		return -EINVAL;
 64	}
 65
 66	return regmap_update_bits(rdev->regmap, TPS6287X_CTRL1,
 67				  TPS6287X_CTRL1_FPWMEN, val);
 68}
 69
 70static unsigned int tps6287x_get_mode(struct regulator_dev *rdev)
 71{
 72	unsigned int val;
 73	int ret;
 74
 75	ret = regmap_read(rdev->regmap, TPS6287X_CTRL1, &val);
 76	if (ret < 0)
 77		return 0;
 78
 79	return (val & TPS6287X_CTRL1_FPWMEN) ? REGULATOR_MODE_FAST :
 80	    REGULATOR_MODE_NORMAL;
 81}
 82
 83static unsigned int tps6287x_of_map_mode(unsigned int mode)
 84{
 85	switch (mode) {
 86	case REGULATOR_MODE_NORMAL:
 87	case REGULATOR_MODE_FAST:
 88		return mode;
 89	default:
 90		return REGULATOR_MODE_INVALID;
 91	}
 92}
 93
 94static const struct regulator_ops tps6287x_regulator_ops = {
 95	.enable = regulator_enable_regmap,
 96	.disable = regulator_disable_regmap,
 97	.set_mode = tps6287x_set_mode,
 98	.get_mode = tps6287x_get_mode,
 99	.is_enabled = regulator_is_enabled_regmap,
100	.get_voltage_sel = regulator_get_voltage_sel_pickable_regmap,
101	.set_voltage_sel = regulator_set_voltage_sel_pickable_regmap,
102	.list_voltage = regulator_list_voltage_pickable_linear_range,
103	.set_ramp_delay = regulator_set_ramp_delay_regmap,
104};
105
106static const struct regulator_desc tps6287x_reg = {
107	.name = "tps6287x",
108	.owner = THIS_MODULE,
109	.ops = &tps6287x_regulator_ops,
110	.of_map_mode = tps6287x_of_map_mode,
111	.type = REGULATOR_VOLTAGE,
112	.enable_reg = TPS6287X_CTRL1,
113	.enable_mask = TPS6287X_CTRL1_SWEN,
114	.vsel_reg = TPS6287X_VSET,
115	.vsel_mask = 0xFF,
116	.vsel_range_reg = TPS6287X_CTRL2,
117	.vsel_range_mask = TPS6287X_CTRL2_VRANGE,
118	.range_applied_by_vsel = true,
119	.ramp_reg = TPS6287X_CTRL1,
120	.ramp_mask = TPS6287X_CTRL1_VRAMP,
121	.ramp_delay_table = tps6287x_ramp_table,
122	.n_ramp_values = ARRAY_SIZE(tps6287x_ramp_table),
123	.n_voltages = 256 * ARRAY_SIZE(tps6287x_voltage_ranges),
124	.linear_ranges = tps6287x_voltage_ranges,
125	.n_linear_ranges = ARRAY_SIZE(tps6287x_voltage_ranges),
126	.linear_range_selectors_bitfield = tps6287x_voltage_range_sel,
127};
128
129static int tps6287x_i2c_probe(struct i2c_client *i2c)
130{
131	struct device *dev = &i2c->dev;
132	struct regulator_config config = {};
133	struct regulator_dev *rdev;
134
135	config.regmap = devm_regmap_init_i2c(i2c, &tps6287x_regmap_config);
136	if (IS_ERR(config.regmap)) {
137		dev_err(dev, "Failed to init i2c\n");
138		return PTR_ERR(config.regmap);
139	}
140
141	config.dev = dev;
142	config.of_node = dev->of_node;
143	config.init_data = of_get_regulator_init_data(dev, dev->of_node,
144						      &tps6287x_reg);
145
146	rdev = devm_regulator_register(dev, &tps6287x_reg, &config);
147	if (IS_ERR(rdev)) {
148		dev_err(dev, "Failed to register regulator\n");
149		return PTR_ERR(rdev);
150	}
151
152	dev_dbg(dev, "Probed regulator\n");
153
154	return 0;
155}
156
157static const struct of_device_id tps6287x_dt_ids[] = {
158	{ .compatible = "ti,tps62870", },
159	{ .compatible = "ti,tps62871", },
160	{ .compatible = "ti,tps62872", },
161	{ .compatible = "ti,tps62873", },
162	{ }
163};
164
165MODULE_DEVICE_TABLE(of, tps6287x_dt_ids);
166
167static const struct i2c_device_id tps6287x_i2c_id[] = {
168	{ "tps62870" },
169	{ "tps62871" },
170	{ "tps62872" },
171	{ "tps62873" },
172	{}
173};
174
175MODULE_DEVICE_TABLE(i2c, tps6287x_i2c_id);
176
177static struct i2c_driver tps6287x_regulator_driver = {
178	.driver = {
179		.name = "tps6287x",
180		.of_match_table = tps6287x_dt_ids,
181	},
182	.probe = tps6287x_i2c_probe,
183	.id_table = tps6287x_i2c_id,
184};
185
186module_i2c_driver(tps6287x_regulator_driver);
187
188MODULE_AUTHOR("Mårten Lindahl <marten.lindahl@axis.com>");
189MODULE_DESCRIPTION("Regulator driver for TI TPS6287X PMIC");
190MODULE_LICENSE("GPL");