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 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	.ramp_reg = TPS6287X_CTRL1,
119	.ramp_mask = TPS6287X_CTRL1_VRAMP,
120	.ramp_delay_table = tps6287x_ramp_table,
121	.n_ramp_values = ARRAY_SIZE(tps6287x_ramp_table),
122	.n_voltages = 256 * ARRAY_SIZE(tps6287x_voltage_ranges),
123	.linear_ranges = tps6287x_voltage_ranges,
124	.n_linear_ranges = ARRAY_SIZE(tps6287x_voltage_ranges),
125	.linear_range_selectors_bitfield = tps6287x_voltage_range_sel,
126};
127
128static int tps6287x_i2c_probe(struct i2c_client *i2c)
129{
130	struct device *dev = &i2c->dev;
131	struct regulator_config config = {};
132	struct regulator_dev *rdev;
133
134	config.regmap = devm_regmap_init_i2c(i2c, &tps6287x_regmap_config);
135	if (IS_ERR(config.regmap)) {
136		dev_err(dev, "Failed to init i2c\n");
137		return PTR_ERR(config.regmap);
138	}
139
140	config.dev = dev;
141	config.of_node = dev->of_node;
142	config.init_data = of_get_regulator_init_data(dev, dev->of_node,
143						      &tps6287x_reg);
144
145	rdev = devm_regulator_register(dev, &tps6287x_reg, &config);
146	if (IS_ERR(rdev)) {
147		dev_err(dev, "Failed to register regulator\n");
148		return PTR_ERR(rdev);
149	}
150
151	dev_dbg(dev, "Probed regulator\n");
152
153	return 0;
154}
155
156static const struct of_device_id tps6287x_dt_ids[] = {
157	{ .compatible = "ti,tps62870", },
158	{ .compatible = "ti,tps62871", },
159	{ .compatible = "ti,tps62872", },
160	{ .compatible = "ti,tps62873", },
161	{ }
162};
163
164MODULE_DEVICE_TABLE(of, tps6287x_dt_ids);
165
166static const struct i2c_device_id tps6287x_i2c_id[] = {
167	{ "tps62870", 0 },
168	{ "tps62871", 0 },
169	{ "tps62872", 0 },
170	{ "tps62873", 0 },
171	{},
172};
173
174MODULE_DEVICE_TABLE(i2c, tps6287x_i2c_id);
175
176static struct i2c_driver tps6287x_regulator_driver = {
177	.driver = {
178		.name = "tps6287x",
179		.of_match_table = tps6287x_dt_ids,
180	},
181	.probe = tps6287x_i2c_probe,
182	.id_table = tps6287x_i2c_id,
183};
184
185module_i2c_driver(tps6287x_regulator_driver);
186
187MODULE_AUTHOR("M��rten Lindahl <marten.lindahl@axis.com>");
188MODULE_DESCRIPTION("Regulator driver for TI TPS6287X PMIC");
189MODULE_LICENSE("GPL");
190