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/module.h>
12 #include <linux/of_device.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 
30 static const struct regmap_config tps6287x_regmap_config = {
31 	.reg_bits = 8,
32 	.val_bits = 8,
33 	.max_register = TPS6287X_STATUS,
34 };
35 
36 static 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 
43 static const unsigned int tps6287x_voltage_range_sel[] = {
44 	0x0, 0x4, 0x8, 0xC
45 };
46 
47 static const unsigned int tps6287x_ramp_table[] = {
48 	10000, 5000, 1250, 500
49 };
50 
51 static 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 
70 static 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 
83 static 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 
94 static 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 
106 static 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,
123 	.linear_ranges = tps6287x_voltage_ranges,
124 	.n_linear_ranges = ARRAY_SIZE(tps6287x_voltage_ranges),
125 	.linear_range_selectors = tps6287x_voltage_range_sel,
126 };
127 
128 static 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 
156 static 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 
164 MODULE_DEVICE_TABLE(of, tps6287x_dt_ids);
165 
166 static const struct i2c_device_id tps6287x_i2c_id[] = {
167 	{ "tps62870", 0 },
168 	{ "tps62871", 0 },
169 	{ "tps62872", 0 },
170 	{ "tps62873", 0 },
171 	{},
172 };
173 
174 MODULE_DEVICE_TABLE(i2c, tps6287x_i2c_id);
175 
176 static 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 
185 module_i2c_driver(tps6287x_regulator_driver);
186 
187 MODULE_AUTHOR("Mårten Lindahl <marten.lindahl@axis.com>");
188 MODULE_DESCRIPTION("Regulator driver for TI TPS6287X PMIC");
189 MODULE_LICENSE("GPL");
190