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
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, 0x1, 0x2, 0x3
45 };
46
47 static const unsigned int tps6287x_voltage_range_prefix[] = {
48 0x000, 0x100, 0x200, 0x300
49 };
50
51 static const unsigned int tps6287x_ramp_table[] = {
52 10000, 5000, 1250, 500
53 };
54
55 struct tps6287x_reg_data {
56 int range;
57 };
58
tps6287x_best_range(struct regulator_config * config,const struct regulator_desc * desc)59 static int tps6287x_best_range(struct regulator_config *config, const struct regulator_desc *desc)
60 {
61 const struct linear_range *r;
62 int i;
63
64 if (!config->init_data->constraints.apply_uV)
65 return -1;
66
67 for (i = 0; i < desc->n_linear_ranges; i++) {
68 r = &desc->linear_ranges[i];
69 if (r->min <= config->init_data->constraints.min_uV &&
70 config->init_data->constraints.max_uV <= linear_range_get_max_value(r))
71 return i;
72 }
73 return -1;
74 }
75
tps6287x_set_mode(struct regulator_dev * rdev,unsigned int mode)76 static int tps6287x_set_mode(struct regulator_dev *rdev, unsigned int mode)
77 {
78 unsigned int val;
79
80 switch (mode) {
81 case REGULATOR_MODE_NORMAL:
82 val = 0;
83 break;
84 case REGULATOR_MODE_FAST:
85 val = TPS6287X_CTRL1_FPWMEN;
86 break;
87 default:
88 return -EINVAL;
89 }
90
91 return regmap_update_bits(rdev->regmap, TPS6287X_CTRL1,
92 TPS6287X_CTRL1_FPWMEN, val);
93 }
94
tps6287x_get_mode(struct regulator_dev * rdev)95 static unsigned int tps6287x_get_mode(struct regulator_dev *rdev)
96 {
97 unsigned int val;
98 int ret;
99
100 ret = regmap_read(rdev->regmap, TPS6287X_CTRL1, &val);
101 if (ret < 0)
102 return 0;
103
104 return (val & TPS6287X_CTRL1_FPWMEN) ? REGULATOR_MODE_FAST :
105 REGULATOR_MODE_NORMAL;
106 }
107
tps6287x_of_map_mode(unsigned int mode)108 static unsigned int tps6287x_of_map_mode(unsigned int mode)
109 {
110 switch (mode) {
111 case REGULATOR_MODE_NORMAL:
112 case REGULATOR_MODE_FAST:
113 return mode;
114 default:
115 return REGULATOR_MODE_INVALID;
116 }
117 }
118
tps6287x_map_voltage(struct regulator_dev * rdev,int min_uV,int max_uV)119 static int tps6287x_map_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
120 {
121 struct tps6287x_reg_data *data = (struct tps6287x_reg_data *)rdev->reg_data;
122 struct linear_range selected_range;
123 int selector, voltage;
124
125 if (!data || data->range == -1)
126 return regulator_map_voltage_pickable_linear_range(rdev, min_uV, max_uV);
127
128 selected_range = rdev->desc->linear_ranges[data->range];
129 selector = DIV_ROUND_UP(min_uV - selected_range.min, selected_range.step);
130 if (selector < selected_range.min_sel || selector > selected_range.max_sel)
131 return -EINVAL;
132
133 selector |= tps6287x_voltage_range_prefix[data->range];
134 voltage = rdev->desc->ops->list_voltage(rdev, selector);
135 if (voltage < min_uV || voltage > max_uV)
136 return -EINVAL;
137
138 return selector;
139 }
140
141 static const struct regulator_ops tps6287x_regulator_ops = {
142 .enable = regulator_enable_regmap,
143 .disable = regulator_disable_regmap,
144 .set_mode = tps6287x_set_mode,
145 .get_mode = tps6287x_get_mode,
146 .is_enabled = regulator_is_enabled_regmap,
147 .get_voltage_sel = regulator_get_voltage_sel_pickable_regmap,
148 .set_voltage_sel = regulator_set_voltage_sel_pickable_regmap,
149 .list_voltage = regulator_list_voltage_pickable_linear_range,
150 .map_voltage = tps6287x_map_voltage,
151 .set_ramp_delay = regulator_set_ramp_delay_regmap,
152 };
153
154 static const struct regulator_desc tps6287x_reg = {
155 .name = "tps6287x",
156 .owner = THIS_MODULE,
157 .ops = &tps6287x_regulator_ops,
158 .of_map_mode = tps6287x_of_map_mode,
159 .type = REGULATOR_VOLTAGE,
160 .enable_reg = TPS6287X_CTRL1,
161 .enable_mask = TPS6287X_CTRL1_SWEN,
162 .vsel_reg = TPS6287X_VSET,
163 .vsel_mask = 0xFF,
164 .vsel_range_reg = TPS6287X_CTRL2,
165 .vsel_range_mask = TPS6287X_CTRL2_VRANGE,
166 .range_applied_by_vsel = true,
167 .ramp_reg = TPS6287X_CTRL1,
168 .ramp_mask = TPS6287X_CTRL1_VRAMP,
169 .ramp_delay_table = tps6287x_ramp_table,
170 .n_ramp_values = ARRAY_SIZE(tps6287x_ramp_table),
171 .n_voltages = 256 * ARRAY_SIZE(tps6287x_voltage_ranges),
172 .linear_ranges = tps6287x_voltage_ranges,
173 .n_linear_ranges = ARRAY_SIZE(tps6287x_voltage_ranges),
174 .linear_range_selectors_bitfield = tps6287x_voltage_range_sel,
175 };
176
tps6287x_i2c_probe(struct i2c_client * i2c)177 static int tps6287x_i2c_probe(struct i2c_client *i2c)
178 {
179 struct device *dev = &i2c->dev;
180 struct regulator_config config = {};
181 struct tps6287x_reg_data *reg_data;
182 struct regulator_dev *rdev;
183
184 reg_data = devm_kzalloc(dev, sizeof(struct tps6287x_reg_data), GFP_KERNEL);
185
186 if (!reg_data)
187 return -ENOMEM;
188
189 config.regmap = devm_regmap_init_i2c(i2c, &tps6287x_regmap_config);
190 if (IS_ERR(config.regmap)) {
191 dev_err(dev, "Failed to init i2c\n");
192 return PTR_ERR(config.regmap);
193 }
194
195 config.dev = dev;
196 config.of_node = dev->of_node;
197 config.init_data = of_get_regulator_init_data(dev, dev->of_node,
198 &tps6287x_reg);
199
200 reg_data->range = tps6287x_best_range(&config, &tps6287x_reg);
201
202 rdev = devm_regulator_register(dev, &tps6287x_reg, &config);
203 if (IS_ERR(rdev)) {
204 dev_err(dev, "Failed to register regulator\n");
205 return PTR_ERR(rdev);
206 }
207
208 rdev->reg_data = (void *)reg_data;
209 dev_dbg(dev, "Probed regulator\n");
210
211 return 0;
212 }
213
214 static const struct of_device_id tps6287x_dt_ids[] = {
215 { .compatible = "ti,tps62870", },
216 { .compatible = "ti,tps62871", },
217 { .compatible = "ti,tps62872", },
218 { .compatible = "ti,tps62873", },
219 { }
220 };
221
222 MODULE_DEVICE_TABLE(of, tps6287x_dt_ids);
223
224 static const struct i2c_device_id tps6287x_i2c_id[] = {
225 { "tps62870" },
226 { "tps62871" },
227 { "tps62872" },
228 { "tps62873" },
229 {}
230 };
231
232 MODULE_DEVICE_TABLE(i2c, tps6287x_i2c_id);
233
234 static struct i2c_driver tps6287x_regulator_driver = {
235 .driver = {
236 .name = "tps6287x",
237 .of_match_table = tps6287x_dt_ids,
238 },
239 .probe = tps6287x_i2c_probe,
240 .id_table = tps6287x_i2c_id,
241 };
242
243 module_i2c_driver(tps6287x_regulator_driver);
244
245 MODULE_AUTHOR("Mårten Lindahl <[email protected]>");
246 MODULE_DESCRIPTION("Regulator driver for TI TPS6287X PMIC");
247 MODULE_LICENSE("GPL");
248