tjh.dev
Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2018 ROHM Semiconductors
3// bd70528-regulator.c ROHM BD70528MWV regulator driver
4
5#include <linux/delay.h>
6#include <linux/err.h>
7#include <linux/interrupt.h>
8#include <linux/kernel.h>
9#include <linux/mfd/rohm-bd70528.h>
10#include <linux/module.h>
11#include <linux/of.h>
12#include <linux/platform_device.h>
13#include <linux/regmap.h>
14#include <linux/regulator/driver.h>
15#include <linux/regulator/machine.h>
16#include <linux/regulator/of_regulator.h>
17#include <linux/slab.h>
18
19#define BUCK_RAMPRATE_250MV 0
20#define BUCK_RAMPRATE_125MV 1
21#define BUCK_RAMP_MAX 250
22
23static const struct regulator_linear_range bd70528_buck1_volts[] = {
24 REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x1, 600000),
25 REGULATOR_LINEAR_RANGE(2750000, 0x2, 0xf, 50000),
26};
27static const struct regulator_linear_range bd70528_buck2_volts[] = {
28 REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x1, 300000),
29 REGULATOR_LINEAR_RANGE(1550000, 0x2, 0xd, 50000),
30 REGULATOR_LINEAR_RANGE(3000000, 0xe, 0xf, 300000),
31};
32static const struct regulator_linear_range bd70528_buck3_volts[] = {
33 REGULATOR_LINEAR_RANGE(800000, 0x00, 0xd, 50000),
34 REGULATOR_LINEAR_RANGE(1800000, 0xe, 0xf, 0),
35};
36
37/* All LDOs have same voltage ranges */
38static const struct regulator_linear_range bd70528_ldo_volts[] = {
39 REGULATOR_LINEAR_RANGE(1650000, 0x0, 0x07, 50000),
40 REGULATOR_LINEAR_RANGE(2100000, 0x8, 0x0f, 100000),
41 REGULATOR_LINEAR_RANGE(2850000, 0x10, 0x19, 50000),
42 REGULATOR_LINEAR_RANGE(3300000, 0x19, 0x1f, 0),
43};
44
45/* Also both LEDs support same voltages */
46static const unsigned int led_volts[] = {
47 20000, 30000
48};
49
50static int bd70528_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
51{
52 if (ramp_delay > 0 && ramp_delay <= BUCK_RAMP_MAX) {
53 unsigned int ramp_value = BUCK_RAMPRATE_250MV;
54
55 if (ramp_delay <= 125)
56 ramp_value = BUCK_RAMPRATE_125MV;
57
58 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
59 BD70528_MASK_BUCK_RAMP,
60 ramp_value << BD70528_SIFT_BUCK_RAMP);
61 }
62 dev_err(&rdev->dev, "%s: ramp_delay: %d not supported\n",
63 rdev->desc->name, ramp_delay);
64 return -EINVAL;
65}
66
67static int bd70528_led_set_voltage_sel(struct regulator_dev *rdev,
68 unsigned int sel)
69{
70 int ret;
71
72 ret = regulator_is_enabled_regmap(rdev);
73 if (ret < 0)
74 return ret;
75
76 if (ret == 0)
77 return regulator_set_voltage_sel_regmap(rdev, sel);
78
79 dev_err(&rdev->dev,
80 "LED voltage change not allowed when led is enabled\n");
81
82 return -EBUSY;
83}
84
85static const struct regulator_ops bd70528_buck_ops = {
86 .enable = regulator_enable_regmap,
87 .disable = regulator_disable_regmap,
88 .is_enabled = regulator_is_enabled_regmap,
89 .list_voltage = regulator_list_voltage_linear_range,
90 .set_voltage_sel = regulator_set_voltage_sel_regmap,
91 .get_voltage_sel = regulator_get_voltage_sel_regmap,
92 .set_voltage_time_sel = regulator_set_voltage_time_sel,
93 .set_ramp_delay = bd70528_set_ramp_delay,
94};
95
96static const struct regulator_ops bd70528_ldo_ops = {
97 .enable = regulator_enable_regmap,
98 .disable = regulator_disable_regmap,
99 .is_enabled = regulator_is_enabled_regmap,
100 .list_voltage = regulator_list_voltage_linear_range,
101 .set_voltage_sel = regulator_set_voltage_sel_regmap,
102 .get_voltage_sel = regulator_get_voltage_sel_regmap,
103 .set_voltage_time_sel = regulator_set_voltage_time_sel,
104 .set_ramp_delay = bd70528_set_ramp_delay,
105};
106
107static const struct regulator_ops bd70528_led_ops = {
108 .enable = regulator_enable_regmap,
109 .disable = regulator_disable_regmap,
110 .is_enabled = regulator_is_enabled_regmap,
111 .list_voltage = regulator_list_voltage_table,
112 .set_voltage_sel = bd70528_led_set_voltage_sel,
113 .get_voltage_sel = regulator_get_voltage_sel_regmap,
114};
115
116static const struct regulator_desc bd70528_desc[] = {
117 {
118 .name = "buck1",
119 .of_match = of_match_ptr("BUCK1"),
120 .regulators_node = of_match_ptr("regulators"),
121 .id = BD70528_BUCK1,
122 .ops = &bd70528_buck_ops,
123 .type = REGULATOR_VOLTAGE,
124 .linear_ranges = bd70528_buck1_volts,
125 .n_linear_ranges = ARRAY_SIZE(bd70528_buck1_volts),
126 .n_voltages = BD70528_BUCK_VOLTS,
127 .enable_reg = BD70528_REG_BUCK1_EN,
128 .enable_mask = BD70528_MASK_RUN_EN,
129 .vsel_reg = BD70528_REG_BUCK1_VOLT,
130 .vsel_mask = BD70528_MASK_BUCK_VOLT,
131 .owner = THIS_MODULE,
132 },
133 {
134 .name = "buck2",
135 .of_match = of_match_ptr("BUCK2"),
136 .regulators_node = of_match_ptr("regulators"),
137 .id = BD70528_BUCK2,
138 .ops = &bd70528_buck_ops,
139 .type = REGULATOR_VOLTAGE,
140 .linear_ranges = bd70528_buck2_volts,
141 .n_linear_ranges = ARRAY_SIZE(bd70528_buck2_volts),
142 .n_voltages = BD70528_BUCK_VOLTS,
143 .enable_reg = BD70528_REG_BUCK2_EN,
144 .enable_mask = BD70528_MASK_RUN_EN,
145 .vsel_reg = BD70528_REG_BUCK2_VOLT,
146 .vsel_mask = BD70528_MASK_BUCK_VOLT,
147 .owner = THIS_MODULE,
148 },
149 {
150 .name = "buck3",
151 .of_match = of_match_ptr("BUCK3"),
152 .regulators_node = of_match_ptr("regulators"),
153 .id = BD70528_BUCK3,
154 .ops = &bd70528_buck_ops,
155 .type = REGULATOR_VOLTAGE,
156 .linear_ranges = bd70528_buck3_volts,
157 .n_linear_ranges = ARRAY_SIZE(bd70528_buck3_volts),
158 .n_voltages = BD70528_BUCK_VOLTS,
159 .enable_reg = BD70528_REG_BUCK3_EN,
160 .enable_mask = BD70528_MASK_RUN_EN,
161 .vsel_reg = BD70528_REG_BUCK3_VOLT,
162 .vsel_mask = BD70528_MASK_BUCK_VOLT,
163 .owner = THIS_MODULE,
164 },
165 {
166 .name = "ldo1",
167 .of_match = of_match_ptr("LDO1"),
168 .regulators_node = of_match_ptr("regulators"),
169 .id = BD70528_LDO1,
170 .ops = &bd70528_ldo_ops,
171 .type = REGULATOR_VOLTAGE,
172 .linear_ranges = bd70528_ldo_volts,
173 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
174 .n_voltages = BD70528_LDO_VOLTS,
175 .enable_reg = BD70528_REG_LDO1_EN,
176 .enable_mask = BD70528_MASK_RUN_EN,
177 .vsel_reg = BD70528_REG_LDO1_VOLT,
178 .vsel_mask = BD70528_MASK_LDO_VOLT,
179 .owner = THIS_MODULE,
180 },
181 {
182 .name = "ldo2",
183 .of_match = of_match_ptr("LDO2"),
184 .regulators_node = of_match_ptr("regulators"),
185 .id = BD70528_LDO2,
186 .ops = &bd70528_ldo_ops,
187 .type = REGULATOR_VOLTAGE,
188 .linear_ranges = bd70528_ldo_volts,
189 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
190 .n_voltages = BD70528_LDO_VOLTS,
191 .enable_reg = BD70528_REG_LDO2_EN,
192 .enable_mask = BD70528_MASK_RUN_EN,
193 .vsel_reg = BD70528_REG_LDO2_VOLT,
194 .vsel_mask = BD70528_MASK_LDO_VOLT,
195 .owner = THIS_MODULE,
196 },
197 {
198 .name = "ldo3",
199 .of_match = of_match_ptr("LDO3"),
200 .regulators_node = of_match_ptr("regulators"),
201 .id = BD70528_LDO3,
202 .ops = &bd70528_ldo_ops,
203 .type = REGULATOR_VOLTAGE,
204 .linear_ranges = bd70528_ldo_volts,
205 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
206 .n_voltages = BD70528_LDO_VOLTS,
207 .enable_reg = BD70528_REG_LDO3_EN,
208 .enable_mask = BD70528_MASK_RUN_EN,
209 .vsel_reg = BD70528_REG_LDO3_VOLT,
210 .vsel_mask = BD70528_MASK_LDO_VOLT,
211 .owner = THIS_MODULE,
212 },
213 {
214 .name = "ldo_led1",
215 .of_match = of_match_ptr("LDO_LED1"),
216 .regulators_node = of_match_ptr("regulators"),
217 .id = BD70528_LED1,
218 .ops = &bd70528_led_ops,
219 .type = REGULATOR_VOLTAGE,
220 .volt_table = &led_volts[0],
221 .n_voltages = ARRAY_SIZE(led_volts),
222 .enable_reg = BD70528_REG_LED_EN,
223 .enable_mask = BD70528_MASK_LED1_EN,
224 .vsel_reg = BD70528_REG_LED_VOLT,
225 .vsel_mask = BD70528_MASK_LED1_VOLT,
226 .owner = THIS_MODULE,
227 },
228 {
229 .name = "ldo_led2",
230 .of_match = of_match_ptr("LDO_LED2"),
231 .regulators_node = of_match_ptr("regulators"),
232 .id = BD70528_LED2,
233 .ops = &bd70528_led_ops,
234 .type = REGULATOR_VOLTAGE,
235 .volt_table = &led_volts[0],
236 .n_voltages = ARRAY_SIZE(led_volts),
237 .enable_reg = BD70528_REG_LED_EN,
238 .enable_mask = BD70528_MASK_LED2_EN,
239 .vsel_reg = BD70528_REG_LED_VOLT,
240 .vsel_mask = BD70528_MASK_LED2_VOLT,
241 .owner = THIS_MODULE,
242 },
243
244};
245
246static int bd70528_probe(struct platform_device *pdev)
247{
248 struct rohm_regmap_dev *bd70528;
249 int i;
250 struct regulator_config config = {
251 .dev = pdev->dev.parent,
252 };
253
254 bd70528 = dev_get_drvdata(pdev->dev.parent);
255 if (!bd70528) {
256 dev_err(&pdev->dev, "No MFD driver data\n");
257 return -EINVAL;
258 }
259
260 config.regmap = bd70528->regmap;
261
262 for (i = 0; i < ARRAY_SIZE(bd70528_desc); i++) {
263 struct regulator_dev *rdev;
264
265 rdev = devm_regulator_register(&pdev->dev, &bd70528_desc[i],
266 &config);
267 if (IS_ERR(rdev)) {
268 dev_err(&pdev->dev,
269 "failed to register %s regulator\n",
270 bd70528_desc[i].name);
271 return PTR_ERR(rdev);
272 }
273 }
274 return 0;
275}
276
277static struct platform_driver bd70528_regulator = {
278 .driver = {
279 .name = "bd70528-pmic"
280 },
281 .probe = bd70528_probe,
282};
283
284module_platform_driver(bd70528_regulator);
285
286MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
287MODULE_DESCRIPTION("BD70528 voltage regulator driver");
288MODULE_LICENSE("GPL");
289MODULE_ALIAS("platform:bd70528-pmic");