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
23 static const struct linear_range bd70528_buck1_volts[] = {
24 REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x1, 600000),
25 REGULATOR_LINEAR_RANGE(2750000, 0x2, 0xf, 50000),
26 };
27 static const struct 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 };
32 static const struct 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 */
38 static const struct 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 */
46 static const unsigned int led_volts[] = {
47 20000, 30000
48 };
49
bd70528_set_ramp_delay(struct regulator_dev * rdev,int ramp_delay)50 static 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
bd70528_led_set_voltage_sel(struct regulator_dev * rdev,unsigned int sel)67 static 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
85 static 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
96 static 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 };
105
106 static const struct regulator_ops bd70528_led_ops = {
107 .enable = regulator_enable_regmap,
108 .disable = regulator_disable_regmap,
109 .is_enabled = regulator_is_enabled_regmap,
110 .list_voltage = regulator_list_voltage_table,
111 .set_voltage_sel = bd70528_led_set_voltage_sel,
112 .get_voltage_sel = regulator_get_voltage_sel_regmap,
113 };
114
115 static const struct regulator_desc bd70528_desc[] = {
116 {
117 .name = "buck1",
118 .of_match = of_match_ptr("BUCK1"),
119 .regulators_node = of_match_ptr("regulators"),
120 .id = BD70528_BUCK1,
121 .ops = &bd70528_buck_ops,
122 .type = REGULATOR_VOLTAGE,
123 .linear_ranges = bd70528_buck1_volts,
124 .n_linear_ranges = ARRAY_SIZE(bd70528_buck1_volts),
125 .n_voltages = BD70528_BUCK_VOLTS,
126 .enable_reg = BD70528_REG_BUCK1_EN,
127 .enable_mask = BD70528_MASK_RUN_EN,
128 .vsel_reg = BD70528_REG_BUCK1_VOLT,
129 .vsel_mask = BD70528_MASK_BUCK_VOLT,
130 .owner = THIS_MODULE,
131 },
132 {
133 .name = "buck2",
134 .of_match = of_match_ptr("BUCK2"),
135 .regulators_node = of_match_ptr("regulators"),
136 .id = BD70528_BUCK2,
137 .ops = &bd70528_buck_ops,
138 .type = REGULATOR_VOLTAGE,
139 .linear_ranges = bd70528_buck2_volts,
140 .n_linear_ranges = ARRAY_SIZE(bd70528_buck2_volts),
141 .n_voltages = BD70528_BUCK_VOLTS,
142 .enable_reg = BD70528_REG_BUCK2_EN,
143 .enable_mask = BD70528_MASK_RUN_EN,
144 .vsel_reg = BD70528_REG_BUCK2_VOLT,
145 .vsel_mask = BD70528_MASK_BUCK_VOLT,
146 .owner = THIS_MODULE,
147 },
148 {
149 .name = "buck3",
150 .of_match = of_match_ptr("BUCK3"),
151 .regulators_node = of_match_ptr("regulators"),
152 .id = BD70528_BUCK3,
153 .ops = &bd70528_buck_ops,
154 .type = REGULATOR_VOLTAGE,
155 .linear_ranges = bd70528_buck3_volts,
156 .n_linear_ranges = ARRAY_SIZE(bd70528_buck3_volts),
157 .n_voltages = BD70528_BUCK_VOLTS,
158 .enable_reg = BD70528_REG_BUCK3_EN,
159 .enable_mask = BD70528_MASK_RUN_EN,
160 .vsel_reg = BD70528_REG_BUCK3_VOLT,
161 .vsel_mask = BD70528_MASK_BUCK_VOLT,
162 .owner = THIS_MODULE,
163 },
164 {
165 .name = "ldo1",
166 .of_match = of_match_ptr("LDO1"),
167 .regulators_node = of_match_ptr("regulators"),
168 .id = BD70528_LDO1,
169 .ops = &bd70528_ldo_ops,
170 .type = REGULATOR_VOLTAGE,
171 .linear_ranges = bd70528_ldo_volts,
172 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
173 .n_voltages = BD70528_LDO_VOLTS,
174 .enable_reg = BD70528_REG_LDO1_EN,
175 .enable_mask = BD70528_MASK_RUN_EN,
176 .vsel_reg = BD70528_REG_LDO1_VOLT,
177 .vsel_mask = BD70528_MASK_LDO_VOLT,
178 .owner = THIS_MODULE,
179 },
180 {
181 .name = "ldo2",
182 .of_match = of_match_ptr("LDO2"),
183 .regulators_node = of_match_ptr("regulators"),
184 .id = BD70528_LDO2,
185 .ops = &bd70528_ldo_ops,
186 .type = REGULATOR_VOLTAGE,
187 .linear_ranges = bd70528_ldo_volts,
188 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
189 .n_voltages = BD70528_LDO_VOLTS,
190 .enable_reg = BD70528_REG_LDO2_EN,
191 .enable_mask = BD70528_MASK_RUN_EN,
192 .vsel_reg = BD70528_REG_LDO2_VOLT,
193 .vsel_mask = BD70528_MASK_LDO_VOLT,
194 .owner = THIS_MODULE,
195 },
196 {
197 .name = "ldo3",
198 .of_match = of_match_ptr("LDO3"),
199 .regulators_node = of_match_ptr("regulators"),
200 .id = BD70528_LDO3,
201 .ops = &bd70528_ldo_ops,
202 .type = REGULATOR_VOLTAGE,
203 .linear_ranges = bd70528_ldo_volts,
204 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
205 .n_voltages = BD70528_LDO_VOLTS,
206 .enable_reg = BD70528_REG_LDO3_EN,
207 .enable_mask = BD70528_MASK_RUN_EN,
208 .vsel_reg = BD70528_REG_LDO3_VOLT,
209 .vsel_mask = BD70528_MASK_LDO_VOLT,
210 .owner = THIS_MODULE,
211 },
212 {
213 .name = "ldo_led1",
214 .of_match = of_match_ptr("LDO_LED1"),
215 .regulators_node = of_match_ptr("regulators"),
216 .id = BD70528_LED1,
217 .ops = &bd70528_led_ops,
218 .type = REGULATOR_VOLTAGE,
219 .volt_table = &led_volts[0],
220 .n_voltages = ARRAY_SIZE(led_volts),
221 .enable_reg = BD70528_REG_LED_EN,
222 .enable_mask = BD70528_MASK_LED1_EN,
223 .vsel_reg = BD70528_REG_LED_VOLT,
224 .vsel_mask = BD70528_MASK_LED1_VOLT,
225 .owner = THIS_MODULE,
226 },
227 {
228 .name = "ldo_led2",
229 .of_match = of_match_ptr("LDO_LED2"),
230 .regulators_node = of_match_ptr("regulators"),
231 .id = BD70528_LED2,
232 .ops = &bd70528_led_ops,
233 .type = REGULATOR_VOLTAGE,
234 .volt_table = &led_volts[0],
235 .n_voltages = ARRAY_SIZE(led_volts),
236 .enable_reg = BD70528_REG_LED_EN,
237 .enable_mask = BD70528_MASK_LED2_EN,
238 .vsel_reg = BD70528_REG_LED_VOLT,
239 .vsel_mask = BD70528_MASK_LED2_VOLT,
240 .owner = THIS_MODULE,
241 },
242
243 };
244
bd70528_probe(struct platform_device * pdev)245 static int bd70528_probe(struct platform_device *pdev)
246 {
247 int i;
248 struct regulator_config config = {
249 .dev = pdev->dev.parent,
250 };
251
252 config.regmap = dev_get_regmap(pdev->dev.parent, NULL);
253 if (!config.regmap)
254 return -ENODEV;
255
256 for (i = 0; i < ARRAY_SIZE(bd70528_desc); i++) {
257 struct regulator_dev *rdev;
258
259 rdev = devm_regulator_register(&pdev->dev, &bd70528_desc[i],
260 &config);
261 if (IS_ERR(rdev)) {
262 dev_err(&pdev->dev,
263 "failed to register %s regulator\n",
264 bd70528_desc[i].name);
265 return PTR_ERR(rdev);
266 }
267 }
268 return 0;
269 }
270
271 static struct platform_driver bd70528_regulator = {
272 .driver = {
273 .name = "bd70528-pmic"
274 },
275 .probe = bd70528_probe,
276 };
277
278 module_platform_driver(bd70528_regulator);
279
280 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
281 MODULE_DESCRIPTION("BD70528 voltage regulator driver");
282 MODULE_LICENSE("GPL");
283 MODULE_ALIAS("platform:bd70528-pmic");
284