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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Regulator driver for PWM Regulators
4 *
5 * Copyright (C) 2014 - STMicroelectronics Inc.
6 *
7 * Author: Lee Jones <lee.jones@linaro.org>
8 */
9
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/err.h>
13#include <linux/platform_device.h>
14#include <linux/regulator/driver.h>
15#include <linux/regulator/machine.h>
16#include <linux/regulator/of_regulator.h>
17#include <linux/of.h>
18#include <linux/pwm.h>
19#include <linux/gpio/consumer.h>
20
21struct pwm_continuous_reg_data {
22 unsigned int min_uV_dutycycle;
23 unsigned int max_uV_dutycycle;
24 unsigned int dutycycle_unit;
25};
26
27struct pwm_regulator_data {
28 /* Shared */
29 struct pwm_device *pwm;
30
31 /* Voltage table */
32 struct pwm_voltages *duty_cycle_table;
33
34 /* Continuous mode info */
35 struct pwm_continuous_reg_data continuous;
36
37 /* regulator descriptor */
38 struct regulator_desc desc;
39
40 int state;
41
42 /* Enable GPIO */
43 struct gpio_desc *enb_gpio;
44};
45
46struct pwm_voltages {
47 unsigned int uV;
48 unsigned int dutycycle;
49};
50
51/*
52 * Voltage table call-backs
53 */
54static void pwm_regulator_init_state(struct regulator_dev *rdev)
55{
56 struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
57 struct pwm_state pwm_state;
58 unsigned int dutycycle;
59 int i;
60
61 pwm_get_state(drvdata->pwm, &pwm_state);
62 dutycycle = pwm_get_relative_duty_cycle(&pwm_state, 100);
63
64 for (i = 0; i < rdev->desc->n_voltages; i++) {
65 if (dutycycle == drvdata->duty_cycle_table[i].dutycycle) {
66 drvdata->state = i;
67 return;
68 }
69 }
70}
71
72static int pwm_regulator_get_voltage_sel(struct regulator_dev *rdev)
73{
74 struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
75
76 if (drvdata->state < 0)
77 pwm_regulator_init_state(rdev);
78
79 return drvdata->state;
80}
81
82static int pwm_regulator_set_voltage_sel(struct regulator_dev *rdev,
83 unsigned selector)
84{
85 struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
86 struct pwm_state pstate;
87 int ret;
88
89 pwm_init_state(drvdata->pwm, &pstate);
90 pwm_set_relative_duty_cycle(&pstate,
91 drvdata->duty_cycle_table[selector].dutycycle, 100);
92
93 ret = pwm_apply_might_sleep(drvdata->pwm, &pstate);
94 if (ret) {
95 dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);
96 return ret;
97 }
98
99 drvdata->state = selector;
100
101 return 0;
102}
103
104static int pwm_regulator_list_voltage(struct regulator_dev *rdev,
105 unsigned selector)
106{
107 struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
108
109 if (selector >= rdev->desc->n_voltages)
110 return -EINVAL;
111
112 return drvdata->duty_cycle_table[selector].uV;
113}
114
115static int pwm_regulator_enable(struct regulator_dev *dev)
116{
117 struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
118
119 gpiod_set_value_cansleep(drvdata->enb_gpio, 1);
120
121 return pwm_enable(drvdata->pwm);
122}
123
124static int pwm_regulator_disable(struct regulator_dev *dev)
125{
126 struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
127
128 pwm_disable(drvdata->pwm);
129
130 gpiod_set_value_cansleep(drvdata->enb_gpio, 0);
131
132 return 0;
133}
134
135static int pwm_regulator_is_enabled(struct regulator_dev *dev)
136{
137 struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
138
139 if (drvdata->enb_gpio && !gpiod_get_value_cansleep(drvdata->enb_gpio))
140 return false;
141
142 return pwm_is_enabled(drvdata->pwm);
143}
144
145static int pwm_regulator_get_voltage(struct regulator_dev *rdev)
146{
147 struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
148 unsigned int min_uV_duty = drvdata->continuous.min_uV_dutycycle;
149 unsigned int max_uV_duty = drvdata->continuous.max_uV_dutycycle;
150 unsigned int duty_unit = drvdata->continuous.dutycycle_unit;
151 int min_uV = rdev->constraints->min_uV;
152 int max_uV = rdev->constraints->max_uV;
153 int diff_uV = max_uV - min_uV;
154 struct pwm_state pstate;
155 unsigned int diff_duty;
156 unsigned int voltage;
157
158 pwm_get_state(drvdata->pwm, &pstate);
159
160 if (!pstate.enabled) {
161 if (pstate.polarity == PWM_POLARITY_INVERSED)
162 pstate.duty_cycle = pstate.period;
163 else
164 pstate.duty_cycle = 0;
165 }
166
167 voltage = pwm_get_relative_duty_cycle(&pstate, duty_unit);
168 if (voltage < min(max_uV_duty, min_uV_duty) ||
169 voltage > max(max_uV_duty, min_uV_duty))
170 return -ENOTRECOVERABLE;
171
172 /*
173 * The dutycycle for min_uV might be greater than the one for max_uV.
174 * This is happening when the user needs an inversed polarity, but the
175 * PWM device does not support inversing it in hardware.
176 */
177 if (max_uV_duty < min_uV_duty) {
178 voltage = min_uV_duty - voltage;
179 diff_duty = min_uV_duty - max_uV_duty;
180 } else {
181 voltage = voltage - min_uV_duty;
182 diff_duty = max_uV_duty - min_uV_duty;
183 }
184
185 voltage = DIV_ROUND_CLOSEST_ULL((u64)voltage * diff_uV, diff_duty);
186
187 return voltage + min_uV;
188}
189
190static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
191 int req_min_uV, int req_max_uV,
192 unsigned int *selector)
193{
194 struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
195 unsigned int min_uV_duty = drvdata->continuous.min_uV_dutycycle;
196 unsigned int max_uV_duty = drvdata->continuous.max_uV_dutycycle;
197 unsigned int duty_unit = drvdata->continuous.dutycycle_unit;
198 int min_uV = rdev->constraints->min_uV;
199 int max_uV = rdev->constraints->max_uV;
200 int diff_uV = max_uV - min_uV;
201 struct pwm_state pstate;
202 unsigned int diff_duty;
203 unsigned int dutycycle;
204 int ret;
205
206 pwm_init_state(drvdata->pwm, &pstate);
207
208 /*
209 * The dutycycle for min_uV might be greater than the one for max_uV.
210 * This is happening when the user needs an inversed polarity, but the
211 * PWM device does not support inversing it in hardware.
212 */
213 if (max_uV_duty < min_uV_duty)
214 diff_duty = min_uV_duty - max_uV_duty;
215 else
216 diff_duty = max_uV_duty - min_uV_duty;
217
218 dutycycle = DIV_ROUND_CLOSEST_ULL((u64)(req_min_uV - min_uV) *
219 diff_duty,
220 diff_uV);
221
222 if (max_uV_duty < min_uV_duty)
223 dutycycle = min_uV_duty - dutycycle;
224 else
225 dutycycle = min_uV_duty + dutycycle;
226
227 pwm_set_relative_duty_cycle(&pstate, dutycycle, duty_unit);
228
229 ret = pwm_apply_might_sleep(drvdata->pwm, &pstate);
230 if (ret) {
231 dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);
232 return ret;
233 }
234
235 return 0;
236}
237
238static const struct regulator_ops pwm_regulator_voltage_table_ops = {
239 .set_voltage_sel = pwm_regulator_set_voltage_sel,
240 .get_voltage_sel = pwm_regulator_get_voltage_sel,
241 .list_voltage = pwm_regulator_list_voltage,
242 .map_voltage = regulator_map_voltage_iterate,
243 .enable = pwm_regulator_enable,
244 .disable = pwm_regulator_disable,
245 .is_enabled = pwm_regulator_is_enabled,
246};
247
248static const struct regulator_ops pwm_regulator_voltage_continuous_ops = {
249 .get_voltage = pwm_regulator_get_voltage,
250 .set_voltage = pwm_regulator_set_voltage,
251 .enable = pwm_regulator_enable,
252 .disable = pwm_regulator_disable,
253 .is_enabled = pwm_regulator_is_enabled,
254};
255
256static const struct regulator_desc pwm_regulator_desc = {
257 .name = "pwm-regulator",
258 .type = REGULATOR_VOLTAGE,
259 .owner = THIS_MODULE,
260 .supply_name = "pwm",
261};
262
263static int pwm_regulator_init_table(struct platform_device *pdev,
264 struct pwm_regulator_data *drvdata)
265{
266 struct device_node *np = pdev->dev.of_node;
267 struct pwm_voltages *duty_cycle_table;
268 unsigned int length = 0;
269 int ret;
270
271 of_find_property(np, "voltage-table", &length);
272
273 if ((length < sizeof(*duty_cycle_table)) ||
274 (length % sizeof(*duty_cycle_table))) {
275 dev_err(&pdev->dev, "voltage-table length(%d) is invalid\n",
276 length);
277 return -EINVAL;
278 }
279
280 duty_cycle_table = devm_kzalloc(&pdev->dev, length, GFP_KERNEL);
281 if (!duty_cycle_table)
282 return -ENOMEM;
283
284 ret = of_property_read_u32_array(np, "voltage-table",
285 (u32 *)duty_cycle_table,
286 length / sizeof(u32));
287 if (ret) {
288 dev_err(&pdev->dev, "Failed to read voltage-table: %d\n", ret);
289 return ret;
290 }
291
292 drvdata->state = -ENOTRECOVERABLE;
293 drvdata->duty_cycle_table = duty_cycle_table;
294 drvdata->desc.ops = &pwm_regulator_voltage_table_ops;
295 drvdata->desc.n_voltages = length / sizeof(*duty_cycle_table);
296
297 return 0;
298}
299
300static int pwm_regulator_init_continuous(struct platform_device *pdev,
301 struct pwm_regulator_data *drvdata)
302{
303 u32 dutycycle_range[2] = { 0, 100 };
304 u32 dutycycle_unit = 100;
305
306 drvdata->desc.ops = &pwm_regulator_voltage_continuous_ops;
307 drvdata->desc.continuous_voltage_range = true;
308
309 of_property_read_u32_array(pdev->dev.of_node,
310 "pwm-dutycycle-range",
311 dutycycle_range, 2);
312 of_property_read_u32(pdev->dev.of_node, "pwm-dutycycle-unit",
313 &dutycycle_unit);
314
315 if (dutycycle_range[0] > dutycycle_unit ||
316 dutycycle_range[1] > dutycycle_unit)
317 return -EINVAL;
318
319 drvdata->continuous.dutycycle_unit = dutycycle_unit;
320 drvdata->continuous.min_uV_dutycycle = dutycycle_range[0];
321 drvdata->continuous.max_uV_dutycycle = dutycycle_range[1];
322
323 return 0;
324}
325
326static int pwm_regulator_init_boot_on(struct platform_device *pdev,
327 struct pwm_regulator_data *drvdata,
328 const struct regulator_init_data *init_data)
329{
330 struct pwm_state pstate;
331
332 if (!init_data->constraints.boot_on || drvdata->enb_gpio)
333 return 0;
334
335 pwm_get_state(drvdata->pwm, &pstate);
336 if (pstate.enabled)
337 return 0;
338
339 /*
340 * Update the duty cycle so the output does not change
341 * when the regulator core enables the regulator (and
342 * thus the PWM channel).
343 */
344 if (pstate.polarity == PWM_POLARITY_INVERSED)
345 pstate.duty_cycle = pstate.period;
346 else
347 pstate.duty_cycle = 0;
348
349 return pwm_apply_might_sleep(drvdata->pwm, &pstate);
350}
351
352static int pwm_regulator_probe(struct platform_device *pdev)
353{
354 const struct regulator_init_data *init_data;
355 struct pwm_regulator_data *drvdata;
356 struct regulator_dev *regulator;
357 struct regulator_config config = { };
358 struct device_node *np = pdev->dev.of_node;
359 enum gpiod_flags gpio_flags;
360 int ret;
361
362 if (!np) {
363 dev_err(&pdev->dev, "Device Tree node missing\n");
364 return -EINVAL;
365 }
366
367 drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
368 if (!drvdata)
369 return -ENOMEM;
370
371 memcpy(&drvdata->desc, &pwm_regulator_desc, sizeof(drvdata->desc));
372
373 if (of_property_present(np, "voltage-table"))
374 ret = pwm_regulator_init_table(pdev, drvdata);
375 else
376 ret = pwm_regulator_init_continuous(pdev, drvdata);
377 if (ret)
378 return ret;
379
380 init_data = of_get_regulator_init_data(&pdev->dev, np,
381 &drvdata->desc);
382 if (!init_data)
383 return -ENOMEM;
384
385 config.of_node = np;
386 config.dev = &pdev->dev;
387 config.driver_data = drvdata;
388 config.init_data = init_data;
389
390 drvdata->pwm = devm_pwm_get(&pdev->dev, NULL);
391 if (IS_ERR(drvdata->pwm))
392 return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->pwm),
393 "Failed to get PWM\n");
394
395 if (init_data->constraints.boot_on || init_data->constraints.always_on)
396 gpio_flags = GPIOD_OUT_HIGH;
397 else
398 gpio_flags = GPIOD_OUT_LOW;
399 drvdata->enb_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
400 gpio_flags);
401 if (IS_ERR(drvdata->enb_gpio)) {
402 ret = PTR_ERR(drvdata->enb_gpio);
403 dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n", ret);
404 return ret;
405 }
406
407 ret = pwm_adjust_config(drvdata->pwm);
408 if (ret)
409 return ret;
410
411 ret = pwm_regulator_init_boot_on(pdev, drvdata, init_data);
412 if (ret) {
413 dev_err(&pdev->dev, "Failed to apply boot_on settings: %d\n",
414 ret);
415 return ret;
416 }
417
418 regulator = devm_regulator_register(&pdev->dev,
419 &drvdata->desc, &config);
420 if (IS_ERR(regulator)) {
421 ret = PTR_ERR(regulator);
422 dev_err(&pdev->dev, "Failed to register regulator %s: %d\n",
423 drvdata->desc.name, ret);
424 return ret;
425 }
426
427 return 0;
428}
429
430static const struct of_device_id __maybe_unused pwm_of_match[] = {
431 { .compatible = "pwm-regulator" },
432 { },
433};
434MODULE_DEVICE_TABLE(of, pwm_of_match);
435
436static struct platform_driver pwm_regulator_driver = {
437 .driver = {
438 .name = "pwm-regulator",
439 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
440 .of_match_table = of_match_ptr(pwm_of_match),
441 },
442 .probe = pwm_regulator_probe,
443};
444
445module_platform_driver(pwm_regulator_driver);
446
447MODULE_LICENSE("GPL");
448MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org>");
449MODULE_DESCRIPTION("PWM Regulator Driver");
450MODULE_ALIAS("platform:pwm-regulator");
1/*
2 * Regulator driver for PWM Regulators
3 *
4 * Copyright (C) 2014 - STMicroelectronics Inc.
5 *
6 * Author: Lee Jones <lee.jones@linaro.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/delay.h>
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/err.h>
17#include <linux/regulator/driver.h>
18#include <linux/regulator/machine.h>
19#include <linux/regulator/of_regulator.h>
20#include <linux/of.h>
21#include <linux/of_device.h>
22#include <linux/pwm.h>
23
24struct pwm_regulator_data {
25 /* Shared */
26 struct pwm_device *pwm;
27
28 /* Voltage table */
29 struct pwm_voltages *duty_cycle_table;
30
31 /* regulator descriptor */
32 struct regulator_desc desc;
33
34 /* Regulator ops */
35 struct regulator_ops ops;
36
37 int state;
38
39 /* Continuous voltage */
40 int volt_uV;
41};
42
43struct pwm_voltages {
44 unsigned int uV;
45 unsigned int dutycycle;
46};
47
48/**
49 * Voltage table call-backs
50 */
51static int pwm_regulator_get_voltage_sel(struct regulator_dev *rdev)
52{
53 struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
54
55 return drvdata->state;
56}
57
58static int pwm_regulator_set_voltage_sel(struct regulator_dev *rdev,
59 unsigned selector)
60{
61 struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
62 unsigned int pwm_reg_period;
63 int dutycycle;
64 int ret;
65
66 pwm_reg_period = pwm_get_period(drvdata->pwm);
67
68 dutycycle = (pwm_reg_period *
69 drvdata->duty_cycle_table[selector].dutycycle) / 100;
70
71 ret = pwm_config(drvdata->pwm, dutycycle, pwm_reg_period);
72 if (ret) {
73 dev_err(&rdev->dev, "Failed to configure PWM\n");
74 return ret;
75 }
76
77 drvdata->state = selector;
78
79 return 0;
80}
81
82static int pwm_regulator_list_voltage(struct regulator_dev *rdev,
83 unsigned selector)
84{
85 struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
86
87 if (selector >= rdev->desc->n_voltages)
88 return -EINVAL;
89
90 return drvdata->duty_cycle_table[selector].uV;
91}
92
93static int pwm_regulator_enable(struct regulator_dev *dev)
94{
95 struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
96
97 return pwm_enable(drvdata->pwm);
98}
99
100static int pwm_regulator_disable(struct regulator_dev *dev)
101{
102 struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
103
104 pwm_disable(drvdata->pwm);
105
106 return 0;
107}
108
109static int pwm_regulator_is_enabled(struct regulator_dev *dev)
110{
111 struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
112
113 return pwm_is_enabled(drvdata->pwm);
114}
115
116/**
117 * Continuous voltage call-backs
118 */
119static int pwm_voltage_to_duty_cycle_percentage(struct regulator_dev *rdev, int req_uV)
120{
121 int min_uV = rdev->constraints->min_uV;
122 int max_uV = rdev->constraints->max_uV;
123 int diff = max_uV - min_uV;
124
125 return ((req_uV * 100) - (min_uV * 100)) / diff;
126}
127
128static int pwm_regulator_get_voltage(struct regulator_dev *rdev)
129{
130 struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
131
132 return drvdata->volt_uV;
133}
134
135static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
136 int min_uV, int max_uV,
137 unsigned *selector)
138{
139 struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
140 unsigned int ramp_delay = rdev->constraints->ramp_delay;
141 unsigned int period = pwm_get_period(drvdata->pwm);
142 int duty_cycle;
143 int ret;
144
145 duty_cycle = pwm_voltage_to_duty_cycle_percentage(rdev, min_uV);
146
147 ret = pwm_config(drvdata->pwm, (period / 100) * duty_cycle, period);
148 if (ret) {
149 dev_err(&rdev->dev, "Failed to configure PWM\n");
150 return ret;
151 }
152
153 ret = pwm_enable(drvdata->pwm);
154 if (ret) {
155 dev_err(&rdev->dev, "Failed to enable PWM\n");
156 return ret;
157 }
158 drvdata->volt_uV = min_uV;
159
160 /* Delay required by PWM regulator to settle to the new voltage */
161 usleep_range(ramp_delay, ramp_delay + 1000);
162
163 return 0;
164}
165
166static struct regulator_ops pwm_regulator_voltage_table_ops = {
167 .set_voltage_sel = pwm_regulator_set_voltage_sel,
168 .get_voltage_sel = pwm_regulator_get_voltage_sel,
169 .list_voltage = pwm_regulator_list_voltage,
170 .map_voltage = regulator_map_voltage_iterate,
171 .enable = pwm_regulator_enable,
172 .disable = pwm_regulator_disable,
173 .is_enabled = pwm_regulator_is_enabled,
174};
175
176static struct regulator_ops pwm_regulator_voltage_continuous_ops = {
177 .get_voltage = pwm_regulator_get_voltage,
178 .set_voltage = pwm_regulator_set_voltage,
179 .enable = pwm_regulator_enable,
180 .disable = pwm_regulator_disable,
181 .is_enabled = pwm_regulator_is_enabled,
182};
183
184static struct regulator_desc pwm_regulator_desc = {
185 .name = "pwm-regulator",
186 .type = REGULATOR_VOLTAGE,
187 .owner = THIS_MODULE,
188 .supply_name = "pwm",
189};
190
191static int pwm_regulator_init_table(struct platform_device *pdev,
192 struct pwm_regulator_data *drvdata)
193{
194 struct device_node *np = pdev->dev.of_node;
195 struct pwm_voltages *duty_cycle_table;
196 unsigned int length = 0;
197 int ret;
198
199 of_find_property(np, "voltage-table", &length);
200
201 if ((length < sizeof(*duty_cycle_table)) ||
202 (length % sizeof(*duty_cycle_table))) {
203 dev_err(&pdev->dev,
204 "voltage-table length(%d) is invalid\n",
205 length);
206 return -EINVAL;
207 }
208
209 duty_cycle_table = devm_kzalloc(&pdev->dev, length, GFP_KERNEL);
210 if (!duty_cycle_table)
211 return -ENOMEM;
212
213 ret = of_property_read_u32_array(np, "voltage-table",
214 (u32 *)duty_cycle_table,
215 length / sizeof(u32));
216 if (ret) {
217 dev_err(&pdev->dev, "Failed to read voltage-table\n");
218 return ret;
219 }
220
221 drvdata->duty_cycle_table = duty_cycle_table;
222 memcpy(&drvdata->ops, &pwm_regulator_voltage_table_ops,
223 sizeof(drvdata->ops));
224 drvdata->desc.ops = &drvdata->ops;
225 drvdata->desc.n_voltages = length / sizeof(*duty_cycle_table);
226
227 return 0;
228}
229
230static int pwm_regulator_init_continuous(struct platform_device *pdev,
231 struct pwm_regulator_data *drvdata)
232{
233 memcpy(&drvdata->ops, &pwm_regulator_voltage_continuous_ops,
234 sizeof(drvdata->ops));
235 drvdata->desc.ops = &drvdata->ops;
236 drvdata->desc.continuous_voltage_range = true;
237
238 return 0;
239}
240
241static int pwm_regulator_probe(struct platform_device *pdev)
242{
243 const struct regulator_init_data *init_data;
244 struct pwm_regulator_data *drvdata;
245 struct regulator_dev *regulator;
246 struct regulator_config config = { };
247 struct device_node *np = pdev->dev.of_node;
248 int ret;
249
250 if (!np) {
251 dev_err(&pdev->dev, "Device Tree node missing\n");
252 return -EINVAL;
253 }
254
255 drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
256 if (!drvdata)
257 return -ENOMEM;
258
259 memcpy(&drvdata->desc, &pwm_regulator_desc, sizeof(drvdata->desc));
260
261 if (of_find_property(np, "voltage-table", NULL))
262 ret = pwm_regulator_init_table(pdev, drvdata);
263 else
264 ret = pwm_regulator_init_continuous(pdev, drvdata);
265 if (ret)
266 return ret;
267
268 init_data = of_get_regulator_init_data(&pdev->dev, np,
269 &drvdata->desc);
270 if (!init_data)
271 return -ENOMEM;
272
273 config.of_node = np;
274 config.dev = &pdev->dev;
275 config.driver_data = drvdata;
276 config.init_data = init_data;
277
278 drvdata->pwm = devm_pwm_get(&pdev->dev, NULL);
279 if (IS_ERR(drvdata->pwm)) {
280 dev_err(&pdev->dev, "Failed to get PWM\n");
281 return PTR_ERR(drvdata->pwm);
282 }
283
284 regulator = devm_regulator_register(&pdev->dev,
285 &drvdata->desc, &config);
286 if (IS_ERR(regulator)) {
287 dev_err(&pdev->dev, "Failed to register regulator %s\n",
288 drvdata->desc.name);
289 return PTR_ERR(regulator);
290 }
291
292 return 0;
293}
294
295static const struct of_device_id pwm_of_match[] = {
296 { .compatible = "pwm-regulator" },
297 { },
298};
299MODULE_DEVICE_TABLE(of, pwm_of_match);
300
301static struct platform_driver pwm_regulator_driver = {
302 .driver = {
303 .name = "pwm-regulator",
304 .of_match_table = of_match_ptr(pwm_of_match),
305 },
306 .probe = pwm_regulator_probe,
307};
308
309module_platform_driver(pwm_regulator_driver);
310
311MODULE_LICENSE("GPL");
312MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org>");
313MODULE_DESCRIPTION("PWM Regulator Driver");
314MODULE_ALIAS("platform:pwm-regulator");