1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Device driver for regulators in Hi6421 IC
4 //
5 // Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
6 // http://www.hisilicon.com
7 // Copyright (c) <2013-2014> Linaro Ltd.
8 // https://www.linaro.org
9 //
10 // Author: Guodong Xu <guodong.xu@linaro.org>
11
12 #include <linux/slab.h>
13 #include <linux/device.h>
14 #include <linux/module.h>
15 #include <linux/err.h>
16 #include <linux/platform_device.h>
17 #include <linux/of.h>
18 #include <linux/regmap.h>
19 #include <linux/regulator/driver.h>
20 #include <linux/regulator/machine.h>
21 #include <linux/regulator/of_regulator.h>
22 #include <linux/mfd/hi6421-pmic.h>
23
24 /*
25 * struct hi6421_regulator_pdata - Hi6421 regulator data of platform device
26 * @lock: mutex to serialize regulator enable
27 */
28 struct hi6421_regulator_pdata {
29 struct mutex lock;
30 };
31
32 /*
33 * struct hi6421_regulator_info - hi6421 regulator information
34 * @desc: regulator description
35 * @mode_mask: ECO mode bitmask of LDOs; for BUCKs, this masks sleep
36 * @eco_microamp: eco mode load upper limit (in uA), valid for LDOs only
37 */
38 struct hi6421_regulator_info {
39 struct regulator_desc desc;
40 u8 mode_mask;
41 u32 eco_microamp;
42 };
43
44 /* HI6421 regulators */
45 enum hi6421_regulator_id {
46 HI6421_LDO0,
47 HI6421_LDO1,
48 HI6421_LDO2,
49 HI6421_LDO3,
50 HI6421_LDO4,
51 HI6421_LDO5,
52 HI6421_LDO6,
53 HI6421_LDO7,
54 HI6421_LDO8,
55 HI6421_LDO9,
56 HI6421_LDO10,
57 HI6421_LDO11,
58 HI6421_LDO12,
59 HI6421_LDO13,
60 HI6421_LDO14,
61 HI6421_LDO15,
62 HI6421_LDO16,
63 HI6421_LDO17,
64 HI6421_LDO18,
65 HI6421_LDO19,
66 HI6421_LDO20,
67 HI6421_LDOAUDIO,
68 HI6421_BUCK0,
69 HI6421_BUCK1,
70 HI6421_BUCK2,
71 HI6421_BUCK3,
72 HI6421_BUCK4,
73 HI6421_BUCK5,
74 HI6421_NUM_REGULATORS,
75 };
76
77 /* LDO 0, 4~7, 9~14, 16~20 have same voltage table. */
78 static const unsigned int ldo_0_voltages[] = {
79 1500000, 1800000, 2400000, 2500000,
80 2600000, 2700000, 2850000, 3000000,
81 };
82
83 /* LDO 8, 15 have same voltage table. */
84 static const unsigned int ldo_8_voltages[] = {
85 1500000, 1800000, 2400000, 2600000,
86 2700000, 2850000, 3000000, 3300000,
87 };
88
89 /* Ranges are sorted in ascending order. */
90 static const struct linear_range ldo_audio_volt_range[] = {
91 REGULATOR_LINEAR_RANGE(2800000, 0, 3, 50000),
92 REGULATOR_LINEAR_RANGE(3000000, 4, 7, 100000),
93 };
94
95 static const unsigned int buck_3_voltages[] = {
96 950000, 1050000, 1100000, 1117000,
97 1134000, 1150000, 1167000, 1200000,
98 };
99
100 static const unsigned int buck_4_voltages[] = {
101 1150000, 1200000, 1250000, 1350000,
102 1700000, 1800000, 1900000, 2000000,
103 };
104
105 static const unsigned int buck_5_voltages[] = {
106 1150000, 1200000, 1250000, 1350000,
107 1600000, 1700000, 1800000, 1900000,
108 };
109
110 static const struct regulator_ops hi6421_ldo_ops;
111 static const struct regulator_ops hi6421_ldo_linear_ops;
112 static const struct regulator_ops hi6421_ldo_linear_range_ops;
113 static const struct regulator_ops hi6421_buck012_ops;
114 static const struct regulator_ops hi6421_buck345_ops;
115
116 #define HI6421_LDO_ENABLE_TIME (350)
117 /*
118 * _id - LDO id name string
119 * _match - of match name string
120 * v_table - voltage table
121 * vreg - voltage select register
122 * vmask - voltage select mask
123 * ereg - enable register
124 * emask - enable mask
125 * odelay - off/on delay time in uS
126 * ecomask - eco mode mask
127 * ecoamp - eco mode load uppler limit in uA
128 */
129 #define HI6421_LDO(_id, _match, v_table, vreg, vmask, ereg, emask, \
130 odelay, ecomask, ecoamp) \
131 [HI6421_##_id] = { \
132 .desc = { \
133 .name = #_id, \
134 .of_match = #_match, \
135 .regulators_node = "regulators", \
136 .ops = &hi6421_ldo_ops, \
137 .type = REGULATOR_VOLTAGE, \
138 .id = HI6421_##_id, \
139 .owner = THIS_MODULE, \
140 .n_voltages = ARRAY_SIZE(v_table), \
141 .volt_table = v_table, \
142 .vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
143 .vsel_mask = vmask, \
144 .enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
145 .enable_mask = emask, \
146 .enable_time = HI6421_LDO_ENABLE_TIME, \
147 .off_on_delay = odelay, \
148 }, \
149 .mode_mask = ecomask, \
150 .eco_microamp = ecoamp, \
151 }
152
153 /* HI6421 LDO1~3 are linear voltage regulators at fixed uV_step
154 *
155 * _id - LDO id name string
156 * _match - of match name string
157 * _min_uV - minimum voltage supported in uV
158 * n_volt - number of votages available
159 * vstep - voltage increase in each linear step in uV
160 * vreg - voltage select register
161 * vmask - voltage select mask
162 * ereg - enable register
163 * emask - enable mask
164 * odelay - off/on delay time in uS
165 * ecomask - eco mode mask
166 * ecoamp - eco mode load uppler limit in uA
167 */
168 #define HI6421_LDO_LINEAR(_id, _match, _min_uV, n_volt, vstep, vreg, vmask,\
169 ereg, emask, odelay, ecomask, ecoamp) \
170 [HI6421_##_id] = { \
171 .desc = { \
172 .name = #_id, \
173 .of_match = #_match, \
174 .regulators_node = "regulators", \
175 .ops = &hi6421_ldo_linear_ops, \
176 .type = REGULATOR_VOLTAGE, \
177 .id = HI6421_##_id, \
178 .owner = THIS_MODULE, \
179 .min_uV = _min_uV, \
180 .n_voltages = n_volt, \
181 .uV_step = vstep, \
182 .vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
183 .vsel_mask = vmask, \
184 .enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
185 .enable_mask = emask, \
186 .enable_time = HI6421_LDO_ENABLE_TIME, \
187 .off_on_delay = odelay, \
188 }, \
189 .mode_mask = ecomask, \
190 .eco_microamp = ecoamp, \
191 }
192
193 /* HI6421 LDOAUDIO is a linear voltage regulator with two 4-step ranges
194 *
195 * _id - LDO id name string
196 * _match - of match name string
197 * n_volt - number of votages available
198 * volt_ranges - array of linear_range
199 * vstep - voltage increase in each linear step in uV
200 * vreg - voltage select register
201 * vmask - voltage select mask
202 * ereg - enable register
203 * emask - enable mask
204 * odelay - off/on delay time in uS
205 * ecomask - eco mode mask
206 * ecoamp - eco mode load uppler limit in uA
207 */
208 #define HI6421_LDO_LINEAR_RANGE(_id, _match, n_volt, volt_ranges, vreg, vmask,\
209 ereg, emask, odelay, ecomask, ecoamp) \
210 [HI6421_##_id] = { \
211 .desc = { \
212 .name = #_id, \
213 .of_match = #_match, \
214 .regulators_node = "regulators", \
215 .ops = &hi6421_ldo_linear_range_ops, \
216 .type = REGULATOR_VOLTAGE, \
217 .id = HI6421_##_id, \
218 .owner = THIS_MODULE, \
219 .n_voltages = n_volt, \
220 .linear_ranges = volt_ranges, \
221 .n_linear_ranges = ARRAY_SIZE(volt_ranges), \
222 .vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
223 .vsel_mask = vmask, \
224 .enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
225 .enable_mask = emask, \
226 .enable_time = HI6421_LDO_ENABLE_TIME, \
227 .off_on_delay = odelay, \
228 }, \
229 .mode_mask = ecomask, \
230 .eco_microamp = ecoamp, \
231 }
232
233 /* HI6421 BUCK0/1/2 are linear voltage regulators at fixed uV_step
234 *
235 * _id - BUCK0/1/2 id name string
236 * _match - of match name string
237 * vreg - voltage select register
238 * vmask - voltage select mask
239 * ereg - enable register
240 * emask - enable mask
241 * sleepmask - mask of sleep mode
242 * etime - enable time
243 * odelay - off/on delay time in uS
244 */
245 #define HI6421_BUCK012(_id, _match, vreg, vmask, ereg, emask, sleepmask,\
246 etime, odelay) \
247 [HI6421_##_id] = { \
248 .desc = { \
249 .name = #_id, \
250 .of_match = #_match, \
251 .regulators_node = "regulators", \
252 .ops = &hi6421_buck012_ops, \
253 .type = REGULATOR_VOLTAGE, \
254 .id = HI6421_##_id, \
255 .owner = THIS_MODULE, \
256 .min_uV = 700000, \
257 .n_voltages = 128, \
258 .uV_step = 7086, \
259 .vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
260 .vsel_mask = vmask, \
261 .enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
262 .enable_mask = emask, \
263 .enable_time = etime, \
264 .off_on_delay = odelay, \
265 }, \
266 .mode_mask = sleepmask, \
267 }
268
269 /* HI6421 BUCK3/4/5 share similar configurations as LDOs, with exception
270 * that it supports SLEEP mode, so has different .ops.
271 *
272 * _id - LDO id name string
273 * _match - of match name string
274 * v_table - voltage table
275 * vreg - voltage select register
276 * vmask - voltage select mask
277 * ereg - enable register
278 * emask - enable mask
279 * odelay - off/on delay time in uS
280 * sleepmask - mask of sleep mode
281 */
282 #define HI6421_BUCK345(_id, _match, v_table, vreg, vmask, ereg, emask, \
283 odelay, sleepmask) \
284 [HI6421_##_id] = { \
285 .desc = { \
286 .name = #_id, \
287 .of_match = #_match, \
288 .regulators_node = "regulators", \
289 .ops = &hi6421_buck345_ops, \
290 .type = REGULATOR_VOLTAGE, \
291 .id = HI6421_##_id, \
292 .owner = THIS_MODULE, \
293 .n_voltages = ARRAY_SIZE(v_table), \
294 .volt_table = v_table, \
295 .vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
296 .vsel_mask = vmask, \
297 .enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
298 .enable_mask = emask, \
299 .enable_time = HI6421_LDO_ENABLE_TIME, \
300 .off_on_delay = odelay, \
301 }, \
302 .mode_mask = sleepmask, \
303 }
304
305 /* HI6421 regulator information */
306 static const struct hi6421_regulator_info
307 hi6421_regulator_info[HI6421_NUM_REGULATORS] = {
308 HI6421_LDO(LDO0, hi6421_vout0, ldo_0_voltages, 0x20, 0x07, 0x20, 0x10,
309 10000, 0x20, 8000),
310 HI6421_LDO_LINEAR(LDO1, hi6421_vout1, 1700000, 4, 100000, 0x21, 0x03,
311 0x21, 0x10, 10000, 0x20, 5000),
312 HI6421_LDO_LINEAR(LDO2, hi6421_vout2, 1050000, 8, 50000, 0x22, 0x07,
313 0x22, 0x10, 20000, 0x20, 8000),
314 HI6421_LDO_LINEAR(LDO3, hi6421_vout3, 1050000, 8, 50000, 0x23, 0x07,
315 0x23, 0x10, 20000, 0x20, 8000),
316 HI6421_LDO(LDO4, hi6421_vout4, ldo_0_voltages, 0x24, 0x07, 0x24, 0x10,
317 20000, 0x20, 8000),
318 HI6421_LDO(LDO5, hi6421_vout5, ldo_0_voltages, 0x25, 0x07, 0x25, 0x10,
319 20000, 0x20, 8000),
320 HI6421_LDO(LDO6, hi6421_vout6, ldo_0_voltages, 0x26, 0x07, 0x26, 0x10,
321 20000, 0x20, 8000),
322 HI6421_LDO(LDO7, hi6421_vout7, ldo_0_voltages, 0x27, 0x07, 0x27, 0x10,
323 20000, 0x20, 5000),
324 HI6421_LDO(LDO8, hi6421_vout8, ldo_8_voltages, 0x28, 0x07, 0x28, 0x10,
325 20000, 0x20, 8000),
326 HI6421_LDO(LDO9, hi6421_vout9, ldo_0_voltages, 0x29, 0x07, 0x29, 0x10,
327 40000, 0x20, 8000),
328 HI6421_LDO(LDO10, hi6421_vout10, ldo_0_voltages, 0x2a, 0x07, 0x2a, 0x10,
329 40000, 0x20, 8000),
330 HI6421_LDO(LDO11, hi6421_vout11, ldo_0_voltages, 0x2b, 0x07, 0x2b, 0x10,
331 40000, 0x20, 8000),
332 HI6421_LDO(LDO12, hi6421_vout12, ldo_0_voltages, 0x2c, 0x07, 0x2c, 0x10,
333 40000, 0x20, 8000),
334 HI6421_LDO(LDO13, hi6421_vout13, ldo_0_voltages, 0x2d, 0x07, 0x2d, 0x10,
335 40000, 0x20, 8000),
336 HI6421_LDO(LDO14, hi6421_vout14, ldo_0_voltages, 0x2e, 0x07, 0x2e, 0x10,
337 40000, 0x20, 8000),
338 HI6421_LDO(LDO15, hi6421_vout15, ldo_8_voltages, 0x2f, 0x07, 0x2f, 0x10,
339 40000, 0x20, 8000),
340 HI6421_LDO(LDO16, hi6421_vout16, ldo_0_voltages, 0x30, 0x07, 0x30, 0x10,
341 40000, 0x20, 8000),
342 HI6421_LDO(LDO17, hi6421_vout17, ldo_0_voltages, 0x31, 0x07, 0x31, 0x10,
343 40000, 0x20, 8000),
344 HI6421_LDO(LDO18, hi6421_vout18, ldo_0_voltages, 0x32, 0x07, 0x32, 0x10,
345 40000, 0x20, 8000),
346 HI6421_LDO(LDO19, hi6421_vout19, ldo_0_voltages, 0x33, 0x07, 0x33, 0x10,
347 40000, 0x20, 8000),
348 HI6421_LDO(LDO20, hi6421_vout20, ldo_0_voltages, 0x34, 0x07, 0x34, 0x10,
349 40000, 0x20, 8000),
350 HI6421_LDO_LINEAR_RANGE(LDOAUDIO, hi6421_vout_audio, 8,
351 ldo_audio_volt_range, 0x36, 0x70, 0x36, 0x01,
352 40000, 0x02, 5000),
353 HI6421_BUCK012(BUCK0, hi6421_buck0, 0x0d, 0x7f, 0x0c, 0x01, 0x10, 400,
354 20000),
355 HI6421_BUCK012(BUCK1, hi6421_buck1, 0x0f, 0x7f, 0x0e, 0x01, 0x10, 400,
356 20000),
357 HI6421_BUCK012(BUCK2, hi6421_buck2, 0x11, 0x7f, 0x10, 0x01, 0x10, 350,
358 100),
359 HI6421_BUCK345(BUCK3, hi6421_buck3, buck_3_voltages, 0x13, 0x07, 0x12,
360 0x01, 20000, 0x10),
361 HI6421_BUCK345(BUCK4, hi6421_buck4, buck_4_voltages, 0x15, 0x07, 0x14,
362 0x01, 20000, 0x10),
363 HI6421_BUCK345(BUCK5, hi6421_buck5, buck_5_voltages, 0x17, 0x07, 0x16,
364 0x01, 20000, 0x10),
365 };
366
hi6421_regulator_enable(struct regulator_dev * rdev)367 static int hi6421_regulator_enable(struct regulator_dev *rdev)
368 {
369 struct hi6421_regulator_pdata *pdata = rdev_get_drvdata(rdev);
370
371 /* hi6421 spec requires regulator enablement must be serialized:
372 * - Because when BUCK, LDO switching from off to on, it will have
373 * a huge instantaneous current; so you can not turn on two or
374 * more LDO or BUCKs simultaneously, or it may burn the chip.
375 */
376 mutex_lock(&pdata->lock);
377
378 /* call regulator regmap helper */
379 regulator_enable_regmap(rdev);
380
381 mutex_unlock(&pdata->lock);
382 return 0;
383 }
384
hi6421_regulator_ldo_get_mode(struct regulator_dev * rdev)385 static unsigned int hi6421_regulator_ldo_get_mode(struct regulator_dev *rdev)
386 {
387 const struct hi6421_regulator_info *info;
388 unsigned int reg_val;
389
390 info = container_of(rdev->desc, struct hi6421_regulator_info, desc);
391 regmap_read(rdev->regmap, rdev->desc->enable_reg, ®_val);
392 if (reg_val & info->mode_mask)
393 return REGULATOR_MODE_IDLE;
394
395 return REGULATOR_MODE_NORMAL;
396 }
397
hi6421_regulator_buck_get_mode(struct regulator_dev * rdev)398 static unsigned int hi6421_regulator_buck_get_mode(struct regulator_dev *rdev)
399 {
400 const struct hi6421_regulator_info *info;
401 unsigned int reg_val;
402
403 info = container_of(rdev->desc, struct hi6421_regulator_info, desc);
404 regmap_read(rdev->regmap, rdev->desc->enable_reg, ®_val);
405 if (reg_val & info->mode_mask)
406 return REGULATOR_MODE_STANDBY;
407
408 return REGULATOR_MODE_NORMAL;
409 }
410
hi6421_regulator_ldo_set_mode(struct regulator_dev * rdev,unsigned int mode)411 static int hi6421_regulator_ldo_set_mode(struct regulator_dev *rdev,
412 unsigned int mode)
413 {
414 const struct hi6421_regulator_info *info;
415 unsigned int new_mode;
416
417 info = container_of(rdev->desc, struct hi6421_regulator_info, desc);
418 switch (mode) {
419 case REGULATOR_MODE_NORMAL:
420 new_mode = 0;
421 break;
422 case REGULATOR_MODE_IDLE:
423 new_mode = info->mode_mask;
424 break;
425 default:
426 return -EINVAL;
427 }
428
429 /* set mode */
430 regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
431 info->mode_mask, new_mode);
432
433 return 0;
434 }
435
hi6421_regulator_buck_set_mode(struct regulator_dev * rdev,unsigned int mode)436 static int hi6421_regulator_buck_set_mode(struct regulator_dev *rdev,
437 unsigned int mode)
438 {
439 const struct hi6421_regulator_info *info;
440 unsigned int new_mode;
441
442 info = container_of(rdev->desc, struct hi6421_regulator_info, desc);
443 switch (mode) {
444 case REGULATOR_MODE_NORMAL:
445 new_mode = 0;
446 break;
447 case REGULATOR_MODE_STANDBY:
448 new_mode = info->mode_mask;
449 break;
450 default:
451 return -EINVAL;
452 }
453
454 /* set mode */
455 regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
456 info->mode_mask, new_mode);
457
458 return 0;
459 }
460
461 static unsigned int
hi6421_regulator_ldo_get_optimum_mode(struct regulator_dev * rdev,int input_uV,int output_uV,int load_uA)462 hi6421_regulator_ldo_get_optimum_mode(struct regulator_dev *rdev,
463 int input_uV, int output_uV, int load_uA)
464 {
465 const struct hi6421_regulator_info *info;
466
467 info = container_of(rdev->desc, struct hi6421_regulator_info, desc);
468
469 if (load_uA > info->eco_microamp)
470 return REGULATOR_MODE_NORMAL;
471
472 return REGULATOR_MODE_IDLE;
473 }
474
475 static const struct regulator_ops hi6421_ldo_ops = {
476 .is_enabled = regulator_is_enabled_regmap,
477 .enable = hi6421_regulator_enable,
478 .disable = regulator_disable_regmap,
479 .list_voltage = regulator_list_voltage_table,
480 .map_voltage = regulator_map_voltage_ascend,
481 .get_voltage_sel = regulator_get_voltage_sel_regmap,
482 .set_voltage_sel = regulator_set_voltage_sel_regmap,
483 .get_mode = hi6421_regulator_ldo_get_mode,
484 .set_mode = hi6421_regulator_ldo_set_mode,
485 .get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
486 };
487
488 static const struct regulator_ops hi6421_ldo_linear_ops = {
489 .is_enabled = regulator_is_enabled_regmap,
490 .enable = hi6421_regulator_enable,
491 .disable = regulator_disable_regmap,
492 .list_voltage = regulator_list_voltage_linear,
493 .map_voltage = regulator_map_voltage_linear,
494 .get_voltage_sel = regulator_get_voltage_sel_regmap,
495 .set_voltage_sel = regulator_set_voltage_sel_regmap,
496 .get_mode = hi6421_regulator_ldo_get_mode,
497 .set_mode = hi6421_regulator_ldo_set_mode,
498 .get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
499 };
500
501 static const struct regulator_ops hi6421_ldo_linear_range_ops = {
502 .is_enabled = regulator_is_enabled_regmap,
503 .enable = hi6421_regulator_enable,
504 .disable = regulator_disable_regmap,
505 .list_voltage = regulator_list_voltage_linear_range,
506 .map_voltage = regulator_map_voltage_linear_range,
507 .get_voltage_sel = regulator_get_voltage_sel_regmap,
508 .set_voltage_sel = regulator_set_voltage_sel_regmap,
509 .get_mode = hi6421_regulator_ldo_get_mode,
510 .set_mode = hi6421_regulator_ldo_set_mode,
511 .get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
512 };
513
514 static const struct regulator_ops hi6421_buck012_ops = {
515 .is_enabled = regulator_is_enabled_regmap,
516 .enable = hi6421_regulator_enable,
517 .disable = regulator_disable_regmap,
518 .list_voltage = regulator_list_voltage_linear,
519 .map_voltage = regulator_map_voltage_linear,
520 .get_voltage_sel = regulator_get_voltage_sel_regmap,
521 .set_voltage_sel = regulator_set_voltage_sel_regmap,
522 .get_mode = hi6421_regulator_buck_get_mode,
523 .set_mode = hi6421_regulator_buck_set_mode,
524 };
525
526 static const struct regulator_ops hi6421_buck345_ops = {
527 .is_enabled = regulator_is_enabled_regmap,
528 .enable = hi6421_regulator_enable,
529 .disable = regulator_disable_regmap,
530 .list_voltage = regulator_list_voltage_table,
531 .map_voltage = regulator_map_voltage_ascend,
532 .get_voltage_sel = regulator_get_voltage_sel_regmap,
533 .set_voltage_sel = regulator_set_voltage_sel_regmap,
534 .get_mode = hi6421_regulator_buck_get_mode,
535 .set_mode = hi6421_regulator_buck_set_mode,
536 };
537
hi6421_regulator_probe(struct platform_device * pdev)538 static int hi6421_regulator_probe(struct platform_device *pdev)
539 {
540 struct hi6421_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
541 struct hi6421_regulator_pdata *pdata;
542 const struct hi6421_regulator_info *info;
543 struct regulator_config config = { };
544 struct regulator_dev *rdev;
545 int i;
546
547 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
548 if (!pdata)
549 return -ENOMEM;
550 mutex_init(&pdata->lock);
551
552 for (i = 0; i < ARRAY_SIZE(hi6421_regulator_info); i++) {
553 /* assign per-regulator data */
554 info = &hi6421_regulator_info[i];
555
556 config.dev = pdev->dev.parent;
557 config.driver_data = pdata;
558 config.regmap = pmic->regmap;
559
560 rdev = devm_regulator_register(&pdev->dev, &info->desc,
561 &config);
562 if (IS_ERR(rdev)) {
563 dev_err(&pdev->dev, "failed to register regulator %s\n",
564 info->desc.name);
565 return PTR_ERR(rdev);
566 }
567 }
568
569 return 0;
570 }
571
572 static const struct platform_device_id hi6421_regulator_table[] = {
573 { .name = "hi6421-regulator" },
574 {},
575 };
576 MODULE_DEVICE_TABLE(platform, hi6421_regulator_table);
577
578 static struct platform_driver hi6421_regulator_driver = {
579 .id_table = hi6421_regulator_table,
580 .driver = {
581 .name = "hi6421-regulator",
582 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
583 },
584 .probe = hi6421_regulator_probe,
585 };
586 module_platform_driver(hi6421_regulator_driver);
587
588 MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
589 MODULE_DESCRIPTION("Hi6421 regulator driver");
590 MODULE_LICENSE("GPL v2");
591