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        = of_match_ptr(#_match),	\
135 			.regulators_node = of_match_ptr("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        = of_match_ptr(#_match),	\
174 			.regulators_node = of_match_ptr("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        = of_match_ptr(#_match),	\
214 			.regulators_node = of_match_ptr("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        = of_match_ptr(#_match),	\
251 			.regulators_node = of_match_ptr("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        = of_match_ptr(#_match),	\
288 			.regulators_node = of_match_ptr("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 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 
367 static int hi6421_regulator_enable(struct regulator_dev *rdev)
368 {
369 	struct hi6421_regulator_pdata *pdata;
370 
371 	pdata = dev_get_drvdata(rdev->dev.parent);
372 	/* hi6421 spec requires regulator enablement must be serialized:
373 	 *  - Because when BUCK, LDO switching from off to on, it will have
374 	 *    a huge instantaneous current; so you can not turn on two or
375 	 *    more LDO or BUCKs simultaneously, or it may burn the chip.
376 	 */
377 	mutex_lock(&pdata->lock);
378 
379 	/* call regulator regmap helper */
380 	regulator_enable_regmap(rdev);
381 
382 	mutex_unlock(&pdata->lock);
383 	return 0;
384 }
385 
386 static unsigned int hi6421_regulator_ldo_get_mode(struct regulator_dev *rdev)
387 {
388 	struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
389 	unsigned int reg_val;
390 
391 	regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
392 	if (reg_val & info->mode_mask)
393 		return REGULATOR_MODE_IDLE;
394 
395 	return REGULATOR_MODE_NORMAL;
396 }
397 
398 static unsigned int hi6421_regulator_buck_get_mode(struct regulator_dev *rdev)
399 {
400 	struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
401 	unsigned int reg_val;
402 
403 	regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
404 	if (reg_val & info->mode_mask)
405 		return REGULATOR_MODE_STANDBY;
406 
407 	return REGULATOR_MODE_NORMAL;
408 }
409 
410 static int hi6421_regulator_ldo_set_mode(struct regulator_dev *rdev,
411 						unsigned int mode)
412 {
413 	struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
414 	unsigned int new_mode;
415 
416 	switch (mode) {
417 	case REGULATOR_MODE_NORMAL:
418 		new_mode = 0;
419 		break;
420 	case REGULATOR_MODE_IDLE:
421 		new_mode = info->mode_mask;
422 		break;
423 	default:
424 		return -EINVAL;
425 	}
426 
427 	/* set mode */
428 	regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
429 			   info->mode_mask, new_mode);
430 
431 	return 0;
432 }
433 
434 static int hi6421_regulator_buck_set_mode(struct regulator_dev *rdev,
435 						unsigned int mode)
436 {
437 	struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
438 	unsigned int new_mode;
439 
440 	switch (mode) {
441 	case REGULATOR_MODE_NORMAL:
442 		new_mode = 0;
443 		break;
444 	case REGULATOR_MODE_STANDBY:
445 		new_mode = info->mode_mask;
446 		break;
447 	default:
448 		return -EINVAL;
449 	}
450 
451 	/* set mode */
452 	regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
453 			   info->mode_mask, new_mode);
454 
455 	return 0;
456 }
457 
458 static unsigned int
459 hi6421_regulator_ldo_get_optimum_mode(struct regulator_dev *rdev,
460 			int input_uV, int output_uV, int load_uA)
461 {
462 	struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
463 
464 	if (load_uA > info->eco_microamp)
465 		return REGULATOR_MODE_NORMAL;
466 
467 	return REGULATOR_MODE_IDLE;
468 }
469 
470 static const struct regulator_ops hi6421_ldo_ops = {
471 	.is_enabled = regulator_is_enabled_regmap,
472 	.enable = hi6421_regulator_enable,
473 	.disable = regulator_disable_regmap,
474 	.list_voltage = regulator_list_voltage_table,
475 	.map_voltage = regulator_map_voltage_ascend,
476 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
477 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
478 	.get_mode = hi6421_regulator_ldo_get_mode,
479 	.set_mode = hi6421_regulator_ldo_set_mode,
480 	.get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
481 };
482 
483 static const struct regulator_ops hi6421_ldo_linear_ops = {
484 	.is_enabled = regulator_is_enabled_regmap,
485 	.enable = hi6421_regulator_enable,
486 	.disable = regulator_disable_regmap,
487 	.list_voltage = regulator_list_voltage_linear,
488 	.map_voltage = regulator_map_voltage_linear,
489 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
490 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
491 	.get_mode = hi6421_regulator_ldo_get_mode,
492 	.set_mode = hi6421_regulator_ldo_set_mode,
493 	.get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
494 };
495 
496 static const struct regulator_ops hi6421_ldo_linear_range_ops = {
497 	.is_enabled = regulator_is_enabled_regmap,
498 	.enable = hi6421_regulator_enable,
499 	.disable = regulator_disable_regmap,
500 	.list_voltage = regulator_list_voltage_linear_range,
501 	.map_voltage = regulator_map_voltage_linear_range,
502 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
503 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
504 	.get_mode = hi6421_regulator_ldo_get_mode,
505 	.set_mode = hi6421_regulator_ldo_set_mode,
506 	.get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
507 };
508 
509 static const struct regulator_ops hi6421_buck012_ops = {
510 	.is_enabled = regulator_is_enabled_regmap,
511 	.enable = hi6421_regulator_enable,
512 	.disable = regulator_disable_regmap,
513 	.list_voltage = regulator_list_voltage_linear,
514 	.map_voltage = regulator_map_voltage_linear,
515 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
516 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
517 	.get_mode = hi6421_regulator_buck_get_mode,
518 	.set_mode = hi6421_regulator_buck_set_mode,
519 };
520 
521 static const struct regulator_ops hi6421_buck345_ops = {
522 	.is_enabled = regulator_is_enabled_regmap,
523 	.enable = hi6421_regulator_enable,
524 	.disable = regulator_disable_regmap,
525 	.list_voltage = regulator_list_voltage_table,
526 	.map_voltage = regulator_map_voltage_ascend,
527 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
528 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
529 	.get_mode = hi6421_regulator_buck_get_mode,
530 	.set_mode = hi6421_regulator_buck_set_mode,
531 };
532 
533 static int hi6421_regulator_probe(struct platform_device *pdev)
534 {
535 	struct hi6421_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
536 	struct hi6421_regulator_pdata *pdata;
537 	struct hi6421_regulator_info *info;
538 	struct regulator_config config = { };
539 	struct regulator_dev *rdev;
540 	int i;
541 
542 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
543 	if (!pdata)
544 		return -ENOMEM;
545 	mutex_init(&pdata->lock);
546 	platform_set_drvdata(pdev, pdata);
547 
548 	for (i = 0; i < ARRAY_SIZE(hi6421_regulator_info); i++) {
549 		/* assign per-regulator data */
550 		info = &hi6421_regulator_info[i];
551 
552 		config.dev = pdev->dev.parent;
553 		config.driver_data = info;
554 		config.regmap = pmic->regmap;
555 
556 		rdev = devm_regulator_register(&pdev->dev, &info->desc,
557 					       &config);
558 		if (IS_ERR(rdev)) {
559 			dev_err(&pdev->dev, "failed to register regulator %s\n",
560 				info->desc.name);
561 			return PTR_ERR(rdev);
562 		}
563 	}
564 
565 	return 0;
566 }
567 
568 static const struct platform_device_id hi6421_regulator_table[] = {
569 	{ .name = "hi6421-regulator" },
570 	{},
571 };
572 MODULE_DEVICE_TABLE(platform, hi6421_regulator_table);
573 
574 static struct platform_driver hi6421_regulator_driver = {
575 	.id_table = hi6421_regulator_table,
576 	.driver = {
577 		.name	= "hi6421-regulator",
578 	},
579 	.probe	= hi6421_regulator_probe,
580 };
581 module_platform_driver(hi6421_regulator_driver);
582 
583 MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
584 MODULE_DESCRIPTION("Hi6421 regulator driver");
585 MODULE_LICENSE("GPL v2");
586