summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/hi6421-regulator.c
blob: 156d0d1a55f1d96fd1f1c96ac83c57c78235b03a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
/*
 * Device driver for regulators in Hi6421 IC
 *
 * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
 *              http://www.hisilicon.com
 * Copyright (c) <2013-2014> Linaro Ltd.
 *              http://www.linaro.org
 *
 * Author: Guodong Xu <guodong.xu@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/hi6421-pmic.h>

/*
 * struct hi6421_regulator_pdata - Hi6421 regulator data of platform device
 * @lock: mutex to serialize regulator enable
 */
struct hi6421_regulator_pdata {
	struct mutex lock;
};

/*
 * struct hi6421_regulator_info - hi6421 regulator information
 * @desc: regulator description
 * @mode_mask: ECO mode bitmask of LDOs; for BUCKs, this masks sleep
 * @eco_microamp: eco mode load upper limit (in uA), valid for LDOs only
 */
struct hi6421_regulator_info {
	struct regulator_desc	desc;
	u8		mode_mask;
	u32		eco_microamp;
};

/* HI6421 regulators */
enum hi6421_regulator_id {
	HI6421_LDO0,
	HI6421_LDO1,
	HI6421_LDO2,
	HI6421_LDO3,
	HI6421_LDO4,
	HI6421_LDO5,
	HI6421_LDO6,
	HI6421_LDO7,
	HI6421_LDO8,
	HI6421_LDO9,
	HI6421_LDO10,
	HI6421_LDO11,
	HI6421_LDO12,
	HI6421_LDO13,
	HI6421_LDO14,
	HI6421_LDO15,
	HI6421_LDO16,
	HI6421_LDO17,
	HI6421_LDO18,
	HI6421_LDO19,
	HI6421_LDO20,
	HI6421_LDOAUDIO,
	HI6421_BUCK0,
	HI6421_BUCK1,
	HI6421_BUCK2,
	HI6421_BUCK3,
	HI6421_BUCK4,
	HI6421_BUCK5,
	HI6421_NUM_REGULATORS,
};

#define HI6421_REGULATOR_OF_MATCH(_name, id)				\
{									\
	.name = #_name,							\
	.driver_data = (void *) HI6421_##id,				\
}

static struct of_regulator_match hi6421_regulator_match[] = {
	HI6421_REGULATOR_OF_MATCH(hi6421_vout0, LDO0),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout1, LDO1),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout2, LDO2),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout3, LDO3),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout4, LDO4),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout5, LDO5),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout6, LDO6),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout7, LDO7),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout8, LDO8),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout9, LDO9),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout10, LDO10),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout11, LDO11),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout12, LDO12),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout13, LDO13),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout14, LDO14),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout15, LDO15),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout16, LDO16),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout17, LDO17),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout18, LDO18),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout19, LDO19),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout20, LDO20),
	HI6421_REGULATOR_OF_MATCH(hi6421_vout_audio, LDOAUDIO),
	HI6421_REGULATOR_OF_MATCH(hi6421_buck0, BUCK0),
	HI6421_REGULATOR_OF_MATCH(hi6421_buck1, BUCK1),
	HI6421_REGULATOR_OF_MATCH(hi6421_buck2, BUCK2),
	HI6421_REGULATOR_OF_MATCH(hi6421_buck3, BUCK3),
	HI6421_REGULATOR_OF_MATCH(hi6421_buck4, BUCK4),
	HI6421_REGULATOR_OF_MATCH(hi6421_buck5, BUCK5),
};

/* LDO 0, 4~7, 9~14, 16~20 have same voltage table. */
static const unsigned int ldo_0_voltages[] = {
	1500000, 1800000, 2400000, 2500000,
	2600000, 2700000, 2850000, 3000000,
};

/* LDO 8, 15 have same voltage table. */
static const unsigned int ldo_8_voltages[] = {
	1500000, 1800000, 2400000, 2600000,
	2700000, 2850000, 3000000, 3300000,
};

/* Ranges are sorted in ascending order. */
static const struct regulator_linear_range ldo_audio_volt_range[] = {
	REGULATOR_LINEAR_RANGE(2800000, 0, 3, 50000),
	REGULATOR_LINEAR_RANGE(3000000, 4, 7, 100000),
};

static const unsigned int buck_3_voltages[] = {
	 950000, 1050000, 1100000, 1117000,
	1134000, 1150000, 1167000, 1200000,
};

static const unsigned int buck_4_voltages[] = {
	1150000, 1200000, 1250000, 1350000,
	1700000, 1800000, 1900000, 2000000,
};

static const unsigned int buck_5_voltages[] = {
	1150000, 1200000, 1250000, 1350000,
	1600000, 1700000, 1800000, 1900000,
};

static const struct regulator_ops hi6421_ldo_ops;
static const struct regulator_ops hi6421_ldo_linear_ops;
static const struct regulator_ops hi6421_ldo_linear_range_ops;
static const struct regulator_ops hi6421_buck012_ops;
static const struct regulator_ops hi6421_buck345_ops;

#define HI6421_LDO_ENABLE_TIME (350)
/*
 * _id - LDO id name string
 * v_table - voltage table
 * vreg - voltage select register
 * vmask - voltage select mask
 * ereg - enable register
 * emask - enable mask
 * odelay - off/on delay time in uS
 * ecomask - eco mode mask
 * ecoamp - eco mode load uppler limit in uA
 */
#define HI6421_LDO(_id, v_table, vreg, vmask, ereg, emask,		\
		   odelay, ecomask, ecoamp)				\
	[HI6421_##_id] = {						\
		.desc = {						\
			.name		= #_id,				\
			.ops		= &hi6421_ldo_ops,		\
			.type		= REGULATOR_VOLTAGE,		\
			.id		= HI6421_##_id,			\
			.owner		= THIS_MODULE,			\
			.n_voltages	= ARRAY_SIZE(v_table),		\
			.volt_table	= v_table,			\
			.vsel_reg	= HI6421_REG_TO_BUS_ADDR(vreg),	\
			.vsel_mask	= vmask,			\
			.enable_reg	= HI6421_REG_TO_BUS_ADDR(ereg),	\
			.enable_mask	= emask,			\
			.enable_time	= HI6421_LDO_ENABLE_TIME,	\
			.off_on_delay	= odelay,			\
		},							\
		.mode_mask		= ecomask,			\
		.eco_microamp		= ecoamp,			\
	}

/* HI6421 LDO1~3 are linear voltage regulators at fixed uV_step
 *
 * _id - LDO id name string
 * _min_uV - minimum voltage supported in uV
 * n_volt - number of votages available
 * vstep - voltage increase in each linear step in uV
 * vreg - voltage select register
 * vmask - voltage select mask
 * ereg - enable register
 * emask - enable mask
 * odelay - off/on delay time in uS
 * ecomask - eco mode mask
 * ecoamp - eco mode load uppler limit in uA
 */
#define HI6421_LDO_LINEAR(_id, _min_uV, n_volt, vstep, vreg, vmask,	\
			  ereg, emask, odelay, ecomask, ecoamp)		\
	[HI6421_##_id] = {						\
		.desc = {						\
			.name		= #_id,				\
			.ops		= &hi6421_ldo_linear_ops,	\
			.type		= REGULATOR_VOLTAGE,		\
			.id		= HI6421_##_id,			\
			.owner		= THIS_MODULE,			\
			.min_uV		= _min_uV,			\
			.n_voltages	= n_volt,			\
			.uV_step	= vstep,			\
			.vsel_reg	= HI6421_REG_TO_BUS_ADDR(vreg),	\
			.vsel_mask	= vmask,			\
			.enable_reg	= HI6421_REG_TO_BUS_ADDR(ereg),	\
			.enable_mask	= emask,			\
			.enable_time	= HI6421_LDO_ENABLE_TIME,	\
			.off_on_delay	= odelay,			\
		},							\
		.mode_mask		= ecomask,			\
		.eco_microamp		= ecoamp,			\
	}

/* HI6421 LDOAUDIO is a linear voltage regulator with two 4-step ranges
 *
 * _id - LDO id name string
 * n_volt - number of votages available
 * volt_ranges - array of regulator_linear_range
 * vstep - voltage increase in each linear step in uV
 * vreg - voltage select register
 * vmask - voltage select mask
 * ereg - enable register
 * emask - enable mask
 * odelay - off/on delay time in uS
 * ecomask - eco mode mask
 * ecoamp - eco mode load uppler limit in uA
 */
#define HI6421_LDO_LINEAR_RANGE(_id, n_volt, volt_ranges, vreg, vmask,	\
				ereg, emask, odelay, ecomask, ecoamp)	\
	[HI6421_##_id] = {						\
		.desc = {						\
			.name		= #_id,				\
			.ops		= &hi6421_ldo_linear_range_ops,	\
			.type		= REGULATOR_VOLTAGE,		\
			.id		= HI6421_##_id,			\
			.owner		= THIS_MODULE,			\
			.n_voltages	= n_volt,			\
			.linear_ranges	= volt_ranges,			\
			.n_linear_ranges = ARRAY_SIZE(volt_ranges),	\
			.vsel_reg	= HI6421_REG_TO_BUS_ADDR(vreg),	\
			.vsel_mask	= vmask,			\
			.enable_reg	= HI6421_REG_TO_BUS_ADDR(ereg),	\
			.enable_mask	= emask,			\
			.enable_time	= HI6421_LDO_ENABLE_TIME,	\
			.off_on_delay	= odelay,			\
		},							\
		.mode_mask		= ecomask,			\
		.eco_microamp		= ecoamp,			\
	}

/* HI6421 BUCK0/1/2 are linear voltage regulators at fixed uV_step
 *
 * _id - BUCK0/1/2 id name string
 * vreg - voltage select register
 * vmask - voltage select mask
 * ereg - enable register
 * emask - enable mask
 * sleepmask - mask of sleep mode
 * etime - enable time
 * odelay - off/on delay time in uS
 */
#define HI6421_BUCK012(_id, vreg, vmask, ereg, emask, sleepmask,	\
			etime, odelay)					\
	[HI6421_##_id] = {						\
		.desc = {						\
			.name		= #_id,				\
			.ops		= &hi6421_buck012_ops,		\
			.type		= REGULATOR_VOLTAGE,		\
			.id		= HI6421_##_id,			\
			.owner		= THIS_MODULE,			\
			.min_uV		= 700000,			\
			.n_voltages	= 128,				\
			.uV_step	= 7086,				\
			.vsel_reg	= HI6421_REG_TO_BUS_ADDR(vreg),	\
			.vsel_mask	= vmask,			\
			.enable_reg	= HI6421_REG_TO_BUS_ADDR(ereg),	\
			.enable_mask	= emask,			\
			.enable_time	= etime,			\
			.off_on_delay	= odelay,			\
		},							\
		.mode_mask		= sleepmask,			\
	}

/* HI6421 BUCK3/4/5 share similar configurations as LDOs, with exception
 *  that it supports SLEEP mode, so has different .ops.
 *
 * _id - LDO id name string
 * v_table - voltage table
 * vreg - voltage select register
 * vmask - voltage select mask
 * ereg - enable register
 * emask - enable mask
 * odelay - off/on delay time in uS
 * sleepmask - mask of sleep mode
 */
#define HI6421_BUCK345(_id, v_table, vreg, vmask, ereg, emask,		\
			odelay, sleepmask)				\
	[HI6421_##_id] = {						\
		.desc = {						\
			.name		= #_id,				\
			.ops		= &hi6421_buck345_ops,		\
			.type		= REGULATOR_VOLTAGE,		\
			.id		= HI6421_##_id,			\
			.owner		= THIS_MODULE,			\
			.n_voltages	= ARRAY_SIZE(v_table),		\
			.volt_table	= v_table,			\
			.vsel_reg	= HI6421_REG_TO_BUS_ADDR(vreg),	\
			.vsel_mask	= vmask,			\
			.enable_reg	= HI6421_REG_TO_BUS_ADDR(ereg),	\
			.enable_mask	= emask,			\
			.enable_time	= HI6421_LDO_ENABLE_TIME,	\
			.off_on_delay	= odelay,			\
		},							\
		.mode_mask		= sleepmask,			\
	}

/* HI6421 regulator information */
static struct hi6421_regulator_info
		hi6421_regulator_info[HI6421_NUM_REGULATORS] = {
	HI6421_LDO(LDO0, ldo_0_voltages, 0x20, 0x07, 0x20, 0x10,
		   10000, 0x20, 8000),
	HI6421_LDO_LINEAR(LDO1, 1700000, 4, 100000, 0x21, 0x03, 0x21, 0x10,
			  10000, 0x20, 5000),
	HI6421_LDO_LINEAR(LDO2, 1050000, 8, 50000, 0x22, 0x07, 0x22, 0x10,
			  20000, 0x20, 8000),
	HI6421_LDO_LINEAR(LDO3, 1050000, 8, 50000, 0x23, 0x07, 0x23, 0x10,
			  20000, 0x20, 8000),
	HI6421_LDO(LDO4, ldo_0_voltages, 0x24, 0x07, 0x24, 0x10,
		   20000, 0x20, 8000),
	HI6421_LDO(LDO5, ldo_0_voltages, 0x25, 0x07, 0x25, 0x10,
		   20000, 0x20, 8000),
	HI6421_LDO(LDO6, ldo_0_voltages, 0x26, 0x07, 0x26, 0x10,
		   20000, 0x20, 8000),
	HI6421_LDO(LDO7, ldo_0_voltages, 0x27, 0x07, 0x27, 0x10,
		   20000, 0x20, 5000),
	HI6421_LDO(LDO8, ldo_8_voltages, 0x28, 0x07, 0x28, 0x10,
		   20000, 0x20, 8000),
	HI6421_LDO(LDO9, ldo_0_voltages, 0x29, 0x07, 0x29, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO(LDO10, ldo_0_voltages, 0x2a, 0x07, 0x2a, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO(LDO11, ldo_0_voltages, 0x2b, 0x07, 0x2b, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO(LDO12, ldo_0_voltages, 0x2c, 0x07, 0x2c, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO(LDO13, ldo_0_voltages, 0x2d, 0x07, 0x2d, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO(LDO14, ldo_0_voltages, 0x2e, 0x07, 0x2e, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO(LDO15, ldo_8_voltages, 0x2f, 0x07, 0x2f, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO(LDO16, ldo_0_voltages, 0x30, 0x07, 0x30, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO(LDO17, ldo_0_voltages, 0x31, 0x07, 0x31, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO(LDO18, ldo_0_voltages, 0x32, 0x07, 0x32, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO(LDO19, ldo_0_voltages, 0x33, 0x07, 0x33, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO(LDO20, ldo_0_voltages, 0x34, 0x07, 0x34, 0x10,
		   40000, 0x20, 8000),
	HI6421_LDO_LINEAR_RANGE(LDOAUDIO, 8, ldo_audio_volt_range, 0x36,
				0x70, 0x36, 0x01, 40000, 0x02, 5000),
	HI6421_BUCK012(BUCK0, 0x0d, 0x7f, 0x0c, 0x01, 0x10, 400, 20000),
	HI6421_BUCK012(BUCK1, 0x0f, 0x7f, 0x0e, 0x01, 0x10, 400, 20000),
	HI6421_BUCK012(BUCK2, 0x11, 0x7f, 0x10, 0x01, 0x10, 350, 100),
	HI6421_BUCK345(BUCK3, buck_3_voltages, 0x13, 0x07, 0x12, 0x01,
		       20000, 0x10),
	HI6421_BUCK345(BUCK4, buck_4_voltages, 0x15, 0x07, 0x14, 0x01,
		       20000, 0x10),
	HI6421_BUCK345(BUCK5, buck_5_voltages, 0x17, 0x07, 0x16, 0x01,
		       20000, 0x10),
};

static int hi6421_regulator_enable(struct regulator_dev *rdev)
{
	struct hi6421_regulator_pdata *pdata;

	pdata = dev_get_drvdata(rdev->dev.parent);
	/* hi6421 spec requires regulator enablement must be serialized:
	 *  - Because when BUCK, LDO switching from off to on, it will have
	 *    a huge instantaneous current; so you can not turn on two or
	 *    more LDO or BUCKs simultaneously, or it may burn the chip.
	 */
	mutex_lock(&pdata->lock);

	/* call regulator regmap helper */
	regulator_enable_regmap(rdev);

	mutex_unlock(&pdata->lock);
	return 0;
}

static unsigned int hi6421_regulator_ldo_get_mode(struct regulator_dev *rdev)
{
	struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
	u32 reg_val;

	regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
	if (reg_val & info->mode_mask)
		return REGULATOR_MODE_IDLE;

	return REGULATOR_MODE_NORMAL;
}

static unsigned int hi6421_regulator_buck_get_mode(struct regulator_dev *rdev)
{
	struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
	u32 reg_val;

	regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
	if (reg_val & info->mode_mask)
		return REGULATOR_MODE_STANDBY;

	return REGULATOR_MODE_NORMAL;
}

static int hi6421_regulator_ldo_set_mode(struct regulator_dev *rdev,
						unsigned int mode)
{
	struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
	u32 new_mode;

	switch (mode) {
	case REGULATOR_MODE_NORMAL:
		new_mode = 0;
		break;
	case REGULATOR_MODE_IDLE:
		new_mode = info->mode_mask;
		break;
	default:
		return -EINVAL;
	}

	/* set mode */
	regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
			   info->mode_mask, new_mode);

	return 0;
}

static int hi6421_regulator_buck_set_mode(struct regulator_dev *rdev,
						unsigned int mode)
{
	struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);
	u32 new_mode;

	switch (mode) {
	case REGULATOR_MODE_NORMAL:
		new_mode = 0;
		break;
	case REGULATOR_MODE_STANDBY:
		new_mode = info->mode_mask;
		break;
	default:
		return -EINVAL;
	}

	/* set mode */
	regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
			   info->mode_mask, new_mode);

	return 0;
}

unsigned int hi6421_regulator_ldo_get_optimum_mode(struct regulator_dev *rdev,
			int input_uV, int output_uV, int load_uA)
{
	struct hi6421_regulator_info *info = rdev_get_drvdata(rdev);

	if (load_uA > info->eco_microamp)
		return REGULATOR_MODE_NORMAL;

	return REGULATOR_MODE_IDLE;
}

static const struct regulator_ops hi6421_ldo_ops = {
	.is_enabled = regulator_is_enabled_regmap,
	.enable = hi6421_regulator_enable,
	.disable = regulator_disable_regmap,
	.list_voltage = regulator_list_voltage_table,
	.map_voltage = regulator_map_voltage_ascend,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_mode = hi6421_regulator_ldo_get_mode,
	.set_mode = hi6421_regulator_ldo_set_mode,
	.get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
};

static const struct regulator_ops hi6421_ldo_linear_ops = {
	.is_enabled = regulator_is_enabled_regmap,
	.enable = hi6421_regulator_enable,
	.disable = regulator_disable_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_mode = hi6421_regulator_ldo_get_mode,
	.set_mode = hi6421_regulator_ldo_set_mode,
	.get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
};

static const struct regulator_ops hi6421_ldo_linear_range_ops = {
	.is_enabled = regulator_is_enabled_regmap,
	.enable = hi6421_regulator_enable,
	.disable = regulator_disable_regmap,
	.list_voltage = regulator_list_voltage_linear_range,
	.map_voltage = regulator_map_voltage_linear_range,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_mode = hi6421_regulator_ldo_get_mode,
	.set_mode = hi6421_regulator_ldo_set_mode,
	.get_optimum_mode = hi6421_regulator_ldo_get_optimum_mode,
};

static const struct regulator_ops hi6421_buck012_ops = {
	.is_enabled = regulator_is_enabled_regmap,
	.enable = hi6421_regulator_enable,
	.disable = regulator_disable_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_mode = hi6421_regulator_buck_get_mode,
	.set_mode = hi6421_regulator_buck_set_mode,
};

static const struct regulator_ops hi6421_buck345_ops = {
	.is_enabled = regulator_is_enabled_regmap,
	.enable = hi6421_regulator_enable,
	.disable = regulator_disable_regmap,
	.list_voltage = regulator_list_voltage_table,
	.map_voltage = regulator_map_voltage_ascend,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_mode = hi6421_regulator_buck_get_mode,
	.set_mode = hi6421_regulator_buck_set_mode,
};

static int hi6421_regulator_register(struct platform_device *pdev,
				     struct regmap *rmap,
				     struct regulator_init_data *init_data,
				     int id, struct device_node *np)
{
	struct hi6421_regulator_info *info = NULL;
	struct regulator_config config = { };
	struct regulator_dev *rdev;

	/* assign per-regulator data */
	info = &hi6421_regulator_info[id];

	config.dev = &pdev->dev;
	config.init_data = init_data;
	config.driver_data = info;
	config.regmap = rmap;
	config.of_node = np;

	/* register regulator with framework */
	rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
	if (IS_ERR(rdev)) {
		dev_err(&pdev->dev, "failed to register regulator %s\n",
			info->desc.name);
		return PTR_ERR(rdev);
	}

	return 0;
}

static int hi6421_regulator_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np;
	struct hi6421_pmic *pmic;
	struct hi6421_regulator_pdata *pdata;
	int i, ret = 0;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;
	mutex_init(&pdata->lock);
	platform_set_drvdata(pdev, pdata);

	np = of_get_child_by_name(dev->parent->of_node, "regulators");
	if (!np)
		return -ENODEV;

	ret = of_regulator_match(dev, np,
				 hi6421_regulator_match,
				 ARRAY_SIZE(hi6421_regulator_match));
	of_node_put(np);
	if (ret < 0) {
		dev_err(dev, "Error parsing regulator init data: %d\n", ret);
		return ret;
	}

	pmic = dev_get_drvdata(dev->parent);

	for (i = 0; i < ARRAY_SIZE(hi6421_regulator_info); i++) {
		ret = hi6421_regulator_register(pdev, pmic->regmap,
			hi6421_regulator_match[i].init_data, i,
			hi6421_regulator_match[i].of_node);
		if (ret)
			return ret;
	}

	return 0;
}

static struct platform_driver hi6421_regulator_driver = {
	.driver = {
		.name	= "hi6421-regulator",
		.owner  = THIS_MODULE,
	},
	.probe	= hi6421_regulator_probe,
};
module_platform_driver(hi6421_regulator_driver);

MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
MODULE_DESCRIPTION("Hi6421 regulator driver");
MODULE_LICENSE("GPL v2");