summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/palmas-regulator.c
blob: cbaf22627bd35dbaeaa60bbb1e093cd380b2d63c (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
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
/*
 * Driver for Regulator part of Palmas PMIC Chips
 *
 * Copyright 2011-2012 Texas Instruments Inc.
 *
 * Author: Graeme Gregory <gg@slimlogic.co.uk>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under  the terms of the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the License, or (at your
 *  option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/mfd/palmas.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/regulator/of_regulator.h>

struct regs_info {
	char	*name;
	u8	vsel_addr;
	u8	ctrl_addr;
	u8	tstep_addr;
};

static const struct regs_info palmas_regs_info[] = {
	{
		.name		= "SMPS12",
		.vsel_addr	= PALMAS_SMPS12_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS12_CTRL,
		.tstep_addr	= PALMAS_SMPS12_TSTEP,
	},
	{
		.name		= "SMPS123",
		.vsel_addr	= PALMAS_SMPS12_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS12_CTRL,
		.tstep_addr	= PALMAS_SMPS12_TSTEP,
	},
	{
		.name		= "SMPS3",
		.vsel_addr	= PALMAS_SMPS3_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS3_CTRL,
	},
	{
		.name		= "SMPS45",
		.vsel_addr	= PALMAS_SMPS45_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS45_CTRL,
		.tstep_addr	= PALMAS_SMPS45_TSTEP,
	},
	{
		.name		= "SMPS457",
		.vsel_addr	= PALMAS_SMPS45_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS45_CTRL,
		.tstep_addr	= PALMAS_SMPS45_TSTEP,
	},
	{
		.name		= "SMPS6",
		.vsel_addr	= PALMAS_SMPS6_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS6_CTRL,
		.tstep_addr	= PALMAS_SMPS6_TSTEP,
	},
	{
		.name		= "SMPS7",
		.vsel_addr	= PALMAS_SMPS7_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS7_CTRL,
	},
	{
		.name		= "SMPS8",
		.vsel_addr	= PALMAS_SMPS8_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS8_CTRL,
		.tstep_addr	= PALMAS_SMPS8_TSTEP,
	},
	{
		.name		= "SMPS9",
		.vsel_addr	= PALMAS_SMPS9_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS9_CTRL,
	},
	{
		.name		= "SMPS10",
	},
	{
		.name		= "LDO1",
		.vsel_addr	= PALMAS_LDO1_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO1_CTRL,
	},
	{
		.name		= "LDO2",
		.vsel_addr	= PALMAS_LDO2_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO2_CTRL,
	},
	{
		.name		= "LDO3",
		.vsel_addr	= PALMAS_LDO3_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO3_CTRL,
	},
	{
		.name		= "LDO4",
		.vsel_addr	= PALMAS_LDO4_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO4_CTRL,
	},
	{
		.name		= "LDO5",
		.vsel_addr	= PALMAS_LDO5_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO5_CTRL,
	},
	{
		.name		= "LDO6",
		.vsel_addr	= PALMAS_LDO6_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO6_CTRL,
	},
	{
		.name		= "LDO7",
		.vsel_addr	= PALMAS_LDO7_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO7_CTRL,
	},
	{
		.name		= "LDO8",
		.vsel_addr	= PALMAS_LDO8_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO8_CTRL,
	},
	{
		.name		= "LDO9",
		.vsel_addr	= PALMAS_LDO9_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO9_CTRL,
	},
	{
		.name		= "LDOLN",
		.vsel_addr	= PALMAS_LDOLN_VOLTAGE,
		.ctrl_addr	= PALMAS_LDOLN_CTRL,
	},
	{
		.name		= "LDOUSB",
		.vsel_addr	= PALMAS_LDOUSB_VOLTAGE,
		.ctrl_addr	= PALMAS_LDOUSB_CTRL,
	},
};

#define SMPS_CTRL_MODE_OFF		0x00
#define SMPS_CTRL_MODE_ON		0x01
#define SMPS_CTRL_MODE_ECO		0x02
#define SMPS_CTRL_MODE_PWM		0x03

/* These values are derived from the data sheet. And are the number of steps
 * where there is a voltage change, the ranges at beginning and end of register
 * max/min values where there are no change are ommitted.
 *
 * So they are basically (maxV-minV)/stepV
 */
#define PALMAS_SMPS_NUM_VOLTAGES	116
#define PALMAS_SMPS10_NUM_VOLTAGES	2
#define PALMAS_LDO_NUM_VOLTAGES		50

#define SMPS10_VSEL			(1<<3)
#define SMPS10_BOOST_EN			(1<<2)
#define SMPS10_BYPASS_EN		(1<<1)
#define SMPS10_SWITCH_EN		(1<<0)

#define REGULATOR_SLAVE			0

static int palmas_smps_read(struct palmas *palmas, unsigned int reg,
		unsigned int *dest)
{
	unsigned int addr;

	addr = PALMAS_BASE_TO_REG(PALMAS_SMPS_BASE, reg);

	return regmap_read(palmas->regmap[REGULATOR_SLAVE], addr, dest);
}

static int palmas_smps_write(struct palmas *palmas, unsigned int reg,
		unsigned int value)
{
	unsigned int addr;

	addr = PALMAS_BASE_TO_REG(PALMAS_SMPS_BASE, reg);

	return regmap_write(palmas->regmap[REGULATOR_SLAVE], addr, value);
}

static int palmas_ldo_read(struct palmas *palmas, unsigned int reg,
		unsigned int *dest)
{
	unsigned int addr;

	addr = PALMAS_BASE_TO_REG(PALMAS_LDO_BASE, reg);

	return regmap_read(palmas->regmap[REGULATOR_SLAVE], addr, dest);
}

static int palmas_ldo_write(struct palmas *palmas, unsigned int reg,
		unsigned int value)
{
	unsigned int addr;

	addr = PALMAS_BASE_TO_REG(PALMAS_LDO_BASE, reg);

	return regmap_write(palmas->regmap[REGULATOR_SLAVE], addr, value);
}

static int palmas_is_enabled_smps(struct regulator_dev *dev)
{
	struct palmas_pmic *pmic = rdev_get_drvdata(dev);
	int id = rdev_get_id(dev);
	unsigned int reg;

	palmas_smps_read(pmic->palmas, palmas_regs_info[id].ctrl_addr, &reg);

	reg &= PALMAS_SMPS12_CTRL_STATUS_MASK;
	reg >>= PALMAS_SMPS12_CTRL_STATUS_SHIFT;

	return !!(reg);
}

static int palmas_enable_smps(struct regulator_dev *dev)
{
	struct palmas_pmic *pmic = rdev_get_drvdata(dev);
	int id = rdev_get_id(dev);
	unsigned int reg;

	palmas_smps_read(pmic->palmas, palmas_regs_info[id].ctrl_addr, &reg);

	reg &= ~PALMAS_SMPS12_CTRL_MODE_ACTIVE_MASK;
	reg |= SMPS_CTRL_MODE_ON;

	palmas_smps_write(pmic->palmas, palmas_regs_info[id].ctrl_addr, reg);

	return 0;
}

static int palmas_disable_smps(struct regulator_dev *dev)
{
	struct palmas_pmic *pmic = rdev_get_drvdata(dev);
	int id = rdev_get_id(dev);
	unsigned int reg;

	palmas_smps_read(pmic->palmas, palmas_regs_info[id].ctrl_addr, &reg);

	reg &= ~PALMAS_SMPS12_CTRL_MODE_ACTIVE_MASK;

	palmas_smps_write(pmic->palmas, palmas_regs_info[id].ctrl_addr, reg);

	return 0;
}


static int palmas_set_mode_smps(struct regulator_dev *dev, unsigned int mode)
{
	struct palmas_pmic *pmic = rdev_get_drvdata(dev);
	int id = rdev_get_id(dev);
	unsigned int reg;

	palmas_smps_read(pmic->palmas, palmas_regs_info[id].ctrl_addr, &reg);
	reg &= ~PALMAS_SMPS12_CTRL_MODE_ACTIVE_MASK;

	switch (mode) {
	case REGULATOR_MODE_NORMAL:
		reg |= SMPS_CTRL_MODE_ON;
		break;
	case REGULATOR_MODE_IDLE:
		reg |= SMPS_CTRL_MODE_ECO;
		break;
	case REGULATOR_MODE_FAST:
		reg |= SMPS_CTRL_MODE_PWM;
		break;
	default:
		return -EINVAL;
	}
	palmas_smps_write(pmic->palmas, palmas_regs_info[id].ctrl_addr, reg);

	return 0;
}

static unsigned int palmas_get_mode_smps(struct regulator_dev *dev)
{
	struct palmas_pmic *pmic = rdev_get_drvdata(dev);
	int id = rdev_get_id(dev);
	unsigned int reg;

	palmas_smps_read(pmic->palmas, palmas_regs_info[id].ctrl_addr, &reg);
	reg &= PALMAS_SMPS12_CTRL_STATUS_MASK;
	reg >>= PALMAS_SMPS12_CTRL_STATUS_SHIFT;

	switch (reg) {
	case SMPS_CTRL_MODE_ON:
		return REGULATOR_MODE_NORMAL;
	case SMPS_CTRL_MODE_ECO:
		return REGULATOR_MODE_IDLE;
	case SMPS_CTRL_MODE_PWM:
		return REGULATOR_MODE_FAST;
	}

	return 0;
}

static int palmas_list_voltage_smps(struct regulator_dev *dev,
					unsigned selector)
{
	struct palmas_pmic *pmic = rdev_get_drvdata(dev);
	int id = rdev_get_id(dev);
	int mult = 1;

	/* Read the multiplier set in VSEL register to return
	 * the correct voltage.
	 */
	if (pmic->range[id])
		mult = 2;

	if (selector == 0)
		return 0;
	else if (selector < 6)
		return 500000 * mult;
	else
		/* Voltage is linear mapping starting from selector 6,
		 * volt = (0.49V + ((selector - 5) * 0.01V)) * RANGE
		 * RANGE is either x1 or x2
		 */
		return (490000 + ((selector - 5) * 10000)) * mult;
}

static int palmas_map_voltage_smps(struct regulator_dev *rdev,
		int min_uV, int max_uV)
{
	struct palmas_pmic *pmic = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	int ret, voltage;

	if (min_uV == 0)
		return 0;

	if (pmic->range[id]) { /* RANGE is x2 */
		if (min_uV < 1000000)
			min_uV = 1000000;
		ret = DIV_ROUND_UP(min_uV - 1000000, 20000) + 6;
	} else {		/* RANGE is x1 */
		if (min_uV < 500000)
			min_uV = 500000;
		ret = DIV_ROUND_UP(min_uV - 500000, 10000) + 6;
	}

	/* Map back into a voltage to verify we're still in bounds */
	voltage = palmas_list_voltage_smps(rdev, ret);
	if (voltage < min_uV || voltage > max_uV)
		return -EINVAL;

	return ret;
}

static struct regulator_ops palmas_ops_smps = {
	.is_enabled		= palmas_is_enabled_smps,
	.enable			= palmas_enable_smps,
	.disable		= palmas_disable_smps,
	.set_mode		= palmas_set_mode_smps,
	.get_mode		= palmas_get_mode_smps,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= palmas_list_voltage_smps,
	.map_voltage		= palmas_map_voltage_smps,
};

static struct regulator_ops palmas_ops_smps10 = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
};

static int palmas_is_enabled_ldo(struct regulator_dev *dev)
{
	struct palmas_pmic *pmic = rdev_get_drvdata(dev);
	int id = rdev_get_id(dev);
	unsigned int reg;

	palmas_ldo_read(pmic->palmas, palmas_regs_info[id].ctrl_addr, &reg);

	reg &= PALMAS_LDO1_CTRL_STATUS;

	return !!(reg);
}

static struct regulator_ops palmas_ops_ldo = {
	.is_enabled		= palmas_is_enabled_ldo,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
};

/*
 * setup the hardware based sleep configuration of the SMPS/LDO regulators
 * from the platform data. This is different to the software based control
 * supported by the regulator framework as it is controlled by toggling
 * pins on the PMIC such as PREQ, SYSEN, ...
 */
static int palmas_smps_init(struct palmas *palmas, int id,
		struct palmas_reg_init *reg_init)
{
	unsigned int reg;
	unsigned int addr;
	int ret;

	addr = palmas_regs_info[id].ctrl_addr;

	ret = palmas_smps_read(palmas, addr, &reg);
	if (ret)
		return ret;

	switch (id) {
	case PALMAS_REG_SMPS10:
		if (reg_init->mode_sleep) {
			reg &= ~PALMAS_SMPS10_CTRL_MODE_SLEEP_MASK;
			reg |= reg_init->mode_sleep <<
					PALMAS_SMPS10_CTRL_MODE_SLEEP_SHIFT;
		}
		break;
	default:
		if (reg_init->warm_reset)
			reg |= PALMAS_SMPS12_CTRL_WR_S;

		if (reg_init->roof_floor)
			reg |= PALMAS_SMPS12_CTRL_ROOF_FLOOR_EN;

		if (reg_init->mode_sleep) {
			reg &= ~PALMAS_SMPS12_CTRL_MODE_SLEEP_MASK;
			reg |= reg_init->mode_sleep <<
					PALMAS_SMPS12_CTRL_MODE_SLEEP_SHIFT;
		}
	}

	ret = palmas_smps_write(palmas, addr, reg);
	if (ret)
		return ret;

	if (palmas_regs_info[id].tstep_addr && reg_init->tstep) {
		addr = palmas_regs_info[id].tstep_addr;

		reg = reg_init->tstep & PALMAS_SMPS12_TSTEP_TSTEP_MASK;

		ret = palmas_smps_write(palmas, addr, reg);
		if (ret)
			return ret;
	}

	if (palmas_regs_info[id].vsel_addr && reg_init->vsel) {
		addr = palmas_regs_info[id].vsel_addr;

		reg = reg_init->vsel;

		ret = palmas_smps_write(palmas, addr, reg);
		if (ret)
			return ret;
	}


	return 0;
}

static int palmas_ldo_init(struct palmas *palmas, int id,
		struct palmas_reg_init *reg_init)
{
	unsigned int reg;
	unsigned int addr;
	int ret;

	addr = palmas_regs_info[id].ctrl_addr;

	ret = palmas_ldo_read(palmas, addr, &reg);
	if (ret)
		return ret;

	if (reg_init->warm_reset)
		reg |= PALMAS_LDO1_CTRL_WR_S;

	if (reg_init->mode_sleep)
		reg |= PALMAS_LDO1_CTRL_MODE_SLEEP;

	ret = palmas_ldo_write(palmas, addr, reg);
	if (ret)
		return ret;

	return 0;
}

static struct of_regulator_match palmas_matches[] = {
	{ .name = "smps12", },
	{ .name = "smps123", },
	{ .name = "smps3", },
	{ .name = "smps45", },
	{ .name = "smps457", },
	{ .name = "smps6", },
	{ .name = "smps7", },
	{ .name = "smps8", },
	{ .name = "smps9", },
	{ .name = "smps10", },
	{ .name = "ldo1", },
	{ .name = "ldo2", },
	{ .name = "ldo3", },
	{ .name = "ldo4", },
	{ .name = "ldo5", },
	{ .name = "ldo6", },
	{ .name = "ldo7", },
	{ .name = "ldo8", },
	{ .name = "ldo9", },
	{ .name = "ldoln", },
	{ .name = "ldousb", },
};

static void palmas_dt_to_pdata(struct device *dev,
		struct device_node *node,
		struct palmas_pmic_platform_data *pdata)
{
	struct device_node *regulators;
	u32 prop;
	int idx, ret;

	node = of_node_get(node);
	regulators = of_find_node_by_name(node, "regulators");
	if (!regulators) {
		dev_info(dev, "regulator node not found\n");
		return;
	}

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

	for (idx = 0; idx < PALMAS_NUM_REGS; idx++) {
		if (!palmas_matches[idx].init_data ||
				!palmas_matches[idx].of_node)
			continue;

		pdata->reg_data[idx] = palmas_matches[idx].init_data;

		pdata->reg_init[idx] = devm_kzalloc(dev,
				sizeof(struct palmas_reg_init), GFP_KERNEL);

		ret = of_property_read_u32(palmas_matches[idx].of_node,
				"ti,warm_reset", &prop);
		if (!ret)
			pdata->reg_init[idx]->warm_reset = prop;

		ret = of_property_read_u32(palmas_matches[idx].of_node,
				"ti,roof_floor", &prop);
		if (!ret)
			pdata->reg_init[idx]->roof_floor = prop;

		ret = of_property_read_u32(palmas_matches[idx].of_node,
				"ti,mode_sleep", &prop);
		if (!ret)
			pdata->reg_init[idx]->mode_sleep = prop;

		ret = of_property_read_u32(palmas_matches[idx].of_node,
				"ti,warm_reset", &prop);
		if (!ret)
			pdata->reg_init[idx]->warm_reset = prop;

		ret = of_property_read_u32(palmas_matches[idx].of_node,
				"ti,tstep", &prop);
		if (!ret)
			pdata->reg_init[idx]->tstep = prop;

		ret = of_property_read_u32(palmas_matches[idx].of_node,
				"ti,vsel", &prop);
		if (!ret)
			pdata->reg_init[idx]->vsel = prop;
	}

	ret = of_property_read_u32(node, "ti,ldo6_vibrator", &prop);
	if (!ret)
		pdata->ldo6_vibrator = prop;
}


static int palmas_probe(struct platform_device *pdev)
{
	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
	struct palmas_pmic_platform_data *pdata = pdev->dev.platform_data;
	struct device_node *node = pdev->dev.of_node;
	struct regulator_dev *rdev;
	struct regulator_config config = { };
	struct palmas_pmic *pmic;
	struct palmas_reg_init *reg_init;
	int id = 0, ret;
	unsigned int addr, reg;

	if (node && !pdata) {
		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);

		if (!pdata)
			return -ENOMEM;

		palmas_dt_to_pdata(&pdev->dev, node, pdata);
	}

	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
	if (!pmic)
		return -ENOMEM;

	pmic->dev = &pdev->dev;
	pmic->palmas = palmas;
	palmas->pmic = pmic;
	platform_set_drvdata(pdev, pmic);

	ret = palmas_smps_read(palmas, PALMAS_SMPS_CTRL, &reg);
	if (ret)
		return ret;

	if (reg & PALMAS_SMPS_CTRL_SMPS12_SMPS123_EN)
		pmic->smps123 = 1;

	if (reg & PALMAS_SMPS_CTRL_SMPS45_SMPS457_EN)
		pmic->smps457 = 1;

	config.regmap = palmas->regmap[REGULATOR_SLAVE];
	config.dev = &pdev->dev;
	config.driver_data = pmic;

	for (id = 0; id < PALMAS_REG_LDO1; id++) {

		/*
		 * Miss out regulators which are not available due
		 * to slaving configurations.
		 */
		switch (id) {
		case PALMAS_REG_SMPS12:
		case PALMAS_REG_SMPS3:
			if (pmic->smps123)
				continue;
			break;
		case PALMAS_REG_SMPS123:
			if (!pmic->smps123)
				continue;
			break;
		case PALMAS_REG_SMPS45:
		case PALMAS_REG_SMPS7:
			if (pmic->smps457)
				continue;
			break;
		case PALMAS_REG_SMPS457:
			if (!pmic->smps457)
				continue;
		}

		/* Initialise sleep/init values from platform data */
		if (pdata && pdata->reg_init[id]) {
			reg_init = pdata->reg_init[id];
			ret = palmas_smps_init(palmas, id, reg_init);
			if (ret)
				goto err_unregister_regulator;
		}

		/* Register the regulators */
		pmic->desc[id].name = palmas_regs_info[id].name;
		pmic->desc[id].id = id;

		switch (id) {
		case PALMAS_REG_SMPS10:
			pmic->desc[id].n_voltages = PALMAS_SMPS10_NUM_VOLTAGES;
			pmic->desc[id].ops = &palmas_ops_smps10;
			pmic->desc[id].vsel_reg =
					PALMAS_BASE_TO_REG(PALMAS_SMPS_BASE,
							PALMAS_SMPS10_CTRL);
			pmic->desc[id].vsel_mask = SMPS10_VSEL;
			pmic->desc[id].enable_reg =
					PALMAS_BASE_TO_REG(PALMAS_SMPS_BASE,
							PALMAS_SMPS10_STATUS);
			pmic->desc[id].enable_mask = SMPS10_BOOST_EN;
			pmic->desc[id].min_uV = 3750000;
			pmic->desc[id].uV_step = 1250000;
			break;
		default:
			/*
			 * Read and store the RANGE bit for later use
			 * This must be done before regulator is probed,
			 * otherwise we error in probe with unsupportable ranges.
			 */
			addr = palmas_regs_info[id].vsel_addr;

			ret = palmas_smps_read(pmic->palmas, addr, &reg);
			if (ret)
				goto err_unregister_regulator;
			if (reg & PALMAS_SMPS12_VOLTAGE_RANGE)
				pmic->range[id] = 1;

			pmic->desc[id].ops = &palmas_ops_smps;
			pmic->desc[id].n_voltages = PALMAS_SMPS_NUM_VOLTAGES;
			pmic->desc[id].vsel_reg =
					PALMAS_BASE_TO_REG(PALMAS_SMPS_BASE,
						palmas_regs_info[id].vsel_addr);
			pmic->desc[id].vsel_mask =
					PALMAS_SMPS12_VOLTAGE_VSEL_MASK;
		}

		pmic->desc[id].type = REGULATOR_VOLTAGE;
		pmic->desc[id].owner = THIS_MODULE;

		if (pdata)
			config.init_data = pdata->reg_data[id];
		else
			config.init_data = NULL;

		config.of_node = palmas_matches[id].of_node;

		rdev = regulator_register(&pmic->desc[id], &config);
		if (IS_ERR(rdev)) {
			dev_err(&pdev->dev,
				"failed to register %s regulator\n",
				pdev->name);
			ret = PTR_ERR(rdev);
			goto err_unregister_regulator;
		}

		/* Save regulator for cleanup */
		pmic->rdev[id] = rdev;
	}

	/* Start this loop from the id left from previous loop */
	for (; id < PALMAS_NUM_REGS; id++) {

		/* Miss out regulators which are not available due
		 * to alternate functions.
		 */

		/* Register the regulators */
		pmic->desc[id].name = palmas_regs_info[id].name;
		pmic->desc[id].id = id;
		pmic->desc[id].n_voltages = PALMAS_LDO_NUM_VOLTAGES;

		pmic->desc[id].ops = &palmas_ops_ldo;

		pmic->desc[id].type = REGULATOR_VOLTAGE;
		pmic->desc[id].owner = THIS_MODULE;
		pmic->desc[id].min_uV = 900000;
		pmic->desc[id].uV_step = 50000;
		pmic->desc[id].linear_min_sel = 1;
		pmic->desc[id].vsel_reg = PALMAS_BASE_TO_REG(PALMAS_LDO_BASE,
						palmas_regs_info[id].vsel_addr);
		pmic->desc[id].vsel_mask = PALMAS_LDO1_VOLTAGE_VSEL_MASK;
		pmic->desc[id].enable_reg = PALMAS_BASE_TO_REG(PALMAS_LDO_BASE,
						palmas_regs_info[id].ctrl_addr);
		pmic->desc[id].enable_mask = PALMAS_LDO1_CTRL_MODE_ACTIVE;

		if (pdata)
			config.init_data = pdata->reg_data[id];
		else
			config.init_data = NULL;

		config.of_node = palmas_matches[id].of_node;

		rdev = regulator_register(&pmic->desc[id], &config);
		if (IS_ERR(rdev)) {
			dev_err(&pdev->dev,
				"failed to register %s regulator\n",
				pdev->name);
			ret = PTR_ERR(rdev);
			goto err_unregister_regulator;
		}

		/* Save regulator for cleanup */
		pmic->rdev[id] = rdev;

		/* Initialise sleep/init values from platform data */
		if (pdata) {
			reg_init = pdata->reg_init[id];
			if (reg_init) {
				ret = palmas_ldo_init(palmas, id, reg_init);
				if (ret) {
					regulator_unregister(pmic->rdev[id]);
					goto err_unregister_regulator;
				}
			}
		}
	}

	return 0;

err_unregister_regulator:
	while (--id >= 0)
		regulator_unregister(pmic->rdev[id]);
	return ret;
}

static int palmas_remove(struct platform_device *pdev)
{
	struct palmas_pmic *pmic = platform_get_drvdata(pdev);
	int id;

	for (id = 0; id < PALMAS_NUM_REGS; id++)
		regulator_unregister(pmic->rdev[id]);
	return 0;
}

static struct of_device_id of_palmas_match_tbl[] = {
	{ .compatible = "ti,palmas-pmic", },
	{ /* end */ }
};

static struct platform_driver palmas_driver = {
	.driver = {
		.name = "palmas-pmic",
		.of_match_table = of_palmas_match_tbl,
		.owner = THIS_MODULE,
	},
	.probe = palmas_probe,
	.remove = palmas_remove,
};

static int __init palmas_init(void)
{
	return platform_driver_register(&palmas_driver);
}
subsys_initcall(palmas_init);

static void __exit palmas_exit(void)
{
	platform_driver_unregister(&palmas_driver);
}
module_exit(palmas_exit);

MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
MODULE_DESCRIPTION("Palmas voltage regulator driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:palmas-pmic");
MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);