summaryrefslogtreecommitdiff
path: root/drivers/regulator/da9121-regulator.c
blob: e66925090258021f75ebd1c994efccaa492f3282 (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
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
// SPDX-License-Identifier: GPL-2.0-only
//
// DA9121 Single-channel dual-phase 10A buck converter
//
// Copyright (C) 2020 Axis Communications AB
//
// DA9130 Single-channel dual-phase 10A buck converter (Automotive)
// DA9217 Single-channel dual-phase  6A buck converter
// DA9122 Dual-channel single-phase  5A buck converter
// DA9131 Dual-channel single-phase  5A buck converter (Automotive)
// DA9220 Dual-channel single-phase  3A buck converter
// DA9132 Dual-channel single-phase  3A buck converter (Automotive)
//
// Copyright (C) 2020 Dialog Semiconductor

#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/regulator/da9121.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>

#include "da9121-regulator.h"

/* Chip data */
struct da9121 {
	struct device *dev;
	struct delayed_work work;
	struct da9121_pdata *pdata;
	struct regmap *regmap;
	struct regulator_dev *rdev[DA9121_IDX_MAX];
	unsigned int persistent[2];
	unsigned int passive_delay;
	int chip_irq;
	int variant_id;
	int subvariant_id;
};

/* Define ranges for different variants, enabling translation to/from
 * registers. Maximums give scope to allow for transients.
 */
struct da9121_range {
	int val_min;
	int val_max;
	int val_stp;
	int reg_min;
	int reg_max;
};

static struct da9121_range da9121_10A_2phase_current = {
	.val_min =  7000000,
	.val_max = 20000000,
	.val_stp =  1000000,
	.reg_min = 1,
	.reg_max = 14,
};

static struct da9121_range da9121_6A_2phase_current = {
	.val_min =  7000000,
	.val_max = 12000000,
	.val_stp =  1000000,
	.reg_min = 1,
	.reg_max = 6,
};

static struct da9121_range da9121_5A_1phase_current = {
	.val_min =  3500000,
	.val_max = 10000000,
	.val_stp =   500000,
	.reg_min = 1,
	.reg_max = 14,
};

static struct da9121_range da9121_3A_1phase_current = {
	.val_min = 3500000,
	.val_max = 6000000,
	.val_stp =  500000,
	.reg_min = 1,
	.reg_max = 6,
};

struct da9121_variant_info {
	int num_bucks;
	int num_phases;
	struct da9121_range *current_range;
};

static const struct da9121_variant_info variant_parameters[] = {
	{ 1, 2, &da9121_10A_2phase_current },	//DA9121_TYPE_DA9121_DA9130
	{ 2, 1, &da9121_3A_1phase_current  },	//DA9121_TYPE_DA9220_DA9132
	{ 2, 1, &da9121_5A_1phase_current  },	//DA9121_TYPE_DA9122_DA9131
	{ 1, 2, &da9121_6A_2phase_current  },	//DA9121_TYPE_DA9217
};

struct da9121_field {
	unsigned int reg;
	unsigned int msk;
};

static const struct da9121_field da9121_current_field[2] = {
	{ DA9121_REG_BUCK_BUCK1_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
	{ DA9xxx_REG_BUCK_BUCK2_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
};

static const struct da9121_field da9121_mode_field[2] = {
	{ DA9121_REG_BUCK_BUCK1_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
	{ DA9xxx_REG_BUCK_BUCK2_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
};

struct status_event_data {
	int buck_id; /* 0=core, 1/2-buck */
	int reg_index;  /* index for status/event/mask register selection */
	int status_bit; /* bit masks... */
	int event_bit;
	int mask_bit;
	unsigned long notification; /* Notification for status inception */
	char *warn; /* if NULL, notify - otherwise dev_warn this string */
};

#define DA9121_STATUS(id, bank, name, notification, warning) \
	{ id, bank, \
	DA9121_MASK_SYS_STATUS_##bank##_##name, \
	DA9121_MASK_SYS_EVENT_##bank##_E_##name, \
	DA9121_MASK_SYS_MASK_##bank##_M_##name, \
	notification, warning }

/* For second buck related event bits that are specific to DA9122, DA9220 variants */
#define DA9xxx_STATUS(id, bank, name, notification, warning) \
	{ id, bank, \
	DA9xxx_MASK_SYS_STATUS_##bank##_##name, \
	DA9xxx_MASK_SYS_EVENT_##bank##_E_##name, \
	DA9xxx_MASK_SYS_MASK_##bank##_M_##name, \
	notification, warning }

/* The status signals that may need servicing, depending on device variant.
 * After assertion, they persist; so event is notified, the IRQ disabled,
 * and status polled until clear again and IRQ is reenabled.
 *
 * SG/PG1/PG2 should be set when device first powers up and should never
 * re-occur. When this driver starts, it is expected that these will have
 * self-cleared for when the IRQs are enabled, so these should never be seen.
 * If seen, the implication is that the device has reset.
 *
 * GPIO0/1/2 are not configured for use by default, so should not be seen.
 */
static const struct status_event_data status_event_handling[] = {
	DA9xxx_STATUS(0, 0, SG, 0, "Handled E_SG\n"),
	DA9121_STATUS(0, 0, TEMP_CRIT, (REGULATOR_EVENT_OVER_TEMP|REGULATOR_EVENT_DISABLE), NULL),
	DA9121_STATUS(0, 0, TEMP_WARN, REGULATOR_EVENT_OVER_TEMP, NULL),
	DA9121_STATUS(1, 1, PG1, 0, "Handled E_PG1\n"),
	DA9121_STATUS(1, 1, OV1, REGULATOR_EVENT_REGULATION_OUT, NULL),
	DA9121_STATUS(1, 1, UV1, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
	DA9121_STATUS(1, 1, OC1, REGULATOR_EVENT_OVER_CURRENT, NULL),
	DA9xxx_STATUS(2, 1, PG2, 0, "Handled E_PG2\n"),
	DA9xxx_STATUS(2, 1, OV2, REGULATOR_EVENT_REGULATION_OUT, NULL),
	DA9xxx_STATUS(2, 1, UV2, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
	DA9xxx_STATUS(2, 1, OC2, REGULATOR_EVENT_OVER_CURRENT, NULL),
	DA9121_STATUS(0, 2, GPIO0, 0, "Handled E_GPIO0\n"),
	DA9121_STATUS(0, 2, GPIO1, 0, "Handled E_GPIO1\n"),
	DA9121_STATUS(0, 2, GPIO2, 0, "Handled E_GPIO2\n"),
};

static int da9121_get_current_limit(struct regulator_dev *rdev)
{
	struct da9121 *chip = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	struct da9121_range *range =
		variant_parameters[chip->variant_id].current_range;
	unsigned int val = 0;
	int ret = 0;

	ret = regmap_read(chip->regmap, da9121_current_field[id].reg, &val);
	if (ret < 0) {
		dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
		goto error;
	}

	if (val < range->reg_min) {
		ret = -EACCES;
		goto error;
	}

	if (val > range->reg_max) {
		ret = -EINVAL;
		goto error;
	}

	return range->val_min + (range->val_stp * (val - range->reg_min));
error:
	return ret;
}

static int da9121_ceiling_selector(struct regulator_dev *rdev,
		int min, int max,
		unsigned int *selector)
{
	struct da9121 *chip = rdev_get_drvdata(rdev);
	struct da9121_range *range =
		variant_parameters[chip->variant_id].current_range;
	unsigned int level;
	unsigned int i = 0;
	unsigned int sel = 0;
	int ret = 0;

	if (range->val_min > max || range->val_max < min) {
		dev_err(chip->dev,
			"Requested current out of regulator capability\n");
		ret = -EINVAL;
		goto error;
	}

	level = range->val_max;
	for (i = range->reg_max; i >= range->reg_min; i--) {
		if (level <= max) {
			sel = i;
			break;
		}
		level -= range->val_stp;
	}

	if (level < min) {
		dev_err(chip->dev,
			"Best match falls below minimum requested current\n");
		ret = -EINVAL;
		goto error;
	}

	*selector = sel;
error:
	return ret;
}

static int da9121_set_current_limit(struct regulator_dev *rdev,
				int min_ua, int max_ua)
{
	struct da9121 *chip = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	struct da9121_range *range =
		variant_parameters[chip->variant_id].current_range;
	unsigned int sel = 0;
	int ret = 0;

	if (min_ua < range->val_min ||
	    max_ua > range->val_max) {
		ret = -EINVAL;
		goto error;
	}

	ret = da9121_ceiling_selector(rdev, min_ua, max_ua, &sel);
	if (ret < 0)
		goto error;

	ret = regmap_update_bits(chip->regmap,
				da9121_current_field[id].reg,
				da9121_current_field[id].msk,
				(unsigned int)sel);
	if (ret < 0)
		dev_err(chip->dev, "Cannot update BUCK current limit, err: %d\n", ret);

error:
	return ret;
}

static unsigned int da9121_map_mode(unsigned int mode)
{
	switch (mode) {
	case DA9121_BUCK_MODE_FORCE_PWM:
		return REGULATOR_MODE_FAST;
	case DA9121_BUCK_MODE_FORCE_PWM_SHEDDING:
		return REGULATOR_MODE_NORMAL;
	case DA9121_BUCK_MODE_AUTO:
		return REGULATOR_MODE_IDLE;
	case DA9121_BUCK_MODE_FORCE_PFM:
		return REGULATOR_MODE_STANDBY;
	default:
		return REGULATOR_MODE_INVALID;
	}
}

static int da9121_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct da9121 *chip = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	unsigned int val;

	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = DA9121_BUCK_MODE_FORCE_PWM;
		break;
	case REGULATOR_MODE_NORMAL:
		val = DA9121_BUCK_MODE_FORCE_PWM_SHEDDING;
		break;
	case REGULATOR_MODE_IDLE:
		val = DA9121_BUCK_MODE_AUTO;
		break;
	case REGULATOR_MODE_STANDBY:
		val = DA9121_BUCK_MODE_FORCE_PFM;
		break;
	default:
		return -EINVAL;
	}

	return regmap_update_bits(chip->regmap,
				  da9121_mode_field[id].reg,
				  da9121_mode_field[id].msk,
				  val);
}

static unsigned int da9121_buck_get_mode(struct regulator_dev *rdev)
{
	struct da9121 *chip = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	unsigned int val, mode;
	int ret = 0;

	ret = regmap_read(chip->regmap, da9121_mode_field[id].reg, &val);
	if (ret < 0) {
		dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
		return -EINVAL;
	}

	mode = da9121_map_mode(val & da9121_mode_field[id].msk);
	if (mode == REGULATOR_MODE_INVALID)
		return -EINVAL;

	return mode;
}

static const struct regulator_ops da9121_buck_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.get_current_limit = da9121_get_current_limit,
	.set_current_limit = da9121_set_current_limit,
	.set_mode = da9121_buck_set_mode,
	.get_mode = da9121_buck_get_mode,
};

static struct of_regulator_match da9121_matches[] = {
	[DA9121_IDX_BUCK1] = { .name = "buck1" },
	[DA9121_IDX_BUCK2] = { .name = "buck2" },
};

static int da9121_of_parse_cb(struct device_node *np,
				const struct regulator_desc *desc,
				struct regulator_config *config)
{
	struct da9121 *chip = config->driver_data;
	struct da9121_pdata *pdata;
	struct gpio_desc *ena_gpiod;

	if (chip->pdata == NULL) {
		pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
		if (!pdata)
			return -ENOMEM;
	} else {
		pdata = chip->pdata;
	}

	pdata->num_buck++;

	if (pdata->num_buck > variant_parameters[chip->variant_id].num_bucks) {
		dev_err(chip->dev, "Error: excessive regulators for device\n");
		return -ENODEV;
	}

	ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,
						GPIOD_OUT_HIGH |
						GPIOD_FLAGS_BIT_NONEXCLUSIVE,
						"da9121-enable");
	if (!IS_ERR(ena_gpiod))
		config->ena_gpiod = ena_gpiod;

	if (variant_parameters[chip->variant_id].num_bucks == 2) {
		uint32_t ripple_cancel;
		uint32_t ripple_reg;
		int ret;

		if (of_property_read_u32(da9121_matches[pdata->num_buck-1].of_node,
				"dlg,ripple-cancel", &ripple_cancel)) {
			if (pdata->num_buck > 1)
				ripple_reg = DA9xxx_REG_BUCK_BUCK2_7;
			else
				ripple_reg = DA9121_REG_BUCK_BUCK1_7;

			ret = regmap_update_bits(chip->regmap, ripple_reg,
				DA9xxx_MASK_BUCK_BUCKx_7_CHx_RIPPLE_CANCEL,
				ripple_cancel);
			if (ret < 0)
				dev_err(chip->dev, "Cannot set ripple mode, err: %d\n", ret);
		}
	}

	return 0;
}

#define DA9121_MIN_MV		300
#define DA9121_MAX_MV		1900
#define DA9121_STEP_MV		10
#define DA9121_MIN_SEL		(DA9121_MIN_MV / DA9121_STEP_MV)
#define DA9121_N_VOLTAGES	(((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
				 + 1 + DA9121_MIN_SEL)

static const struct regulator_desc da9121_reg = {
	.id = DA9121_IDX_BUCK1,
	.name = "da9121",
	.of_match = "buck1",
	.of_parse_cb = da9121_of_parse_cb,
	.owner = THIS_MODULE,
	.regulators_node = of_match_ptr("regulators"),
	.of_map_mode = da9121_map_mode,
	.ops = &da9121_buck_ops,
	.type = REGULATOR_VOLTAGE,
	.n_voltages = DA9121_N_VOLTAGES,
	.min_uV = DA9121_MIN_MV * 1000,
	.uV_step = DA9121_STEP_MV * 1000,
	.linear_min_sel = DA9121_MIN_SEL,
	.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
	.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
	.enable_reg = DA9121_REG_BUCK_BUCK1_0,
	.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
	/* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
	.ramp_delay = 20000,
	/* tBUCK_EN */
	.enable_time = 20,
};

static const struct regulator_desc da9220_reg[2] = {
	{
		.id = DA9121_IDX_BUCK1,
		.name = "DA9220/DA9132 BUCK1",
		.of_match = "buck1",
		.of_parse_cb = da9121_of_parse_cb,
		.owner = THIS_MODULE,
		.regulators_node = of_match_ptr("regulators"),
		.of_map_mode = da9121_map_mode,
		.ops = &da9121_buck_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = DA9121_N_VOLTAGES,
		.min_uV = DA9121_MIN_MV * 1000,
		.uV_step = DA9121_STEP_MV * 1000,
		.linear_min_sel = DA9121_MIN_SEL,
		.enable_reg = DA9121_REG_BUCK_BUCK1_0,
		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
		.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
	},
	{
		.id = DA9121_IDX_BUCK2,
		.name = "DA9220/DA9132 BUCK2",
		.of_match = "buck2",
		.of_parse_cb = da9121_of_parse_cb,
		.owner = THIS_MODULE,
		.regulators_node = of_match_ptr("regulators"),
		.of_map_mode = da9121_map_mode,
		.ops = &da9121_buck_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = DA9121_N_VOLTAGES,
		.min_uV = DA9121_MIN_MV * 1000,
		.uV_step = DA9121_STEP_MV * 1000,
		.linear_min_sel = DA9121_MIN_SEL,
		.enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
		.vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
	}
};

static const struct regulator_desc da9122_reg[2] = {
	{
		.id = DA9121_IDX_BUCK1,
		.name = "DA9122/DA9131 BUCK1",
		.of_match = "buck1",
		.of_parse_cb = da9121_of_parse_cb,
		.owner = THIS_MODULE,
		.regulators_node = of_match_ptr("regulators"),
		.of_map_mode = da9121_map_mode,
		.ops = &da9121_buck_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = DA9121_N_VOLTAGES,
		.min_uV = DA9121_MIN_MV * 1000,
		.uV_step = DA9121_STEP_MV * 1000,
		.linear_min_sel = DA9121_MIN_SEL,
		.enable_reg = DA9121_REG_BUCK_BUCK1_0,
		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
		.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
	},
	{
		.id = DA9121_IDX_BUCK2,
		.name = "DA9122/DA9131 BUCK2",
		.of_match = "buck2",
		.of_parse_cb = da9121_of_parse_cb,
		.owner = THIS_MODULE,
		.regulators_node = of_match_ptr("regulators"),
		.of_map_mode = da9121_map_mode,
		.ops = &da9121_buck_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = DA9121_N_VOLTAGES,
		.min_uV = DA9121_MIN_MV * 1000,
		.uV_step = DA9121_STEP_MV * 1000,
		.linear_min_sel = DA9121_MIN_SEL,
		.enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
		.vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
	}
};

static const struct regulator_desc da9217_reg = {
	.id = DA9121_IDX_BUCK1,
	.name = "DA9217 BUCK1",
	.of_match = "buck1",
	.of_parse_cb = da9121_of_parse_cb,
	.owner = THIS_MODULE,
	.regulators_node = of_match_ptr("regulators"),
	.of_map_mode = da9121_map_mode,
	.ops = &da9121_buck_ops,
	.type = REGULATOR_VOLTAGE,
	.n_voltages = DA9121_N_VOLTAGES,
	.min_uV = DA9121_MIN_MV * 1000,
	.uV_step = DA9121_STEP_MV * 1000,
	.linear_min_sel = DA9121_MIN_SEL,
	.enable_reg = DA9121_REG_BUCK_BUCK1_0,
	.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
	.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
	.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
};

static const struct regulator_desc *local_da9121_regulators[][DA9121_IDX_MAX] = {
	[DA9121_TYPE_DA9121_DA9130] = { &da9121_reg, NULL },
	[DA9121_TYPE_DA9220_DA9132] = { &da9220_reg[0], &da9220_reg[1] },
	[DA9121_TYPE_DA9122_DA9131] = { &da9122_reg[0], &da9122_reg[1] },
	[DA9121_TYPE_DA9217] = { &da9217_reg, NULL },
};

static void da9121_status_poll_on(struct work_struct *work)
{
	struct da9121 *chip = container_of(work, struct da9121, work.work);
	int status[3] = {0};
	int clear[3] = {0};
	unsigned long delay;
	int i;
	int ret;

	ret = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_STATUS_0, status, 2);
	if (ret < 0) {
		dev_err(chip->dev,
			"Failed to read STATUS registers: %d\n", ret);
		goto error;
	}

	/* Possible events are tested to be within range for the variant, potentially
	 * masked by the IRQ handler (not just warned about), as having been masked,
	 * and the respective state cleared - then flagged to unmask for next IRQ.
	 */
	for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
		const struct status_event_data *item = &status_event_handling[i];
		int reg_idx = item->reg_index;
		bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
		bool supported = (item->warn == NULL);
		bool persisting = (chip->persistent[reg_idx] & item->event_bit);
		bool now_cleared = !(status[reg_idx] & item->status_bit);

		if (relevant && supported && persisting && now_cleared) {
			clear[reg_idx] |= item->mask_bit;
			chip->persistent[reg_idx] &= ~item->event_bit;
		}
	}

	for (i = 0; i < 2; i++) {
		if (clear[i]) {
			unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
			unsigned int mbit = clear[i];

			ret = regmap_update_bits(chip->regmap, reg, mbit, 0);
			if (ret < 0) {
				dev_err(chip->dev,
					"Failed to unmask 0x%02x %d\n",
					reg, ret);
				goto error;
			}
		}
	}

	if (chip->persistent[0] | chip->persistent[1]) {
		delay = msecs_to_jiffies(chip->passive_delay);
		queue_delayed_work(system_freezable_wq, &chip->work, delay);
	}

error:
	return;
}

static irqreturn_t da9121_irq_handler(int irq, void *data)
{
	struct da9121 *chip = data;
	struct regulator_dev *rdev;
	int event[3] = {0};
	int handled[3] = {0};
	int mask[3] = {0};
	int ret = IRQ_NONE;
	int i;
	int err;

	err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_EVENT_0, event, 3);
	if (err < 0) {
		dev_err(chip->dev, "Failed to read EVENT registers %d\n", err);
		ret = IRQ_NONE;
		goto error;
	}

	err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_MASK_0, mask, 3);
	if (err < 0) {
		dev_err(chip->dev,
			"Failed to read MASK registers: %d\n", ret);
		ret = IRQ_NONE;
		goto error;
	}

	rdev = chip->rdev[DA9121_IDX_BUCK1];

	/* Possible events are tested to be within range for the variant, currently
	 * enabled, and having triggered this IRQ. The event may then be notified,
	 * or a warning given for unexpected events - those from device POR, and
	 * currently unsupported GPIO configurations.
	 */
	for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
		const struct status_event_data *item = &status_event_handling[i];
		int reg_idx = item->reg_index;
		bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
		bool enabled = !(mask[reg_idx] & item->mask_bit);
		bool active = (event[reg_idx] & item->event_bit);
		bool notify = (item->warn == NULL);

		if (relevant && enabled && active) {
			if (notify) {
				chip->persistent[reg_idx] |= item->event_bit;
				regulator_notifier_call_chain(rdev, item->notification, NULL);
			} else {
				dev_warn(chip->dev, item->warn);
				handled[reg_idx] |= item->event_bit;
				ret = IRQ_HANDLED;
			}
		}
	}

	for (i = 0; i < 3; i++) {
		if (event[i] != handled[i]) {
			dev_warn(chip->dev,
				"Unhandled event(s) in bank%d 0x%02x\n", i,
				event[i] ^ handled[i]);
		}
	}

	/* Mask the interrupts for persistent events OV, OC, UV, WARN, CRIT */
	for (i = 0; i < 2; i++) {
		if (handled[i]) {
			unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
			unsigned int mbit = handled[i];

			err = regmap_update_bits(chip->regmap, reg, mbit, mbit);
			if (err < 0) {
				dev_err(chip->dev,
					"Failed to mask 0x%02x interrupt %d\n",
					reg, err);
				ret = IRQ_NONE;
				goto error;
			}
		}
	}

	/* clear the events */
	if (handled[0] | handled[1] | handled[2]) {
		err = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_EVENT_0, handled, 3);
		if (err < 0) {
			dev_err(chip->dev, "Fail to write EVENTs %d\n", err);
			ret = IRQ_NONE;
			goto error;
		}
	}

	queue_delayed_work(system_freezable_wq, &chip->work, 0);
error:
	return ret;
}

static int da9121_set_regulator_config(struct da9121 *chip)
{
	struct regulator_config config = { };
	unsigned int max_matches = variant_parameters[chip->variant_id].num_bucks;
	int ret = 0;
	int i;

	for (i = 0; i < max_matches; i++) {
		const struct regulator_desc *regl_desc =
			local_da9121_regulators[chip->variant_id][i];

		config.dev = chip->dev;
		config.driver_data = chip;
		config.regmap = chip->regmap;

		chip->rdev[i] = devm_regulator_register(chip->dev,
					regl_desc, &config);
		if (IS_ERR(chip->rdev[i])) {
			dev_err(chip->dev, "Failed to register regulator %s, %d/%d\n",
				regl_desc->name, (i+1), max_matches);
			ret = PTR_ERR(chip->rdev[i]);
			goto error;
		}
	}

error:
	return ret;
}

/* DA9121 chip register model */
static const struct regmap_range da9121_1ch_readable_ranges[] = {
	regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
	regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
	regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
	regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
	regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
};

static const struct regmap_access_table da9121_1ch_readable_table = {
	.yes_ranges = da9121_1ch_readable_ranges,
	.n_yes_ranges = ARRAY_SIZE(da9121_1ch_readable_ranges),
};

static const struct regmap_range da9121_2ch_readable_ranges[] = {
	regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
	regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
	regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
	regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_7),
	regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_7),
	regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
};

static const struct regmap_access_table da9121_2ch_readable_table = {
	.yes_ranges = da9121_2ch_readable_ranges,
	.n_yes_ranges = ARRAY_SIZE(da9121_2ch_readable_ranges),
};

static const struct regmap_range da9121_1ch_writeable_ranges[] = {
	regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
	regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
	regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
	regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
	regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_6),
};

static const struct regmap_access_table da9121_1ch_writeable_table = {
	.yes_ranges = da9121_1ch_writeable_ranges,
	.n_yes_ranges = ARRAY_SIZE(da9121_1ch_writeable_ranges),
};

static const struct regmap_range da9121_2ch_writeable_ranges[] = {
	regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
	regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
	regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
	regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
	regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_7),
	regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_2),
	regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_4, DA9xxx_REG_BUCK_BUCK2_7),
};

static const struct regmap_access_table da9121_2ch_writeable_table = {
	.yes_ranges = da9121_2ch_writeable_ranges,
	.n_yes_ranges = ARRAY_SIZE(da9121_2ch_writeable_ranges),
};


static const struct regmap_range da9121_volatile_ranges[] = {
	regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_EVENT_2),
	regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
	regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
};

static const struct regmap_access_table da9121_volatile_table = {
	.yes_ranges = da9121_volatile_ranges,
	.n_yes_ranges = ARRAY_SIZE(da9121_volatile_ranges),
};

/* DA9121 regmap config for 1 channel variants */
static struct regmap_config da9121_1ch_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = DA9121_REG_OTP_CONFIG_ID,
	.rd_table = &da9121_1ch_readable_table,
	.wr_table = &da9121_1ch_writeable_table,
	.volatile_table = &da9121_volatile_table,
	.cache_type = REGCACHE_RBTREE,
};

/* DA9121 regmap config for 2 channel variants */
static struct regmap_config da9121_2ch_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = DA9121_REG_OTP_CONFIG_ID,
	.rd_table = &da9121_2ch_readable_table,
	.wr_table = &da9121_2ch_writeable_table,
	.volatile_table = &da9121_volatile_table,
	.cache_type = REGCACHE_RBTREE,
};

static int da9121_check_device_type(struct i2c_client *i2c, struct da9121 *chip)
{
	u32 device_id;
	u32 variant_id;
	u8 variant_mrc, variant_vrc;
	char *type;
	bool config_match = false;
	int ret = 0;

	ret = regmap_read(chip->regmap, DA9121_REG_OTP_DEVICE_ID, &device_id);
	if (ret < 0) {
		dev_err(chip->dev, "Cannot read device ID: %d\n", ret);
		goto error;
	}

	ret = regmap_read(chip->regmap, DA9121_REG_OTP_VARIANT_ID, &variant_id);
	if (ret < 0) {
		dev_err(chip->dev, "Cannot read variant ID: %d\n", ret);
		goto error;
	}

	if (device_id != DA9121_DEVICE_ID) {
		dev_err(chip->dev, "Invalid device ID: 0x%02x\n", device_id);
		ret = -ENODEV;
		goto error;
	}

	variant_vrc = variant_id & DA9121_MASK_OTP_VARIANT_ID_VRC;

	switch (chip->subvariant_id) {
	case DA9121_SUBTYPE_DA9121:
		type = "DA9121";
		config_match = (variant_vrc == DA9121_VARIANT_VRC);
		break;
	case DA9121_SUBTYPE_DA9130:
		type = "DA9130";
		config_match = (variant_vrc == DA9130_VARIANT_VRC);
		break;
	case DA9121_SUBTYPE_DA9220:
		type = "DA9220";
		config_match = (variant_vrc == DA9220_VARIANT_VRC);
		break;
	case DA9121_SUBTYPE_DA9132:
		type = "DA9132";
		config_match = (variant_vrc == DA9132_VARIANT_VRC);
		break;
	case DA9121_SUBTYPE_DA9122:
		type = "DA9122";
		config_match = (variant_vrc == DA9122_VARIANT_VRC);
		break;
	case DA9121_SUBTYPE_DA9131:
		type = "DA9131";
		config_match = (variant_vrc == DA9131_VARIANT_VRC);
		break;
	case DA9121_SUBTYPE_DA9217:
		type = "DA9217";
		config_match = (variant_vrc == DA9217_VARIANT_VRC);
		break;
	default:
		type = "Unknown";
		break;
	}

	dev_info(chip->dev,
		 "Device detected (device-ID: 0x%02X, var-ID: 0x%02X, %s)\n",
		 device_id, variant_id, type);

	if (!config_match) {
		dev_err(chip->dev, "Device tree configuration does not match detected device.\n");
		ret = -EINVAL;
		goto error;
	}

	variant_mrc = (variant_id & DA9121_MASK_OTP_VARIANT_ID_MRC)
			>> DA9121_SHIFT_OTP_VARIANT_ID_MRC;

	if ((device_id == DA9121_DEVICE_ID) &&
	    (variant_mrc < DA9121_VARIANT_MRC_BASE)) {
		dev_err(chip->dev,
			"Cannot support variant MRC: 0x%02X\n", variant_mrc);
		ret = -EINVAL;
	}
error:
	return ret;
}

static int da9121_assign_chip_model(struct i2c_client *i2c,
			struct da9121 *chip)
{
	struct regmap_config *regmap;
	int ret = 0;

	chip->dev = &i2c->dev;

	/* Use configured subtype to select the regulator descriptor index and
	 * register map, common to both consumer and automotive grade variants
	 */
	switch (chip->subvariant_id) {
	case DA9121_SUBTYPE_DA9121:
	case DA9121_SUBTYPE_DA9130:
		chip->variant_id = DA9121_TYPE_DA9121_DA9130;
		regmap = &da9121_1ch_regmap_config;
		break;
	case DA9121_SUBTYPE_DA9217:
		chip->variant_id = DA9121_TYPE_DA9217;
		regmap = &da9121_1ch_regmap_config;
		break;
	case DA9121_SUBTYPE_DA9122:
	case DA9121_SUBTYPE_DA9131:
		chip->variant_id = DA9121_TYPE_DA9122_DA9131;
		regmap = &da9121_2ch_regmap_config;
		break;
	case DA9121_SUBTYPE_DA9220:
	case DA9121_SUBTYPE_DA9132:
		chip->variant_id = DA9121_TYPE_DA9220_DA9132;
		regmap = &da9121_2ch_regmap_config;
		break;
	}

	/* Set these up for of_regulator_match call which may want .of_map_modes */
	da9121_matches[0].desc = local_da9121_regulators[chip->variant_id][0];
	da9121_matches[1].desc = local_da9121_regulators[chip->variant_id][1];

	chip->regmap = devm_regmap_init_i2c(i2c, regmap);
	if (IS_ERR(chip->regmap)) {
		ret = PTR_ERR(chip->regmap);
		dev_err(chip->dev, "Failed to configure a register map: %d\n",
			ret);
		return ret;
	}

	ret = da9121_check_device_type(i2c, chip);

	return ret;
}

static int da9121_config_irq(struct i2c_client *i2c,
			struct da9121 *chip)
{
	unsigned int p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
	const int mask_all[4] = { 0, 0, 0xFF, 0xFF };
	int ret = 0;

	chip->chip_irq = i2c->irq;

	if (chip->chip_irq != 0) {
		if (!of_property_read_u32(chip->dev->of_node,
					  "dlg,irq-polling-delay-passive-ms",
					  &p_delay)) {
			if (p_delay < DA9121_MIN_POLLING_PERIOD_MS ||
			    p_delay > DA9121_MAX_POLLING_PERIOD_MS) {
				dev_warn(chip->dev,
					 "Out-of-range polling period %d ms\n",
					 p_delay);
				p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
			}
		}

		chip->passive_delay = p_delay;

		ret = request_threaded_irq(chip->chip_irq, NULL,
					da9121_irq_handler,
					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
					"da9121", chip);
		if (ret != 0) {
			dev_err(chip->dev, "Failed IRQ request: %d\n",
				chip->chip_irq);
			goto error;
		}

		ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
		if (ret != 0) {
			dev_err(chip->dev, "Failed to set IRQ masks: %d\n",
				ret);
			goto regmap_error;
		}

		INIT_DELAYED_WORK(&chip->work, da9121_status_poll_on);
		dev_info(chip->dev, "Interrupt polling period set at %d ms\n",
			 chip->passive_delay);
	}
error:
	return ret;
regmap_error:
	free_irq(chip->chip_irq, chip);
	return ret;
}

static const struct of_device_id da9121_dt_ids[] = {
	{ .compatible = "dlg,da9121", .data = (void *) DA9121_SUBTYPE_DA9121 },
	{ .compatible = "dlg,da9130", .data = (void *) DA9121_SUBTYPE_DA9130 },
	{ .compatible = "dlg,da9217", .data = (void *) DA9121_SUBTYPE_DA9217 },
	{ .compatible = "dlg,da9122", .data = (void *) DA9121_SUBTYPE_DA9122 },
	{ .compatible = "dlg,da9131", .data = (void *) DA9121_SUBTYPE_DA9131 },
	{ .compatible = "dlg,da9220", .data = (void *) DA9121_SUBTYPE_DA9220 },
	{ .compatible = "dlg,da9132", .data = (void *) DA9121_SUBTYPE_DA9132 },
	{ }
};
MODULE_DEVICE_TABLE(of, da9121_dt_ids);

static inline int da9121_of_get_id(struct device *dev)
{
	const struct of_device_id *id = of_match_device(da9121_dt_ids, dev);

	if (!id) {
		dev_err(dev, "%s: Failed\n", __func__);
		return -EINVAL;
	}
	return (uintptr_t)id->data;
}

static int da9121_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct da9121 *chip;
	const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
	int ret = 0;

	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);
	if (!chip) {
		ret = -ENOMEM;
		goto error;
	}

	chip->pdata = i2c->dev.platform_data;
	chip->subvariant_id = da9121_of_get_id(&i2c->dev);

	ret = da9121_assign_chip_model(i2c, chip);
	if (ret < 0)
		goto error;

	ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
	if (ret != 0) {
		dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
		goto error;
	}

	ret = da9121_set_regulator_config(chip);
	if (ret < 0)
		goto error;

	ret = da9121_config_irq(i2c, chip);

error:
	return ret;
}

static int da9121_i2c_remove(struct i2c_client *i2c)
{
	struct da9121 *chip = i2c_get_clientdata(i2c);
	const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
	int ret = 0;

	free_irq(chip->chip_irq, chip);
	cancel_delayed_work_sync(&chip->work);

	ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
	if (ret != 0)
		dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
	return ret;
}

static const struct i2c_device_id da9121_i2c_id[] = {
	{"da9121", DA9121_TYPE_DA9121_DA9130},
	{"da9130", DA9121_TYPE_DA9121_DA9130},
	{"da9217", DA9121_TYPE_DA9217},
	{"da9122", DA9121_TYPE_DA9122_DA9131},
	{"da9131", DA9121_TYPE_DA9122_DA9131},
	{"da9220", DA9121_TYPE_DA9220_DA9132},
	{"da9132", DA9121_TYPE_DA9220_DA9132},
	{},
};
MODULE_DEVICE_TABLE(i2c, da9121_i2c_id);

static struct i2c_driver da9121_regulator_driver = {
	.driver = {
		.name = "da9121",
		.of_match_table = of_match_ptr(da9121_dt_ids),
	},
	.probe = da9121_i2c_probe,
	.remove = da9121_i2c_remove,
	.id_table = da9121_i2c_id,
};

module_i2c_driver(da9121_regulator_driver);

MODULE_LICENSE("GPL v2");