summaryrefslogtreecommitdiffstats
path: root/drivers/pinctrl/mvebu/pinctrl-mvebu.c
blob: 77d2221d379da41c95c195eb77ccbe38d9088191 (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
/*
 * Marvell MVEBU pinctrl core driver
 *
 * Authors: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
 *          Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
 *
 * 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/platform_device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>

#include "pinctrl-mvebu.h"

#define MPPS_PER_REG	8
#define MPP_BITS	4
#define MPP_MASK	0xf

struct mvebu_pinctrl_function {
	const char *name;
	const char **groups;
	unsigned num_groups;
};

struct mvebu_pinctrl_group {
	const char *name;
	struct mvebu_mpp_ctrl *ctrl;
	struct mvebu_mpp_ctrl_setting *settings;
	unsigned num_settings;
	unsigned gid;
	unsigned *pins;
	unsigned npins;
};

struct mvebu_pinctrl {
	struct device *dev;
	struct pinctrl_dev *pctldev;
	struct pinctrl_desc desc;
	struct mvebu_pinctrl_group *groups;
	unsigned num_groups;
	struct mvebu_pinctrl_function *functions;
	unsigned num_functions;
	u8 variant;
};

static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_pid(
	struct mvebu_pinctrl *pctl, unsigned pid)
{
	unsigned n;
	for (n = 0; n < pctl->num_groups; n++) {
		if (pid >= pctl->groups[n].pins[0] &&
		    pid < pctl->groups[n].pins[0] +
			pctl->groups[n].npins)
			return &pctl->groups[n];
	}
	return NULL;
}

static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_name(
	struct mvebu_pinctrl *pctl, const char *name)
{
	unsigned n;
	for (n = 0; n < pctl->num_groups; n++) {
		if (strcmp(name, pctl->groups[n].name) == 0)
			return &pctl->groups[n];
	}
	return NULL;
}

static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_val(
	struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp,
	unsigned long config)
{
	unsigned n;
	for (n = 0; n < grp->num_settings; n++) {
		if (config == grp->settings[n].val) {
			if (!pctl->variant || (pctl->variant &
					       grp->settings[n].variant))
				return &grp->settings[n];
		}
	}
	return NULL;
}

static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_name(
	struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp,
	const char *name)
{
	unsigned n;
	for (n = 0; n < grp->num_settings; n++) {
		if (strcmp(name, grp->settings[n].name) == 0) {
			if (!pctl->variant || (pctl->variant &
					       grp->settings[n].variant))
				return &grp->settings[n];
		}
	}
	return NULL;
}

static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_gpio_setting(
	struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp)
{
	unsigned n;
	for (n = 0; n < grp->num_settings; n++) {
		if (grp->settings[n].flags &
			(MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
			if (!pctl->variant || (pctl->variant &
						grp->settings[n].variant))
				return &grp->settings[n];
		}
	}
	return NULL;
}

static struct mvebu_pinctrl_function *mvebu_pinctrl_find_function_by_name(
	struct mvebu_pinctrl *pctl, const char *name)
{
	unsigned n;
	for (n = 0; n < pctl->num_functions; n++) {
		if (strcmp(name, pctl->functions[n].name) == 0)
			return &pctl->functions[n];
	}
	return NULL;
}

static int mvebu_pinconf_group_get(struct pinctrl_dev *pctldev,
				unsigned gid, unsigned long *config)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];

	if (!grp->ctrl)
		return -EINVAL;

	return grp->ctrl->mpp_get(grp->pins[0], config);
}

static int mvebu_pinconf_group_set(struct pinctrl_dev *pctldev,
				unsigned gid, unsigned long *configs,
				unsigned num_configs)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
	int i, ret;

	if (!grp->ctrl)
		return -EINVAL;

	for (i = 0; i < num_configs; i++) {
		ret = grp->ctrl->mpp_set(grp->pins[0], configs[i]);
		if (ret)
			return ret;
	} /* for each config */

	return 0;
}

static void mvebu_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
					struct seq_file *s, unsigned gid)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
	struct mvebu_mpp_ctrl_setting *curr;
	unsigned long config;
	unsigned n;

	if (mvebu_pinconf_group_get(pctldev, gid, &config))
		return;

	curr = mvebu_pinctrl_find_setting_by_val(pctl, grp, config);

	if (curr) {
		seq_printf(s, "current: %s", curr->name);
		if (curr->subname)
			seq_printf(s, "(%s)", curr->subname);
		if (curr->flags & (MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
			seq_printf(s, "(");
			if (curr->flags & MVEBU_SETTING_GPI)
				seq_printf(s, "i");
			if (curr->flags & MVEBU_SETTING_GPO)
				seq_printf(s, "o");
			seq_printf(s, ")");
		}
	} else
		seq_printf(s, "current: UNKNOWN");

	if (grp->num_settings > 1) {
		seq_printf(s, ", available = [");
		for (n = 0; n < grp->num_settings; n++) {
			if (curr == &grp->settings[n])
				continue;

			/* skip unsupported settings for this variant */
			if (pctl->variant &&
			    !(pctl->variant & grp->settings[n].variant))
				continue;

			seq_printf(s, " %s", grp->settings[n].name);
			if (grp->settings[n].subname)
				seq_printf(s, "(%s)", grp->settings[n].subname);
			if (grp->settings[n].flags &
				(MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
				seq_printf(s, "(");
				if (grp->settings[n].flags & MVEBU_SETTING_GPI)
					seq_printf(s, "i");
				if (grp->settings[n].flags & MVEBU_SETTING_GPO)
					seq_printf(s, "o");
				seq_printf(s, ")");
			}
		}
		seq_printf(s, " ]");
	}
	return;
}

static const struct pinconf_ops mvebu_pinconf_ops = {
	.pin_config_group_get = mvebu_pinconf_group_get,
	.pin_config_group_set = mvebu_pinconf_group_set,
	.pin_config_group_dbg_show = mvebu_pinconf_group_dbg_show,
};

static int mvebu_pinmux_get_funcs_count(struct pinctrl_dev *pctldev)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);

	return pctl->num_functions;
}

static const char *mvebu_pinmux_get_func_name(struct pinctrl_dev *pctldev,
					unsigned fid)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);

	return pctl->functions[fid].name;
}

static int mvebu_pinmux_get_groups(struct pinctrl_dev *pctldev, unsigned fid,
				const char * const **groups,
				unsigned * const num_groups)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);

	*groups = pctl->functions[fid].groups;
	*num_groups = pctl->functions[fid].num_groups;
	return 0;
}

static int mvebu_pinmux_set(struct pinctrl_dev *pctldev, unsigned fid,
			    unsigned gid)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
	struct mvebu_pinctrl_function *func = &pctl->functions[fid];
	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
	struct mvebu_mpp_ctrl_setting *setting;
	int ret;
	unsigned long config;

	setting = mvebu_pinctrl_find_setting_by_name(pctl, grp,
						     func->name);
	if (!setting) {
		dev_err(pctl->dev,
			"unable to find setting %s in group %s\n",
			func->name, func->groups[gid]);
		return -EINVAL;
	}

	config = setting->val;
	ret = mvebu_pinconf_group_set(pctldev, grp->gid, &config, 1);
	if (ret) {
		dev_err(pctl->dev, "cannot set group %s to %s\n",
			func->groups[gid], func->name);
		return ret;
	}

	return 0;
}

static int mvebu_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev,
			struct pinctrl_gpio_range *range, unsigned offset)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
	struct mvebu_pinctrl_group *grp;
	struct mvebu_mpp_ctrl_setting *setting;
	unsigned long config;

	grp = mvebu_pinctrl_find_group_by_pid(pctl, offset);
	if (!grp)
		return -EINVAL;

	if (grp->ctrl->mpp_gpio_req)
		return grp->ctrl->mpp_gpio_req(offset);

	setting = mvebu_pinctrl_find_gpio_setting(pctl, grp);
	if (!setting)
		return -ENOTSUPP;

	config = setting->val;

	return mvebu_pinconf_group_set(pctldev, grp->gid, &config, 1);
}

static int mvebu_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
	   struct pinctrl_gpio_range *range, unsigned offset, bool input)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
	struct mvebu_pinctrl_group *grp;
	struct mvebu_mpp_ctrl_setting *setting;

	grp = mvebu_pinctrl_find_group_by_pid(pctl, offset);
	if (!grp)
		return -EINVAL;

	if (grp->ctrl->mpp_gpio_dir)
		return grp->ctrl->mpp_gpio_dir(offset, input);

	setting = mvebu_pinctrl_find_gpio_setting(pctl, grp);
	if (!setting)
		return -ENOTSUPP;

	if ((input && (setting->flags & MVEBU_SETTING_GPI)) ||
	    (!input && (setting->flags & MVEBU_SETTING_GPO)))
		return 0;

	return -ENOTSUPP;
}

static const struct pinmux_ops mvebu_pinmux_ops = {
	.get_functions_count = mvebu_pinmux_get_funcs_count,
	.get_function_name = mvebu_pinmux_get_func_name,
	.get_function_groups = mvebu_pinmux_get_groups,
	.gpio_request_enable = mvebu_pinmux_gpio_request_enable,
	.gpio_set_direction = mvebu_pinmux_gpio_set_direction,
	.set_mux = mvebu_pinmux_set,
};

static int mvebu_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
	return pctl->num_groups;
}

static const char *mvebu_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
						unsigned gid)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
	return pctl->groups[gid].name;
}

static int mvebu_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
					unsigned gid, const unsigned **pins,
					unsigned *num_pins)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
	*pins = pctl->groups[gid].pins;
	*num_pins = pctl->groups[gid].npins;
	return 0;
}

static int mvebu_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
					struct device_node *np,
					struct pinctrl_map **map,
					unsigned *num_maps)
{
	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
	struct property *prop;
	const char *function;
	const char *group;
	int ret, nmaps, n;

	*map = NULL;
	*num_maps = 0;

	ret = of_property_read_string(np, "marvell,function", &function);
	if (ret) {
		dev_err(pctl->dev,
			"missing marvell,function in node %s\n", np->name);
		return 0;
	}

	nmaps = of_property_count_strings(np, "marvell,pins");
	if (nmaps < 0) {
		dev_err(pctl->dev,
			"missing marvell,pins in node %s\n", np->name);
		return 0;
	}

	*map = kmalloc(nmaps * sizeof(struct pinctrl_map), GFP_KERNEL);
	if (*map == NULL) {
		dev_err(pctl->dev,
			"cannot allocate pinctrl_map memory for %s\n",
			np->name);
		return -ENOMEM;
	}

	n = 0;
	of_property_for_each_string(np, "marvell,pins", prop, group) {
		struct mvebu_pinctrl_group *grp =
			mvebu_pinctrl_find_group_by_name(pctl, group);

		if (!grp) {
			dev_err(pctl->dev, "unknown pin %s", group);
			continue;
		}

		if (!mvebu_pinctrl_find_setting_by_name(pctl, grp, function)) {
			dev_err(pctl->dev, "unsupported function %s on pin %s",
				function, group);
			continue;
		}

		(*map)[n].type = PIN_MAP_TYPE_MUX_GROUP;
		(*map)[n].data.mux.group = group;
		(*map)[n].data.mux.function = function;
		n++;
	}

	*num_maps = nmaps;

	return 0;
}

static void mvebu_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
				struct pinctrl_map *map, unsigned num_maps)
{
	kfree(map);
}

static const struct pinctrl_ops mvebu_pinctrl_ops = {
	.get_groups_count = mvebu_pinctrl_get_groups_count,
	.get_group_name = mvebu_pinctrl_get_group_name,
	.get_group_pins = mvebu_pinctrl_get_group_pins,
	.dt_node_to_map = mvebu_pinctrl_dt_node_to_map,
	.dt_free_map = mvebu_pinctrl_dt_free_map,
};

static int _add_function(struct mvebu_pinctrl_function *funcs, int *funcsize,
			const char *name)
{
	if (*funcsize <= 0)
		return -EOVERFLOW;

	while (funcs->num_groups) {
		/* function already there */
		if (strcmp(funcs->name, name) == 0) {
			funcs->num_groups++;
			return -EEXIST;
		}
		funcs++;
	}

	/* append new unique function */
	funcs->name = name;
	funcs->num_groups = 1;
	(*funcsize)--;

	return 0;
}

static int mvebu_pinctrl_build_functions(struct platform_device *pdev,
					 struct mvebu_pinctrl *pctl)
{
	struct mvebu_pinctrl_function *funcs;
	int num = 0, funcsize = pctl->desc.npins;
	int n, s;

	/* we allocate functions for number of pins and hope
	 * there are fewer unique functions than pins available */
	funcs = devm_kzalloc(&pdev->dev, funcsize *
			     sizeof(struct mvebu_pinctrl_function), GFP_KERNEL);
	if (!funcs)
		return -ENOMEM;

	for (n = 0; n < pctl->num_groups; n++) {
		struct mvebu_pinctrl_group *grp = &pctl->groups[n];
		for (s = 0; s < grp->num_settings; s++) {
			int ret;

			/* skip unsupported settings on this variant */
			if (pctl->variant &&
			    !(pctl->variant & grp->settings[s].variant))
				continue;

			/* check for unique functions and count groups */
			ret = _add_function(funcs, &funcsize,
					    grp->settings[s].name);
			if (ret == -EOVERFLOW)
				dev_err(&pdev->dev,
					"More functions than pins(%d)\n",
					pctl->desc.npins);
			if (ret < 0)
				continue;

			num++;
		}
	}

	pctl->num_functions = num;
	pctl->functions = funcs;

	for (n = 0; n < pctl->num_groups; n++) {
		struct mvebu_pinctrl_group *grp = &pctl->groups[n];
		for (s = 0; s < grp->num_settings; s++) {
			struct mvebu_pinctrl_function *f;
			const char **groups;

			/* skip unsupported settings on this variant */
			if (pctl->variant &&
			    !(pctl->variant & grp->settings[s].variant))
				continue;

			f = mvebu_pinctrl_find_function_by_name(pctl,
							grp->settings[s].name);

			/* allocate group name array if not done already */
			if (!f->groups) {
				f->groups = devm_kzalloc(&pdev->dev,
						 f->num_groups * sizeof(char *),
						 GFP_KERNEL);
				if (!f->groups)
					return -ENOMEM;
			}

			/* find next free group name and assign current name */
			groups = f->groups;
			while (*groups)
				groups++;
			*groups = grp->name;
		}
	}

	return 0;
}

int mvebu_pinctrl_probe(struct platform_device *pdev)
{
	struct mvebu_pinctrl_soc_info *soc = dev_get_platdata(&pdev->dev);
	struct mvebu_pinctrl *pctl;
	struct pinctrl_pin_desc *pdesc;
	unsigned gid, n, k;
	unsigned size, noname = 0;
	char *noname_buf;
	void *p;
	int ret;

	if (!soc || !soc->controls || !soc->modes) {
		dev_err(&pdev->dev, "wrong pinctrl soc info\n");
		return -EINVAL;
	}

	pctl = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pinctrl),
			GFP_KERNEL);
	if (!pctl) {
		dev_err(&pdev->dev, "unable to alloc driver\n");
		return -ENOMEM;
	}

	pctl->desc.name = dev_name(&pdev->dev);
	pctl->desc.owner = THIS_MODULE;
	pctl->desc.pctlops = &mvebu_pinctrl_ops;
	pctl->desc.pmxops = &mvebu_pinmux_ops;
	pctl->desc.confops = &mvebu_pinconf_ops;
	pctl->variant = soc->variant;
	pctl->dev = &pdev->dev;
	platform_set_drvdata(pdev, pctl);

	/* count controls and create names for mvebu generic
	   register controls; also does sanity checks */
	pctl->num_groups = 0;
	pctl->desc.npins = 0;
	for (n = 0; n < soc->ncontrols; n++) {
		struct mvebu_mpp_ctrl *ctrl = &soc->controls[n];

		pctl->desc.npins += ctrl->npins;
		/* initialize control's pins[] array */
		for (k = 0; k < ctrl->npins; k++)
			ctrl->pins[k] = ctrl->pid + k;

		/*
		 * We allow to pass controls with NULL name that we treat
		 * as a range of one-pin groups with generic mvebu register
		 * controls.
		 */
		if (!ctrl->name) {
			pctl->num_groups += ctrl->npins;
			noname += ctrl->npins;
		} else {
			pctl->num_groups += 1;
		}
	}

	pdesc = devm_kzalloc(&pdev->dev, pctl->desc.npins *
			     sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
	if (!pdesc) {
		dev_err(&pdev->dev, "failed to alloc pinctrl pins\n");
		return -ENOMEM;
	}

	for (n = 0; n < pctl->desc.npins; n++)
		pdesc[n].number = n;
	pctl->desc.pins = pdesc;

	/*
	 * allocate groups and name buffers for unnamed groups.
	 */
	size = pctl->num_groups * sizeof(*pctl->groups) + noname * 8;
	p = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
	if (!p) {
		dev_err(&pdev->dev, "failed to alloc group data\n");
		return -ENOMEM;
	}
	pctl->groups = p;
	noname_buf = p + pctl->num_groups * sizeof(*pctl->groups);

	/* assign mpp controls to groups */
	gid = 0;
	for (n = 0; n < soc->ncontrols; n++) {
		struct mvebu_mpp_ctrl *ctrl = &soc->controls[n];
		pctl->groups[gid].gid = gid;
		pctl->groups[gid].ctrl = ctrl;
		pctl->groups[gid].name = ctrl->name;
		pctl->groups[gid].pins = ctrl->pins;
		pctl->groups[gid].npins = ctrl->npins;

		/*
		 * We treat unnamed controls as a range of one-pin groups
		 * with generic mvebu register controls. Use one group for
		 * each in this range and assign a default group name.
		 */
		if (!ctrl->name) {
			pctl->groups[gid].name = noname_buf;
			pctl->groups[gid].npins = 1;
			sprintf(noname_buf, "mpp%d", ctrl->pid+0);
			noname_buf += 8;

			for (k = 1; k < ctrl->npins; k++) {
				gid++;
				pctl->groups[gid].gid = gid;
				pctl->groups[gid].ctrl = ctrl;
				pctl->groups[gid].name = noname_buf;
				pctl->groups[gid].pins = &ctrl->pins[k];
				pctl->groups[gid].npins = 1;
				sprintf(noname_buf, "mpp%d", ctrl->pid+k);
				noname_buf += 8;
			}
		}
		gid++;
	}

	/* assign mpp modes to groups */
	for (n = 0; n < soc->nmodes; n++) {
		struct mvebu_mpp_mode *mode = &soc->modes[n];
		struct mvebu_pinctrl_group *grp =
			mvebu_pinctrl_find_group_by_pid(pctl, mode->pid);
		unsigned num_settings;

		if (!grp) {
			dev_warn(&pdev->dev, "unknown pinctrl group %d\n",
				mode->pid);
			continue;
		}

		for (num_settings = 0; ;) {
			struct mvebu_mpp_ctrl_setting *set =
				&mode->settings[num_settings];

			if (!set->name)
				break;
			num_settings++;

			/* skip unsupported settings for this variant */
			if (pctl->variant && !(pctl->variant & set->variant))
				continue;

			/* find gpio/gpo/gpi settings */
			if (strcmp(set->name, "gpio") == 0)
				set->flags = MVEBU_SETTING_GPI |
					MVEBU_SETTING_GPO;
			else if (strcmp(set->name, "gpo") == 0)
				set->flags = MVEBU_SETTING_GPO;
			else if (strcmp(set->name, "gpi") == 0)
				set->flags = MVEBU_SETTING_GPI;
		}

		grp->settings = mode->settings;
		grp->num_settings = num_settings;
	}

	ret = mvebu_pinctrl_build_functions(pdev, pctl);
	if (ret) {
		dev_err(&pdev->dev, "unable to build functions\n");
		return ret;
	}

	pctl->pctldev = pinctrl_register(&pctl->desc, &pdev->dev, pctl);
	if (IS_ERR(pctl->pctldev)) {
		dev_err(&pdev->dev, "unable to register pinctrl driver\n");
		return PTR_ERR(pctl->pctldev);
	}

	dev_info(&pdev->dev, "registered pinctrl driver\n");

	/* register gpio ranges */
	for (n = 0; n < soc->ngpioranges; n++)
		pinctrl_add_gpio_range(pctl->pctldev, &soc->gpioranges[n]);

	return 0;
}

int mvebu_pinctrl_remove(struct platform_device *pdev)
{
	struct mvebu_pinctrl *pctl = platform_get_drvdata(pdev);
	pinctrl_unregister(pctl->pctldev);
	return 0;
}