aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/pinctrl/pinctrl-tegra.c
blob: e767355ab0ad7a02fc5a1ff8cb62ad0cd943f698 (plain) (blame)
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
/*
 * Driver for the NVIDIA Tegra pinmux
 *
 * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
 *
 * Derived from code:
 * Copyright (C) 2010 Google, Inc.
 * Copyright (C) 2010 NVIDIA Corporation
 * Copyright (C) 2009-2011 ST-Ericsson AB
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/slab.h>

#include "core.h"
#include "pinctrl-tegra.h"
#include "pinctrl-utils.h"

struct tegra_pmx {
	struct device *dev;
	struct pinctrl_dev *pctl;

	const struct tegra_pinctrl_soc_data *soc;

	int nbanks;
	void __iomem **regs;
};

static inline u32 pmx_readl(struct tegra_pmx *pmx, u32 bank, u32 reg)
{
	return readl(pmx->regs[bank] + reg);
}

static inline void pmx_writel(struct tegra_pmx *pmx, u32 val, u32 bank, u32 reg)
{
	writel(val, pmx->regs[bank] + reg);
}

static int tegra_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
{
	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->soc->ngroups;
}

static const char *tegra_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
						unsigned group)
{
	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->soc->groups[group].name;
}

static int tegra_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
					unsigned group,
					const unsigned **pins,
					unsigned *num_pins)
{
	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	*pins = pmx->soc->groups[group].pins;
	*num_pins = pmx->soc->groups[group].npins;

	return 0;
}

#ifdef CONFIG_DEBUG_FS
static void tegra_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
				       struct seq_file *s,
				       unsigned offset)
{
	seq_printf(s, " %s", dev_name(pctldev->dev));
}
#endif

static const struct cfg_param {
	const char *property;
	enum tegra_pinconf_param param;
} cfg_params[] = {
	{"nvidia,pull",			TEGRA_PINCONF_PARAM_PULL},
	{"nvidia,tristate",		TEGRA_PINCONF_PARAM_TRISTATE},
	{"nvidia,enable-input",		TEGRA_PINCONF_PARAM_ENABLE_INPUT},
	{"nvidia,open-drain",		TEGRA_PINCONF_PARAM_OPEN_DRAIN},
	{"nvidia,lock",			TEGRA_PINCONF_PARAM_LOCK},
	{"nvidia,io-reset",		TEGRA_PINCONF_PARAM_IORESET},
	{"nvidia,rcv-sel",		TEGRA_PINCONF_PARAM_RCV_SEL},
	{"nvidia,high-speed-mode",	TEGRA_PINCONF_PARAM_HIGH_SPEED_MODE},
	{"nvidia,schmitt",		TEGRA_PINCONF_PARAM_SCHMITT},
	{"nvidia,low-power-mode",	TEGRA_PINCONF_PARAM_LOW_POWER_MODE},
	{"nvidia,pull-down-strength",	TEGRA_PINCONF_PARAM_DRIVE_DOWN_STRENGTH},
	{"nvidia,pull-up-strength",	TEGRA_PINCONF_PARAM_DRIVE_UP_STRENGTH},
	{"nvidia,slew-rate-falling",	TEGRA_PINCONF_PARAM_SLEW_RATE_FALLING},
	{"nvidia,slew-rate-rising",	TEGRA_PINCONF_PARAM_SLEW_RATE_RISING},
	{"nvidia,drive-type",		TEGRA_PINCONF_PARAM_DRIVE_TYPE},
};

static int tegra_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
					   struct device_node *np,
					   struct pinctrl_map **map,
					   unsigned *reserved_maps,
					   unsigned *num_maps)
{
	struct device *dev = pctldev->dev;
	int ret, i;
	const char *function;
	u32 val;
	unsigned long config;
	unsigned long *configs = NULL;
	unsigned num_configs = 0;
	unsigned reserve;
	struct property *prop;
	const char *group;

	ret = of_property_read_string(np, "nvidia,function", &function);
	if (ret < 0) {
		/* EINVAL=missing, which is fine since it's optional */
		if (ret != -EINVAL)
			dev_err(dev,
				"could not parse property nvidia,function\n");
		function = NULL;
	}

	for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
		ret = of_property_read_u32(np, cfg_params[i].property, &val);
		if (!ret) {
			config = TEGRA_PINCONF_PACK(cfg_params[i].param, val);
			ret = pinctrl_utils_add_config(pctldev, &configs,
					&num_configs, config);
			if (ret < 0)
				goto exit;
		/* EINVAL=missing, which is fine since it's optional */
		} else if (ret != -EINVAL) {
			dev_err(dev, "could not parse property %s\n",
				cfg_params[i].property);
		}
	}

	reserve = 0;
	if (function != NULL)
		reserve++;
	if (num_configs)
		reserve++;
	ret = of_property_count_strings(np, "nvidia,pins");
	if (ret < 0) {
		dev_err(dev, "could not parse property nvidia,pins\n");
		goto exit;
	}
	reserve *= ret;

	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
					num_maps, reserve);
	if (ret < 0)
		goto exit;

	of_property_for_each_string(np, "nvidia,pins", prop, group) {
		if (function) {
			ret = pinctrl_utils_add_map_mux(pctldev, map,
					reserved_maps, num_maps, group,
					function);
			if (ret < 0)
				goto exit;
		}

		if (num_configs) {
			ret = pinctrl_utils_add_map_configs(pctldev, map,
					reserved_maps, num_maps, group,
					configs, num_configs,
					PIN_MAP_TYPE_CONFIGS_GROUP);
			if (ret < 0)
				goto exit;
		}
	}

	ret = 0;

exit:
	kfree(configs);
	return ret;
}

static int tegra_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
					struct device_node *np_config,
					struct pinctrl_map **map,
					unsigned *num_maps)
{
	unsigned reserved_maps;
	struct device_node *np;
	int ret;

	reserved_maps = 0;
	*map = NULL;
	*num_maps = 0;

	for_each_child_of_node(np_config, np) {
		ret = tegra_pinctrl_dt_subnode_to_map(pctldev, np, map,
						      &reserved_maps, num_maps);
		if (ret < 0) {
			pinctrl_utils_dt_free_map(pctldev, *map,
				*num_maps);
			return ret;
		}
	}

	return 0;
}

static const struct pinctrl_ops tegra_pinctrl_ops = {
	.get_groups_count = tegra_pinctrl_get_groups_count,
	.get_group_name = tegra_pinctrl_get_group_name,
	.get_group_pins = tegra_pinctrl_get_group_pins,
#ifdef CONFIG_DEBUG_FS
	.pin_dbg_show = tegra_pinctrl_pin_dbg_show,
#endif
	.dt_node_to_map = tegra_pinctrl_dt_node_to_map,
	.dt_free_map = pinctrl_utils_dt_free_map,
};

static int tegra_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
{
	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->soc->nfunctions;
}

static const char *tegra_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
					       unsigned function)
{
	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->soc->functions[function].name;
}

static int tegra_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
					 unsigned function,
					 const char * const **groups,
					 unsigned * const num_groups)
{
	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	*groups = pmx->soc->functions[function].groups;
	*num_groups = pmx->soc->functions[function].ngroups;

	return 0;
}

static int tegra_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function,
			       unsigned group)
{
	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	const struct tegra_pingroup *g;
	int i;
	u32 val;

	g = &pmx->soc->groups[group];

	if (WARN_ON(g->mux_reg < 0))
		return -EINVAL;

	for (i = 0; i < ARRAY_SIZE(g->funcs); i++) {
		if (g->funcs[i] == function)
			break;
	}
	if (WARN_ON(i == ARRAY_SIZE(g->funcs)))
		return -EINVAL;

	val = pmx_readl(pmx, g->mux_bank, g->mux_reg);
	val &= ~(0x3 << g->mux_bit);
	val |= i << g->mux_bit;
	pmx_writel(pmx, val, g->mux_bank, g->mux_reg);

	return 0;
}

static void tegra_pinctrl_disable(struct pinctrl_dev *pctldev,
				  unsigned function, unsigned group)
{
	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	const struct tegra_pingroup *g;
	u32 val;

	g = &pmx->soc->groups[group];

	if (WARN_ON(g->mux_reg < 0))
		return;

	val = pmx_readl(pmx, g->mux_bank, g->mux_reg);
	val &= ~(0x3 << g->mux_bit);
	val |= g->func_safe << g->mux_bit;
	pmx_writel(pmx, val, g->mux_bank, g->mux_reg);
}

static const struct pinmux_ops tegra_pinmux_ops = {
	.get_functions_count = tegra_pinctrl_get_funcs_count,
	.get_function_name = tegra_pinctrl_get_func_name,
	.get_function_groups = tegra_pinctrl_get_func_groups,
	.enable = tegra_pinctrl_enable,
	.disable = tegra_pinctrl_disable,
};

static int tegra_pinconf_reg(struct tegra_pmx *pmx,
			     const struct tegra_pingroup *g,
			     enum tegra_pinconf_param param,
			     bool report_err,
			     s8 *bank, s16 *reg, s8 *bit, s8 *width)
{
	switch (param) {
	case TEGRA_PINCONF_PARAM_PULL:
		*bank = g->pupd_bank;
		*reg = g->pupd_reg;
		*bit = g->pupd_bit;
		*width = 2;
		break;
	case TEGRA_PINCONF_PARAM_TRISTATE:
		*bank = g->tri_bank;
		*reg = g->tri_reg;
		*bit = g->tri_bit;
		*width = 1;
		break;
	case TEGRA_PINCONF_PARAM_ENABLE_INPUT:
		*bank = g->einput_bank;
		*reg = g->einput_reg;
		*bit = g->einput_bit;
		*width = 1;
		break;
	case TEGRA_PINCONF_PARAM_OPEN_DRAIN:
		*bank = g->odrain_bank;
		*reg = g->odrain_reg;
		*bit = g->odrain_bit;
		*width = 1;
		break;
	case TEGRA_PINCONF_PARAM_LOCK:
		*bank = g->lock_bank;
		*reg = g->lock_reg;
		*bit = g->lock_bit;
		*width = 1;
		break;
	case TEGRA_PINCONF_PARAM_IORESET:
		*bank = g->ioreset_bank;
		*reg = g->ioreset_reg;
		*bit = g->ioreset_bit;
		*width = 1;
		break;
	case TEGRA_PINCONF_PARAM_RCV_SEL:
		*bank = g->rcv_sel_bank;
		*reg = g->rcv_sel_reg;
		*bit = g->rcv_sel_bit;
		*width = 1;
		break;
	case TEGRA_PINCONF_PARAM_HIGH_SPEED_MODE:
		*bank = g->drv_bank;
		*reg = g->drv_reg;
		*bit = g->hsm_bit;
		*width = 1;
		break;
	case TEGRA_PINCONF_PARAM_SCHMITT:
		*bank = g->drv_bank;
		*reg = g->drv_reg;
		*bit = g->schmitt_bit;
		*width = 1;
		break;
	case TEGRA_PINCONF_PARAM_LOW_POWER_MODE:
		*bank = g->drv_bank;
		*reg = g->drv_reg;
		*bit = g->lpmd_bit;
		*width = 2;
		break;
	case TEGRA_PINCONF_PARAM_DRIVE_DOWN_STRENGTH:
		*bank = g->drv_bank;
		*reg = g->drv_reg;
		*bit = g->drvdn_bit;
		*width = g->drvdn_width;
		break;
	case TEGRA_PINCONF_PARAM_DRIVE_UP_STRENGTH:
		*bank = g->drv_bank;
		*reg = g->drv_reg;
		*bit = g->drvup_bit;
		*width = g->drvup_width;
		break;
	case TEGRA_PINCONF_PARAM_SLEW_RATE_FALLING:
		*bank = g->drv_bank;
		*reg = g->drv_reg;
		*bit = g->slwf_bit;
		*width = g->slwf_width;
		break;
	case TEGRA_PINCONF_PARAM_SLEW_RATE_RISING:
		*bank = g->drv_bank;
		*reg = g->drv_reg;
		*bit = g->slwr_bit;
		*width = g->slwr_width;
		break;
	case TEGRA_PINCONF_PARAM_DRIVE_TYPE:
		*bank = g->drvtype_bank;
		*reg = g->drvtype_reg;
		*bit = g->drvtype_bit;
		*width = 2;
		break;
	default:
		dev_err(pmx->dev, "Invalid config param %04x\n", param);
		return -ENOTSUPP;
	}

	if (*reg < 0) {
		if (report_err)
			dev_err(pmx->dev,
				"Config param %04x not supported on group %s\n",
				param, g->name);
		return -ENOTSUPP;
	}

	return 0;
}

static int tegra_pinconf_get(struct pinctrl_dev *pctldev,
			     unsigned pin, unsigned long *config)
{
	dev_err(pctldev->dev, "pin_config_get op not supported\n");
	return -ENOTSUPP;
}

static int tegra_pinconf_set(struct pinctrl_dev *pctldev,
			     unsigned pin, unsigned long *configs,
			     unsigned num_configs)
{
	dev_err(pctldev->dev, "pin_config_set op not supported\n");
	return -ENOTSUPP;
}

static int tegra_pinconf_group_get(struct pinctrl_dev *pctldev,
				   unsigned group, unsigned long *config)
{
	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	enum tegra_pinconf_param param = TEGRA_PINCONF_UNPACK_PARAM(*config);
	u16 arg;
	const struct tegra_pingroup *g;
	int ret;
	s8 bank, bit, width;
	s16 reg;
	u32 val, mask;

	g = &pmx->soc->groups[group];

	ret = tegra_pinconf_reg(pmx, g, param, true, &bank, &reg, &bit,
				&width);
	if (ret < 0)
		return ret;

	val = pmx_readl(pmx, bank, reg);
	mask = (1 << width) - 1;
	arg = (val >> bit) & mask;

	*config = TEGRA_PINCONF_PACK(param, arg);

	return 0;
}

static int tegra_pinconf_group_set(struct pinctrl_dev *pctldev,
				   unsigned group, unsigned long *configs,
				   unsigned num_configs)
{
	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	enum tegra_pinconf_param param;
	u16 arg;
	const struct tegra_pingroup *g;
	int ret, i;
	s8 bank, bit, width;
	s16 reg;
	u32 val, mask;

	g = &pmx->soc->groups[group];

	for (i = 0; i < num_configs; i++) {
		param = TEGRA_PINCONF_UNPACK_PARAM(configs[i]);
		arg = TEGRA_PINCONF_UNPACK_ARG(configs[i]);

		ret = tegra_pinconf_reg(pmx, g, param, true, &bank, &reg, &bit,
					&width);
		if (ret < 0)
			return ret;

		val = pmx_readl(pmx, bank, reg);

		/* LOCK can't be cleared */
		if (param == TEGRA_PINCONF_PARAM_LOCK) {
			if ((val & BIT(bit)) && !arg) {
				dev_err(pctldev->dev, "LOCK bit cannot be cleared\n");
				return -EINVAL;
			}
		}

		/* Special-case Boolean values; allow any non-zero as true */
		if (width == 1)
			arg = !!arg;

		/* Range-check user-supplied value */
		mask = (1 << width) - 1;
		if (arg & ~mask) {
			dev_err(pctldev->dev,
				"config %lx: %x too big for %d bit register\n",
				configs[i], arg, width);
			return -EINVAL;
		}

		/* Update register */
		val &= ~(mask << bit);
		val |= arg << bit;
		pmx_writel(pmx, val, bank, reg);
	} /* for each config */

	return 0;
}

#ifdef CONFIG_DEBUG_FS
static void tegra_pinconf_dbg_show(struct pinctrl_dev *pctldev,
				   struct seq_file *s, unsigned offset)
{
}

static const char *strip_prefix(const char *s)
{
	const char *comma = strchr(s, ',');
	if (!comma)
		return s;

	return comma + 1;
}

static void tegra_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
					 struct seq_file *s, unsigned group)
{
	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	const struct tegra_pingroup *g;
	int i, ret;
	s8 bank, bit, width;
	s16 reg;
	u32 val;

	g = &pmx->soc->groups[group];

	for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
		ret = tegra_pinconf_reg(pmx, g, cfg_params[i].param, false,
					&bank, &reg, &bit, &width);
		if (ret < 0)
			continue;

		val = pmx_readl(pmx, bank, reg);
		val >>= bit;
		val &= (1 << width) - 1;

		seq_printf(s, "\n\t%s=%u",
			   strip_prefix(cfg_params[i].property), val);
	}
}

static void tegra_pinconf_config_dbg_show(struct pinctrl_dev *pctldev,
					  struct seq_file *s,
					  unsigned long config)
{
	enum tegra_pinconf_param param = TEGRA_PINCONF_UNPACK_PARAM(config);
	u16 arg = TEGRA_PINCONF_UNPACK_ARG(config);
	const char *pname = "unknown";
	int i;

	for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
		if (cfg_params[i].param == param) {
			pname = cfg_params[i].property;
			break;
		}
	}

	seq_printf(s, "%s=%d", strip_prefix(pname), arg);
}
#endif

static const struct pinconf_ops tegra_pinconf_ops = {
	.pin_config_get = tegra_pinconf_get,
	.pin_config_set = tegra_pinconf_set,
	.pin_config_group_get = tegra_pinconf_group_get,
	.pin_config_group_set = tegra_pinconf_group_set,
#ifdef CONFIG_DEBUG_FS
	.pin_config_dbg_show = tegra_pinconf_dbg_show,
	.pin_config_group_dbg_show = tegra_pinconf_group_dbg_show,
	.pin_config_config_dbg_show = tegra_pinconf_config_dbg_show,
#endif
};

static struct pinctrl_gpio_range tegra_pinctrl_gpio_range = {
	.name = "Tegra GPIOs",
	.id = 0,
	.base = 0,
};

static struct pinctrl_desc tegra_pinctrl_desc = {
	.pctlops = &tegra_pinctrl_ops,
	.pmxops = &tegra_pinmux_ops,
	.confops = &tegra_pinconf_ops,
	.owner = THIS_MODULE,
};

int tegra_pinctrl_probe(struct platform_device *pdev,
			const struct tegra_pinctrl_soc_data *soc_data)
{
	struct tegra_pmx *pmx;
	struct resource *res;
	int i;

	pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
	if (!pmx) {
		dev_err(&pdev->dev, "Can't alloc tegra_pmx\n");
		return -ENOMEM;
	}
	pmx->dev = &pdev->dev;
	pmx->soc = soc_data;

	tegra_pinctrl_gpio_range.npins = pmx->soc->ngpios;
	tegra_pinctrl_desc.name = dev_name(&pdev->dev);
	tegra_pinctrl_desc.pins = pmx->soc->pins;
	tegra_pinctrl_desc.npins = pmx->soc->npins;

	for (i = 0; ; i++) {
		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
		if (!res)
			break;
	}
	pmx->nbanks = i;

	pmx->regs = devm_kzalloc(&pdev->dev, pmx->nbanks * sizeof(*pmx->regs),
				 GFP_KERNEL);
	if (!pmx->regs) {
		dev_err(&pdev->dev, "Can't alloc regs pointer\n");
		return -ENOMEM;
	}

	for (i = 0; i < pmx->nbanks; i++) {
		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
		pmx->regs[i] = devm_ioremap_resource(&pdev->dev, res);
		if (IS_ERR(pmx->regs[i]))
			return PTR_ERR(pmx->regs[i]);
	}

	pmx->pctl = pinctrl_register(&tegra_pinctrl_desc, &pdev->dev, pmx);
	if (!pmx->pctl) {
		dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
		return -ENODEV;
	}

	pinctrl_add_gpio_range(pmx->pctl, &tegra_pinctrl_gpio_range);

	platform_set_drvdata(pdev, pmx);

	dev_dbg(&pdev->dev, "Probed Tegra pinctrl driver\n");

	return 0;
}
EXPORT_SYMBOL_GPL(tegra_pinctrl_probe);

int tegra_pinctrl_remove(struct platform_device *pdev)
{
	struct tegra_pmx *pmx = platform_get_drvdata(pdev);

	pinctrl_unregister(pmx->pctl);

	return 0;
}
EXPORT_SYMBOL_GPL(tegra_pinctrl_remove);