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[mirror_ubuntu-bionic-kernel.git] / drivers / gpio / gpio-tegra186.c
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5b2b135a
TR		 1/*
2 * Copyright (c) 2016-2017 NVIDIA Corporation
3 *
4 * Author: Thierry Reding <treding@nvidia.com>
5 *
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
9 */
10
11#include <linux/gpio/driver.h>
12#include <linux/interrupt.h>
13#include <linux/irq.h>
14#include <linux/module.h>
15#include <linux/of_device.h>
16#include <linux/platform_device.h>
17
18#include <dt-bindings/gpio/tegra186-gpio.h>
19
20#define TEGRA186_GPIO_ENABLE_CONFIG 0x00
21#define TEGRA186_GPIO_ENABLE_CONFIG_ENABLE BIT(0)
22#define TEGRA186_GPIO_ENABLE_CONFIG_OUT BIT(1)
23#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_NONE (0x0 << 2)
24#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_LEVEL (0x1 << 2)
25#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE (0x2 << 2)
26#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE (0x3 << 2)
27#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_MASK (0x3 << 2)
28#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL BIT(4)
29#define TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT BIT(6)
30
31#define TEGRA186_GPIO_DEBOUNCE_CONTROL 0x04
32#define TEGRA186_GPIO_DEBOUNCE_CONTROL_THRESHOLD(x) ((x) & 0xff)
33
34#define TEGRA186_GPIO_INPUT 0x08
35#define TEGRA186_GPIO_INPUT_HIGH BIT(0)
36
37#define TEGRA186_GPIO_OUTPUT_CONTROL 0x0c
38#define TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED BIT(0)
39
40#define TEGRA186_GPIO_OUTPUT_VALUE 0x10
41#define TEGRA186_GPIO_OUTPUT_VALUE_HIGH BIT(0)
42
43#define TEGRA186_GPIO_INTERRUPT_CLEAR 0x14
44
45#define TEGRA186_GPIO_INTERRUPT_STATUS(x) (0x100 + (x) * 4)
46
47struct tegra_gpio_port {
48 const char *name;
49 unsigned int offset;
50 unsigned int pins;
51 unsigned int irq;
52};
53
54struct tegra_gpio_soc {
55 const struct tegra_gpio_port *ports;
56 unsigned int num_ports;
57 const char *name;
58};
59
60struct tegra_gpio {
61 struct gpio_chip gpio;
62 struct irq_chip intc;
63 unsigned int num_irq;
64 unsigned int *irq;
65
66 const struct tegra_gpio_soc *soc;
67
68 void __iomem *base;
69};
70
71static const struct tegra_gpio_port *
72tegra186_gpio_get_port(struct tegra_gpio *gpio, unsigned int *pin)
73{
74 unsigned int start = 0, i;
75
76 for (i = 0; i < gpio->soc->num_ports; i++) {
77 const struct tegra_gpio_port *port = &gpio->soc->ports[i];
78
79 if (*pin >= start && *pin < start + port->pins) {
80 *pin -= start;
81 return port;
82 }
83
84 start += port->pins;
85 }
86
87 return NULL;
88}
89
90static void __iomem *tegra186_gpio_get_base(struct tegra_gpio *gpio,
91 unsigned int pin)
92{
93 const struct tegra_gpio_port *port;
94
95 port = tegra186_gpio_get_port(gpio, &pin);
96 if (!port)
97 return NULL;
98
99 return gpio->base + port->offset + pin * 0x20;
100}
101
102static int tegra186_gpio_get_direction(struct gpio_chip *chip,
103 unsigned int offset)
104{
105 struct tegra_gpio *gpio = gpiochip_get_data(chip);
106 void __iomem *base;
107 u32 value;
108
109 base = tegra186_gpio_get_base(gpio, offset);
110 if (WARN_ON(base == NULL))
111 return -ENODEV;
112
113 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
114 if (value & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
115 return 0;
116
117 return 1;
118}
119
120static int tegra186_gpio_direction_input(struct gpio_chip *chip,
121 unsigned int offset)
122{
123 struct tegra_gpio *gpio = gpiochip_get_data(chip);
124 void __iomem *base;
125 u32 value;
126
127 base = tegra186_gpio_get_base(gpio, offset);
128 if (WARN_ON(base == NULL))
129 return -ENODEV;
130
131 value = readl(base + TEGRA186_GPIO_OUTPUT_CONTROL);
132 value |= TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
133 writel(value, base + TEGRA186_GPIO_OUTPUT_CONTROL);
134
135 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
136 value |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
137 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_OUT;
138 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
139
140 return 0;
141}
142
143static int tegra186_gpio_direction_output(struct gpio_chip *chip,
144 unsigned int offset, int level)
145{
146 struct tegra_gpio *gpio = gpiochip_get_data(chip);
147 void __iomem *base;
148 u32 value;
149
150 /* configure output level first */
151 chip->set(chip, offset, level);
152
153 base = tegra186_gpio_get_base(gpio, offset);
154 if (WARN_ON(base == NULL))
155 return -EINVAL;
156
157 /* set the direction */
158 value = readl(base + TEGRA186_GPIO_OUTPUT_CONTROL);
159 value &= ~TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
160 writel(value, base + TEGRA186_GPIO_OUTPUT_CONTROL);
161
162 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
163 value |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
164 value |= TEGRA186_GPIO_ENABLE_CONFIG_OUT;
165 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
166
167 return 0;
168}
169
170static int tegra186_gpio_get(struct gpio_chip *chip, unsigned int offset)
171{
172 struct tegra_gpio *gpio = gpiochip_get_data(chip);
173 void __iomem *base;
174 u32 value;
175
176 base = tegra186_gpio_get_base(gpio, offset);
177 if (WARN_ON(base == NULL))
178 return -ENODEV;
179
180 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
181 if (value & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
182 value = readl(base + TEGRA186_GPIO_OUTPUT_VALUE);
183 else
184 value = readl(base + TEGRA186_GPIO_INPUT);
185
186 return value & BIT(0);
187}
188
189static void tegra186_gpio_set(struct gpio_chip *chip, unsigned int offset,
190 int level)
191{
192 struct tegra_gpio *gpio = gpiochip_get_data(chip);
193 void __iomem *base;
194 u32 value;
195
196 base = tegra186_gpio_get_base(gpio, offset);
197 if (WARN_ON(base == NULL))
198 return;
199
200 value = readl(base + TEGRA186_GPIO_OUTPUT_VALUE);
201 if (level == 0)
202 value &= ~TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
203 else
204 value |= TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
205
206 writel(value, base + TEGRA186_GPIO_OUTPUT_VALUE);
207}
208
209static int tegra186_gpio_of_xlate(struct gpio_chip *chip,
210 const struct of_phandle_args *spec,
211 u32 *flags)
212{
213 struct tegra_gpio *gpio = gpiochip_get_data(chip);
214 unsigned int port, pin, i, offset = 0;
215
216 if (WARN_ON(chip->of_gpio_n_cells < 2))
217 return -EINVAL;
218
219 if (WARN_ON(spec->args_count < chip->of_gpio_n_cells))
220 return -EINVAL;
221
222 port = spec->args[0] / 8;
223 pin = spec->args[0] % 8;
224
225 if (port >= gpio->soc->num_ports) {
226 dev_err(chip->parent, "invalid port number: %u\n", port);
227 return -EINVAL;
228 }
229
230 for (i = 0; i < port; i++)
231 offset += gpio->soc->ports[i].pins;
232
233 if (flags)
234 *flags = spec->args[1];
235
236 return offset + pin;
237}
238
239static void tegra186_irq_ack(struct irq_data *data)
240{
241 struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
242 void __iomem *base;
243
244 base = tegra186_gpio_get_base(gpio, data->hwirq);
245 if (WARN_ON(base == NULL))
246 return;
247
248 writel(1, base + TEGRA186_GPIO_INTERRUPT_CLEAR);
249}
250
251static void tegra186_irq_mask(struct irq_data *data)
252{
253 struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
254 void __iomem *base;
255 u32 value;
256
257 base = tegra186_gpio_get_base(gpio, data->hwirq);
258 if (WARN_ON(base == NULL))
259 return;
260
261 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
262 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT;
263 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
264}
265
266static void tegra186_irq_unmask(struct irq_data *data)
267{
268 struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
269 void __iomem *base;
270 u32 value;
271
272 base = tegra186_gpio_get_base(gpio, data->hwirq);
273 if (WARN_ON(base == NULL))
274 return;
275
276 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
277 value |= TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT;
278 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
279}
280
281static int tegra186_irq_set_type(struct irq_data *data, unsigned int flow)
282{
283 struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
284 void __iomem *base;
285 u32 value;
286
287 base = tegra186_gpio_get_base(gpio, data->hwirq);
288 if (WARN_ON(base == NULL))
289 return -ENODEV;
290
291 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
292 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_MASK;
293 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
294
295 switch (flow & IRQ_TYPE_SENSE_MASK) {
296 case IRQ_TYPE_NONE:
297 break;
298
299 case IRQ_TYPE_EDGE_RISING:
300 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
301 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
302 break;
303
304 case IRQ_TYPE_EDGE_FALLING:
305 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
306 break;
307
308 case IRQ_TYPE_EDGE_BOTH:
309 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE;
310 break;
311
312 case IRQ_TYPE_LEVEL_HIGH:
313 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_LEVEL;
314 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
315 break;
316
317 case IRQ_TYPE_LEVEL_LOW:
318 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_LEVEL;
319 break;
320
321 default:
322 return -EINVAL;
323 }
324
325 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
326
327 if ((flow & IRQ_TYPE_EDGE_BOTH) == 0)
328 irq_set_handler_locked(data, handle_level_irq);
329 else
330 irq_set_handler_locked(data, handle_edge_irq);
331
332 return 0;
333}
334
335static void tegra186_gpio_irq(struct irq_desc *desc)
336{
337 struct tegra_gpio *gpio = irq_desc_get_handler_data(desc);
338 struct irq_domain *domain = gpio->gpio.irq.domain;
339 struct irq_chip *chip = irq_desc_get_chip(desc);
340 unsigned int parent = irq_desc_get_irq(desc);
341 unsigned int i, offset = 0;
342
343 chained_irq_enter(chip, desc);
344
345 for (i = 0; i < gpio->soc->num_ports; i++) {
346 const struct tegra_gpio_port *port = &gpio->soc->ports[i];
347 void __iomem *base = gpio->base + port->offset;
348 unsigned int pin, irq;
349 unsigned long value;
350
351 /* skip ports that are not associated with this controller */
352 if (parent != gpio->irq[port->irq])
353 goto skip;
354
355 value = readl(base + TEGRA186_GPIO_INTERRUPT_STATUS(1));
356
357 for_each_set_bit(pin, &value, port->pins) {
358 irq = irq_find_mapping(domain, offset + pin);
359 if (WARN_ON(irq == 0))
360 continue;
361
362 generic_handle_irq(irq);
363 }
364
365skip:
366 offset += port->pins;
367 }
368
369 chained_irq_exit(chip, desc);
370}
371
372static int tegra186_gpio_irq_domain_xlate(struct irq_domain *domain,
373 struct device_node *np,
374 const u32 *spec, unsigned int size,
375 unsigned long *hwirq,
376 unsigned int *type)
377{
378 struct tegra_gpio *gpio = gpiochip_get_data(domain->host_data);
379 unsigned int port, pin, i, offset = 0;
380
381 if (size < 2)
382 return -EINVAL;
383
384 port = spec[0] / 8;
385 pin = spec[0] % 8;
386
387 if (port >= gpio->soc->num_ports) {
388 dev_err(gpio->gpio.parent, "invalid port number: %u\n", port);
389 return -EINVAL;
390 }
391
392 for (i = 0; i < port; i++)
393 offset += gpio->soc->ports[i].pins;
394
395 *type = spec[1] & IRQ_TYPE_SENSE_MASK;
396 *hwirq = offset + pin;
397
398 return 0;
399}
400
401static const struct irq_domain_ops tegra186_gpio_irq_domain_ops = {
402 .map = gpiochip_irq_map,
403 .unmap = gpiochip_irq_unmap,
404 .xlate = tegra186_gpio_irq_domain_xlate,
405};
406
5b2b135a
TR		 407static int tegra186_gpio_probe(struct platform_device *pdev)
408{
409 unsigned int i, j, offset;
410 struct gpio_irq_chip *irq;
411 struct tegra_gpio *gpio;
412 struct resource *res;
413 char **names;
414 int err;
415
416 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
417 if (!gpio)
418 return -ENOMEM;
419
420 gpio->soc = of_device_get_match_data(&pdev->dev);
421
422 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gpio");
423 gpio->base = devm_ioremap_resource(&pdev->dev, res);
424 if (IS_ERR(gpio->base))
425 return PTR_ERR(gpio->base);
426
427 err = platform_irq_count(pdev);
428 if (err < 0)
429 return err;
430
431 gpio->num_irq = err;
432
433 gpio->irq = devm_kcalloc(&pdev->dev, gpio->num_irq, sizeof(*gpio->irq),
434 GFP_KERNEL);
435 if (!gpio->irq)
436 return -ENOMEM;
437
438 for (i = 0; i < gpio->num_irq; i++) {
439 err = platform_get_irq(pdev, i);
440 if (err < 0)
441 return err;
442
443 gpio->irq[i] = err;
444 }
445
446 gpio->gpio.label = gpio->soc->name;
447 gpio->gpio.parent = &pdev->dev;
448
449 gpio->gpio.get_direction = tegra186_gpio_get_direction;
450 gpio->gpio.direction_input = tegra186_gpio_direction_input;
451 gpio->gpio.direction_output = tegra186_gpio_direction_output;
452 gpio->gpio.get = tegra186_gpio_get,
453 gpio->gpio.set = tegra186_gpio_set;
454
455 gpio->gpio.base = -1;
456
457 for (i = 0; i < gpio->soc->num_ports; i++)
458 gpio->gpio.ngpio += gpio->soc->ports[i].pins;
459
460 names = devm_kcalloc(gpio->gpio.parent, gpio->gpio.ngpio,
461 sizeof(*names), GFP_KERNEL);
462 if (!names)
463 return -ENOMEM;
464
465 for (i = 0, offset = 0; i < gpio->soc->num_ports; i++) {
466 const struct tegra_gpio_port *port = &gpio->soc->ports[i];
467 char *name;
468
469 for (j = 0; j < port->pins; j++) {
470 name = devm_kasprintf(gpio->gpio.parent, GFP_KERNEL,
471 "P%s.%02x", port->name, j);
472 if (!name)
473 return -ENOMEM;
474
475 names[offset + j] = name;
476 }
477
478 offset += port->pins;
479 }
480
481 gpio->gpio.names = (const char * const *)names;
482
483 gpio->gpio.of_node = pdev->dev.of_node;
484 gpio->gpio.of_gpio_n_cells = 2;
485 gpio->gpio.of_xlate = tegra186_gpio_of_xlate;
486
487 gpio->intc.name = pdev->dev.of_node->name;
488 gpio->intc.irq_ack = tegra186_irq_ack;
489 gpio->intc.irq_mask = tegra186_irq_mask;
490 gpio->intc.irq_unmask = tegra186_irq_unmask;
491 gpio->intc.irq_set_type = tegra186_irq_set_type;
492
493 irq = &gpio->gpio.irq;
494 irq->chip = &gpio->intc;
495 irq->domain_ops = &tegra186_gpio_irq_domain_ops;
496 irq->handler = handle_simple_irq;
5b2b135a
TR		 497 irq->default_type = IRQ_TYPE_NONE;
498 irq->parent_handler = tegra186_gpio_irq;
499 irq->parent_handler_data = gpio;
500 irq->num_parents = gpio->num_irq;
501 irq->parents = gpio->irq;
502
503 irq->map = devm_kcalloc(&pdev->dev, gpio->gpio.ngpio,
504 sizeof(*irq->map), GFP_KERNEL);
505 if (!irq->map)
506 return -ENOMEM;
507
508 for (i = 0, offset = 0; i < gpio->soc->num_ports; i++) {
509 const struct tegra_gpio_port *port = &gpio->soc->ports[i];
510
511 for (j = 0; j < port->pins; j++)
512 irq->map[offset + j] = irq->parents[port->irq];
513
514 offset += port->pins;
515 }
516
517 platform_set_drvdata(pdev, gpio);
518
519 err = devm_gpiochip_add_data(&pdev->dev, &gpio->gpio, gpio);
520 if (err < 0)
521 return err;
522
523 return 0;
524}
525
526static int tegra186_gpio_remove(struct platform_device *pdev)
527{
528 return 0;
529}
530
531#define TEGRA_MAIN_GPIO_PORT(port, base, count, controller) \
532 [TEGRA_MAIN_GPIO_PORT_##port] = { \
533 .name = #port, \
534 .offset = base, \
535 .pins = count, \
536 .irq = controller, \
537 }
538
539static const struct tegra_gpio_port tegra186_main_ports[] = {
540 TEGRA_MAIN_GPIO_PORT( A, 0x2000, 7, 2),
541 TEGRA_MAIN_GPIO_PORT( B, 0x3000, 7, 3),
542 TEGRA_MAIN_GPIO_PORT( C, 0x3200, 7, 3),
543 TEGRA_MAIN_GPIO_PORT( D, 0x3400, 6, 3),
544 TEGRA_MAIN_GPIO_PORT( E, 0x2200, 8, 2),
545 TEGRA_MAIN_GPIO_PORT( F, 0x2400, 6, 2),
546 TEGRA_MAIN_GPIO_PORT( G, 0x4200, 6, 4),
547 TEGRA_MAIN_GPIO_PORT( H, 0x1000, 7, 1),
548 TEGRA_MAIN_GPIO_PORT( I, 0x0800, 8, 0),
549 TEGRA_MAIN_GPIO_PORT( J, 0x5000, 8, 5),
550 TEGRA_MAIN_GPIO_PORT( K, 0x5200, 1, 5),
551 TEGRA_MAIN_GPIO_PORT( L, 0x1200, 8, 1),
552 TEGRA_MAIN_GPIO_PORT( M, 0x5600, 6, 5),
553 TEGRA_MAIN_GPIO_PORT( N, 0x0000, 7, 0),
554 TEGRA_MAIN_GPIO_PORT( O, 0x0200, 4, 0),
555 TEGRA_MAIN_GPIO_PORT( P, 0x4000, 7, 4),
556 TEGRA_MAIN_GPIO_PORT( Q, 0x0400, 6, 0),
557 TEGRA_MAIN_GPIO_PORT( R, 0x0a00, 6, 0),
558 TEGRA_MAIN_GPIO_PORT( T, 0x0600, 4, 0),
559 TEGRA_MAIN_GPIO_PORT( X, 0x1400, 8, 1),
560 TEGRA_MAIN_GPIO_PORT( Y, 0x1600, 7, 1),
561 TEGRA_MAIN_GPIO_PORT(BB, 0x2600, 2, 2),
562 TEGRA_MAIN_GPIO_PORT(CC, 0x5400, 4, 5),
563};
564
565static const struct tegra_gpio_soc tegra186_main_soc = {
566 .num_ports = ARRAY_SIZE(tegra186_main_ports),
567 .ports = tegra186_main_ports,
568 .name = "tegra186-gpio",
569};
570
571#define TEGRA_AON_GPIO_PORT(port, base, count, controller) \
572 [TEGRA_AON_GPIO_PORT_##port] = { \
573 .name = #port, \
574 .offset = base, \
575 .pins = count, \
576 .irq = controller, \
577 }
578
579static const struct tegra_gpio_port tegra186_aon_ports[] = {
580 TEGRA_AON_GPIO_PORT( S, 0x0200, 5, 0),
581 TEGRA_AON_GPIO_PORT( U, 0x0400, 6, 0),
582 TEGRA_AON_GPIO_PORT( V, 0x0800, 8, 0),
583 TEGRA_AON_GPIO_PORT( W, 0x0a00, 8, 0),
584 TEGRA_AON_GPIO_PORT( Z, 0x0e00, 4, 0),
585 TEGRA_AON_GPIO_PORT(AA, 0x0c00, 8, 0),
586 TEGRA_AON_GPIO_PORT(EE, 0x0600, 3, 0),
587 TEGRA_AON_GPIO_PORT(FF, 0x0000, 5, 0),
588};
589
590static const struct tegra_gpio_soc tegra186_aon_soc = {
591 .num_ports = ARRAY_SIZE(tegra186_aon_ports),
592 .ports = tegra186_aon_ports,
593 .name = "tegra186-gpio-aon",
594};
595
596static const struct of_device_id tegra186_gpio_of_match[] = {
597 {
598 .compatible = "nvidia,tegra186-gpio",
599 .data = &tegra186_main_soc
600 }, {
601 .compatible = "nvidia,tegra186-gpio-aon",
602 .data = &tegra186_aon_soc
603 }, {
604 /* sentinel */
605 }
606};
607
608static struct platform_driver tegra186_gpio_driver = {
609 .driver = {
610 .name = "tegra186-gpio",
611 .of_match_table = tegra186_gpio_of_match,
612 },
613 .probe = tegra186_gpio_probe,
614 .remove = tegra186_gpio_remove,
615};
616module_platform_driver(tegra186_gpio_driver);
617
618MODULE_DESCRIPTION("NVIDIA Tegra186 GPIO controller driver");
619MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
620MODULE_LICENSE("GPL v2");
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