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Anton Vorontsov863fbf42008-04-11 23:06:45 +10001/*
2 * OF helpers for the GPIO API
3 *
4 * Copyright (c) 2007-2008 MontaVista Software, Inc.
5 *
6 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
Grant Likely2e13cba2010-07-05 16:11:55 -060014#include <linux/device.h>
Sachin Kamatbea4dbe2014-01-27 12:15:08 +053015#include <linux/err.h>
Anton Vorontsov863fbf42008-04-11 23:06:45 +100016#include <linux/errno.h>
Grant Likely2e13cba2010-07-05 16:11:55 -060017#include <linux/module.h>
Anton Vorontsov863fbf42008-04-11 23:06:45 +100018#include <linux/io.h>
Alexandre Courbotaf8b6372013-10-17 10:21:37 -070019#include <linux/gpio/consumer.h>
Anton Vorontsov863fbf42008-04-11 23:06:45 +100020#include <linux/of.h>
Grant Likely2e13cba2010-07-05 16:11:55 -060021#include <linux/of_address.h>
Anton Vorontsov863fbf42008-04-11 23:06:45 +100022#include <linux/of_gpio.h>
Shiraz Hashimf23f1512012-10-27 15:21:36 +053023#include <linux/pinctrl/pinctrl.h>
Grant Likely2e13cba2010-07-05 16:11:55 -060024#include <linux/slab.h>
Benoit Parrotf625d462015-02-02 11:44:44 -060025#include <linux/gpio/machine.h>
Anton Vorontsov863fbf42008-04-11 23:06:45 +100026
Alexandre Courbot1bd6b602014-07-22 16:17:41 +090027#include "gpiolib.h"
Alexandre Courbotaf8b6372013-10-17 10:21:37 -070028
Dong Aisheng0df2c992012-05-25 21:36:15 +080029/* Private data structure for of_gpiochip_find_and_xlate */
Grant Likely3d0f7cf2012-05-17 13:54:40 -060030struct gg_data {
31 enum of_gpio_flags *flags;
32 struct of_phandle_args gpiospec;
33
Alexandre Courbotaf8b6372013-10-17 10:21:37 -070034 struct gpio_desc *out_gpio;
Grant Likely3d0f7cf2012-05-17 13:54:40 -060035};
36
37/* Private function for resolving node pointer to gpio_chip */
38static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
39{
40 struct gg_data *gg_data = data;
41 int ret;
42
43 if ((gc->of_node != gg_data->gpiospec.np) ||
44 (gc->of_gpio_n_cells != gg_data->gpiospec.args_count) ||
45 (!gc->of_xlate))
46 return false;
47
48 ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags);
Hans Holmberg7b8792b2015-01-09 09:40:43 +010049 if (ret < 0) {
Hans Holmberg9cf75e92015-02-10 09:48:27 +010050 /* We've found a gpio chip, but the translation failed.
51 * Store translation error in out_gpio.
52 * Return false to keep looking, as more than one gpio chip
53 * could be registered per of-node.
Hans Holmberg7b8792b2015-01-09 09:40:43 +010054 */
55 gg_data->out_gpio = ERR_PTR(ret);
Hans Holmberg9cf75e92015-02-10 09:48:27 +010056 return false;
Hans Holmberg7b8792b2015-01-09 09:40:43 +010057 }
Grant Likely3d0f7cf2012-05-17 13:54:40 -060058
Linus Walleijccd97262014-04-22 14:38:21 +020059 gg_data->out_gpio = gpiochip_get_desc(gc, ret);
Grant Likely3d0f7cf2012-05-17 13:54:40 -060060 return true;
61}
62
Anton Vorontsov863fbf42008-04-11 23:06:45 +100063/**
Alexandre Courbotaf8b6372013-10-17 10:21:37 -070064 * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
Anton Vorontsov863fbf42008-04-11 23:06:45 +100065 * @np: device node to get GPIO from
John Bonesioa6b09192011-06-27 16:49:57 -070066 * @propname: property name containing gpio specifier(s)
Anton Vorontsov863fbf42008-04-11 23:06:45 +100067 * @index: index of the GPIO
Anton Vorontsovb908b532008-12-01 06:30:04 +000068 * @flags: a flags pointer to fill in
Anton Vorontsov863fbf42008-04-11 23:06:45 +100069 *
Alexandre Courbotaf8b6372013-10-17 10:21:37 -070070 * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
Anton Vorontsovb908b532008-12-01 06:30:04 +000071 * value on the error condition. If @flags is not NULL the function also fills
72 * in flags for the GPIO.
Anton Vorontsov863fbf42008-04-11 23:06:45 +100073 */
Alexandre Courbotaf8b6372013-10-17 10:21:37 -070074struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
75 const char *propname, int index, enum of_gpio_flags *flags)
Anton Vorontsov863fbf42008-04-11 23:06:45 +100076{
Roland Stigge4fbb0022012-06-28 00:32:14 +020077 /* Return -EPROBE_DEFER to support probe() functions to be called
78 * later when the GPIO actually becomes available
79 */
Alexandre Courbotaf8b6372013-10-17 10:21:37 -070080 struct gg_data gg_data = {
81 .flags = flags,
82 .out_gpio = ERR_PTR(-EPROBE_DEFER)
83 };
Anton Vorontsov64b60e02008-10-10 04:43:17 +000084 int ret;
Anton Vorontsov863fbf42008-04-11 23:06:45 +100085
Grant Likely3d0f7cf2012-05-17 13:54:40 -060086 /* .of_xlate might decide to not fill in the flags, so clear it. */
Anton Vorontsovb908b532008-12-01 06:30:04 +000087 if (flags)
88 *flags = 0;
89
Grant Likely3d0f7cf2012-05-17 13:54:40 -060090 ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
91 &gg_data.gpiospec);
92 if (ret) {
Tushar Behera85ea29a2014-07-04 15:22:09 +053093 pr_debug("%s: can't parse '%s' property of node '%s[%d]'\n",
94 __func__, propname, np->full_name, index);
Alexandre Courbotaf8b6372013-10-17 10:21:37 -070095 return ERR_PTR(ret);
Grant Likely3d0f7cf2012-05-17 13:54:40 -060096 }
Anton Vorontsov863fbf42008-04-11 23:06:45 +100097
Grant Likely3d0f7cf2012-05-17 13:54:40 -060098 gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
99
100 of_node_put(gg_data.gpiospec.np);
Tushar Behera85ea29a2014-07-04 15:22:09 +0530101 pr_debug("%s: parsed '%s' property of node '%s[%d]' - status (%d)\n",
102 __func__, propname, np->full_name, index,
Sachin Kamatbea4dbe2014-01-27 12:15:08 +0530103 PTR_ERR_OR_ZERO(gg_data.out_gpio));
Grant Likely3d0f7cf2012-05-17 13:54:40 -0600104 return gg_data.out_gpio;
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000105}
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000106
Alexandre Courbotf01d9072014-05-17 14:54:50 +0900107int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
108 int index, enum of_gpio_flags *flags)
109{
110 struct gpio_desc *desc;
111
112 desc = of_get_named_gpiod_flags(np, list_name, index, flags);
113
114 if (IS_ERR(desc))
115 return PTR_ERR(desc);
116 else
117 return desc_to_gpio(desc);
118}
119EXPORT_SYMBOL(of_get_named_gpio_flags);
120
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000121/**
Markus Pargmannfd7337f2015-08-14 16:10:58 +0200122 * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API
Benoit Parrotf625d462015-02-02 11:44:44 -0600123 * @np: device node to get GPIO from
124 * @name: GPIO line name
125 * @lflags: gpio_lookup_flags - returned from of_find_gpio() or
Markus Pargmannfd7337f2015-08-14 16:10:58 +0200126 * of_parse_own_gpio()
Benoit Parrotf625d462015-02-02 11:44:44 -0600127 * @dflags: gpiod_flags - optional GPIO initialization flags
128 *
129 * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
130 * value on the error condition.
131 */
Markus Pargmannfd7337f2015-08-14 16:10:58 +0200132static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
133 const char **name,
134 enum gpio_lookup_flags *lflags,
135 enum gpiod_flags *dflags)
Benoit Parrotf625d462015-02-02 11:44:44 -0600136{
137 struct device_node *chip_np;
138 enum of_gpio_flags xlate_flags;
Benoit Parrotf625d462015-02-02 11:44:44 -0600139 struct gg_data gg_data = {
140 .flags = &xlate_flags,
141 };
142 u32 tmp;
143 int i, ret;
144
145 chip_np = np->parent;
146 if (!chip_np)
147 return ERR_PTR(-EINVAL);
148
149 xlate_flags = 0;
150 *lflags = 0;
151 *dflags = 0;
152
153 ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp);
154 if (ret)
155 return ERR_PTR(ret);
156
157 if (tmp > MAX_PHANDLE_ARGS)
158 return ERR_PTR(-EINVAL);
159
160 gg_data.gpiospec.args_count = tmp;
161 gg_data.gpiospec.np = chip_np;
162 for (i = 0; i < tmp; i++) {
163 ret = of_property_read_u32_index(np, "gpios", i,
164 &gg_data.gpiospec.args[i]);
165 if (ret)
166 return ERR_PTR(ret);
167 }
168
169 gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
170 if (!gg_data.out_gpio) {
171 if (np->parent == np)
172 return ERR_PTR(-ENXIO);
173 else
174 return ERR_PTR(-EINVAL);
175 }
176
177 if (xlate_flags & OF_GPIO_ACTIVE_LOW)
178 *lflags |= GPIO_ACTIVE_LOW;
179
180 if (of_property_read_bool(np, "input"))
181 *dflags |= GPIOD_IN;
182 else if (of_property_read_bool(np, "output-low"))
183 *dflags |= GPIOD_OUT_LOW;
184 else if (of_property_read_bool(np, "output-high"))
185 *dflags |= GPIOD_OUT_HIGH;
186 else {
187 pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n",
188 desc_to_gpio(gg_data.out_gpio), np->name);
189 return ERR_PTR(-EINVAL);
190 }
191
192 if (name && of_property_read_string(np, "line-name", name))
193 *name = np->name;
194
Masahiro Yamada39561e82015-07-14 10:01:44 +0900195 return gg_data.out_gpio;
Benoit Parrotf625d462015-02-02 11:44:44 -0600196}
197
198/**
Markus Pargmannfd7337f2015-08-14 16:10:58 +0200199 * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions
Benoit Parrotf625d462015-02-02 11:44:44 -0600200 * @chip: gpio chip to act on
201 *
202 * This is only used by of_gpiochip_add to request/set GPIO initial
203 * configuration.
204 */
Markus Pargmannfd7337f2015-08-14 16:10:58 +0200205static void of_gpiochip_scan_gpios(struct gpio_chip *chip)
Benoit Parrotf625d462015-02-02 11:44:44 -0600206{
207 struct gpio_desc *desc = NULL;
208 struct device_node *np;
209 const char *name;
210 enum gpio_lookup_flags lflags;
211 enum gpiod_flags dflags;
212
213 for_each_child_of_node(chip->of_node, np) {
214 if (!of_property_read_bool(np, "gpio-hog"))
215 continue;
216
Markus Pargmannfd7337f2015-08-14 16:10:58 +0200217 desc = of_parse_own_gpio(np, &name, &lflags, &dflags);
Benoit Parrotf625d462015-02-02 11:44:44 -0600218 if (IS_ERR(desc))
219 continue;
220
221 if (gpiod_hog(desc, name, lflags, dflags))
222 continue;
223 }
224}
225
226/**
Anton Vorontsovb908b532008-12-01 06:30:04 +0000227 * of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags
Anton Vorontsova19e3da2010-06-08 07:48:16 -0600228 * @gc: pointer to the gpio_chip structure
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000229 * @np: device node of the GPIO chip
230 * @gpio_spec: gpio specifier as found in the device tree
Anton Vorontsovb908b532008-12-01 06:30:04 +0000231 * @flags: a flags pointer to fill in
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000232 *
233 * This is simple translation function, suitable for the most 1:1 mapped
234 * gpio chips. This function performs only one sanity check: whether gpio
235 * is less than ngpios (that is specified in the gpio_chip).
236 */
Grant Likely15c9a0a2011-12-12 09:25:57 -0700237int of_gpio_simple_xlate(struct gpio_chip *gc,
238 const struct of_phandle_args *gpiospec, u32 *flags)
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000239{
Anton Vorontsovb908b532008-12-01 06:30:04 +0000240 /*
241 * We're discouraging gpio_cells < 2, since that way you'll have to
Colin Cronin20a8a962015-05-18 11:41:43 -0700242 * write your own xlate function (that will have to retrieve the GPIO
Anton Vorontsovb908b532008-12-01 06:30:04 +0000243 * number and the flags from a single gpio cell -- this is possible,
244 * but not recommended).
245 */
Anton Vorontsova19e3da2010-06-08 07:48:16 -0600246 if (gc->of_gpio_n_cells < 2) {
Anton Vorontsovb908b532008-12-01 06:30:04 +0000247 WARN_ON(1);
248 return -EINVAL;
249 }
250
Grant Likely15c9a0a2011-12-12 09:25:57 -0700251 if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
252 return -EINVAL;
253
Roland Stigge6270d832012-04-04 02:02:58 +0200254 if (gpiospec->args[0] >= gc->ngpio)
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000255 return -EINVAL;
256
Anton Vorontsovb908b532008-12-01 06:30:04 +0000257 if (flags)
Grant Likely15c9a0a2011-12-12 09:25:57 -0700258 *flags = gpiospec->args[1];
Anton Vorontsovb908b532008-12-01 06:30:04 +0000259
Grant Likely15c9a0a2011-12-12 09:25:57 -0700260 return gpiospec->args[0];
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000261}
Jamie Iles3038bbd2011-07-28 16:25:41 +0100262EXPORT_SYMBOL(of_gpio_simple_xlate);
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000263
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000264/**
265 * of_mm_gpiochip_add - Add memory mapped GPIO chip (bank)
266 * @np: device node of the GPIO chip
267 * @mm_gc: pointer to the of_mm_gpio_chip allocated structure
268 *
269 * To use this function you should allocate and fill mm_gc with:
270 *
271 * 1) In the gpio_chip structure:
272 * - all the callbacks
Anton Vorontsova19e3da2010-06-08 07:48:16 -0600273 * - of_gpio_n_cells
274 * - of_xlate callback (optional)
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000275 *
276 * 3) In the of_mm_gpio_chip structure:
277 * - save_regs callback (optional)
278 *
279 * If succeeded, this function will map bank's memory and will
280 * do all necessary work for you. Then you'll able to use .regs
281 * to manage GPIOs from the callbacks.
282 */
283int of_mm_gpiochip_add(struct device_node *np,
284 struct of_mm_gpio_chip *mm_gc)
285{
286 int ret = -ENOMEM;
Anton Vorontsova19e3da2010-06-08 07:48:16 -0600287 struct gpio_chip *gc = &mm_gc->gc;
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000288
289 gc->label = kstrdup(np->full_name, GFP_KERNEL);
290 if (!gc->label)
291 goto err0;
292
293 mm_gc->regs = of_iomap(np, 0);
294 if (!mm_gc->regs)
295 goto err1;
296
Anton Vorontsov21451152008-04-30 00:05:24 +1000297 gc->base = -1;
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000298
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000299 if (mm_gc->save_regs)
300 mm_gc->save_regs(mm_gc);
301
Anton Vorontsova19e3da2010-06-08 07:48:16 -0600302 mm_gc->gc.of_node = np;
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000303
304 ret = gpiochip_add(gc);
305 if (ret)
306 goto err2;
307
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000308 return 0;
309err2:
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000310 iounmap(mm_gc->regs);
311err1:
312 kfree(gc->label);
313err0:
314 pr_err("%s: GPIO chip registration failed with status %d\n",
315 np->full_name, ret);
316 return ret;
317}
318EXPORT_SYMBOL(of_mm_gpiochip_add);
Grant Likely594fa262010-06-08 07:48:16 -0600319
Ricardo Ribalda Delgadod621e8b2014-12-17 16:51:13 +0100320/**
321 * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank)
322 * @mm_gc: pointer to the of_mm_gpio_chip allocated structure
323 */
324void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc)
325{
326 struct gpio_chip *gc = &mm_gc->gc;
327
328 if (!mm_gc)
329 return;
330
331 gpiochip_remove(gc);
332 iounmap(mm_gc->regs);
333 kfree(gc->label);
334}
335EXPORT_SYMBOL(of_mm_gpiochip_remove);
336
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530337#ifdef CONFIG_PINCTRL
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200338static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530339{
340 struct device_node *np = chip->of_node;
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530341 struct of_phandle_args pinspec;
Linus Walleij1e63d7b2012-11-06 16:03:35 +0100342 struct pinctrl_dev *pctldev;
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530343 int index = 0, ret;
Christian Ruppert586a87e2013-10-15 15:37:54 +0200344 const char *name;
345 static const char group_names_propname[] = "gpio-ranges-group-names";
346 struct property *group_names;
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530347
348 if (!np)
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200349 return 0;
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530350
Christian Ruppert586a87e2013-10-15 15:37:54 +0200351 group_names = of_find_property(np, group_names_propname, NULL);
352
Haojian Zhuangad4e1a72013-02-17 19:42:48 +0800353 for (;; index++) {
Stephen Warrend9fe0032013-08-14 15:27:12 -0600354 ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
355 index, &pinspec);
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530356 if (ret)
357 break;
358
Linus Walleij1e63d7b2012-11-06 16:03:35 +0100359 pctldev = of_pinctrl_get(pinspec.np);
360 if (!pctldev)
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200361 return -EPROBE_DEFER;
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530362
Christian Ruppert586a87e2013-10-15 15:37:54 +0200363 if (pinspec.args[2]) {
364 if (group_names) {
Laurent Navet72858602015-07-07 22:22:15 +0200365 of_property_read_string_index(np,
Christian Ruppert586a87e2013-10-15 15:37:54 +0200366 group_names_propname,
367 index, &name);
368 if (strlen(name)) {
369 pr_err("%s: Group name of numeric GPIO ranges must be the empty string.\n",
370 np->full_name);
371 break;
372 }
373 }
374 /* npins != 0: linear range */
375 ret = gpiochip_add_pin_range(chip,
376 pinctrl_dev_get_devname(pctldev),
377 pinspec.args[0],
378 pinspec.args[1],
379 pinspec.args[2]);
380 if (ret)
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200381 return ret;
Christian Ruppert586a87e2013-10-15 15:37:54 +0200382 } else {
383 /* npins == 0: special range */
384 if (pinspec.args[1]) {
385 pr_err("%s: Illegal gpio-range format.\n",
386 np->full_name);
387 break;
388 }
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530389
Christian Ruppert586a87e2013-10-15 15:37:54 +0200390 if (!group_names) {
391 pr_err("%s: GPIO group range requested but no %s property.\n",
392 np->full_name, group_names_propname);
393 break;
394 }
395
396 ret = of_property_read_string_index(np,
397 group_names_propname,
398 index, &name);
399 if (ret)
400 break;
401
402 if (!strlen(name)) {
403 pr_err("%s: Group name of GPIO group range cannot be the empty string.\n",
404 np->full_name);
405 break;
406 }
407
408 ret = gpiochip_add_pingroup_range(chip, pctldev,
409 pinspec.args[0], name);
410 if (ret)
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200411 return ret;
Christian Ruppert586a87e2013-10-15 15:37:54 +0200412 }
Haojian Zhuangad4e1a72013-02-17 19:42:48 +0800413 }
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200414
415 return 0;
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530416}
417
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530418#else
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200419static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; }
Shiraz Hashimf23f1512012-10-27 15:21:36 +0530420#endif
421
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200422int of_gpiochip_add(struct gpio_chip *chip)
Anton Vorontsov391c9702010-06-08 07:48:17 -0600423{
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200424 int status;
425
Anton Vorontsov391c9702010-06-08 07:48:17 -0600426 if ((!chip->of_node) && (chip->dev))
427 chip->of_node = chip->dev->of_node;
428
429 if (!chip->of_node)
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200430 return 0;
Anton Vorontsov391c9702010-06-08 07:48:17 -0600431
432 if (!chip->of_xlate) {
433 chip->of_gpio_n_cells = 2;
434 chip->of_xlate = of_gpio_simple_xlate;
435 }
436
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200437 status = of_gpiochip_add_pin_range(chip);
438 if (status)
439 return status;
440
Anton Vorontsov391c9702010-06-08 07:48:17 -0600441 of_node_get(chip->of_node);
Benoit Parrotf625d462015-02-02 11:44:44 -0600442
Markus Pargmannfd7337f2015-08-14 16:10:58 +0200443 of_gpiochip_scan_gpios(chip);
Tomeu Vizoso28355f82015-07-14 10:29:54 +0200444
445 return 0;
Anton Vorontsov391c9702010-06-08 07:48:17 -0600446}
447
448void of_gpiochip_remove(struct gpio_chip *chip)
449{
Linus Walleije93fa3f2012-11-06 15:03:47 +0100450 gpiochip_remove_pin_ranges(chip);
Julia Lawall8a691552014-08-08 12:07:51 +0200451 of_node_put(chip->of_node);
Anton Vorontsov391c9702010-06-08 07:48:17 -0600452}