Commit | Line | Data |
---|---|---|
863fbf49 AV |
1 | /* |
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 | ||
2e13cba8 | 14 | #include <linux/device.h> |
bea4dbee | 15 | #include <linux/err.h> |
863fbf49 | 16 | #include <linux/errno.h> |
2e13cba8 | 17 | #include <linux/module.h> |
863fbf49 | 18 | #include <linux/io.h> |
af8b6375 | 19 | #include <linux/gpio/consumer.h> |
863fbf49 | 20 | #include <linux/of.h> |
2e13cba8 | 21 | #include <linux/of_address.h> |
863fbf49 | 22 | #include <linux/of_gpio.h> |
f23f1516 | 23 | #include <linux/pinctrl/pinctrl.h> |
2e13cba8 | 24 | #include <linux/slab.h> |
f625d460 | 25 | #include <linux/gpio/machine.h> |
863fbf49 | 26 | |
1bd6b601 | 27 | #include "gpiolib.h" |
af8b6375 | 28 | |
c7e9d398 | 29 | static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data) |
3d0f7cf0 | 30 | { |
c7e9d398 MY |
31 | struct of_phandle_args *gpiospec = data; |
32 | ||
33 | return chip->gpiodev->dev.of_node == gpiospec->np && | |
34 | chip->of_xlate(chip, gpiospec, NULL) >= 0; | |
762c2e46 | 35 | } |
3d0f7cf0 | 36 | |
c7e9d398 MY |
37 | static struct gpio_chip *of_find_gpiochip_by_xlate( |
38 | struct of_phandle_args *gpiospec) | |
762c2e46 | 39 | { |
c7e9d398 | 40 | return gpiochip_find(gpiospec, of_gpiochip_match_node_and_xlate); |
3d0f7cf0 | 41 | } |
3d0f7cf0 | 42 | |
99468c1a MY |
43 | static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip, |
44 | struct of_phandle_args *gpiospec, | |
45 | enum of_gpio_flags *flags) | |
3d0f7cf0 | 46 | { |
3d0f7cf0 GL |
47 | int ret; |
48 | ||
99468c1a MY |
49 | if (chip->of_gpio_n_cells != gpiospec->args_count) |
50 | return ERR_PTR(-EINVAL); | |
51 | ||
52 | ret = chip->of_xlate(chip, gpiospec, flags); | |
53 | if (ret < 0) | |
54 | return ERR_PTR(ret); | |
55 | ||
56 | return gpiochip_get_desc(chip, ret); | |
3d0f7cf0 GL |
57 | } |
58 | ||
a603a2b8 LW |
59 | static void of_gpio_flags_quirks(struct device_node *np, |
60 | enum of_gpio_flags *flags) | |
61 | { | |
62 | /* | |
63 | * Some GPIO fixed regulator quirks. | |
64 | * Note that active low is the default. | |
65 | */ | |
66 | if (IS_ENABLED(CONFIG_REGULATOR) && | |
67 | (of_device_is_compatible(np, "reg-fixed-voltage") || | |
68 | of_device_is_compatible(np, "regulator-gpio"))) { | |
69 | /* | |
70 | * The regulator GPIO handles are specified such that the | |
71 | * presence or absence of "enable-active-high" solely controls | |
72 | * the polarity of the GPIO line. Any phandle flags must | |
73 | * be actively ignored. | |
74 | */ | |
75 | if (*flags & OF_GPIO_ACTIVE_LOW) { | |
76 | pr_warn("%s GPIO handle specifies active low - ignored\n", | |
77 | of_node_full_name(np)); | |
78 | *flags &= ~OF_GPIO_ACTIVE_LOW; | |
79 | } | |
80 | if (!of_property_read_bool(np, "enable-active-high")) | |
81 | *flags |= OF_GPIO_ACTIVE_LOW; | |
82 | } | |
83 | /* | |
84 | * Legacy open drain handling for fixed voltage regulators. | |
85 | */ | |
86 | if (IS_ENABLED(CONFIG_REGULATOR) && | |
87 | of_device_is_compatible(np, "reg-fixed-voltage") && | |
88 | of_property_read_bool(np, "gpio-open-drain")) { | |
89 | *flags |= (OF_GPIO_SINGLE_ENDED | OF_GPIO_OPEN_DRAIN); | |
90 | pr_info("%s uses legacy open drain flag - update the DTS if you can\n", | |
91 | of_node_full_name(np)); | |
92 | } | |
93 | } | |
94 | ||
863fbf49 | 95 | /** |
af8b6375 | 96 | * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API |
863fbf49 | 97 | * @np: device node to get GPIO from |
a6b09191 | 98 | * @propname: property name containing gpio specifier(s) |
863fbf49 | 99 | * @index: index of the GPIO |
b908b53d | 100 | * @flags: a flags pointer to fill in |
863fbf49 | 101 | * |
af8b6375 | 102 | * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno |
b908b53d AV |
103 | * value on the error condition. If @flags is not NULL the function also fills |
104 | * in flags for the GPIO. | |
863fbf49 | 105 | */ |
af8b6375 AC |
106 | struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, |
107 | const char *propname, int index, enum of_gpio_flags *flags) | |
863fbf49 | 108 | { |
762c2e46 MY |
109 | struct of_phandle_args gpiospec; |
110 | struct gpio_chip *chip; | |
111 | struct gpio_desc *desc; | |
64b60e09 | 112 | int ret; |
3d0f7cf0 | 113 | |
15c9a0ac | 114 | ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index, |
762c2e46 | 115 | &gpiospec); |
64b60e09 | 116 | if (ret) { |
7eb6ce2f RH |
117 | pr_debug("%s: can't parse '%s' property of node '%pOF[%d]'\n", |
118 | __func__, propname, np, index); | |
af8b6375 | 119 | return ERR_PTR(ret); |
863fbf49 AV |
120 | } |
121 | ||
c7e9d398 | 122 | chip = of_find_gpiochip_by_xlate(&gpiospec); |
762c2e46 MY |
123 | if (!chip) { |
124 | desc = ERR_PTR(-EPROBE_DEFER); | |
125 | goto out; | |
126 | } | |
762c2e46 | 127 | |
99468c1a | 128 | desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, flags); |
762c2e46 MY |
129 | if (IS_ERR(desc)) |
130 | goto out; | |
863fbf49 | 131 | |
605f2d34 LW |
132 | if (flags) |
133 | of_gpio_flags_quirks(np, flags); | |
a603a2b8 | 134 | |
7eb6ce2f RH |
135 | pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n", |
136 | __func__, propname, np, index, | |
762c2e46 MY |
137 | PTR_ERR_OR_ZERO(desc)); |
138 | ||
139 | out: | |
140 | of_node_put(gpiospec.np); | |
141 | ||
142 | return desc; | |
863fbf49 | 143 | } |
863fbf49 | 144 | |
f01d9075 AC |
145 | int of_get_named_gpio_flags(struct device_node *np, const char *list_name, |
146 | int index, enum of_gpio_flags *flags) | |
147 | { | |
148 | struct gpio_desc *desc; | |
149 | ||
150 | desc = of_get_named_gpiod_flags(np, list_name, index, flags); | |
151 | ||
152 | if (IS_ERR(desc)) | |
153 | return PTR_ERR(desc); | |
154 | else | |
155 | return desc_to_gpio(desc); | |
156 | } | |
157 | EXPORT_SYMBOL(of_get_named_gpio_flags); | |
158 | ||
c8582339 LW |
159 | /* |
160 | * The SPI GPIO bindings happened before we managed to establish that GPIO | |
161 | * properties should be named "foo-gpios" so we have this special kludge for | |
162 | * them. | |
163 | */ | |
164 | static struct gpio_desc *of_find_spi_gpio(struct device *dev, const char *con_id, | |
165 | enum of_gpio_flags *of_flags) | |
166 | { | |
167 | char prop_name[32]; /* 32 is max size of property name */ | |
168 | struct device_node *np = dev->of_node; | |
169 | struct gpio_desc *desc; | |
170 | ||
171 | /* | |
172 | * Hopefully the compiler stubs the rest of the function if this | |
173 | * is false. | |
174 | */ | |
175 | if (!IS_ENABLED(CONFIG_SPI_MASTER)) | |
176 | return ERR_PTR(-ENOENT); | |
177 | ||
178 | /* Allow this specifically for "spi-gpio" devices */ | |
179 | if (!of_device_is_compatible(np, "spi-gpio") || !con_id) | |
180 | return ERR_PTR(-ENOENT); | |
181 | ||
182 | /* Will be "gpio-sck", "gpio-mosi" or "gpio-miso" */ | |
183 | snprintf(prop_name, sizeof(prop_name), "%s-%s", "gpio", con_id); | |
184 | ||
185 | desc = of_get_named_gpiod_flags(np, prop_name, 0, of_flags); | |
186 | return desc; | |
187 | } | |
188 | ||
6a537d48 LW |
189 | /* |
190 | * Some regulator bindings happened before we managed to establish that GPIO | |
191 | * properties should be named "foo-gpios" so we have this special kludge for | |
192 | * them. | |
193 | */ | |
194 | static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *con_id, | |
195 | enum of_gpio_flags *of_flags) | |
196 | { | |
197 | /* These are the connection IDs we accept as legacy GPIO phandles */ | |
198 | const char *whitelist[] = { | |
199 | "wlf,ldoena", /* Arizona */ | |
200 | "wlf,ldo1ena", /* WM8994 */ | |
201 | "wlf,ldo2ena", /* WM8994 */ | |
202 | }; | |
203 | struct device_node *np = dev->of_node; | |
204 | struct gpio_desc *desc; | |
205 | int i; | |
206 | ||
207 | if (!IS_ENABLED(CONFIG_REGULATOR)) | |
208 | return ERR_PTR(-ENOENT); | |
209 | ||
210 | if (!con_id) | |
211 | return ERR_PTR(-ENOENT); | |
212 | ||
213 | for (i = 0; i < ARRAY_SIZE(whitelist); i++) | |
214 | if (!strcmp(con_id, whitelist[i])) | |
215 | break; | |
216 | ||
217 | if (i == ARRAY_SIZE(whitelist)) | |
218 | return ERR_PTR(-ENOENT); | |
219 | ||
220 | desc = of_get_named_gpiod_flags(np, con_id, 0, of_flags); | |
221 | return desc; | |
222 | } | |
223 | ||
ea713bc4 LW |
224 | struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, |
225 | unsigned int idx, | |
226 | enum gpio_lookup_flags *flags) | |
227 | { | |
228 | char prop_name[32]; /* 32 is max size of property name */ | |
229 | enum of_gpio_flags of_flags; | |
230 | struct gpio_desc *desc; | |
231 | unsigned int i; | |
232 | ||
c8582339 | 233 | /* Try GPIO property "foo-gpios" and "foo-gpio" */ |
ea713bc4 LW |
234 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
235 | if (con_id) | |
236 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, | |
237 | gpio_suffixes[i]); | |
238 | else | |
239 | snprintf(prop_name, sizeof(prop_name), "%s", | |
240 | gpio_suffixes[i]); | |
241 | ||
242 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, | |
243 | &of_flags); | |
244 | if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT)) | |
245 | break; | |
246 | } | |
247 | ||
c8582339 LW |
248 | /* Special handling for SPI GPIOs if used */ |
249 | if (IS_ERR(desc)) | |
250 | desc = of_find_spi_gpio(dev, con_id, &of_flags); | |
251 | ||
6a537d48 LW |
252 | /* Special handling for regulator GPIOs if used */ |
253 | if (IS_ERR(desc)) | |
254 | desc = of_find_regulator_gpio(dev, con_id, &of_flags); | |
255 | ||
ea713bc4 LW |
256 | if (IS_ERR(desc)) |
257 | return desc; | |
258 | ||
259 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
260 | *flags |= GPIO_ACTIVE_LOW; | |
261 | ||
262 | if (of_flags & OF_GPIO_SINGLE_ENDED) { | |
4c0facdd | 263 | if (of_flags & OF_GPIO_OPEN_DRAIN) |
ea713bc4 LW |
264 | *flags |= GPIO_OPEN_DRAIN; |
265 | else | |
266 | *flags |= GPIO_OPEN_SOURCE; | |
267 | } | |
268 | ||
e10f72bf AJ |
269 | if (of_flags & OF_GPIO_TRANSITORY) |
270 | *flags |= GPIO_TRANSITORY; | |
05f479bf | 271 | |
ea713bc4 LW |
272 | return desc; |
273 | } | |
274 | ||
f625d460 | 275 | /** |
fd7337fd | 276 | * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API |
f625d460 | 277 | * @np: device node to get GPIO from |
be715343 | 278 | * @chip: GPIO chip whose hog is parsed |
a79fead5 | 279 | * @idx: Index of the GPIO to parse |
f625d460 BP |
280 | * @name: GPIO line name |
281 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
fd7337fd | 282 | * of_parse_own_gpio() |
f625d460 BP |
283 | * @dflags: gpiod_flags - optional GPIO initialization flags |
284 | * | |
285 | * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno | |
286 | * value on the error condition. | |
287 | */ | |
fd7337fd | 288 | static struct gpio_desc *of_parse_own_gpio(struct device_node *np, |
be715343 | 289 | struct gpio_chip *chip, |
a79fead5 | 290 | unsigned int idx, const char **name, |
fd7337fd MP |
291 | enum gpio_lookup_flags *lflags, |
292 | enum gpiod_flags *dflags) | |
f625d460 BP |
293 | { |
294 | struct device_node *chip_np; | |
295 | enum of_gpio_flags xlate_flags; | |
be715343 MY |
296 | struct of_phandle_args gpiospec; |
297 | struct gpio_desc *desc; | |
a79fead5 | 298 | unsigned int i; |
f625d460 | 299 | u32 tmp; |
3f9547e1 | 300 | int ret; |
f625d460 | 301 | |
be715343 | 302 | chip_np = chip->of_node; |
f625d460 BP |
303 | if (!chip_np) |
304 | return ERR_PTR(-EINVAL); | |
305 | ||
306 | xlate_flags = 0; | |
307 | *lflags = 0; | |
308 | *dflags = 0; | |
309 | ||
310 | ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp); | |
311 | if (ret) | |
312 | return ERR_PTR(ret); | |
313 | ||
be715343 MY |
314 | gpiospec.np = chip_np; |
315 | gpiospec.args_count = tmp; | |
f625d460 | 316 | |
a79fead5 GU |
317 | for (i = 0; i < tmp; i++) { |
318 | ret = of_property_read_u32_index(np, "gpios", idx * tmp + i, | |
319 | &gpiospec.args[i]); | |
320 | if (ret) | |
321 | return ERR_PTR(ret); | |
322 | } | |
f625d460 | 323 | |
99468c1a | 324 | desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags); |
be715343 MY |
325 | if (IS_ERR(desc)) |
326 | return desc; | |
f625d460 BP |
327 | |
328 | if (xlate_flags & OF_GPIO_ACTIVE_LOW) | |
329 | *lflags |= GPIO_ACTIVE_LOW; | |
e10f72bf AJ |
330 | if (xlate_flags & OF_GPIO_TRANSITORY) |
331 | *lflags |= GPIO_TRANSITORY; | |
f625d460 BP |
332 | |
333 | if (of_property_read_bool(np, "input")) | |
334 | *dflags |= GPIOD_IN; | |
335 | else if (of_property_read_bool(np, "output-low")) | |
336 | *dflags |= GPIOD_OUT_LOW; | |
337 | else if (of_property_read_bool(np, "output-high")) | |
338 | *dflags |= GPIOD_OUT_HIGH; | |
339 | else { | |
340 | pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n", | |
be715343 | 341 | desc_to_gpio(desc), np->name); |
f625d460 BP |
342 | return ERR_PTR(-EINVAL); |
343 | } | |
344 | ||
345 | if (name && of_property_read_string(np, "line-name", name)) | |
346 | *name = np->name; | |
347 | ||
be715343 | 348 | return desc; |
f625d460 BP |
349 | } |
350 | ||
351 | /** | |
fd7337fd | 352 | * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions |
f625d460 BP |
353 | * @chip: gpio chip to act on |
354 | * | |
355 | * This is only used by of_gpiochip_add to request/set GPIO initial | |
356 | * configuration. | |
ead066e6 | 357 | * It returns error if it fails otherwise 0 on success. |
f625d460 | 358 | */ |
dfbd379b | 359 | static int of_gpiochip_scan_gpios(struct gpio_chip *chip) |
f625d460 BP |
360 | { |
361 | struct gpio_desc *desc = NULL; | |
362 | struct device_node *np; | |
363 | const char *name; | |
364 | enum gpio_lookup_flags lflags; | |
365 | enum gpiod_flags dflags; | |
a79fead5 | 366 | unsigned int i; |
dfbd379b | 367 | int ret; |
f625d460 | 368 | |
d1279d94 | 369 | for_each_available_child_of_node(chip->of_node, np) { |
f625d460 BP |
370 | if (!of_property_read_bool(np, "gpio-hog")) |
371 | continue; | |
372 | ||
a79fead5 GU |
373 | for (i = 0;; i++) { |
374 | desc = of_parse_own_gpio(np, chip, i, &name, &lflags, | |
375 | &dflags); | |
376 | if (IS_ERR(desc)) | |
377 | break; | |
378 | ||
379 | ret = gpiod_hog(desc, name, lflags, dflags); | |
380 | if (ret < 0) { | |
381 | of_node_put(np); | |
382 | return ret; | |
383 | } | |
09e258af | 384 | } |
f625d460 | 385 | } |
dfbd379b LD |
386 | |
387 | return 0; | |
f625d460 BP |
388 | } |
389 | ||
863fbf49 | 390 | /** |
67049c50 | 391 | * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags |
a19e3da5 | 392 | * @gc: pointer to the gpio_chip structure |
67049c50 | 393 | * @gpiospec: GPIO specifier as found in the device tree |
b908b53d | 394 | * @flags: a flags pointer to fill in |
863fbf49 AV |
395 | * |
396 | * This is simple translation function, suitable for the most 1:1 mapped | |
67049c50 | 397 | * GPIO chips. This function performs only one sanity check: whether GPIO |
863fbf49 AV |
398 | * is less than ngpios (that is specified in the gpio_chip). |
399 | */ | |
15c9a0ac GL |
400 | int of_gpio_simple_xlate(struct gpio_chip *gc, |
401 | const struct of_phandle_args *gpiospec, u32 *flags) | |
863fbf49 | 402 | { |
b908b53d AV |
403 | /* |
404 | * We're discouraging gpio_cells < 2, since that way you'll have to | |
20a8a968 | 405 | * write your own xlate function (that will have to retrieve the GPIO |
b908b53d AV |
406 | * number and the flags from a single gpio cell -- this is possible, |
407 | * but not recommended). | |
408 | */ | |
a19e3da5 | 409 | if (gc->of_gpio_n_cells < 2) { |
b908b53d AV |
410 | WARN_ON(1); |
411 | return -EINVAL; | |
412 | } | |
413 | ||
15c9a0ac GL |
414 | if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) |
415 | return -EINVAL; | |
416 | ||
6270d830 | 417 | if (gpiospec->args[0] >= gc->ngpio) |
863fbf49 AV |
418 | return -EINVAL; |
419 | ||
b908b53d | 420 | if (flags) |
15c9a0ac | 421 | *flags = gpiospec->args[1]; |
b908b53d | 422 | |
15c9a0ac | 423 | return gpiospec->args[0]; |
863fbf49 | 424 | } |
3038bbdf | 425 | EXPORT_SYMBOL(of_gpio_simple_xlate); |
863fbf49 | 426 | |
863fbf49 | 427 | /** |
3208b0f0 | 428 | * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank) |
863fbf49 AV |
429 | * @np: device node of the GPIO chip |
430 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
3208b0f0 | 431 | * @data: driver data to store in the struct gpio_chip |
863fbf49 AV |
432 | * |
433 | * To use this function you should allocate and fill mm_gc with: | |
434 | * | |
435 | * 1) In the gpio_chip structure: | |
436 | * - all the callbacks | |
a19e3da5 AV |
437 | * - of_gpio_n_cells |
438 | * - of_xlate callback (optional) | |
863fbf49 AV |
439 | * |
440 | * 3) In the of_mm_gpio_chip structure: | |
441 | * - save_regs callback (optional) | |
442 | * | |
443 | * If succeeded, this function will map bank's memory and will | |
444 | * do all necessary work for you. Then you'll able to use .regs | |
445 | * to manage GPIOs from the callbacks. | |
446 | */ | |
3208b0f0 LW |
447 | int of_mm_gpiochip_add_data(struct device_node *np, |
448 | struct of_mm_gpio_chip *mm_gc, | |
449 | void *data) | |
863fbf49 AV |
450 | { |
451 | int ret = -ENOMEM; | |
a19e3da5 | 452 | struct gpio_chip *gc = &mm_gc->gc; |
863fbf49 | 453 | |
7eb6ce2f | 454 | gc->label = kasprintf(GFP_KERNEL, "%pOF", np); |
863fbf49 AV |
455 | if (!gc->label) |
456 | goto err0; | |
457 | ||
458 | mm_gc->regs = of_iomap(np, 0); | |
459 | if (!mm_gc->regs) | |
460 | goto err1; | |
461 | ||
21451155 | 462 | gc->base = -1; |
863fbf49 | 463 | |
863fbf49 AV |
464 | if (mm_gc->save_regs) |
465 | mm_gc->save_regs(mm_gc); | |
466 | ||
a19e3da5 | 467 | mm_gc->gc.of_node = np; |
863fbf49 | 468 | |
3208b0f0 | 469 | ret = gpiochip_add_data(gc, data); |
863fbf49 AV |
470 | if (ret) |
471 | goto err2; | |
472 | ||
863fbf49 AV |
473 | return 0; |
474 | err2: | |
863fbf49 AV |
475 | iounmap(mm_gc->regs); |
476 | err1: | |
477 | kfree(gc->label); | |
478 | err0: | |
7eb6ce2f | 479 | pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret); |
863fbf49 AV |
480 | return ret; |
481 | } | |
3208b0f0 | 482 | EXPORT_SYMBOL(of_mm_gpiochip_add_data); |
594fa265 | 483 | |
d621e8ba RRD |
484 | /** |
485 | * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank) | |
486 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
487 | */ | |
488 | void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) | |
489 | { | |
490 | struct gpio_chip *gc = &mm_gc->gc; | |
491 | ||
492 | if (!mm_gc) | |
493 | return; | |
494 | ||
495 | gpiochip_remove(gc); | |
496 | iounmap(mm_gc->regs); | |
497 | kfree(gc->label); | |
498 | } | |
499 | EXPORT_SYMBOL(of_mm_gpiochip_remove); | |
500 | ||
f23f1516 | 501 | #ifdef CONFIG_PINCTRL |
28355f81 | 502 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) |
f23f1516 SH |
503 | { |
504 | struct device_node *np = chip->of_node; | |
f23f1516 | 505 | struct of_phandle_args pinspec; |
1e63d7b9 | 506 | struct pinctrl_dev *pctldev; |
f23f1516 | 507 | int index = 0, ret; |
586a87e6 CR |
508 | const char *name; |
509 | static const char group_names_propname[] = "gpio-ranges-group-names"; | |
510 | struct property *group_names; | |
f23f1516 SH |
511 | |
512 | if (!np) | |
28355f81 | 513 | return 0; |
f23f1516 | 514 | |
586a87e6 CR |
515 | group_names = of_find_property(np, group_names_propname, NULL); |
516 | ||
ad4e1a7c | 517 | for (;; index++) { |
d9fe0039 SW |
518 | ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, |
519 | index, &pinspec); | |
f23f1516 SH |
520 | if (ret) |
521 | break; | |
522 | ||
1e63d7b9 | 523 | pctldev = of_pinctrl_get(pinspec.np); |
602cf638 | 524 | of_node_put(pinspec.np); |
1e63d7b9 | 525 | if (!pctldev) |
28355f81 | 526 | return -EPROBE_DEFER; |
f23f1516 | 527 | |
586a87e6 CR |
528 | if (pinspec.args[2]) { |
529 | if (group_names) { | |
72858602 | 530 | of_property_read_string_index(np, |
586a87e6 CR |
531 | group_names_propname, |
532 | index, &name); | |
533 | if (strlen(name)) { | |
7eb6ce2f RH |
534 | pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n", |
535 | np); | |
586a87e6 CR |
536 | break; |
537 | } | |
538 | } | |
539 | /* npins != 0: linear range */ | |
540 | ret = gpiochip_add_pin_range(chip, | |
541 | pinctrl_dev_get_devname(pctldev), | |
542 | pinspec.args[0], | |
543 | pinspec.args[1], | |
544 | pinspec.args[2]); | |
545 | if (ret) | |
28355f81 | 546 | return ret; |
586a87e6 CR |
547 | } else { |
548 | /* npins == 0: special range */ | |
549 | if (pinspec.args[1]) { | |
7eb6ce2f RH |
550 | pr_err("%pOF: Illegal gpio-range format.\n", |
551 | np); | |
586a87e6 CR |
552 | break; |
553 | } | |
554 | ||
555 | if (!group_names) { | |
7eb6ce2f RH |
556 | pr_err("%pOF: GPIO group range requested but no %s property.\n", |
557 | np, group_names_propname); | |
586a87e6 CR |
558 | break; |
559 | } | |
560 | ||
561 | ret = of_property_read_string_index(np, | |
562 | group_names_propname, | |
563 | index, &name); | |
564 | if (ret) | |
565 | break; | |
566 | ||
567 | if (!strlen(name)) { | |
7eb6ce2f RH |
568 | pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n", |
569 | np); | |
586a87e6 CR |
570 | break; |
571 | } | |
572 | ||
573 | ret = gpiochip_add_pingroup_range(chip, pctldev, | |
574 | pinspec.args[0], name); | |
575 | if (ret) | |
28355f81 | 576 | return ret; |
586a87e6 | 577 | } |
ad4e1a7c | 578 | } |
28355f81 TV |
579 | |
580 | return 0; | |
f23f1516 SH |
581 | } |
582 | ||
f23f1516 | 583 | #else |
28355f81 | 584 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } |
f23f1516 SH |
585 | #endif |
586 | ||
28355f81 | 587 | int of_gpiochip_add(struct gpio_chip *chip) |
391c970c | 588 | { |
28355f81 TV |
589 | int status; |
590 | ||
58383c78 LW |
591 | if ((!chip->of_node) && (chip->parent)) |
592 | chip->of_node = chip->parent->of_node; | |
391c970c AV |
593 | |
594 | if (!chip->of_node) | |
28355f81 | 595 | return 0; |
391c970c AV |
596 | |
597 | if (!chip->of_xlate) { | |
598 | chip->of_gpio_n_cells = 2; | |
599 | chip->of_xlate = of_gpio_simple_xlate; | |
600 | } | |
601 | ||
1020dfd1 MY |
602 | if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS) |
603 | return -EINVAL; | |
604 | ||
28355f81 TV |
605 | status = of_gpiochip_add_pin_range(chip); |
606 | if (status) | |
607 | return status; | |
608 | ||
fd9c5531 LW |
609 | /* If the chip defines names itself, these take precedence */ |
610 | if (!chip->names) | |
82270335 CL |
611 | devprop_gpiochip_set_names(chip, |
612 | of_fwnode_handle(chip->of_node)); | |
fd9c5531 | 613 | |
391c970c | 614 | of_node_get(chip->of_node); |
f625d460 | 615 | |
dfbd379b | 616 | return of_gpiochip_scan_gpios(chip); |
391c970c AV |
617 | } |
618 | ||
619 | void of_gpiochip_remove(struct gpio_chip *chip) | |
620 | { | |
e93fa3f2 | 621 | gpiochip_remove_pin_ranges(chip); |
8a691550 | 622 | of_node_put(chip->of_node); |
391c970c | 623 | } |