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); | |
6662ae6a MR |
244 | /* |
245 | * -EPROBE_DEFER in our case means that we found a | |
246 | * valid GPIO property, but no controller has been | |
247 | * registered so far. | |
248 | * | |
249 | * This means we don't need to look any further for | |
250 | * alternate name conventions, and we should really | |
251 | * preserve the return code for our user to be able to | |
252 | * retry probing later. | |
253 | */ | |
254 | if (IS_ERR(desc) && PTR_ERR(desc) == -EPROBE_DEFER) | |
255 | return desc; | |
256 | ||
ea713bc4 LW |
257 | if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT)) |
258 | break; | |
259 | } | |
260 | ||
c8582339 LW |
261 | /* Special handling for SPI GPIOs if used */ |
262 | if (IS_ERR(desc)) | |
263 | desc = of_find_spi_gpio(dev, con_id, &of_flags); | |
264 | ||
6a537d48 | 265 | /* Special handling for regulator GPIOs if used */ |
ce27fb2c | 266 | if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER) |
6a537d48 LW |
267 | desc = of_find_regulator_gpio(dev, con_id, &of_flags); |
268 | ||
ea713bc4 LW |
269 | if (IS_ERR(desc)) |
270 | return desc; | |
271 | ||
272 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
273 | *flags |= GPIO_ACTIVE_LOW; | |
274 | ||
275 | if (of_flags & OF_GPIO_SINGLE_ENDED) { | |
4c0facdd | 276 | if (of_flags & OF_GPIO_OPEN_DRAIN) |
ea713bc4 LW |
277 | *flags |= GPIO_OPEN_DRAIN; |
278 | else | |
279 | *flags |= GPIO_OPEN_SOURCE; | |
280 | } | |
281 | ||
e10f72bf AJ |
282 | if (of_flags & OF_GPIO_TRANSITORY) |
283 | *flags |= GPIO_TRANSITORY; | |
05f479bf | 284 | |
ea713bc4 LW |
285 | return desc; |
286 | } | |
287 | ||
f625d460 | 288 | /** |
fd7337fd | 289 | * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API |
f625d460 | 290 | * @np: device node to get GPIO from |
be715343 | 291 | * @chip: GPIO chip whose hog is parsed |
a79fead5 | 292 | * @idx: Index of the GPIO to parse |
f625d460 BP |
293 | * @name: GPIO line name |
294 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
fd7337fd | 295 | * of_parse_own_gpio() |
f625d460 BP |
296 | * @dflags: gpiod_flags - optional GPIO initialization flags |
297 | * | |
298 | * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno | |
299 | * value on the error condition. | |
300 | */ | |
fd7337fd | 301 | static struct gpio_desc *of_parse_own_gpio(struct device_node *np, |
be715343 | 302 | struct gpio_chip *chip, |
a79fead5 | 303 | unsigned int idx, const char **name, |
fd7337fd MP |
304 | enum gpio_lookup_flags *lflags, |
305 | enum gpiod_flags *dflags) | |
f625d460 BP |
306 | { |
307 | struct device_node *chip_np; | |
308 | enum of_gpio_flags xlate_flags; | |
be715343 MY |
309 | struct of_phandle_args gpiospec; |
310 | struct gpio_desc *desc; | |
a79fead5 | 311 | unsigned int i; |
f625d460 | 312 | u32 tmp; |
3f9547e1 | 313 | int ret; |
f625d460 | 314 | |
be715343 | 315 | chip_np = chip->of_node; |
f625d460 BP |
316 | if (!chip_np) |
317 | return ERR_PTR(-EINVAL); | |
318 | ||
319 | xlate_flags = 0; | |
320 | *lflags = 0; | |
321 | *dflags = 0; | |
322 | ||
323 | ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp); | |
324 | if (ret) | |
325 | return ERR_PTR(ret); | |
326 | ||
be715343 MY |
327 | gpiospec.np = chip_np; |
328 | gpiospec.args_count = tmp; | |
f625d460 | 329 | |
a79fead5 GU |
330 | for (i = 0; i < tmp; i++) { |
331 | ret = of_property_read_u32_index(np, "gpios", idx * tmp + i, | |
332 | &gpiospec.args[i]); | |
333 | if (ret) | |
334 | return ERR_PTR(ret); | |
335 | } | |
f625d460 | 336 | |
99468c1a | 337 | desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags); |
be715343 MY |
338 | if (IS_ERR(desc)) |
339 | return desc; | |
f625d460 BP |
340 | |
341 | if (xlate_flags & OF_GPIO_ACTIVE_LOW) | |
342 | *lflags |= GPIO_ACTIVE_LOW; | |
e10f72bf AJ |
343 | if (xlate_flags & OF_GPIO_TRANSITORY) |
344 | *lflags |= GPIO_TRANSITORY; | |
f625d460 BP |
345 | |
346 | if (of_property_read_bool(np, "input")) | |
347 | *dflags |= GPIOD_IN; | |
348 | else if (of_property_read_bool(np, "output-low")) | |
349 | *dflags |= GPIOD_OUT_LOW; | |
350 | else if (of_property_read_bool(np, "output-high")) | |
351 | *dflags |= GPIOD_OUT_HIGH; | |
352 | else { | |
353 | pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n", | |
be715343 | 354 | desc_to_gpio(desc), np->name); |
f625d460 BP |
355 | return ERR_PTR(-EINVAL); |
356 | } | |
357 | ||
358 | if (name && of_property_read_string(np, "line-name", name)) | |
359 | *name = np->name; | |
360 | ||
be715343 | 361 | return desc; |
f625d460 BP |
362 | } |
363 | ||
364 | /** | |
fd7337fd | 365 | * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions |
f625d460 BP |
366 | * @chip: gpio chip to act on |
367 | * | |
368 | * This is only used by of_gpiochip_add to request/set GPIO initial | |
369 | * configuration. | |
ead066e6 | 370 | * It returns error if it fails otherwise 0 on success. |
f625d460 | 371 | */ |
dfbd379b | 372 | static int of_gpiochip_scan_gpios(struct gpio_chip *chip) |
f625d460 BP |
373 | { |
374 | struct gpio_desc *desc = NULL; | |
375 | struct device_node *np; | |
376 | const char *name; | |
377 | enum gpio_lookup_flags lflags; | |
378 | enum gpiod_flags dflags; | |
a79fead5 | 379 | unsigned int i; |
dfbd379b | 380 | int ret; |
f625d460 | 381 | |
d1279d94 | 382 | for_each_available_child_of_node(chip->of_node, np) { |
f625d460 BP |
383 | if (!of_property_read_bool(np, "gpio-hog")) |
384 | continue; | |
385 | ||
a79fead5 GU |
386 | for (i = 0;; i++) { |
387 | desc = of_parse_own_gpio(np, chip, i, &name, &lflags, | |
388 | &dflags); | |
389 | if (IS_ERR(desc)) | |
390 | break; | |
391 | ||
392 | ret = gpiod_hog(desc, name, lflags, dflags); | |
393 | if (ret < 0) { | |
394 | of_node_put(np); | |
395 | return ret; | |
396 | } | |
09e258af | 397 | } |
f625d460 | 398 | } |
dfbd379b LD |
399 | |
400 | return 0; | |
f625d460 BP |
401 | } |
402 | ||
863fbf49 | 403 | /** |
67049c50 | 404 | * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags |
a19e3da5 | 405 | * @gc: pointer to the gpio_chip structure |
67049c50 | 406 | * @gpiospec: GPIO specifier as found in the device tree |
b908b53d | 407 | * @flags: a flags pointer to fill in |
863fbf49 AV |
408 | * |
409 | * This is simple translation function, suitable for the most 1:1 mapped | |
67049c50 | 410 | * GPIO chips. This function performs only one sanity check: whether GPIO |
863fbf49 AV |
411 | * is less than ngpios (that is specified in the gpio_chip). |
412 | */ | |
15c9a0ac GL |
413 | int of_gpio_simple_xlate(struct gpio_chip *gc, |
414 | const struct of_phandle_args *gpiospec, u32 *flags) | |
863fbf49 | 415 | { |
b908b53d AV |
416 | /* |
417 | * We're discouraging gpio_cells < 2, since that way you'll have to | |
20a8a968 | 418 | * write your own xlate function (that will have to retrieve the GPIO |
b908b53d AV |
419 | * number and the flags from a single gpio cell -- this is possible, |
420 | * but not recommended). | |
421 | */ | |
a19e3da5 | 422 | if (gc->of_gpio_n_cells < 2) { |
b908b53d AV |
423 | WARN_ON(1); |
424 | return -EINVAL; | |
425 | } | |
426 | ||
15c9a0ac GL |
427 | if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) |
428 | return -EINVAL; | |
429 | ||
6270d830 | 430 | if (gpiospec->args[0] >= gc->ngpio) |
863fbf49 AV |
431 | return -EINVAL; |
432 | ||
b908b53d | 433 | if (flags) |
15c9a0ac | 434 | *flags = gpiospec->args[1]; |
b908b53d | 435 | |
15c9a0ac | 436 | return gpiospec->args[0]; |
863fbf49 | 437 | } |
3038bbdf | 438 | EXPORT_SYMBOL(of_gpio_simple_xlate); |
863fbf49 | 439 | |
863fbf49 | 440 | /** |
3208b0f0 | 441 | * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank) |
863fbf49 AV |
442 | * @np: device node of the GPIO chip |
443 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
3208b0f0 | 444 | * @data: driver data to store in the struct gpio_chip |
863fbf49 AV |
445 | * |
446 | * To use this function you should allocate and fill mm_gc with: | |
447 | * | |
448 | * 1) In the gpio_chip structure: | |
449 | * - all the callbacks | |
a19e3da5 AV |
450 | * - of_gpio_n_cells |
451 | * - of_xlate callback (optional) | |
863fbf49 AV |
452 | * |
453 | * 3) In the of_mm_gpio_chip structure: | |
454 | * - save_regs callback (optional) | |
455 | * | |
456 | * If succeeded, this function will map bank's memory and will | |
457 | * do all necessary work for you. Then you'll able to use .regs | |
458 | * to manage GPIOs from the callbacks. | |
459 | */ | |
3208b0f0 LW |
460 | int of_mm_gpiochip_add_data(struct device_node *np, |
461 | struct of_mm_gpio_chip *mm_gc, | |
462 | void *data) | |
863fbf49 AV |
463 | { |
464 | int ret = -ENOMEM; | |
a19e3da5 | 465 | struct gpio_chip *gc = &mm_gc->gc; |
863fbf49 | 466 | |
7eb6ce2f | 467 | gc->label = kasprintf(GFP_KERNEL, "%pOF", np); |
863fbf49 AV |
468 | if (!gc->label) |
469 | goto err0; | |
470 | ||
471 | mm_gc->regs = of_iomap(np, 0); | |
472 | if (!mm_gc->regs) | |
473 | goto err1; | |
474 | ||
21451155 | 475 | gc->base = -1; |
863fbf49 | 476 | |
863fbf49 AV |
477 | if (mm_gc->save_regs) |
478 | mm_gc->save_regs(mm_gc); | |
479 | ||
a19e3da5 | 480 | mm_gc->gc.of_node = np; |
863fbf49 | 481 | |
3208b0f0 | 482 | ret = gpiochip_add_data(gc, data); |
863fbf49 AV |
483 | if (ret) |
484 | goto err2; | |
485 | ||
863fbf49 AV |
486 | return 0; |
487 | err2: | |
863fbf49 AV |
488 | iounmap(mm_gc->regs); |
489 | err1: | |
490 | kfree(gc->label); | |
491 | err0: | |
7eb6ce2f | 492 | pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret); |
863fbf49 AV |
493 | return ret; |
494 | } | |
3208b0f0 | 495 | EXPORT_SYMBOL(of_mm_gpiochip_add_data); |
594fa265 | 496 | |
d621e8ba RRD |
497 | /** |
498 | * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank) | |
499 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
500 | */ | |
501 | void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) | |
502 | { | |
503 | struct gpio_chip *gc = &mm_gc->gc; | |
504 | ||
505 | if (!mm_gc) | |
506 | return; | |
507 | ||
508 | gpiochip_remove(gc); | |
509 | iounmap(mm_gc->regs); | |
510 | kfree(gc->label); | |
511 | } | |
512 | EXPORT_SYMBOL(of_mm_gpiochip_remove); | |
513 | ||
f23f1516 | 514 | #ifdef CONFIG_PINCTRL |
28355f81 | 515 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) |
f23f1516 SH |
516 | { |
517 | struct device_node *np = chip->of_node; | |
f23f1516 | 518 | struct of_phandle_args pinspec; |
1e63d7b9 | 519 | struct pinctrl_dev *pctldev; |
f23f1516 | 520 | int index = 0, ret; |
586a87e6 CR |
521 | const char *name; |
522 | static const char group_names_propname[] = "gpio-ranges-group-names"; | |
523 | struct property *group_names; | |
f23f1516 SH |
524 | |
525 | if (!np) | |
28355f81 | 526 | return 0; |
f23f1516 | 527 | |
586a87e6 CR |
528 | group_names = of_find_property(np, group_names_propname, NULL); |
529 | ||
ad4e1a7c | 530 | for (;; index++) { |
d9fe0039 SW |
531 | ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, |
532 | index, &pinspec); | |
f23f1516 SH |
533 | if (ret) |
534 | break; | |
535 | ||
1e63d7b9 | 536 | pctldev = of_pinctrl_get(pinspec.np); |
602cf638 | 537 | of_node_put(pinspec.np); |
1e63d7b9 | 538 | if (!pctldev) |
28355f81 | 539 | return -EPROBE_DEFER; |
f23f1516 | 540 | |
586a87e6 CR |
541 | if (pinspec.args[2]) { |
542 | if (group_names) { | |
72858602 | 543 | of_property_read_string_index(np, |
586a87e6 CR |
544 | group_names_propname, |
545 | index, &name); | |
546 | if (strlen(name)) { | |
7eb6ce2f RH |
547 | pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n", |
548 | np); | |
586a87e6 CR |
549 | break; |
550 | } | |
551 | } | |
552 | /* npins != 0: linear range */ | |
553 | ret = gpiochip_add_pin_range(chip, | |
554 | pinctrl_dev_get_devname(pctldev), | |
555 | pinspec.args[0], | |
556 | pinspec.args[1], | |
557 | pinspec.args[2]); | |
558 | if (ret) | |
28355f81 | 559 | return ret; |
586a87e6 CR |
560 | } else { |
561 | /* npins == 0: special range */ | |
562 | if (pinspec.args[1]) { | |
7eb6ce2f RH |
563 | pr_err("%pOF: Illegal gpio-range format.\n", |
564 | np); | |
586a87e6 CR |
565 | break; |
566 | } | |
567 | ||
568 | if (!group_names) { | |
7eb6ce2f RH |
569 | pr_err("%pOF: GPIO group range requested but no %s property.\n", |
570 | np, group_names_propname); | |
586a87e6 CR |
571 | break; |
572 | } | |
573 | ||
574 | ret = of_property_read_string_index(np, | |
575 | group_names_propname, | |
576 | index, &name); | |
577 | if (ret) | |
578 | break; | |
579 | ||
580 | if (!strlen(name)) { | |
7eb6ce2f RH |
581 | pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n", |
582 | np); | |
586a87e6 CR |
583 | break; |
584 | } | |
585 | ||
586 | ret = gpiochip_add_pingroup_range(chip, pctldev, | |
587 | pinspec.args[0], name); | |
588 | if (ret) | |
28355f81 | 589 | return ret; |
586a87e6 | 590 | } |
ad4e1a7c | 591 | } |
28355f81 TV |
592 | |
593 | return 0; | |
f23f1516 SH |
594 | } |
595 | ||
f23f1516 | 596 | #else |
28355f81 | 597 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } |
f23f1516 SH |
598 | #endif |
599 | ||
28355f81 | 600 | int of_gpiochip_add(struct gpio_chip *chip) |
391c970c | 601 | { |
28355f81 TV |
602 | int status; |
603 | ||
58383c78 LW |
604 | if ((!chip->of_node) && (chip->parent)) |
605 | chip->of_node = chip->parent->of_node; | |
391c970c AV |
606 | |
607 | if (!chip->of_node) | |
28355f81 | 608 | return 0; |
391c970c AV |
609 | |
610 | if (!chip->of_xlate) { | |
611 | chip->of_gpio_n_cells = 2; | |
612 | chip->of_xlate = of_gpio_simple_xlate; | |
613 | } | |
614 | ||
1020dfd1 MY |
615 | if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS) |
616 | return -EINVAL; | |
617 | ||
28355f81 TV |
618 | status = of_gpiochip_add_pin_range(chip); |
619 | if (status) | |
620 | return status; | |
621 | ||
fd9c5531 LW |
622 | /* If the chip defines names itself, these take precedence */ |
623 | if (!chip->names) | |
82270335 CL |
624 | devprop_gpiochip_set_names(chip, |
625 | of_fwnode_handle(chip->of_node)); | |
fd9c5531 | 626 | |
391c970c | 627 | of_node_get(chip->of_node); |
f625d460 | 628 | |
dfbd379b | 629 | return of_gpiochip_scan_gpios(chip); |
391c970c AV |
630 | } |
631 | ||
632 | void of_gpiochip_remove(struct gpio_chip *chip) | |
633 | { | |
e93fa3f2 | 634 | gpiochip_remove_pin_ranges(chip); |
8a691550 | 635 | of_node_put(chip->of_node); |
391c970c | 636 | } |