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 | |
c11e6f0f SB |
114 | ret = of_parse_phandle_with_args_map(np, propname, "gpio", index, |
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 | ||
4b21f94a AS |
213 | i = match_string(whitelist, ARRAY_SIZE(whitelist), con_id); |
214 | if (i < 0) | |
6a537d48 LW |
215 | return ERR_PTR(-ENOENT); |
216 | ||
217 | desc = of_get_named_gpiod_flags(np, con_id, 0, of_flags); | |
218 | return desc; | |
219 | } | |
220 | ||
ea713bc4 LW |
221 | struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, |
222 | unsigned int idx, | |
223 | enum gpio_lookup_flags *flags) | |
224 | { | |
225 | char prop_name[32]; /* 32 is max size of property name */ | |
226 | enum of_gpio_flags of_flags; | |
227 | struct gpio_desc *desc; | |
228 | unsigned int i; | |
229 | ||
c8582339 | 230 | /* Try GPIO property "foo-gpios" and "foo-gpio" */ |
ea713bc4 LW |
231 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
232 | if (con_id) | |
233 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, | |
234 | gpio_suffixes[i]); | |
235 | else | |
236 | snprintf(prop_name, sizeof(prop_name), "%s", | |
237 | gpio_suffixes[i]); | |
238 | ||
239 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, | |
240 | &of_flags); | |
6662ae6a MR |
241 | /* |
242 | * -EPROBE_DEFER in our case means that we found a | |
243 | * valid GPIO property, but no controller has been | |
244 | * registered so far. | |
245 | * | |
246 | * This means we don't need to look any further for | |
247 | * alternate name conventions, and we should really | |
248 | * preserve the return code for our user to be able to | |
249 | * retry probing later. | |
250 | */ | |
251 | if (IS_ERR(desc) && PTR_ERR(desc) == -EPROBE_DEFER) | |
252 | return desc; | |
253 | ||
ea713bc4 LW |
254 | if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT)) |
255 | break; | |
256 | } | |
257 | ||
c8582339 LW |
258 | /* Special handling for SPI GPIOs if used */ |
259 | if (IS_ERR(desc)) | |
260 | desc = of_find_spi_gpio(dev, con_id, &of_flags); | |
261 | ||
6a537d48 | 262 | /* Special handling for regulator GPIOs if used */ |
ce27fb2c | 263 | if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER) |
6a537d48 LW |
264 | desc = of_find_regulator_gpio(dev, con_id, &of_flags); |
265 | ||
ea713bc4 LW |
266 | if (IS_ERR(desc)) |
267 | return desc; | |
268 | ||
269 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
270 | *flags |= GPIO_ACTIVE_LOW; | |
271 | ||
272 | if (of_flags & OF_GPIO_SINGLE_ENDED) { | |
4c0facdd | 273 | if (of_flags & OF_GPIO_OPEN_DRAIN) |
ea713bc4 LW |
274 | *flags |= GPIO_OPEN_DRAIN; |
275 | else | |
276 | *flags |= GPIO_OPEN_SOURCE; | |
277 | } | |
278 | ||
e10f72bf AJ |
279 | if (of_flags & OF_GPIO_TRANSITORY) |
280 | *flags |= GPIO_TRANSITORY; | |
05f479bf | 281 | |
ea713bc4 LW |
282 | return desc; |
283 | } | |
284 | ||
f625d460 | 285 | /** |
fd7337fd | 286 | * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API |
f625d460 | 287 | * @np: device node to get GPIO from |
be715343 | 288 | * @chip: GPIO chip whose hog is parsed |
a79fead5 | 289 | * @idx: Index of the GPIO to parse |
f625d460 BP |
290 | * @name: GPIO line name |
291 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
fd7337fd | 292 | * of_parse_own_gpio() |
f625d460 BP |
293 | * @dflags: gpiod_flags - optional GPIO initialization flags |
294 | * | |
295 | * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno | |
296 | * value on the error condition. | |
297 | */ | |
fd7337fd | 298 | static struct gpio_desc *of_parse_own_gpio(struct device_node *np, |
be715343 | 299 | struct gpio_chip *chip, |
a79fead5 | 300 | unsigned int idx, const char **name, |
fd7337fd MP |
301 | enum gpio_lookup_flags *lflags, |
302 | enum gpiod_flags *dflags) | |
f625d460 BP |
303 | { |
304 | struct device_node *chip_np; | |
305 | enum of_gpio_flags xlate_flags; | |
be715343 MY |
306 | struct of_phandle_args gpiospec; |
307 | struct gpio_desc *desc; | |
a79fead5 | 308 | unsigned int i; |
f625d460 | 309 | u32 tmp; |
3f9547e1 | 310 | int ret; |
f625d460 | 311 | |
be715343 | 312 | chip_np = chip->of_node; |
f625d460 BP |
313 | if (!chip_np) |
314 | return ERR_PTR(-EINVAL); | |
315 | ||
316 | xlate_flags = 0; | |
317 | *lflags = 0; | |
318 | *dflags = 0; | |
319 | ||
320 | ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp); | |
321 | if (ret) | |
322 | return ERR_PTR(ret); | |
323 | ||
be715343 MY |
324 | gpiospec.np = chip_np; |
325 | gpiospec.args_count = tmp; | |
f625d460 | 326 | |
a79fead5 GU |
327 | for (i = 0; i < tmp; i++) { |
328 | ret = of_property_read_u32_index(np, "gpios", idx * tmp + i, | |
329 | &gpiospec.args[i]); | |
330 | if (ret) | |
331 | return ERR_PTR(ret); | |
332 | } | |
f625d460 | 333 | |
99468c1a | 334 | desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags); |
be715343 MY |
335 | if (IS_ERR(desc)) |
336 | return desc; | |
f625d460 BP |
337 | |
338 | if (xlate_flags & OF_GPIO_ACTIVE_LOW) | |
339 | *lflags |= GPIO_ACTIVE_LOW; | |
e10f72bf AJ |
340 | if (xlate_flags & OF_GPIO_TRANSITORY) |
341 | *lflags |= GPIO_TRANSITORY; | |
f625d460 BP |
342 | |
343 | if (of_property_read_bool(np, "input")) | |
344 | *dflags |= GPIOD_IN; | |
345 | else if (of_property_read_bool(np, "output-low")) | |
346 | *dflags |= GPIOD_OUT_LOW; | |
347 | else if (of_property_read_bool(np, "output-high")) | |
348 | *dflags |= GPIOD_OUT_HIGH; | |
349 | else { | |
350 | pr_warn("GPIO line %d (%s): no hogging state specified, bailing out\n", | |
be715343 | 351 | desc_to_gpio(desc), np->name); |
f625d460 BP |
352 | return ERR_PTR(-EINVAL); |
353 | } | |
354 | ||
355 | if (name && of_property_read_string(np, "line-name", name)) | |
356 | *name = np->name; | |
357 | ||
be715343 | 358 | return desc; |
f625d460 BP |
359 | } |
360 | ||
361 | /** | |
fd7337fd | 362 | * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions |
f625d460 BP |
363 | * @chip: gpio chip to act on |
364 | * | |
365 | * This is only used by of_gpiochip_add to request/set GPIO initial | |
366 | * configuration. | |
ead066e6 | 367 | * It returns error if it fails otherwise 0 on success. |
f625d460 | 368 | */ |
dfbd379b | 369 | static int of_gpiochip_scan_gpios(struct gpio_chip *chip) |
f625d460 BP |
370 | { |
371 | struct gpio_desc *desc = NULL; | |
372 | struct device_node *np; | |
373 | const char *name; | |
374 | enum gpio_lookup_flags lflags; | |
375 | enum gpiod_flags dflags; | |
a79fead5 | 376 | unsigned int i; |
dfbd379b | 377 | int ret; |
f625d460 | 378 | |
d1279d94 | 379 | for_each_available_child_of_node(chip->of_node, np) { |
f625d460 BP |
380 | if (!of_property_read_bool(np, "gpio-hog")) |
381 | continue; | |
382 | ||
a79fead5 GU |
383 | for (i = 0;; i++) { |
384 | desc = of_parse_own_gpio(np, chip, i, &name, &lflags, | |
385 | &dflags); | |
386 | if (IS_ERR(desc)) | |
387 | break; | |
388 | ||
389 | ret = gpiod_hog(desc, name, lflags, dflags); | |
390 | if (ret < 0) { | |
391 | of_node_put(np); | |
392 | return ret; | |
393 | } | |
09e258af | 394 | } |
f625d460 | 395 | } |
dfbd379b LD |
396 | |
397 | return 0; | |
f625d460 BP |
398 | } |
399 | ||
863fbf49 | 400 | /** |
67049c50 | 401 | * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags |
a19e3da5 | 402 | * @gc: pointer to the gpio_chip structure |
67049c50 | 403 | * @gpiospec: GPIO specifier as found in the device tree |
b908b53d | 404 | * @flags: a flags pointer to fill in |
863fbf49 AV |
405 | * |
406 | * This is simple translation function, suitable for the most 1:1 mapped | |
67049c50 | 407 | * GPIO chips. This function performs only one sanity check: whether GPIO |
863fbf49 AV |
408 | * is less than ngpios (that is specified in the gpio_chip). |
409 | */ | |
15c9a0ac GL |
410 | int of_gpio_simple_xlate(struct gpio_chip *gc, |
411 | const struct of_phandle_args *gpiospec, u32 *flags) | |
863fbf49 | 412 | { |
b908b53d AV |
413 | /* |
414 | * We're discouraging gpio_cells < 2, since that way you'll have to | |
20a8a968 | 415 | * write your own xlate function (that will have to retrieve the GPIO |
b908b53d AV |
416 | * number and the flags from a single gpio cell -- this is possible, |
417 | * but not recommended). | |
418 | */ | |
a19e3da5 | 419 | if (gc->of_gpio_n_cells < 2) { |
b908b53d AV |
420 | WARN_ON(1); |
421 | return -EINVAL; | |
422 | } | |
423 | ||
15c9a0ac GL |
424 | if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) |
425 | return -EINVAL; | |
426 | ||
6270d830 | 427 | if (gpiospec->args[0] >= gc->ngpio) |
863fbf49 AV |
428 | return -EINVAL; |
429 | ||
b908b53d | 430 | if (flags) |
15c9a0ac | 431 | *flags = gpiospec->args[1]; |
b908b53d | 432 | |
15c9a0ac | 433 | return gpiospec->args[0]; |
863fbf49 | 434 | } |
3038bbdf | 435 | EXPORT_SYMBOL(of_gpio_simple_xlate); |
863fbf49 | 436 | |
863fbf49 | 437 | /** |
3208b0f0 | 438 | * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank) |
863fbf49 AV |
439 | * @np: device node of the GPIO chip |
440 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
3208b0f0 | 441 | * @data: driver data to store in the struct gpio_chip |
863fbf49 AV |
442 | * |
443 | * To use this function you should allocate and fill mm_gc with: | |
444 | * | |
445 | * 1) In the gpio_chip structure: | |
446 | * - all the callbacks | |
a19e3da5 AV |
447 | * - of_gpio_n_cells |
448 | * - of_xlate callback (optional) | |
863fbf49 AV |
449 | * |
450 | * 3) In the of_mm_gpio_chip structure: | |
451 | * - save_regs callback (optional) | |
452 | * | |
453 | * If succeeded, this function will map bank's memory and will | |
454 | * do all necessary work for you. Then you'll able to use .regs | |
455 | * to manage GPIOs from the callbacks. | |
456 | */ | |
3208b0f0 LW |
457 | int of_mm_gpiochip_add_data(struct device_node *np, |
458 | struct of_mm_gpio_chip *mm_gc, | |
459 | void *data) | |
863fbf49 AV |
460 | { |
461 | int ret = -ENOMEM; | |
a19e3da5 | 462 | struct gpio_chip *gc = &mm_gc->gc; |
863fbf49 | 463 | |
7eb6ce2f | 464 | gc->label = kasprintf(GFP_KERNEL, "%pOF", np); |
863fbf49 AV |
465 | if (!gc->label) |
466 | goto err0; | |
467 | ||
468 | mm_gc->regs = of_iomap(np, 0); | |
469 | if (!mm_gc->regs) | |
470 | goto err1; | |
471 | ||
21451155 | 472 | gc->base = -1; |
863fbf49 | 473 | |
863fbf49 AV |
474 | if (mm_gc->save_regs) |
475 | mm_gc->save_regs(mm_gc); | |
476 | ||
a19e3da5 | 477 | mm_gc->gc.of_node = np; |
863fbf49 | 478 | |
3208b0f0 | 479 | ret = gpiochip_add_data(gc, data); |
863fbf49 AV |
480 | if (ret) |
481 | goto err2; | |
482 | ||
863fbf49 AV |
483 | return 0; |
484 | err2: | |
863fbf49 AV |
485 | iounmap(mm_gc->regs); |
486 | err1: | |
487 | kfree(gc->label); | |
488 | err0: | |
7eb6ce2f | 489 | pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret); |
863fbf49 AV |
490 | return ret; |
491 | } | |
3208b0f0 | 492 | EXPORT_SYMBOL(of_mm_gpiochip_add_data); |
594fa265 | 493 | |
d621e8ba RRD |
494 | /** |
495 | * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank) | |
496 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
497 | */ | |
498 | void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) | |
499 | { | |
500 | struct gpio_chip *gc = &mm_gc->gc; | |
501 | ||
502 | if (!mm_gc) | |
503 | return; | |
504 | ||
505 | gpiochip_remove(gc); | |
506 | iounmap(mm_gc->regs); | |
507 | kfree(gc->label); | |
508 | } | |
509 | EXPORT_SYMBOL(of_mm_gpiochip_remove); | |
510 | ||
726cb3ba SB |
511 | static void of_gpiochip_init_valid_mask(struct gpio_chip *chip) |
512 | { | |
513 | int len, i; | |
514 | u32 start, count; | |
515 | struct device_node *np = chip->of_node; | |
516 | ||
517 | len = of_property_count_u32_elems(np, "gpio-reserved-ranges"); | |
518 | if (len < 0 || len % 2 != 0) | |
519 | return; | |
520 | ||
521 | for (i = 0; i < len; i += 2) { | |
522 | of_property_read_u32_index(np, "gpio-reserved-ranges", | |
523 | i, &start); | |
524 | of_property_read_u32_index(np, "gpio-reserved-ranges", | |
525 | i + 1, &count); | |
526 | if (start >= chip->ngpio || start + count >= chip->ngpio) | |
527 | continue; | |
528 | ||
529 | bitmap_clear(chip->valid_mask, start, count); | |
530 | } | |
531 | }; | |
532 | ||
f23f1516 | 533 | #ifdef CONFIG_PINCTRL |
28355f81 | 534 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) |
f23f1516 SH |
535 | { |
536 | struct device_node *np = chip->of_node; | |
f23f1516 | 537 | struct of_phandle_args pinspec; |
1e63d7b9 | 538 | struct pinctrl_dev *pctldev; |
f23f1516 | 539 | int index = 0, ret; |
586a87e6 CR |
540 | const char *name; |
541 | static const char group_names_propname[] = "gpio-ranges-group-names"; | |
542 | struct property *group_names; | |
f23f1516 SH |
543 | |
544 | if (!np) | |
28355f81 | 545 | return 0; |
f23f1516 | 546 | |
586a87e6 CR |
547 | group_names = of_find_property(np, group_names_propname, NULL); |
548 | ||
ad4e1a7c | 549 | for (;; index++) { |
d9fe0039 SW |
550 | ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, |
551 | index, &pinspec); | |
f23f1516 SH |
552 | if (ret) |
553 | break; | |
554 | ||
1e63d7b9 | 555 | pctldev = of_pinctrl_get(pinspec.np); |
602cf638 | 556 | of_node_put(pinspec.np); |
1e63d7b9 | 557 | if (!pctldev) |
28355f81 | 558 | return -EPROBE_DEFER; |
f23f1516 | 559 | |
586a87e6 CR |
560 | if (pinspec.args[2]) { |
561 | if (group_names) { | |
72858602 | 562 | of_property_read_string_index(np, |
586a87e6 CR |
563 | group_names_propname, |
564 | index, &name); | |
565 | if (strlen(name)) { | |
7eb6ce2f RH |
566 | pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n", |
567 | np); | |
586a87e6 CR |
568 | break; |
569 | } | |
570 | } | |
571 | /* npins != 0: linear range */ | |
572 | ret = gpiochip_add_pin_range(chip, | |
573 | pinctrl_dev_get_devname(pctldev), | |
574 | pinspec.args[0], | |
575 | pinspec.args[1], | |
576 | pinspec.args[2]); | |
577 | if (ret) | |
28355f81 | 578 | return ret; |
586a87e6 CR |
579 | } else { |
580 | /* npins == 0: special range */ | |
581 | if (pinspec.args[1]) { | |
7eb6ce2f RH |
582 | pr_err("%pOF: Illegal gpio-range format.\n", |
583 | np); | |
586a87e6 CR |
584 | break; |
585 | } | |
586 | ||
587 | if (!group_names) { | |
7eb6ce2f RH |
588 | pr_err("%pOF: GPIO group range requested but no %s property.\n", |
589 | np, group_names_propname); | |
586a87e6 CR |
590 | break; |
591 | } | |
592 | ||
593 | ret = of_property_read_string_index(np, | |
594 | group_names_propname, | |
595 | index, &name); | |
596 | if (ret) | |
597 | break; | |
598 | ||
599 | if (!strlen(name)) { | |
7eb6ce2f RH |
600 | pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n", |
601 | np); | |
586a87e6 CR |
602 | break; |
603 | } | |
604 | ||
605 | ret = gpiochip_add_pingroup_range(chip, pctldev, | |
606 | pinspec.args[0], name); | |
607 | if (ret) | |
28355f81 | 608 | return ret; |
586a87e6 | 609 | } |
ad4e1a7c | 610 | } |
28355f81 TV |
611 | |
612 | return 0; | |
f23f1516 SH |
613 | } |
614 | ||
f23f1516 | 615 | #else |
28355f81 | 616 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } |
f23f1516 SH |
617 | #endif |
618 | ||
28355f81 | 619 | int of_gpiochip_add(struct gpio_chip *chip) |
391c970c | 620 | { |
28355f81 TV |
621 | int status; |
622 | ||
58383c78 LW |
623 | if ((!chip->of_node) && (chip->parent)) |
624 | chip->of_node = chip->parent->of_node; | |
391c970c AV |
625 | |
626 | if (!chip->of_node) | |
28355f81 | 627 | return 0; |
391c970c AV |
628 | |
629 | if (!chip->of_xlate) { | |
630 | chip->of_gpio_n_cells = 2; | |
631 | chip->of_xlate = of_gpio_simple_xlate; | |
632 | } | |
633 | ||
1020dfd1 MY |
634 | if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS) |
635 | return -EINVAL; | |
636 | ||
726cb3ba SB |
637 | of_gpiochip_init_valid_mask(chip); |
638 | ||
28355f81 TV |
639 | status = of_gpiochip_add_pin_range(chip); |
640 | if (status) | |
641 | return status; | |
642 | ||
fd9c5531 LW |
643 | /* If the chip defines names itself, these take precedence */ |
644 | if (!chip->names) | |
82270335 CL |
645 | devprop_gpiochip_set_names(chip, |
646 | of_fwnode_handle(chip->of_node)); | |
fd9c5531 | 647 | |
391c970c | 648 | of_node_get(chip->of_node); |
f625d460 | 649 | |
dfbd379b | 650 | return of_gpiochip_scan_gpios(chip); |
391c970c AV |
651 | } |
652 | ||
653 | void of_gpiochip_remove(struct gpio_chip *chip) | |
654 | { | |
e93fa3f2 | 655 | gpiochip_remove_pin_ranges(chip); |
8a691550 | 656 | of_node_put(chip->of_node); |
391c970c | 657 | } |