Commit | Line | Data |
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27038c3e | 1 | // SPDX-License-Identifier: GPL-2.0+ |
863fbf49 AV |
2 | /* |
3 | * OF helpers for the GPIO API | |
4 | * | |
5 | * Copyright (c) 2007-2008 MontaVista Software, Inc. | |
6 | * | |
7 | * Author: Anton Vorontsov <avorontsov@ru.mvista.com> | |
863fbf49 AV |
8 | */ |
9 | ||
2e13cba8 | 10 | #include <linux/device.h> |
bea4dbee | 11 | #include <linux/err.h> |
863fbf49 | 12 | #include <linux/errno.h> |
2e13cba8 | 13 | #include <linux/module.h> |
863fbf49 | 14 | #include <linux/io.h> |
af8b6375 | 15 | #include <linux/gpio/consumer.h> |
863fbf49 | 16 | #include <linux/of.h> |
2e13cba8 | 17 | #include <linux/of_address.h> |
863fbf49 | 18 | #include <linux/of_gpio.h> |
f23f1516 | 19 | #include <linux/pinctrl/pinctrl.h> |
2e13cba8 | 20 | #include <linux/slab.h> |
f625d460 | 21 | #include <linux/gpio/machine.h> |
863fbf49 | 22 | |
1bd6b601 | 23 | #include "gpiolib.h" |
f626d6df LW |
24 | #include "gpiolib-of.h" |
25 | ||
71b8f600 LW |
26 | /** |
27 | * of_gpio_spi_cs_get_count() - special GPIO counting for SPI | |
c5a66b97 LJ |
28 | * @dev: Consuming device |
29 | * @con_id: Function within the GPIO consumer | |
30 | * | |
71b8f600 | 31 | * Some elder GPIO controllers need special quirks. Currently we handle |
47267732 | 32 | * the Freescale and PPC GPIO controller with bindings that doesn't use the |
71b8f600 LW |
33 | * established "cs-gpios" for chip selects but instead rely on |
34 | * "gpios" for the chip select lines. If we detect this, we redirect | |
35 | * the counting of "cs-gpios" to count "gpios" transparent to the | |
36 | * driver. | |
37 | */ | |
a1f4c96b | 38 | static int of_gpio_spi_cs_get_count(struct device *dev, const char *con_id) |
71b8f600 LW |
39 | { |
40 | struct device_node *np = dev->of_node; | |
41 | ||
42 | if (!IS_ENABLED(CONFIG_SPI_MASTER)) | |
43 | return 0; | |
44 | if (!con_id || strcmp(con_id, "cs")) | |
45 | return 0; | |
46 | if (!of_device_is_compatible(np, "fsl,spi") && | |
47267732 LW |
47 | !of_device_is_compatible(np, "aeroflexgaisler,spictrl") && |
48 | !of_device_is_compatible(np, "ibm,ppc4xx-spi")) | |
71b8f600 LW |
49 | return 0; |
50 | return of_gpio_named_count(np, "gpios"); | |
51 | } | |
52 | ||
f626d6df LW |
53 | /* |
54 | * This is used by external users of of_gpio_count() from <linux/of_gpio.h> | |
55 | * | |
56 | * FIXME: get rid of those external users by converting them to GPIO | |
808b9931 | 57 | * descriptors and let them all use gpiod_count() |
f626d6df LW |
58 | */ |
59 | int of_gpio_get_count(struct device *dev, const char *con_id) | |
60 | { | |
61 | int ret; | |
62 | char propname[32]; | |
63 | unsigned int i; | |
64 | ||
71b8f600 LW |
65 | ret = of_gpio_spi_cs_get_count(dev, con_id); |
66 | if (ret > 0) | |
67 | return ret; | |
68 | ||
f626d6df LW |
69 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
70 | if (con_id) | |
71 | snprintf(propname, sizeof(propname), "%s-%s", | |
72 | con_id, gpio_suffixes[i]); | |
73 | else | |
74 | snprintf(propname, sizeof(propname), "%s", | |
75 | gpio_suffixes[i]); | |
76 | ||
77 | ret = of_gpio_named_count(dev->of_node, propname); | |
78 | if (ret > 0) | |
79 | break; | |
80 | } | |
81 | return ret ? ret : -ENOENT; | |
82 | } | |
af8b6375 | 83 | |
c7e9d398 | 84 | static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data) |
3d0f7cf0 | 85 | { |
c7e9d398 MY |
86 | struct of_phandle_args *gpiospec = data; |
87 | ||
88 | return chip->gpiodev->dev.of_node == gpiospec->np && | |
d49b48f0 | 89 | chip->of_xlate && |
c7e9d398 | 90 | chip->of_xlate(chip, gpiospec, NULL) >= 0; |
762c2e46 | 91 | } |
3d0f7cf0 | 92 | |
c7e9d398 MY |
93 | static struct gpio_chip *of_find_gpiochip_by_xlate( |
94 | struct of_phandle_args *gpiospec) | |
762c2e46 | 95 | { |
c7e9d398 | 96 | return gpiochip_find(gpiospec, of_gpiochip_match_node_and_xlate); |
3d0f7cf0 | 97 | } |
3d0f7cf0 | 98 | |
99468c1a MY |
99 | static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip, |
100 | struct of_phandle_args *gpiospec, | |
101 | enum of_gpio_flags *flags) | |
3d0f7cf0 | 102 | { |
3d0f7cf0 GL |
103 | int ret; |
104 | ||
99468c1a MY |
105 | if (chip->of_gpio_n_cells != gpiospec->args_count) |
106 | return ERR_PTR(-EINVAL); | |
107 | ||
108 | ret = chip->of_xlate(chip, gpiospec, flags); | |
109 | if (ret < 0) | |
110 | return ERR_PTR(ret); | |
111 | ||
112 | return gpiochip_get_desc(chip, ret); | |
3d0f7cf0 GL |
113 | } |
114 | ||
f626d6df LW |
115 | /** |
116 | * of_gpio_need_valid_mask() - figure out if the OF GPIO driver needs | |
117 | * to set the .valid_mask | |
14e8c535 RD |
118 | * @gc: the target gpio_chip |
119 | * | |
120 | * Return: true if the valid mask needs to be set | |
f626d6df | 121 | */ |
49281a22 | 122 | bool of_gpio_need_valid_mask(const struct gpio_chip *gc) |
f626d6df LW |
123 | { |
124 | int size; | |
125 | struct device_node *np = gc->of_node; | |
126 | ||
127 | size = of_property_count_u32_elems(np, "gpio-reserved-ranges"); | |
128 | if (size > 0 && size % 2 == 0) | |
129 | return true; | |
130 | return false; | |
131 | } | |
132 | ||
a603a2b8 | 133 | static void of_gpio_flags_quirks(struct device_node *np, |
89a5e15b | 134 | const char *propname, |
6953c57a LW |
135 | enum of_gpio_flags *flags, |
136 | int index) | |
a603a2b8 LW |
137 | { |
138 | /* | |
139 | * Some GPIO fixed regulator quirks. | |
140 | * Note that active low is the default. | |
141 | */ | |
142 | if (IS_ENABLED(CONFIG_REGULATOR) && | |
906402a4 LW |
143 | (of_device_is_compatible(np, "regulator-fixed") || |
144 | of_device_is_compatible(np, "reg-fixed-voltage") || | |
a71a81e7 GU |
145 | (!(strcmp(propname, "enable-gpio") && |
146 | strcmp(propname, "enable-gpios")) && | |
147 | of_device_is_compatible(np, "regulator-gpio")))) { | |
228fc010 LS |
148 | bool active_low = !of_property_read_bool(np, |
149 | "enable-active-high"); | |
a603a2b8 LW |
150 | /* |
151 | * The regulator GPIO handles are specified such that the | |
152 | * presence or absence of "enable-active-high" solely controls | |
153 | * the polarity of the GPIO line. Any phandle flags must | |
154 | * be actively ignored. | |
155 | */ | |
228fc010 | 156 | if ((*flags & OF_GPIO_ACTIVE_LOW) && !active_low) { |
a603a2b8 LW |
157 | pr_warn("%s GPIO handle specifies active low - ignored\n", |
158 | of_node_full_name(np)); | |
159 | *flags &= ~OF_GPIO_ACTIVE_LOW; | |
160 | } | |
228fc010 | 161 | if (active_low) |
a603a2b8 LW |
162 | *flags |= OF_GPIO_ACTIVE_LOW; |
163 | } | |
164 | /* | |
165 | * Legacy open drain handling for fixed voltage regulators. | |
166 | */ | |
167 | if (IS_ENABLED(CONFIG_REGULATOR) && | |
168 | of_device_is_compatible(np, "reg-fixed-voltage") && | |
169 | of_property_read_bool(np, "gpio-open-drain")) { | |
170 | *flags |= (OF_GPIO_SINGLE_ENDED | OF_GPIO_OPEN_DRAIN); | |
171 | pr_info("%s uses legacy open drain flag - update the DTS if you can\n", | |
172 | of_node_full_name(np)); | |
173 | } | |
6953c57a LW |
174 | |
175 | /* | |
176 | * Legacy handling of SPI active high chip select. If we have a | |
177 | * property named "cs-gpios" we need to inspect the child node | |
178 | * to determine if the flags should have inverted semantics. | |
179 | */ | |
da7f1349 | 180 | if (IS_ENABLED(CONFIG_SPI_MASTER) && !strcmp(propname, "cs-gpios") && |
a71a81e7 | 181 | of_property_read_bool(np, "cs-gpios")) { |
6953c57a LW |
182 | struct device_node *child; |
183 | u32 cs; | |
184 | int ret; | |
185 | ||
186 | for_each_child_of_node(np, child) { | |
187 | ret = of_property_read_u32(child, "reg", &cs); | |
c1c04cea | 188 | if (ret) |
6953c57a LW |
189 | continue; |
190 | if (cs == index) { | |
191 | /* | |
192 | * SPI children have active low chip selects | |
193 | * by default. This can be specified negatively | |
194 | * by just omitting "spi-cs-high" in the | |
195 | * device node, or actively by tagging on | |
196 | * GPIO_ACTIVE_LOW as flag in the device | |
197 | * tree. If the line is simultaneously | |
198 | * tagged as active low in the device tree | |
199 | * and has the "spi-cs-high" set, we get a | |
200 | * conflict and the "spi-cs-high" flag will | |
201 | * take precedence. | |
202 | */ | |
7ce40277 | 203 | if (of_property_read_bool(child, "spi-cs-high")) { |
6953c57a LW |
204 | if (*flags & OF_GPIO_ACTIVE_LOW) { |
205 | pr_warn("%s GPIO handle specifies active low - ignored\n", | |
7ce40277 | 206 | of_node_full_name(child)); |
6953c57a LW |
207 | *flags &= ~OF_GPIO_ACTIVE_LOW; |
208 | } | |
209 | } else { | |
210 | if (!(*flags & OF_GPIO_ACTIVE_LOW)) | |
211 | pr_info("%s enforce active low on chipselect handle\n", | |
7ce40277 | 212 | of_node_full_name(child)); |
6953c57a LW |
213 | *flags |= OF_GPIO_ACTIVE_LOW; |
214 | } | |
89fea04c | 215 | of_node_put(child); |
6953c57a LW |
216 | break; |
217 | } | |
218 | } | |
219 | } | |
edc1ef3f MB |
220 | |
221 | /* Legacy handling of stmmac's active-low PHY reset line */ | |
222 | if (IS_ENABLED(CONFIG_STMMAC_ETH) && | |
223 | !strcmp(propname, "snps,reset-gpio") && | |
224 | of_property_read_bool(np, "snps,reset-active-low")) | |
225 | *flags |= OF_GPIO_ACTIVE_LOW; | |
a603a2b8 LW |
226 | } |
227 | ||
863fbf49 | 228 | /** |
af8b6375 | 229 | * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API |
863fbf49 | 230 | * @np: device node to get GPIO from |
a6b09191 | 231 | * @propname: property name containing gpio specifier(s) |
863fbf49 | 232 | * @index: index of the GPIO |
b908b53d | 233 | * @flags: a flags pointer to fill in |
863fbf49 | 234 | * |
af8b6375 | 235 | * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno |
b908b53d AV |
236 | * value on the error condition. If @flags is not NULL the function also fills |
237 | * in flags for the GPIO. | |
863fbf49 | 238 | */ |
c83d3c77 | 239 | static struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, |
af8b6375 | 240 | const char *propname, int index, enum of_gpio_flags *flags) |
863fbf49 | 241 | { |
762c2e46 MY |
242 | struct of_phandle_args gpiospec; |
243 | struct gpio_chip *chip; | |
244 | struct gpio_desc *desc; | |
64b60e09 | 245 | int ret; |
3d0f7cf0 | 246 | |
c11e6f0f SB |
247 | ret = of_parse_phandle_with_args_map(np, propname, "gpio", index, |
248 | &gpiospec); | |
64b60e09 | 249 | if (ret) { |
7eb6ce2f RH |
250 | pr_debug("%s: can't parse '%s' property of node '%pOF[%d]'\n", |
251 | __func__, propname, np, index); | |
af8b6375 | 252 | return ERR_PTR(ret); |
863fbf49 AV |
253 | } |
254 | ||
c7e9d398 | 255 | chip = of_find_gpiochip_by_xlate(&gpiospec); |
762c2e46 MY |
256 | if (!chip) { |
257 | desc = ERR_PTR(-EPROBE_DEFER); | |
258 | goto out; | |
259 | } | |
762c2e46 | 260 | |
99468c1a | 261 | desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, flags); |
762c2e46 MY |
262 | if (IS_ERR(desc)) |
263 | goto out; | |
863fbf49 | 264 | |
605f2d34 | 265 | if (flags) |
89a5e15b | 266 | of_gpio_flags_quirks(np, propname, flags, index); |
a603a2b8 | 267 | |
7eb6ce2f RH |
268 | pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n", |
269 | __func__, propname, np, index, | |
762c2e46 MY |
270 | PTR_ERR_OR_ZERO(desc)); |
271 | ||
272 | out: | |
273 | of_node_put(gpiospec.np); | |
274 | ||
275 | return desc; | |
863fbf49 | 276 | } |
863fbf49 | 277 | |
f01d9075 AC |
278 | int of_get_named_gpio_flags(struct device_node *np, const char *list_name, |
279 | int index, enum of_gpio_flags *flags) | |
280 | { | |
281 | struct gpio_desc *desc; | |
282 | ||
283 | desc = of_get_named_gpiod_flags(np, list_name, index, flags); | |
284 | ||
285 | if (IS_ERR(desc)) | |
286 | return PTR_ERR(desc); | |
287 | else | |
288 | return desc_to_gpio(desc); | |
289 | } | |
6d662455 | 290 | EXPORT_SYMBOL_GPL(of_get_named_gpio_flags); |
f01d9075 | 291 | |
f626d6df LW |
292 | /** |
293 | * gpiod_get_from_of_node() - obtain a GPIO from an OF node | |
294 | * @node: handle of the OF node | |
295 | * @propname: name of the DT property representing the GPIO | |
296 | * @index: index of the GPIO to obtain for the consumer | |
297 | * @dflags: GPIO initialization flags | |
298 | * @label: label to attach to the requested GPIO | |
299 | * | |
300 | * Returns: | |
301 | * On successful request the GPIO pin is configured in accordance with | |
302 | * provided @dflags. | |
303 | * | |
304 | * In case of error an ERR_PTR() is returned. | |
305 | */ | |
306 | struct gpio_desc *gpiod_get_from_of_node(struct device_node *node, | |
307 | const char *propname, int index, | |
308 | enum gpiod_flags dflags, | |
309 | const char *label) | |
310 | { | |
311 | unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; | |
312 | struct gpio_desc *desc; | |
313 | enum of_gpio_flags flags; | |
314 | bool active_low = false; | |
315 | bool single_ended = false; | |
316 | bool open_drain = false; | |
317 | bool transitory = false; | |
318 | int ret; | |
319 | ||
320 | desc = of_get_named_gpiod_flags(node, propname, | |
321 | index, &flags); | |
322 | ||
323 | if (!desc || IS_ERR(desc)) { | |
324 | return desc; | |
325 | } | |
326 | ||
327 | active_low = flags & OF_GPIO_ACTIVE_LOW; | |
328 | single_ended = flags & OF_GPIO_SINGLE_ENDED; | |
329 | open_drain = flags & OF_GPIO_OPEN_DRAIN; | |
330 | transitory = flags & OF_GPIO_TRANSITORY; | |
331 | ||
332 | ret = gpiod_request(desc, label); | |
be7ae45c | 333 | if (ret == -EBUSY && (dflags & GPIOD_FLAGS_BIT_NONEXCLUSIVE)) |
f626d6df LW |
334 | return desc; |
335 | if (ret) | |
336 | return ERR_PTR(ret); | |
337 | ||
338 | if (active_low) | |
339 | lflags |= GPIO_ACTIVE_LOW; | |
340 | ||
341 | if (single_ended) { | |
342 | if (open_drain) | |
343 | lflags |= GPIO_OPEN_DRAIN; | |
344 | else | |
345 | lflags |= GPIO_OPEN_SOURCE; | |
346 | } | |
347 | ||
348 | if (transitory) | |
349 | lflags |= GPIO_TRANSITORY; | |
350 | ||
ea06a482 AF |
351 | if (flags & OF_GPIO_PULL_UP) |
352 | lflags |= GPIO_PULL_UP; | |
353 | ||
354 | if (flags & OF_GPIO_PULL_DOWN) | |
355 | lflags |= GPIO_PULL_DOWN; | |
356 | ||
f626d6df LW |
357 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); |
358 | if (ret < 0) { | |
359 | gpiod_put(desc); | |
360 | return ERR_PTR(ret); | |
361 | } | |
362 | ||
363 | return desc; | |
364 | } | |
6d662455 | 365 | EXPORT_SYMBOL_GPL(gpiod_get_from_of_node); |
f01d9075 | 366 | |
c8582339 LW |
367 | /* |
368 | * The SPI GPIO bindings happened before we managed to establish that GPIO | |
369 | * properties should be named "foo-gpios" so we have this special kludge for | |
370 | * them. | |
371 | */ | |
372 | static struct gpio_desc *of_find_spi_gpio(struct device *dev, const char *con_id, | |
373 | enum of_gpio_flags *of_flags) | |
374 | { | |
375 | char prop_name[32]; /* 32 is max size of property name */ | |
376 | struct device_node *np = dev->of_node; | |
377 | struct gpio_desc *desc; | |
378 | ||
379 | /* | |
380 | * Hopefully the compiler stubs the rest of the function if this | |
381 | * is false. | |
382 | */ | |
383 | if (!IS_ENABLED(CONFIG_SPI_MASTER)) | |
384 | return ERR_PTR(-ENOENT); | |
385 | ||
386 | /* Allow this specifically for "spi-gpio" devices */ | |
387 | if (!of_device_is_compatible(np, "spi-gpio") || !con_id) | |
388 | return ERR_PTR(-ENOENT); | |
389 | ||
390 | /* Will be "gpio-sck", "gpio-mosi" or "gpio-miso" */ | |
391 | snprintf(prop_name, sizeof(prop_name), "%s-%s", "gpio", con_id); | |
392 | ||
393 | desc = of_get_named_gpiod_flags(np, prop_name, 0, of_flags); | |
394 | return desc; | |
395 | } | |
396 | ||
e3023bf8 LW |
397 | /* |
398 | * The old Freescale bindings use simply "gpios" as name for the chip select | |
399 | * lines rather than "cs-gpios" like all other SPI hardware. Account for this | |
400 | * with a special quirk. | |
401 | */ | |
402 | static struct gpio_desc *of_find_spi_cs_gpio(struct device *dev, | |
403 | const char *con_id, | |
404 | unsigned int idx, | |
405 | unsigned long *flags) | |
406 | { | |
407 | struct device_node *np = dev->of_node; | |
408 | ||
409 | if (!IS_ENABLED(CONFIG_SPI_MASTER)) | |
410 | return ERR_PTR(-ENOENT); | |
411 | ||
47267732 | 412 | /* Allow this specifically for Freescale and PPC devices */ |
e3023bf8 | 413 | if (!of_device_is_compatible(np, "fsl,spi") && |
47267732 LW |
414 | !of_device_is_compatible(np, "aeroflexgaisler,spictrl") && |
415 | !of_device_is_compatible(np, "ibm,ppc4xx-spi")) | |
e3023bf8 LW |
416 | return ERR_PTR(-ENOENT); |
417 | /* Allow only if asking for "cs-gpios" */ | |
418 | if (!con_id || strcmp(con_id, "cs")) | |
419 | return ERR_PTR(-ENOENT); | |
420 | ||
421 | /* | |
422 | * While all other SPI controllers use "cs-gpios" the Freescale | |
423 | * uses just "gpios" so translate to that when "cs-gpios" is | |
424 | * requested. | |
425 | */ | |
426 | return of_find_gpio(dev, NULL, idx, flags); | |
427 | } | |
428 | ||
6a537d48 LW |
429 | /* |
430 | * Some regulator bindings happened before we managed to establish that GPIO | |
431 | * properties should be named "foo-gpios" so we have this special kludge for | |
432 | * them. | |
433 | */ | |
434 | static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *con_id, | |
435 | enum of_gpio_flags *of_flags) | |
436 | { | |
437 | /* These are the connection IDs we accept as legacy GPIO phandles */ | |
438 | const char *whitelist[] = { | |
439 | "wlf,ldoena", /* Arizona */ | |
440 | "wlf,ldo1ena", /* WM8994 */ | |
441 | "wlf,ldo2ena", /* WM8994 */ | |
442 | }; | |
443 | struct device_node *np = dev->of_node; | |
444 | struct gpio_desc *desc; | |
445 | int i; | |
446 | ||
447 | if (!IS_ENABLED(CONFIG_REGULATOR)) | |
448 | return ERR_PTR(-ENOENT); | |
449 | ||
450 | if (!con_id) | |
451 | return ERR_PTR(-ENOENT); | |
452 | ||
4b21f94a AS |
453 | i = match_string(whitelist, ARRAY_SIZE(whitelist), con_id); |
454 | if (i < 0) | |
6a537d48 LW |
455 | return ERR_PTR(-ENOENT); |
456 | ||
457 | desc = of_get_named_gpiod_flags(np, con_id, 0, of_flags); | |
458 | return desc; | |
459 | } | |
460 | ||
11c43bb0 DT |
461 | static struct gpio_desc *of_find_arizona_gpio(struct device *dev, |
462 | const char *con_id, | |
463 | enum of_gpio_flags *of_flags) | |
464 | { | |
465 | if (!IS_ENABLED(CONFIG_MFD_ARIZONA)) | |
466 | return ERR_PTR(-ENOENT); | |
467 | ||
468 | if (!con_id || strcmp(con_id, "wlf,reset")) | |
469 | return ERR_PTR(-ENOENT); | |
470 | ||
471 | return of_get_named_gpiod_flags(dev->of_node, con_id, 0, of_flags); | |
472 | } | |
473 | ||
6e24826d LW |
474 | static struct gpio_desc *of_find_usb_gpio(struct device *dev, |
475 | const char *con_id, | |
476 | enum of_gpio_flags *of_flags) | |
477 | { | |
478 | /* | |
479 | * Currently this USB quirk is only for the Fairchild FUSB302 host which is using | |
480 | * an undocumented DT GPIO line named "fcs,int_n" without the compulsory "-gpios" | |
481 | * suffix. | |
482 | */ | |
483 | if (!IS_ENABLED(CONFIG_TYPEC_FUSB302)) | |
484 | return ERR_PTR(-ENOENT); | |
485 | ||
486 | if (!con_id || strcmp(con_id, "fcs,int_n")) | |
487 | return ERR_PTR(-ENOENT); | |
488 | ||
489 | return of_get_named_gpiod_flags(dev->of_node, con_id, 0, of_flags); | |
490 | } | |
491 | ||
ea713bc4 | 492 | struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, |
fed7026a | 493 | unsigned int idx, unsigned long *flags) |
ea713bc4 LW |
494 | { |
495 | char prop_name[32]; /* 32 is max size of property name */ | |
496 | enum of_gpio_flags of_flags; | |
497 | struct gpio_desc *desc; | |
498 | unsigned int i; | |
499 | ||
c8582339 | 500 | /* Try GPIO property "foo-gpios" and "foo-gpio" */ |
ea713bc4 LW |
501 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
502 | if (con_id) | |
503 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, | |
504 | gpio_suffixes[i]); | |
505 | else | |
506 | snprintf(prop_name, sizeof(prop_name), "%s", | |
507 | gpio_suffixes[i]); | |
508 | ||
509 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, | |
510 | &of_flags); | |
6662ae6a | 511 | |
7b58696d | 512 | if (!gpiod_not_found(desc)) |
ea713bc4 LW |
513 | break; |
514 | } | |
515 | ||
7b58696d | 516 | if (gpiod_not_found(desc)) { |
1dea33e8 | 517 | /* Special handling for SPI GPIOs if used */ |
c8582339 | 518 | desc = of_find_spi_gpio(dev, con_id, &of_flags); |
1dea33e8 DT |
519 | } |
520 | ||
7b58696d | 521 | if (gpiod_not_found(desc)) { |
e3023bf8 LW |
522 | /* This quirk looks up flags and all */ |
523 | desc = of_find_spi_cs_gpio(dev, con_id, idx, flags); | |
524 | if (!IS_ERR(desc)) | |
525 | return desc; | |
526 | } | |
c8582339 | 527 | |
7b58696d | 528 | if (gpiod_not_found(desc)) { |
1dea33e8 | 529 | /* Special handling for regulator GPIOs if used */ |
6a537d48 | 530 | desc = of_find_regulator_gpio(dev, con_id, &of_flags); |
1dea33e8 | 531 | } |
6a537d48 | 532 | |
7b58696d | 533 | if (gpiod_not_found(desc)) |
11c43bb0 DT |
534 | desc = of_find_arizona_gpio(dev, con_id, &of_flags); |
535 | ||
7b58696d | 536 | if (gpiod_not_found(desc)) |
6e24826d LW |
537 | desc = of_find_usb_gpio(dev, con_id, &of_flags); |
538 | ||
ea713bc4 LW |
539 | if (IS_ERR(desc)) |
540 | return desc; | |
541 | ||
542 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
543 | *flags |= GPIO_ACTIVE_LOW; | |
544 | ||
545 | if (of_flags & OF_GPIO_SINGLE_ENDED) { | |
4c0facdd | 546 | if (of_flags & OF_GPIO_OPEN_DRAIN) |
ea713bc4 LW |
547 | *flags |= GPIO_OPEN_DRAIN; |
548 | else | |
549 | *flags |= GPIO_OPEN_SOURCE; | |
550 | } | |
551 | ||
e10f72bf AJ |
552 | if (of_flags & OF_GPIO_TRANSITORY) |
553 | *flags |= GPIO_TRANSITORY; | |
05f479bf | 554 | |
d449991c TP |
555 | if (of_flags & OF_GPIO_PULL_UP) |
556 | *flags |= GPIO_PULL_UP; | |
557 | if (of_flags & OF_GPIO_PULL_DOWN) | |
558 | *flags |= GPIO_PULL_DOWN; | |
559 | ||
ea713bc4 LW |
560 | return desc; |
561 | } | |
562 | ||
f625d460 | 563 | /** |
fd7337fd | 564 | * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API |
f625d460 | 565 | * @np: device node to get GPIO from |
be715343 | 566 | * @chip: GPIO chip whose hog is parsed |
a79fead5 | 567 | * @idx: Index of the GPIO to parse |
f625d460 | 568 | * @name: GPIO line name |
fed7026a AS |
569 | * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from |
570 | * of_find_gpio() or of_parse_own_gpio() | |
f625d460 BP |
571 | * @dflags: gpiod_flags - optional GPIO initialization flags |
572 | * | |
573 | * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno | |
574 | * value on the error condition. | |
575 | */ | |
fd7337fd | 576 | static struct gpio_desc *of_parse_own_gpio(struct device_node *np, |
be715343 | 577 | struct gpio_chip *chip, |
a79fead5 | 578 | unsigned int idx, const char **name, |
fed7026a | 579 | unsigned long *lflags, |
fd7337fd | 580 | enum gpiod_flags *dflags) |
f625d460 BP |
581 | { |
582 | struct device_node *chip_np; | |
583 | enum of_gpio_flags xlate_flags; | |
be715343 MY |
584 | struct of_phandle_args gpiospec; |
585 | struct gpio_desc *desc; | |
a79fead5 | 586 | unsigned int i; |
f625d460 | 587 | u32 tmp; |
3f9547e1 | 588 | int ret; |
f625d460 | 589 | |
be715343 | 590 | chip_np = chip->of_node; |
f625d460 BP |
591 | if (!chip_np) |
592 | return ERR_PTR(-EINVAL); | |
593 | ||
594 | xlate_flags = 0; | |
2d6c06f5 | 595 | *lflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
40941954 | 596 | *dflags = GPIOD_ASIS; |
f625d460 BP |
597 | |
598 | ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp); | |
599 | if (ret) | |
600 | return ERR_PTR(ret); | |
601 | ||
be715343 MY |
602 | gpiospec.np = chip_np; |
603 | gpiospec.args_count = tmp; | |
f625d460 | 604 | |
a79fead5 GU |
605 | for (i = 0; i < tmp; i++) { |
606 | ret = of_property_read_u32_index(np, "gpios", idx * tmp + i, | |
607 | &gpiospec.args[i]); | |
608 | if (ret) | |
609 | return ERR_PTR(ret); | |
610 | } | |
f625d460 | 611 | |
99468c1a | 612 | desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags); |
be715343 MY |
613 | if (IS_ERR(desc)) |
614 | return desc; | |
f625d460 BP |
615 | |
616 | if (xlate_flags & OF_GPIO_ACTIVE_LOW) | |
617 | *lflags |= GPIO_ACTIVE_LOW; | |
e10f72bf AJ |
618 | if (xlate_flags & OF_GPIO_TRANSITORY) |
619 | *lflags |= GPIO_TRANSITORY; | |
ea06a482 AF |
620 | if (xlate_flags & OF_GPIO_PULL_UP) |
621 | *lflags |= GPIO_PULL_UP; | |
622 | if (xlate_flags & OF_GPIO_PULL_DOWN) | |
623 | *lflags |= GPIO_PULL_DOWN; | |
f625d460 BP |
624 | |
625 | if (of_property_read_bool(np, "input")) | |
626 | *dflags |= GPIOD_IN; | |
627 | else if (of_property_read_bool(np, "output-low")) | |
628 | *dflags |= GPIOD_OUT_LOW; | |
629 | else if (of_property_read_bool(np, "output-high")) | |
630 | *dflags |= GPIOD_OUT_HIGH; | |
631 | else { | |
62cdcb6c RH |
632 | pr_warn("GPIO line %d (%pOFn): no hogging state specified, bailing out\n", |
633 | desc_to_gpio(desc), np); | |
f625d460 BP |
634 | return ERR_PTR(-EINVAL); |
635 | } | |
636 | ||
637 | if (name && of_property_read_string(np, "line-name", name)) | |
638 | *name = np->name; | |
639 | ||
be715343 | 640 | return desc; |
f625d460 BP |
641 | } |
642 | ||
bc21077e GU |
643 | /** |
644 | * of_gpiochip_add_hog - Add all hogs in a hog device node | |
645 | * @chip: gpio chip to act on | |
646 | * @hog: device node describing the hogs | |
647 | * | |
648 | * Returns error if it fails otherwise 0 on success. | |
649 | */ | |
650 | static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog) | |
651 | { | |
652 | enum gpiod_flags dflags; | |
653 | struct gpio_desc *desc; | |
654 | unsigned long lflags; | |
655 | const char *name; | |
656 | unsigned int i; | |
657 | int ret; | |
658 | ||
659 | for (i = 0;; i++) { | |
660 | desc = of_parse_own_gpio(hog, chip, i, &name, &lflags, &dflags); | |
661 | if (IS_ERR(desc)) | |
662 | break; | |
663 | ||
664 | ret = gpiod_hog(desc, name, lflags, dflags); | |
665 | if (ret < 0) | |
666 | return ret; | |
63636d95 GU |
667 | |
668 | #ifdef CONFIG_OF_DYNAMIC | |
669 | desc->hog = hog; | |
670 | #endif | |
bc21077e GU |
671 | } |
672 | ||
673 | return 0; | |
674 | } | |
675 | ||
f625d460 | 676 | /** |
fd7337fd | 677 | * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions |
f625d460 BP |
678 | * @chip: gpio chip to act on |
679 | * | |
680 | * This is only used by of_gpiochip_add to request/set GPIO initial | |
681 | * configuration. | |
ead066e6 | 682 | * It returns error if it fails otherwise 0 on success. |
f625d460 | 683 | */ |
dfbd379b | 684 | static int of_gpiochip_scan_gpios(struct gpio_chip *chip) |
f625d460 | 685 | { |
f625d460 | 686 | struct device_node *np; |
dfbd379b | 687 | int ret; |
f625d460 | 688 | |
d1279d94 | 689 | for_each_available_child_of_node(chip->of_node, np) { |
f625d460 BP |
690 | if (!of_property_read_bool(np, "gpio-hog")) |
691 | continue; | |
692 | ||
bc21077e GU |
693 | ret = of_gpiochip_add_hog(chip, np); |
694 | if (ret < 0) { | |
695 | of_node_put(np); | |
696 | return ret; | |
09e258af | 697 | } |
63636d95 GU |
698 | |
699 | of_node_set_flag(np, OF_POPULATED); | |
f625d460 | 700 | } |
dfbd379b LD |
701 | |
702 | return 0; | |
f625d460 BP |
703 | } |
704 | ||
63636d95 GU |
705 | #ifdef CONFIG_OF_DYNAMIC |
706 | /** | |
707 | * of_gpiochip_remove_hog - Remove all hogs in a hog device node | |
708 | * @chip: gpio chip to act on | |
709 | * @hog: device node describing the hogs | |
710 | */ | |
711 | static void of_gpiochip_remove_hog(struct gpio_chip *chip, | |
712 | struct device_node *hog) | |
713 | { | |
714 | struct gpio_desc *descs = chip->gpiodev->descs; | |
715 | unsigned int i; | |
716 | ||
717 | for (i = 0; i < chip->ngpio; i++) { | |
718 | if (test_bit(FLAG_IS_HOGGED, &descs[i].flags) && | |
719 | descs[i].hog == hog) | |
720 | gpiochip_free_own_desc(&descs[i]); | |
721 | } | |
722 | } | |
723 | ||
724 | static int of_gpiochip_match_node(struct gpio_chip *chip, void *data) | |
725 | { | |
726 | return chip->gpiodev->dev.of_node == data; | |
727 | } | |
728 | ||
729 | static struct gpio_chip *of_find_gpiochip_by_node(struct device_node *np) | |
730 | { | |
731 | return gpiochip_find(np, of_gpiochip_match_node); | |
732 | } | |
733 | ||
734 | static int of_gpio_notify(struct notifier_block *nb, unsigned long action, | |
735 | void *arg) | |
736 | { | |
737 | struct of_reconfig_data *rd = arg; | |
738 | struct gpio_chip *chip; | |
739 | int ret; | |
740 | ||
741 | /* | |
742 | * This only supports adding and removing complete gpio-hog nodes. | |
743 | * Modifying an existing gpio-hog node is not supported (except for | |
744 | * changing its "status" property, which is treated the same as | |
745 | * addition/removal). | |
746 | */ | |
747 | switch (of_reconfig_get_state_change(action, arg)) { | |
748 | case OF_RECONFIG_CHANGE_ADD: | |
749 | if (!of_property_read_bool(rd->dn, "gpio-hog")) | |
750 | return NOTIFY_OK; /* not for us */ | |
751 | ||
752 | if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) | |
753 | return NOTIFY_OK; | |
754 | ||
755 | chip = of_find_gpiochip_by_node(rd->dn->parent); | |
756 | if (chip == NULL) | |
757 | return NOTIFY_OK; /* not for us */ | |
758 | ||
759 | ret = of_gpiochip_add_hog(chip, rd->dn); | |
760 | if (ret < 0) { | |
761 | pr_err("%s: failed to add hogs for %pOF\n", __func__, | |
762 | rd->dn); | |
763 | of_node_clear_flag(rd->dn, OF_POPULATED); | |
764 | return notifier_from_errno(ret); | |
765 | } | |
766 | break; | |
767 | ||
768 | case OF_RECONFIG_CHANGE_REMOVE: | |
769 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) | |
770 | return NOTIFY_OK; /* already depopulated */ | |
771 | ||
772 | chip = of_find_gpiochip_by_node(rd->dn->parent); | |
773 | if (chip == NULL) | |
774 | return NOTIFY_OK; /* not for us */ | |
775 | ||
776 | of_gpiochip_remove_hog(chip, rd->dn); | |
777 | of_node_clear_flag(rd->dn, OF_POPULATED); | |
778 | break; | |
779 | } | |
780 | ||
781 | return NOTIFY_OK; | |
782 | } | |
783 | ||
784 | struct notifier_block gpio_of_notifier = { | |
785 | .notifier_call = of_gpio_notify, | |
786 | }; | |
787 | #endif /* CONFIG_OF_DYNAMIC */ | |
788 | ||
863fbf49 | 789 | /** |
67049c50 | 790 | * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags |
a19e3da5 | 791 | * @gc: pointer to the gpio_chip structure |
67049c50 | 792 | * @gpiospec: GPIO specifier as found in the device tree |
b908b53d | 793 | * @flags: a flags pointer to fill in |
863fbf49 AV |
794 | * |
795 | * This is simple translation function, suitable for the most 1:1 mapped | |
67049c50 | 796 | * GPIO chips. This function performs only one sanity check: whether GPIO |
863fbf49 AV |
797 | * is less than ngpios (that is specified in the gpio_chip). |
798 | */ | |
b0c7e73b GU |
799 | static int of_gpio_simple_xlate(struct gpio_chip *gc, |
800 | const struct of_phandle_args *gpiospec, | |
801 | u32 *flags) | |
863fbf49 | 802 | { |
b908b53d AV |
803 | /* |
804 | * We're discouraging gpio_cells < 2, since that way you'll have to | |
20a8a968 | 805 | * write your own xlate function (that will have to retrieve the GPIO |
b908b53d AV |
806 | * number and the flags from a single gpio cell -- this is possible, |
807 | * but not recommended). | |
808 | */ | |
a19e3da5 | 809 | if (gc->of_gpio_n_cells < 2) { |
b908b53d AV |
810 | WARN_ON(1); |
811 | return -EINVAL; | |
812 | } | |
813 | ||
15c9a0ac GL |
814 | if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) |
815 | return -EINVAL; | |
816 | ||
6270d830 | 817 | if (gpiospec->args[0] >= gc->ngpio) |
863fbf49 AV |
818 | return -EINVAL; |
819 | ||
b908b53d | 820 | if (flags) |
15c9a0ac | 821 | *flags = gpiospec->args[1]; |
b908b53d | 822 | |
15c9a0ac | 823 | return gpiospec->args[0]; |
863fbf49 | 824 | } |
863fbf49 | 825 | |
863fbf49 | 826 | /** |
3208b0f0 | 827 | * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank) |
863fbf49 AV |
828 | * @np: device node of the GPIO chip |
829 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
3208b0f0 | 830 | * @data: driver data to store in the struct gpio_chip |
863fbf49 AV |
831 | * |
832 | * To use this function you should allocate and fill mm_gc with: | |
833 | * | |
834 | * 1) In the gpio_chip structure: | |
835 | * - all the callbacks | |
a19e3da5 AV |
836 | * - of_gpio_n_cells |
837 | * - of_xlate callback (optional) | |
863fbf49 AV |
838 | * |
839 | * 3) In the of_mm_gpio_chip structure: | |
840 | * - save_regs callback (optional) | |
841 | * | |
842 | * If succeeded, this function will map bank's memory and will | |
843 | * do all necessary work for you. Then you'll able to use .regs | |
844 | * to manage GPIOs from the callbacks. | |
845 | */ | |
3208b0f0 LW |
846 | int of_mm_gpiochip_add_data(struct device_node *np, |
847 | struct of_mm_gpio_chip *mm_gc, | |
848 | void *data) | |
863fbf49 AV |
849 | { |
850 | int ret = -ENOMEM; | |
a19e3da5 | 851 | struct gpio_chip *gc = &mm_gc->gc; |
863fbf49 | 852 | |
7eb6ce2f | 853 | gc->label = kasprintf(GFP_KERNEL, "%pOF", np); |
863fbf49 AV |
854 | if (!gc->label) |
855 | goto err0; | |
856 | ||
857 | mm_gc->regs = of_iomap(np, 0); | |
858 | if (!mm_gc->regs) | |
859 | goto err1; | |
860 | ||
21451155 | 861 | gc->base = -1; |
863fbf49 | 862 | |
863fbf49 AV |
863 | if (mm_gc->save_regs) |
864 | mm_gc->save_regs(mm_gc); | |
865 | ||
a19e3da5 | 866 | mm_gc->gc.of_node = np; |
863fbf49 | 867 | |
3208b0f0 | 868 | ret = gpiochip_add_data(gc, data); |
863fbf49 AV |
869 | if (ret) |
870 | goto err2; | |
871 | ||
863fbf49 AV |
872 | return 0; |
873 | err2: | |
863fbf49 AV |
874 | iounmap(mm_gc->regs); |
875 | err1: | |
876 | kfree(gc->label); | |
877 | err0: | |
7eb6ce2f | 878 | pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret); |
863fbf49 AV |
879 | return ret; |
880 | } | |
6d662455 | 881 | EXPORT_SYMBOL_GPL(of_mm_gpiochip_add_data); |
594fa265 | 882 | |
d621e8ba RRD |
883 | /** |
884 | * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank) | |
885 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
886 | */ | |
887 | void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) | |
888 | { | |
889 | struct gpio_chip *gc = &mm_gc->gc; | |
890 | ||
891 | if (!mm_gc) | |
892 | return; | |
893 | ||
894 | gpiochip_remove(gc); | |
895 | iounmap(mm_gc->regs); | |
896 | kfree(gc->label); | |
897 | } | |
6d662455 | 898 | EXPORT_SYMBOL_GPL(of_mm_gpiochip_remove); |
d621e8ba | 899 | |
726cb3ba SB |
900 | static void of_gpiochip_init_valid_mask(struct gpio_chip *chip) |
901 | { | |
902 | int len, i; | |
903 | u32 start, count; | |
904 | struct device_node *np = chip->of_node; | |
905 | ||
906 | len = of_property_count_u32_elems(np, "gpio-reserved-ranges"); | |
907 | if (len < 0 || len % 2 != 0) | |
908 | return; | |
909 | ||
910 | for (i = 0; i < len; i += 2) { | |
911 | of_property_read_u32_index(np, "gpio-reserved-ranges", | |
912 | i, &start); | |
913 | of_property_read_u32_index(np, "gpio-reserved-ranges", | |
914 | i + 1, &count); | |
915 | if (start >= chip->ngpio || start + count >= chip->ngpio) | |
916 | continue; | |
917 | ||
918 | bitmap_clear(chip->valid_mask, start, count); | |
919 | } | |
920 | }; | |
921 | ||
f23f1516 | 922 | #ifdef CONFIG_PINCTRL |
28355f81 | 923 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) |
f23f1516 SH |
924 | { |
925 | struct device_node *np = chip->of_node; | |
f23f1516 | 926 | struct of_phandle_args pinspec; |
1e63d7b9 | 927 | struct pinctrl_dev *pctldev; |
f23f1516 | 928 | int index = 0, ret; |
586a87e6 CR |
929 | const char *name; |
930 | static const char group_names_propname[] = "gpio-ranges-group-names"; | |
931 | struct property *group_names; | |
f23f1516 SH |
932 | |
933 | if (!np) | |
28355f81 | 934 | return 0; |
f23f1516 | 935 | |
586a87e6 CR |
936 | group_names = of_find_property(np, group_names_propname, NULL); |
937 | ||
ad4e1a7c | 938 | for (;; index++) { |
d9fe0039 SW |
939 | ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, |
940 | index, &pinspec); | |
f23f1516 SH |
941 | if (ret) |
942 | break; | |
943 | ||
1e63d7b9 | 944 | pctldev = of_pinctrl_get(pinspec.np); |
602cf638 | 945 | of_node_put(pinspec.np); |
1e63d7b9 | 946 | if (!pctldev) |
28355f81 | 947 | return -EPROBE_DEFER; |
f23f1516 | 948 | |
586a87e6 CR |
949 | if (pinspec.args[2]) { |
950 | if (group_names) { | |
72858602 | 951 | of_property_read_string_index(np, |
586a87e6 CR |
952 | group_names_propname, |
953 | index, &name); | |
954 | if (strlen(name)) { | |
7eb6ce2f RH |
955 | pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n", |
956 | np); | |
586a87e6 CR |
957 | break; |
958 | } | |
959 | } | |
960 | /* npins != 0: linear range */ | |
961 | ret = gpiochip_add_pin_range(chip, | |
962 | pinctrl_dev_get_devname(pctldev), | |
963 | pinspec.args[0], | |
964 | pinspec.args[1], | |
965 | pinspec.args[2]); | |
966 | if (ret) | |
28355f81 | 967 | return ret; |
586a87e6 CR |
968 | } else { |
969 | /* npins == 0: special range */ | |
970 | if (pinspec.args[1]) { | |
7eb6ce2f RH |
971 | pr_err("%pOF: Illegal gpio-range format.\n", |
972 | np); | |
586a87e6 CR |
973 | break; |
974 | } | |
975 | ||
976 | if (!group_names) { | |
7eb6ce2f RH |
977 | pr_err("%pOF: GPIO group range requested but no %s property.\n", |
978 | np, group_names_propname); | |
586a87e6 CR |
979 | break; |
980 | } | |
981 | ||
982 | ret = of_property_read_string_index(np, | |
983 | group_names_propname, | |
984 | index, &name); | |
985 | if (ret) | |
986 | break; | |
987 | ||
988 | if (!strlen(name)) { | |
7eb6ce2f RH |
989 | pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n", |
990 | np); | |
586a87e6 CR |
991 | break; |
992 | } | |
993 | ||
994 | ret = gpiochip_add_pingroup_range(chip, pctldev, | |
995 | pinspec.args[0], name); | |
996 | if (ret) | |
28355f81 | 997 | return ret; |
586a87e6 | 998 | } |
ad4e1a7c | 999 | } |
28355f81 TV |
1000 | |
1001 | return 0; | |
f23f1516 SH |
1002 | } |
1003 | ||
f23f1516 | 1004 | #else |
28355f81 | 1005 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } |
f23f1516 SH |
1006 | #endif |
1007 | ||
28355f81 | 1008 | int of_gpiochip_add(struct gpio_chip *chip) |
391c970c | 1009 | { |
f0d1ab05 | 1010 | int ret; |
28355f81 | 1011 | |
391c970c | 1012 | if (!chip->of_node) |
28355f81 | 1013 | return 0; |
391c970c AV |
1014 | |
1015 | if (!chip->of_xlate) { | |
1016 | chip->of_gpio_n_cells = 2; | |
1017 | chip->of_xlate = of_gpio_simple_xlate; | |
1018 | } | |
1019 | ||
1020dfd1 MY |
1020 | if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS) |
1021 | return -EINVAL; | |
1022 | ||
726cb3ba SB |
1023 | of_gpiochip_init_valid_mask(chip); |
1024 | ||
f0d1ab05 LW |
1025 | ret = of_gpiochip_add_pin_range(chip); |
1026 | if (ret) | |
1027 | return ret; | |
28355f81 | 1028 | |
391c970c | 1029 | of_node_get(chip->of_node); |
f625d460 | 1030 | |
f0d1ab05 | 1031 | ret = of_gpiochip_scan_gpios(chip); |
2f4133bb | 1032 | if (ret) |
f7299d44 | 1033 | of_node_put(chip->of_node); |
f7299d44 | 1034 | |
f0d1ab05 | 1035 | return ret; |
391c970c AV |
1036 | } |
1037 | ||
1038 | void of_gpiochip_remove(struct gpio_chip *chip) | |
1039 | { | |
8a691550 | 1040 | of_node_put(chip->of_node); |
391c970c | 1041 | } |
4731210c SK |
1042 | |
1043 | void of_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev) | |
1044 | { | |
1045 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
1046 | if (gc->of_node) | |
1047 | gdev->dev.of_node = gc->of_node; | |
1048 | else | |
1049 | gc->of_node = gdev->dev.of_node; | |
1050 | if (gdev->dev.of_node) | |
1051 | gdev->dev.fwnode = of_fwnode_handle(gdev->dev.of_node); | |
1052 | } |