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; | |
8990899d | 125 | const struct device_node *np = gc->of_node; |
f626d6df LW |
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 | ||
e6ae9a83 | 133 | static void of_gpio_flags_quirks(const 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 | */ |
e6ae9a83 | 239 | static struct gpio_desc *of_get_named_gpiod_flags(const 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 | |
e6ae9a83 | 278 | int of_get_named_gpio_flags(const struct device_node *np, const char *list_name, |
f01d9075 AC |
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 | |
d9e7f0e3 DT |
292 | /* Converts gpio_lookup_flags into bitmask of GPIO_* values */ |
293 | static unsigned long of_convert_gpio_flags(enum of_gpio_flags flags) | |
294 | { | |
295 | unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; | |
296 | ||
297 | if (flags & OF_GPIO_ACTIVE_LOW) | |
298 | lflags |= GPIO_ACTIVE_LOW; | |
299 | ||
300 | if (flags & OF_GPIO_SINGLE_ENDED) { | |
301 | if (flags & OF_GPIO_OPEN_DRAIN) | |
302 | lflags |= GPIO_OPEN_DRAIN; | |
303 | else | |
304 | lflags |= GPIO_OPEN_SOURCE; | |
305 | } | |
306 | ||
307 | if (flags & OF_GPIO_TRANSITORY) | |
308 | lflags |= GPIO_TRANSITORY; | |
309 | ||
310 | if (flags & OF_GPIO_PULL_UP) | |
311 | lflags |= GPIO_PULL_UP; | |
312 | ||
313 | if (flags & OF_GPIO_PULL_DOWN) | |
314 | lflags |= GPIO_PULL_DOWN; | |
315 | ||
316 | if (flags & OF_GPIO_PULL_DISABLE) | |
317 | lflags |= GPIO_PULL_DISABLE; | |
318 | ||
319 | return lflags; | |
320 | } | |
321 | ||
f626d6df LW |
322 | /** |
323 | * gpiod_get_from_of_node() - obtain a GPIO from an OF node | |
324 | * @node: handle of the OF node | |
325 | * @propname: name of the DT property representing the GPIO | |
326 | * @index: index of the GPIO to obtain for the consumer | |
327 | * @dflags: GPIO initialization flags | |
328 | * @label: label to attach to the requested GPIO | |
329 | * | |
330 | * Returns: | |
331 | * On successful request the GPIO pin is configured in accordance with | |
332 | * provided @dflags. | |
333 | * | |
334 | * In case of error an ERR_PTR() is returned. | |
335 | */ | |
e6ae9a83 | 336 | struct gpio_desc *gpiod_get_from_of_node(const struct device_node *node, |
f626d6df LW |
337 | const char *propname, int index, |
338 | enum gpiod_flags dflags, | |
339 | const char *label) | |
340 | { | |
d9e7f0e3 | 341 | unsigned long lflags; |
f626d6df | 342 | struct gpio_desc *desc; |
d9e7f0e3 | 343 | enum of_gpio_flags of_flags; |
f626d6df LW |
344 | int ret; |
345 | ||
d9e7f0e3 DT |
346 | desc = of_get_named_gpiod_flags(node, propname, index, &of_flags); |
347 | if (!desc || IS_ERR(desc)) | |
f626d6df | 348 | return desc; |
f626d6df LW |
349 | |
350 | ret = gpiod_request(desc, label); | |
be7ae45c | 351 | if (ret == -EBUSY && (dflags & GPIOD_FLAGS_BIT_NONEXCLUSIVE)) |
f626d6df LW |
352 | return desc; |
353 | if (ret) | |
354 | return ERR_PTR(ret); | |
355 | ||
d9e7f0e3 | 356 | lflags = of_convert_gpio_flags(of_flags); |
31bea231 | 357 | |
f626d6df LW |
358 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); |
359 | if (ret < 0) { | |
360 | gpiod_put(desc); | |
361 | return ERR_PTR(ret); | |
362 | } | |
363 | ||
364 | return desc; | |
365 | } | |
6d662455 | 366 | EXPORT_SYMBOL_GPL(gpiod_get_from_of_node); |
f01d9075 | 367 | |
b311c5cb | 368 | static struct gpio_desc *of_find_gpio_rename(struct device_node *np, |
e3023bf8 LW |
369 | const char *con_id, |
370 | unsigned int idx, | |
984914ec | 371 | enum of_gpio_flags *of_flags) |
e3023bf8 | 372 | { |
b311c5cb DT |
373 | static const struct of_rename_gpio { |
374 | const char *con_id; | |
375 | const char *legacy_id; /* NULL - same as con_id */ | |
376 | /* | |
377 | * Compatible string can be set to NULL in case where | |
378 | * matching to a particular compatible is not practical, | |
379 | * but it should only be done for gpio names that have | |
380 | * vendor prefix to reduce risk of false positives. | |
381 | * Addition of such entries is strongly discouraged. | |
382 | */ | |
383 | const char *compatible; | |
384 | } gpios[] = { | |
fbbbcd17 DT |
385 | #if !IS_ENABLED(CONFIG_LCD_HX8357) |
386 | /* Himax LCD controllers used "gpios-reset" */ | |
387 | { "reset", "gpios-reset", "himax,hx8357" }, | |
388 | { "reset", "gpios-reset", "himax,hx8369" }, | |
389 | #endif | |
b311c5cb DT |
390 | #if IS_ENABLED(CONFIG_MFD_ARIZONA) |
391 | { "wlf,reset", NULL, NULL }, | |
392 | #endif | |
fbbbcd17 DT |
393 | #if !IS_ENABLED(CONFIG_PCI_LANTIQ) |
394 | /* MIPS Lantiq PCI */ | |
395 | { "reset", "gpios-reset", "lantiq,pci-xway" }, | |
396 | #endif | |
307c593b | 397 | |
b311c5cb DT |
398 | /* |
399 | * Some regulator bindings happened before we managed to | |
400 | * establish that GPIO properties should be named | |
401 | * "foo-gpios" so we have this special kludge for them. | |
402 | */ | |
307c593b | 403 | #if IS_ENABLED(CONFIG_REGULATOR_ARIZONA_LDO1) |
b311c5cb | 404 | { "wlf,ldoena", NULL, NULL }, /* Arizona */ |
307c593b DT |
405 | #endif |
406 | #if IS_ENABLED(CONFIG_REGULATOR_WM8994) | |
b311c5cb DT |
407 | { "wlf,ldo1ena", NULL, NULL }, /* WM8994 */ |
408 | { "wlf,ldo2ena", NULL, NULL }, /* WM8994 */ | |
409 | #endif | |
e3023bf8 | 410 | |
fbbbcd17 DT |
411 | #if IS_ENABLED(CONFIG_SND_SOC_TLV320AIC3X) |
412 | { "reset", "gpio-reset", "ti,tlv320aic3x" }, | |
413 | { "reset", "gpio-reset", "ti,tlv320aic33" }, | |
414 | { "reset", "gpio-reset", "ti,tlv320aic3007" }, | |
415 | { "reset", "gpio-reset", "ti,tlv320aic3104" }, | |
416 | { "reset", "gpio-reset", "ti,tlv320aic3106" }, | |
417 | #endif | |
307c593b | 418 | #if IS_ENABLED(CONFIG_SPI_GPIO) |
b311c5cb DT |
419 | /* |
420 | * The SPI GPIO bindings happened before we managed to | |
421 | * establish that GPIO properties should be named | |
422 | * "foo-gpios" so we have this special kludge for them. | |
423 | */ | |
424 | { "miso", "gpio-miso", "spi-gpio" }, | |
425 | { "mosi", "gpio-mosi", "spi-gpio" }, | |
426 | { "sck", "gpio-sck", "spi-gpio" }, | |
307c593b | 427 | #endif |
e3023bf8 | 428 | |
b311c5cb DT |
429 | /* |
430 | * The old Freescale bindings use simply "gpios" as name | |
431 | * for the chip select lines rather than "cs-gpios" like | |
432 | * all other SPI hardware. Allow this specifically for | |
433 | * Freescale and PPC devices. | |
434 | */ | |
307c593b | 435 | #if IS_ENABLED(CONFIG_SPI_FSL_SPI) |
b311c5cb DT |
436 | { "cs", "gpios", "fsl,spi" }, |
437 | { "cs", "gpios", "aeroflexgaisler,spictrl" }, | |
307c593b DT |
438 | #endif |
439 | #if IS_ENABLED(CONFIG_SPI_PPC4xx) | |
b311c5cb DT |
440 | { "cs", "gpios", "ibm,ppc4xx-spi" }, |
441 | #endif | |
307c593b | 442 | |
b311c5cb DT |
443 | #if IS_ENABLED(CONFIG_TYPEC_FUSB302) |
444 | /* | |
445 | * Fairchild FUSB302 host is using undocumented "fcs,int_n" | |
446 | * property without the compulsory "-gpios" suffix. | |
447 | */ | |
448 | { "fcs,int_n", NULL, "fcs,fusb302" }, | |
449 | #endif | |
6a537d48 | 450 | }; |
b311c5cb DT |
451 | struct gpio_desc *desc; |
452 | const char *legacy_id; | |
453 | unsigned int i; | |
6a537d48 LW |
454 | |
455 | if (!con_id) | |
456 | return ERR_PTR(-ENOENT); | |
457 | ||
b311c5cb DT |
458 | for (i = 0; i < ARRAY_SIZE(gpios); i++) { |
459 | if (strcmp(con_id, gpios[i].con_id)) | |
460 | continue; | |
6a537d48 | 461 | |
b311c5cb DT |
462 | if (gpios[i].compatible && |
463 | !of_device_is_compatible(np, gpios[i].compatible)) | |
464 | continue; | |
11c43bb0 | 465 | |
b311c5cb DT |
466 | legacy_id = gpios[i].legacy_id ?: gpios[i].con_id; |
467 | desc = of_get_named_gpiod_flags(np, legacy_id, idx, of_flags); | |
468 | if (!gpiod_not_found(desc)) { | |
469 | pr_info("%s uses legacy gpio name '%s' instead of '%s-gpios'\n", | |
470 | of_node_full_name(np), legacy_id, con_id); | |
471 | return desc; | |
472 | } | |
473 | } | |
6e24826d | 474 | |
b311c5cb | 475 | return ERR_PTR(-ENOENT); |
6e24826d LW |
476 | } |
477 | ||
326c3753 DT |
478 | static struct gpio_desc *of_find_mt2701_gpio(struct device_node *np, |
479 | const char *con_id, | |
480 | unsigned int idx, | |
481 | enum of_gpio_flags *of_flags) | |
482 | { | |
483 | struct gpio_desc *desc; | |
484 | const char *legacy_id; | |
485 | ||
486 | if (!IS_ENABLED(CONFIG_SND_SOC_MT2701_CS42448)) | |
487 | return ERR_PTR(-ENOENT); | |
488 | ||
489 | if (!of_device_is_compatible(np, "mediatek,mt2701-cs42448-machine")) | |
490 | return ERR_PTR(-ENOENT); | |
491 | ||
492 | if (!con_id || strcmp(con_id, "i2s1-in-sel")) | |
493 | return ERR_PTR(-ENOENT); | |
494 | ||
495 | if (idx == 0) | |
496 | legacy_id = "i2s1-in-sel-gpio1"; | |
497 | else if (idx == 1) | |
498 | legacy_id = "i2s1-in-sel-gpio2"; | |
499 | else | |
500 | return ERR_PTR(-ENOENT); | |
501 | ||
502 | desc = of_get_named_gpiod_flags(np, legacy_id, 0, of_flags); | |
503 | if (!gpiod_not_found(desc)) | |
504 | pr_info("%s is using legacy gpio name '%s' instead of '%s-gpios'\n", | |
505 | of_node_full_name(np), legacy_id, con_id); | |
506 | ||
507 | return desc; | |
508 | } | |
509 | ||
a2b5e207 DT |
510 | typedef struct gpio_desc *(*of_find_gpio_quirk)(struct device_node *np, |
511 | const char *con_id, | |
512 | unsigned int idx, | |
513 | enum of_gpio_flags *of_flags); | |
514 | static const of_find_gpio_quirk of_find_gpio_quirks[] = { | |
b311c5cb | 515 | of_find_gpio_rename, |
326c3753 | 516 | of_find_mt2701_gpio, |
8b10ca2f | 517 | NULL |
a2b5e207 DT |
518 | }; |
519 | ||
ea713bc4 | 520 | struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, |
fed7026a | 521 | unsigned int idx, unsigned long *flags) |
ea713bc4 LW |
522 | { |
523 | char prop_name[32]; /* 32 is max size of property name */ | |
524 | enum of_gpio_flags of_flags; | |
a2b5e207 | 525 | const of_find_gpio_quirk *q; |
ea713bc4 LW |
526 | struct gpio_desc *desc; |
527 | unsigned int i; | |
528 | ||
c8582339 | 529 | /* Try GPIO property "foo-gpios" and "foo-gpio" */ |
ea713bc4 LW |
530 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
531 | if (con_id) | |
532 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, | |
533 | gpio_suffixes[i]); | |
534 | else | |
535 | snprintf(prop_name, sizeof(prop_name), "%s", | |
536 | gpio_suffixes[i]); | |
537 | ||
538 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, | |
539 | &of_flags); | |
6662ae6a | 540 | |
7b58696d | 541 | if (!gpiod_not_found(desc)) |
ea713bc4 LW |
542 | break; |
543 | } | |
544 | ||
a2b5e207 DT |
545 | /* Properly named GPIO was not found, try workarounds */ |
546 | for (q = of_find_gpio_quirks; gpiod_not_found(desc) && *q; q++) | |
547 | desc = (*q)(dev->of_node, con_id, idx, &of_flags); | |
6e24826d | 548 | |
ea713bc4 LW |
549 | if (IS_ERR(desc)) |
550 | return desc; | |
551 | ||
d9e7f0e3 | 552 | *flags = of_convert_gpio_flags(of_flags); |
d449991c | 553 | |
ea713bc4 LW |
554 | return desc; |
555 | } | |
556 | ||
f625d460 | 557 | /** |
fd7337fd | 558 | * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API |
f625d460 | 559 | * @np: device node to get GPIO from |
be715343 | 560 | * @chip: GPIO chip whose hog is parsed |
a79fead5 | 561 | * @idx: Index of the GPIO to parse |
f625d460 | 562 | * @name: GPIO line name |
fed7026a AS |
563 | * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from |
564 | * of_find_gpio() or of_parse_own_gpio() | |
f625d460 BP |
565 | * @dflags: gpiod_flags - optional GPIO initialization flags |
566 | * | |
567 | * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno | |
568 | * value on the error condition. | |
569 | */ | |
fd7337fd | 570 | static struct gpio_desc *of_parse_own_gpio(struct device_node *np, |
be715343 | 571 | struct gpio_chip *chip, |
a79fead5 | 572 | unsigned int idx, const char **name, |
fed7026a | 573 | unsigned long *lflags, |
fd7337fd | 574 | enum gpiod_flags *dflags) |
f625d460 BP |
575 | { |
576 | struct device_node *chip_np; | |
577 | enum of_gpio_flags xlate_flags; | |
be715343 MY |
578 | struct of_phandle_args gpiospec; |
579 | struct gpio_desc *desc; | |
a79fead5 | 580 | unsigned int i; |
f625d460 | 581 | u32 tmp; |
3f9547e1 | 582 | int ret; |
f625d460 | 583 | |
be715343 | 584 | chip_np = chip->of_node; |
f625d460 BP |
585 | if (!chip_np) |
586 | return ERR_PTR(-EINVAL); | |
587 | ||
588 | xlate_flags = 0; | |
2d6c06f5 | 589 | *lflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
40941954 | 590 | *dflags = GPIOD_ASIS; |
f625d460 BP |
591 | |
592 | ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp); | |
593 | if (ret) | |
594 | return ERR_PTR(ret); | |
595 | ||
be715343 MY |
596 | gpiospec.np = chip_np; |
597 | gpiospec.args_count = tmp; | |
f625d460 | 598 | |
a79fead5 GU |
599 | for (i = 0; i < tmp; i++) { |
600 | ret = of_property_read_u32_index(np, "gpios", idx * tmp + i, | |
601 | &gpiospec.args[i]); | |
602 | if (ret) | |
603 | return ERR_PTR(ret); | |
604 | } | |
f625d460 | 605 | |
99468c1a | 606 | desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags); |
be715343 MY |
607 | if (IS_ERR(desc)) |
608 | return desc; | |
f625d460 | 609 | |
d9e7f0e3 | 610 | *lflags = of_convert_gpio_flags(xlate_flags); |
f625d460 BP |
611 | |
612 | if (of_property_read_bool(np, "input")) | |
613 | *dflags |= GPIOD_IN; | |
614 | else if (of_property_read_bool(np, "output-low")) | |
615 | *dflags |= GPIOD_OUT_LOW; | |
616 | else if (of_property_read_bool(np, "output-high")) | |
617 | *dflags |= GPIOD_OUT_HIGH; | |
618 | else { | |
62cdcb6c RH |
619 | pr_warn("GPIO line %d (%pOFn): no hogging state specified, bailing out\n", |
620 | desc_to_gpio(desc), np); | |
f625d460 BP |
621 | return ERR_PTR(-EINVAL); |
622 | } | |
623 | ||
624 | if (name && of_property_read_string(np, "line-name", name)) | |
625 | *name = np->name; | |
626 | ||
be715343 | 627 | return desc; |
f625d460 BP |
628 | } |
629 | ||
bc21077e GU |
630 | /** |
631 | * of_gpiochip_add_hog - Add all hogs in a hog device node | |
632 | * @chip: gpio chip to act on | |
633 | * @hog: device node describing the hogs | |
634 | * | |
635 | * Returns error if it fails otherwise 0 on success. | |
636 | */ | |
637 | static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog) | |
638 | { | |
639 | enum gpiod_flags dflags; | |
640 | struct gpio_desc *desc; | |
641 | unsigned long lflags; | |
642 | const char *name; | |
643 | unsigned int i; | |
644 | int ret; | |
645 | ||
646 | for (i = 0;; i++) { | |
647 | desc = of_parse_own_gpio(hog, chip, i, &name, &lflags, &dflags); | |
648 | if (IS_ERR(desc)) | |
649 | break; | |
650 | ||
651 | ret = gpiod_hog(desc, name, lflags, dflags); | |
652 | if (ret < 0) | |
653 | return ret; | |
63636d95 GU |
654 | |
655 | #ifdef CONFIG_OF_DYNAMIC | |
656 | desc->hog = hog; | |
657 | #endif | |
bc21077e GU |
658 | } |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
f625d460 | 663 | /** |
fd7337fd | 664 | * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions |
f625d460 BP |
665 | * @chip: gpio chip to act on |
666 | * | |
667 | * This is only used by of_gpiochip_add to request/set GPIO initial | |
668 | * configuration. | |
ead066e6 | 669 | * It returns error if it fails otherwise 0 on success. |
f625d460 | 670 | */ |
dfbd379b | 671 | static int of_gpiochip_scan_gpios(struct gpio_chip *chip) |
f625d460 | 672 | { |
f625d460 | 673 | struct device_node *np; |
dfbd379b | 674 | int ret; |
f625d460 | 675 | |
d1279d94 | 676 | for_each_available_child_of_node(chip->of_node, np) { |
f625d460 BP |
677 | if (!of_property_read_bool(np, "gpio-hog")) |
678 | continue; | |
679 | ||
bc21077e GU |
680 | ret = of_gpiochip_add_hog(chip, np); |
681 | if (ret < 0) { | |
682 | of_node_put(np); | |
683 | return ret; | |
09e258af | 684 | } |
63636d95 GU |
685 | |
686 | of_node_set_flag(np, OF_POPULATED); | |
f625d460 | 687 | } |
dfbd379b LD |
688 | |
689 | return 0; | |
f625d460 BP |
690 | } |
691 | ||
63636d95 GU |
692 | #ifdef CONFIG_OF_DYNAMIC |
693 | /** | |
694 | * of_gpiochip_remove_hog - Remove all hogs in a hog device node | |
695 | * @chip: gpio chip to act on | |
696 | * @hog: device node describing the hogs | |
697 | */ | |
698 | static void of_gpiochip_remove_hog(struct gpio_chip *chip, | |
699 | struct device_node *hog) | |
700 | { | |
80c78fbe | 701 | struct gpio_desc *desc; |
63636d95 | 702 | |
57017edd | 703 | for_each_gpio_desc_with_flag(chip, desc, FLAG_IS_HOGGED) |
80c78fbe AS |
704 | if (desc->hog == hog) |
705 | gpiochip_free_own_desc(desc); | |
63636d95 GU |
706 | } |
707 | ||
708 | static int of_gpiochip_match_node(struct gpio_chip *chip, void *data) | |
709 | { | |
597a8a88 | 710 | return device_match_of_node(&chip->gpiodev->dev, data); |
63636d95 GU |
711 | } |
712 | ||
713 | static struct gpio_chip *of_find_gpiochip_by_node(struct device_node *np) | |
714 | { | |
715 | return gpiochip_find(np, of_gpiochip_match_node); | |
716 | } | |
717 | ||
718 | static int of_gpio_notify(struct notifier_block *nb, unsigned long action, | |
719 | void *arg) | |
720 | { | |
721 | struct of_reconfig_data *rd = arg; | |
722 | struct gpio_chip *chip; | |
723 | int ret; | |
724 | ||
725 | /* | |
726 | * This only supports adding and removing complete gpio-hog nodes. | |
727 | * Modifying an existing gpio-hog node is not supported (except for | |
728 | * changing its "status" property, which is treated the same as | |
729 | * addition/removal). | |
730 | */ | |
731 | switch (of_reconfig_get_state_change(action, arg)) { | |
732 | case OF_RECONFIG_CHANGE_ADD: | |
733 | if (!of_property_read_bool(rd->dn, "gpio-hog")) | |
734 | return NOTIFY_OK; /* not for us */ | |
735 | ||
736 | if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) | |
737 | return NOTIFY_OK; | |
738 | ||
739 | chip = of_find_gpiochip_by_node(rd->dn->parent); | |
740 | if (chip == NULL) | |
741 | return NOTIFY_OK; /* not for us */ | |
742 | ||
743 | ret = of_gpiochip_add_hog(chip, rd->dn); | |
744 | if (ret < 0) { | |
745 | pr_err("%s: failed to add hogs for %pOF\n", __func__, | |
746 | rd->dn); | |
747 | of_node_clear_flag(rd->dn, OF_POPULATED); | |
748 | return notifier_from_errno(ret); | |
749 | } | |
750 | break; | |
751 | ||
752 | case OF_RECONFIG_CHANGE_REMOVE: | |
753 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) | |
754 | return NOTIFY_OK; /* already depopulated */ | |
755 | ||
756 | chip = of_find_gpiochip_by_node(rd->dn->parent); | |
757 | if (chip == NULL) | |
758 | return NOTIFY_OK; /* not for us */ | |
759 | ||
760 | of_gpiochip_remove_hog(chip, rd->dn); | |
761 | of_node_clear_flag(rd->dn, OF_POPULATED); | |
762 | break; | |
763 | } | |
764 | ||
765 | return NOTIFY_OK; | |
766 | } | |
767 | ||
768 | struct notifier_block gpio_of_notifier = { | |
769 | .notifier_call = of_gpio_notify, | |
770 | }; | |
771 | #endif /* CONFIG_OF_DYNAMIC */ | |
772 | ||
863fbf49 | 773 | /** |
67049c50 | 774 | * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags |
a19e3da5 | 775 | * @gc: pointer to the gpio_chip structure |
67049c50 | 776 | * @gpiospec: GPIO specifier as found in the device tree |
b908b53d | 777 | * @flags: a flags pointer to fill in |
863fbf49 AV |
778 | * |
779 | * This is simple translation function, suitable for the most 1:1 mapped | |
67049c50 | 780 | * GPIO chips. This function performs only one sanity check: whether GPIO |
863fbf49 AV |
781 | * is less than ngpios (that is specified in the gpio_chip). |
782 | */ | |
b0c7e73b GU |
783 | static int of_gpio_simple_xlate(struct gpio_chip *gc, |
784 | const struct of_phandle_args *gpiospec, | |
785 | u32 *flags) | |
863fbf49 | 786 | { |
b908b53d AV |
787 | /* |
788 | * We're discouraging gpio_cells < 2, since that way you'll have to | |
20a8a968 | 789 | * write your own xlate function (that will have to retrieve the GPIO |
b908b53d AV |
790 | * number and the flags from a single gpio cell -- this is possible, |
791 | * but not recommended). | |
792 | */ | |
a19e3da5 | 793 | if (gc->of_gpio_n_cells < 2) { |
b908b53d AV |
794 | WARN_ON(1); |
795 | return -EINVAL; | |
796 | } | |
797 | ||
15c9a0ac GL |
798 | if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) |
799 | return -EINVAL; | |
800 | ||
6270d830 | 801 | if (gpiospec->args[0] >= gc->ngpio) |
863fbf49 AV |
802 | return -EINVAL; |
803 | ||
b908b53d | 804 | if (flags) |
15c9a0ac | 805 | *flags = gpiospec->args[1]; |
b908b53d | 806 | |
15c9a0ac | 807 | return gpiospec->args[0]; |
863fbf49 | 808 | } |
863fbf49 | 809 | |
863fbf49 | 810 | /** |
3208b0f0 | 811 | * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank) |
863fbf49 AV |
812 | * @np: device node of the GPIO chip |
813 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
3208b0f0 | 814 | * @data: driver data to store in the struct gpio_chip |
863fbf49 AV |
815 | * |
816 | * To use this function you should allocate and fill mm_gc with: | |
817 | * | |
818 | * 1) In the gpio_chip structure: | |
819 | * - all the callbacks | |
a19e3da5 AV |
820 | * - of_gpio_n_cells |
821 | * - of_xlate callback (optional) | |
863fbf49 AV |
822 | * |
823 | * 3) In the of_mm_gpio_chip structure: | |
824 | * - save_regs callback (optional) | |
825 | * | |
826 | * If succeeded, this function will map bank's memory and will | |
827 | * do all necessary work for you. Then you'll able to use .regs | |
828 | * to manage GPIOs from the callbacks. | |
829 | */ | |
3208b0f0 LW |
830 | int of_mm_gpiochip_add_data(struct device_node *np, |
831 | struct of_mm_gpio_chip *mm_gc, | |
832 | void *data) | |
863fbf49 AV |
833 | { |
834 | int ret = -ENOMEM; | |
a19e3da5 | 835 | struct gpio_chip *gc = &mm_gc->gc; |
863fbf49 | 836 | |
7eb6ce2f | 837 | gc->label = kasprintf(GFP_KERNEL, "%pOF", np); |
863fbf49 AV |
838 | if (!gc->label) |
839 | goto err0; | |
840 | ||
841 | mm_gc->regs = of_iomap(np, 0); | |
842 | if (!mm_gc->regs) | |
843 | goto err1; | |
844 | ||
21451155 | 845 | gc->base = -1; |
863fbf49 | 846 | |
863fbf49 AV |
847 | if (mm_gc->save_regs) |
848 | mm_gc->save_regs(mm_gc); | |
849 | ||
5d07a692 LH |
850 | of_node_put(mm_gc->gc.of_node); |
851 | mm_gc->gc.of_node = of_node_get(np); | |
863fbf49 | 852 | |
3208b0f0 | 853 | ret = gpiochip_add_data(gc, data); |
863fbf49 AV |
854 | if (ret) |
855 | goto err2; | |
856 | ||
863fbf49 AV |
857 | return 0; |
858 | err2: | |
5d07a692 | 859 | of_node_put(np); |
863fbf49 AV |
860 | iounmap(mm_gc->regs); |
861 | err1: | |
862 | kfree(gc->label); | |
863 | err0: | |
7eb6ce2f | 864 | pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret); |
863fbf49 AV |
865 | return ret; |
866 | } | |
6d662455 | 867 | EXPORT_SYMBOL_GPL(of_mm_gpiochip_add_data); |
594fa265 | 868 | |
d621e8ba RRD |
869 | /** |
870 | * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank) | |
871 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
872 | */ | |
873 | void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) | |
874 | { | |
875 | struct gpio_chip *gc = &mm_gc->gc; | |
876 | ||
877 | if (!mm_gc) | |
878 | return; | |
879 | ||
880 | gpiochip_remove(gc); | |
881 | iounmap(mm_gc->regs); | |
882 | kfree(gc->label); | |
883 | } | |
6d662455 | 884 | EXPORT_SYMBOL_GPL(of_mm_gpiochip_remove); |
d621e8ba | 885 | |
726cb3ba SB |
886 | static void of_gpiochip_init_valid_mask(struct gpio_chip *chip) |
887 | { | |
888 | int len, i; | |
889 | u32 start, count; | |
890 | struct device_node *np = chip->of_node; | |
891 | ||
892 | len = of_property_count_u32_elems(np, "gpio-reserved-ranges"); | |
893 | if (len < 0 || len % 2 != 0) | |
894 | return; | |
895 | ||
896 | for (i = 0; i < len; i += 2) { | |
897 | of_property_read_u32_index(np, "gpio-reserved-ranges", | |
898 | i, &start); | |
899 | of_property_read_u32_index(np, "gpio-reserved-ranges", | |
900 | i + 1, &count); | |
e75f88ef | 901 | if (start >= chip->ngpio || start + count > chip->ngpio) |
726cb3ba SB |
902 | continue; |
903 | ||
904 | bitmap_clear(chip->valid_mask, start, count); | |
905 | } | |
906 | }; | |
907 | ||
f23f1516 | 908 | #ifdef CONFIG_PINCTRL |
28355f81 | 909 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) |
f23f1516 SH |
910 | { |
911 | struct device_node *np = chip->of_node; | |
f23f1516 | 912 | struct of_phandle_args pinspec; |
1e63d7b9 | 913 | struct pinctrl_dev *pctldev; |
f23f1516 | 914 | int index = 0, ret; |
586a87e6 CR |
915 | const char *name; |
916 | static const char group_names_propname[] = "gpio-ranges-group-names"; | |
917 | struct property *group_names; | |
f23f1516 SH |
918 | |
919 | if (!np) | |
28355f81 | 920 | return 0; |
f23f1516 | 921 | |
3550bba2 SW |
922 | if (!of_property_read_bool(np, "gpio-ranges") && |
923 | chip->of_gpio_ranges_fallback) { | |
924 | return chip->of_gpio_ranges_fallback(chip, np); | |
925 | } | |
926 | ||
586a87e6 CR |
927 | group_names = of_find_property(np, group_names_propname, NULL); |
928 | ||
ad4e1a7c | 929 | for (;; index++) { |
d9fe0039 SW |
930 | ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, |
931 | index, &pinspec); | |
f23f1516 SH |
932 | if (ret) |
933 | break; | |
934 | ||
1e63d7b9 | 935 | pctldev = of_pinctrl_get(pinspec.np); |
602cf638 | 936 | of_node_put(pinspec.np); |
1e63d7b9 | 937 | if (!pctldev) |
28355f81 | 938 | return -EPROBE_DEFER; |
f23f1516 | 939 | |
586a87e6 CR |
940 | if (pinspec.args[2]) { |
941 | if (group_names) { | |
72858602 | 942 | of_property_read_string_index(np, |
586a87e6 CR |
943 | group_names_propname, |
944 | index, &name); | |
945 | if (strlen(name)) { | |
7eb6ce2f RH |
946 | pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n", |
947 | np); | |
586a87e6 CR |
948 | break; |
949 | } | |
950 | } | |
951 | /* npins != 0: linear range */ | |
952 | ret = gpiochip_add_pin_range(chip, | |
953 | pinctrl_dev_get_devname(pctldev), | |
954 | pinspec.args[0], | |
955 | pinspec.args[1], | |
956 | pinspec.args[2]); | |
957 | if (ret) | |
28355f81 | 958 | return ret; |
586a87e6 CR |
959 | } else { |
960 | /* npins == 0: special range */ | |
961 | if (pinspec.args[1]) { | |
7eb6ce2f RH |
962 | pr_err("%pOF: Illegal gpio-range format.\n", |
963 | np); | |
586a87e6 CR |
964 | break; |
965 | } | |
966 | ||
967 | if (!group_names) { | |
7eb6ce2f RH |
968 | pr_err("%pOF: GPIO group range requested but no %s property.\n", |
969 | np, group_names_propname); | |
586a87e6 CR |
970 | break; |
971 | } | |
972 | ||
973 | ret = of_property_read_string_index(np, | |
974 | group_names_propname, | |
975 | index, &name); | |
976 | if (ret) | |
977 | break; | |
978 | ||
979 | if (!strlen(name)) { | |
7eb6ce2f RH |
980 | pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n", |
981 | np); | |
586a87e6 CR |
982 | break; |
983 | } | |
984 | ||
985 | ret = gpiochip_add_pingroup_range(chip, pctldev, | |
986 | pinspec.args[0], name); | |
987 | if (ret) | |
28355f81 | 988 | return ret; |
586a87e6 | 989 | } |
ad4e1a7c | 990 | } |
28355f81 TV |
991 | |
992 | return 0; | |
f23f1516 SH |
993 | } |
994 | ||
f23f1516 | 995 | #else |
28355f81 | 996 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } |
f23f1516 SH |
997 | #endif |
998 | ||
28355f81 | 999 | int of_gpiochip_add(struct gpio_chip *chip) |
391c970c | 1000 | { |
f0d1ab05 | 1001 | int ret; |
28355f81 | 1002 | |
391c970c | 1003 | if (!chip->of_node) |
28355f81 | 1004 | return 0; |
391c970c AV |
1005 | |
1006 | if (!chip->of_xlate) { | |
1007 | chip->of_gpio_n_cells = 2; | |
1008 | chip->of_xlate = of_gpio_simple_xlate; | |
1009 | } | |
1010 | ||
1020dfd1 MY |
1011 | if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS) |
1012 | return -EINVAL; | |
1013 | ||
726cb3ba SB |
1014 | of_gpiochip_init_valid_mask(chip); |
1015 | ||
f0d1ab05 LW |
1016 | ret = of_gpiochip_add_pin_range(chip); |
1017 | if (ret) | |
1018 | return ret; | |
28355f81 | 1019 | |
391c970c | 1020 | of_node_get(chip->of_node); |
f625d460 | 1021 | |
f0d1ab05 | 1022 | ret = of_gpiochip_scan_gpios(chip); |
2f4133bb | 1023 | if (ret) |
f7299d44 | 1024 | of_node_put(chip->of_node); |
f7299d44 | 1025 | |
f0d1ab05 | 1026 | return ret; |
391c970c AV |
1027 | } |
1028 | ||
1029 | void of_gpiochip_remove(struct gpio_chip *chip) | |
1030 | { | |
8a691550 | 1031 | of_node_put(chip->of_node); |
391c970c | 1032 | } |
4731210c SK |
1033 | |
1034 | void of_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev) | |
1035 | { | |
1df62542 AS |
1036 | /* Set default OF node to parent's one if present */ |
1037 | if (gc->parent) | |
1038 | gdev->dev.of_node = gc->parent->of_node; | |
1039 | ||
ac627260 BG |
1040 | if (gc->fwnode) |
1041 | gc->of_node = to_of_node(gc->fwnode); | |
1042 | ||
4731210c SK |
1043 | /* If the gpiochip has an assigned OF node this takes precedence */ |
1044 | if (gc->of_node) | |
1045 | gdev->dev.of_node = gc->of_node; | |
1046 | else | |
1047 | gc->of_node = gdev->dev.of_node; | |
4731210c | 1048 | } |