Commit | Line | Data |
---|---|---|
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 AV |
12 | #include <linux/errno.h> |
13 | #include <linux/io.h> | |
380c7ba3 | 14 | #include <linux/module.h> |
863fbf49 | 15 | #include <linux/of.h> |
2e13cba8 | 16 | #include <linux/of_address.h> |
863fbf49 | 17 | #include <linux/of_gpio.h> |
f23f1516 | 18 | #include <linux/pinctrl/pinctrl.h> |
2e13cba8 | 19 | #include <linux/slab.h> |
380c7ba3 AS |
20 | #include <linux/string.h> |
21 | ||
22 | #include <linux/gpio/consumer.h> | |
f625d460 | 23 | #include <linux/gpio/machine.h> |
863fbf49 | 24 | |
1bd6b601 | 25 | #include "gpiolib.h" |
f626d6df LW |
26 | #include "gpiolib-of.h" |
27 | ||
eed5a3bf AS |
28 | /* |
29 | * This is Linux-specific flags. By default controllers' and Linux' mapping | |
30 | * match, but GPIO controllers are free to translate their own flags to | |
31 | * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended. | |
32 | */ | |
33 | enum of_gpio_flags { | |
34 | OF_GPIO_ACTIVE_LOW = 0x1, | |
35 | OF_GPIO_SINGLE_ENDED = 0x2, | |
36 | OF_GPIO_OPEN_DRAIN = 0x4, | |
37 | OF_GPIO_TRANSITORY = 0x8, | |
38 | OF_GPIO_PULL_UP = 0x10, | |
39 | OF_GPIO_PULL_DOWN = 0x20, | |
40 | OF_GPIO_PULL_DISABLE = 0x40, | |
41 | }; | |
42 | ||
c7835652 DT |
43 | /** |
44 | * of_gpio_named_count() - Count GPIOs for a device | |
45 | * @np: device node to count GPIOs for | |
46 | * @propname: property name containing gpio specifier(s) | |
47 | * | |
48 | * The function returns the count of GPIOs specified for a node. | |
49 | * Note that the empty GPIO specifiers count too. Returns either | |
50 | * Number of gpios defined in property, | |
51 | * -EINVAL for an incorrectly formed gpios property, or | |
52 | * -ENOENT for a missing gpios property | |
53 | * | |
54 | * Example: | |
55 | * gpios = <0 | |
56 | * &gpio1 1 2 | |
57 | * 0 | |
58 | * &gpio2 3 4>; | |
59 | * | |
60 | * The above example defines four GPIOs, two of which are not specified. | |
61 | * This function will return '4' | |
62 | */ | |
63 | static int of_gpio_named_count(const struct device_node *np, | |
64 | const char *propname) | |
65 | { | |
66 | return of_count_phandle_with_args(np, propname, "#gpio-cells"); | |
67 | } | |
68 | ||
71b8f600 LW |
69 | /** |
70 | * of_gpio_spi_cs_get_count() - special GPIO counting for SPI | |
c5a66b97 LJ |
71 | * @dev: Consuming device |
72 | * @con_id: Function within the GPIO consumer | |
73 | * | |
71b8f600 | 74 | * Some elder GPIO controllers need special quirks. Currently we handle |
47267732 | 75 | * the Freescale and PPC GPIO controller with bindings that doesn't use the |
71b8f600 LW |
76 | * established "cs-gpios" for chip selects but instead rely on |
77 | * "gpios" for the chip select lines. If we detect this, we redirect | |
78 | * the counting of "cs-gpios" to count "gpios" transparent to the | |
79 | * driver. | |
80 | */ | |
a1f4c96b | 81 | static int of_gpio_spi_cs_get_count(struct device *dev, const char *con_id) |
71b8f600 LW |
82 | { |
83 | struct device_node *np = dev->of_node; | |
84 | ||
85 | if (!IS_ENABLED(CONFIG_SPI_MASTER)) | |
86 | return 0; | |
87 | if (!con_id || strcmp(con_id, "cs")) | |
88 | return 0; | |
89 | if (!of_device_is_compatible(np, "fsl,spi") && | |
47267732 LW |
90 | !of_device_is_compatible(np, "aeroflexgaisler,spictrl") && |
91 | !of_device_is_compatible(np, "ibm,ppc4xx-spi")) | |
71b8f600 LW |
92 | return 0; |
93 | return of_gpio_named_count(np, "gpios"); | |
94 | } | |
95 | ||
f626d6df LW |
96 | int of_gpio_get_count(struct device *dev, const char *con_id) |
97 | { | |
98 | int ret; | |
99 | char propname[32]; | |
100 | unsigned int i; | |
101 | ||
71b8f600 LW |
102 | ret = of_gpio_spi_cs_get_count(dev, con_id); |
103 | if (ret > 0) | |
104 | return ret; | |
105 | ||
f626d6df LW |
106 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
107 | if (con_id) | |
108 | snprintf(propname, sizeof(propname), "%s-%s", | |
109 | con_id, gpio_suffixes[i]); | |
110 | else | |
111 | snprintf(propname, sizeof(propname), "%s", | |
112 | gpio_suffixes[i]); | |
113 | ||
114 | ret = of_gpio_named_count(dev->of_node, propname); | |
115 | if (ret > 0) | |
116 | break; | |
117 | } | |
118 | return ret ? ret : -ENOENT; | |
119 | } | |
af8b6375 | 120 | |
c7e9d398 | 121 | static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data) |
3d0f7cf0 | 122 | { |
c7e9d398 MY |
123 | struct of_phandle_args *gpiospec = data; |
124 | ||
d59fdbc7 | 125 | return device_match_of_node(&chip->gpiodev->dev, gpiospec->np) && |
d49b48f0 | 126 | chip->of_xlate && |
c7e9d398 | 127 | chip->of_xlate(chip, gpiospec, NULL) >= 0; |
762c2e46 | 128 | } |
3d0f7cf0 | 129 | |
c7e9d398 MY |
130 | static struct gpio_chip *of_find_gpiochip_by_xlate( |
131 | struct of_phandle_args *gpiospec) | |
762c2e46 | 132 | { |
c7e9d398 | 133 | return gpiochip_find(gpiospec, of_gpiochip_match_node_and_xlate); |
3d0f7cf0 | 134 | } |
3d0f7cf0 | 135 | |
99468c1a MY |
136 | static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip, |
137 | struct of_phandle_args *gpiospec, | |
138 | enum of_gpio_flags *flags) | |
3d0f7cf0 | 139 | { |
3d0f7cf0 GL |
140 | int ret; |
141 | ||
99468c1a MY |
142 | if (chip->of_gpio_n_cells != gpiospec->args_count) |
143 | return ERR_PTR(-EINVAL); | |
144 | ||
145 | ret = chip->of_xlate(chip, gpiospec, flags); | |
146 | if (ret < 0) | |
147 | return ERR_PTR(ret); | |
148 | ||
149 | return gpiochip_get_desc(chip, ret); | |
3d0f7cf0 GL |
150 | } |
151 | ||
e3186e36 DT |
152 | /* |
153 | * Overrides stated polarity of a gpio line and warns when there is a | |
154 | * discrepancy. | |
155 | */ | |
156 | static void of_gpio_quirk_polarity(const struct device_node *np, | |
157 | bool active_high, | |
158 | enum of_gpio_flags *flags) | |
159 | { | |
160 | if (active_high) { | |
161 | if (*flags & OF_GPIO_ACTIVE_LOW) { | |
162 | pr_warn("%s GPIO handle specifies active low - ignored\n", | |
163 | of_node_full_name(np)); | |
164 | *flags &= ~OF_GPIO_ACTIVE_LOW; | |
165 | } | |
166 | } else { | |
167 | if (!(*flags & OF_GPIO_ACTIVE_LOW)) | |
168 | pr_info("%s enforce active low on GPIO handle\n", | |
169 | of_node_full_name(np)); | |
170 | *flags |= OF_GPIO_ACTIVE_LOW; | |
171 | } | |
172 | } | |
173 | ||
99d18d42 DT |
174 | /* |
175 | * This quirk does static polarity overrides in cases where existing | |
176 | * DTS specified incorrect polarity. | |
177 | */ | |
178 | static void of_gpio_try_fixup_polarity(const struct device_node *np, | |
179 | const char *propname, | |
180 | enum of_gpio_flags *flags) | |
181 | { | |
182 | static const struct { | |
183 | const char *compatible; | |
184 | const char *propname; | |
185 | bool active_high; | |
186 | } gpios[] = { | |
187 | #if !IS_ENABLED(CONFIG_LCD_HX8357) | |
188 | /* | |
189 | * Himax LCD controllers used incorrectly named | |
190 | * "gpios-reset" property and also specified wrong | |
191 | * polarity. | |
192 | */ | |
193 | { "himax,hx8357", "gpios-reset", false }, | |
194 | { "himax,hx8369", "gpios-reset", false }, | |
195 | #endif | |
196 | }; | |
197 | unsigned int i; | |
198 | ||
199 | for (i = 0; i < ARRAY_SIZE(gpios); i++) { | |
200 | if (of_device_is_compatible(np, gpios[i].compatible) && | |
201 | !strcmp(propname, gpios[i].propname)) { | |
202 | of_gpio_quirk_polarity(np, gpios[i].active_high, flags); | |
203 | break; | |
204 | } | |
205 | } | |
206 | } | |
207 | ||
34cb9352 DT |
208 | static void of_gpio_set_polarity_by_property(const struct device_node *np, |
209 | const char *propname, | |
210 | enum of_gpio_flags *flags) | |
a603a2b8 | 211 | { |
34cb9352 DT |
212 | static const struct { |
213 | const char *compatible; | |
214 | const char *gpio_propname; | |
215 | const char *polarity_propname; | |
216 | } gpios[] = { | |
217 | #if IS_ENABLED(CONFIG_FEC) | |
218 | /* Freescale Fast Ethernet Controller */ | |
219 | { "fsl,imx25-fec", "phy-reset-gpios", "phy-reset-active-high" }, | |
220 | { "fsl,imx27-fec", "phy-reset-gpios", "phy-reset-active-high" }, | |
221 | { "fsl,imx28-fec", "phy-reset-gpios", "phy-reset-active-high" }, | |
222 | { "fsl,imx6q-fec", "phy-reset-gpios", "phy-reset-active-high" }, | |
223 | { "fsl,mvf600-fec", "phy-reset-gpios", "phy-reset-active-high" }, | |
224 | { "fsl,imx6sx-fec", "phy-reset-gpios", "phy-reset-active-high" }, | |
225 | { "fsl,imx6ul-fec", "phy-reset-gpios", "phy-reset-active-high" }, | |
226 | { "fsl,imx8mq-fec", "phy-reset-gpios", "phy-reset-active-high" }, | |
227 | { "fsl,imx8qm-fec", "phy-reset-gpios", "phy-reset-active-high" }, | |
228 | { "fsl,s32v234-fec", "phy-reset-gpios", "phy-reset-active-high" }, | |
229 | #endif | |
b8b80348 DT |
230 | #if IS_ENABLED(CONFIG_PCI_IMX6) |
231 | { "fsl,imx6q-pcie", "reset-gpio", "reset-gpio-active-high" }, | |
232 | { "fsl,imx6sx-pcie", "reset-gpio", "reset-gpio-active-high" }, | |
233 | { "fsl,imx6qp-pcie", "reset-gpio", "reset-gpio-active-high" }, | |
234 | { "fsl,imx7d-pcie", "reset-gpio", "reset-gpio-active-high" }, | |
235 | { "fsl,imx8mq-pcie", "reset-gpio", "reset-gpio-active-high" }, | |
236 | { "fsl,imx8mm-pcie", "reset-gpio", "reset-gpio-active-high" }, | |
237 | { "fsl,imx8mp-pcie", "reset-gpio", "reset-gpio-active-high" }, | |
238 | #endif | |
99d18d42 | 239 | |
a603a2b8 LW |
240 | /* |
241 | * The regulator GPIO handles are specified such that the | |
242 | * presence or absence of "enable-active-high" solely controls | |
243 | * the polarity of the GPIO line. Any phandle flags must | |
244 | * be actively ignored. | |
245 | */ | |
34cb9352 DT |
246 | #if IS_ENABLED(CONFIG_REGULATOR_FIXED_VOLTAGE) |
247 | { "regulator-fixed", "gpios", "enable-active-high" }, | |
248 | { "regulator-fixed", "gpio", "enable-active-high" }, | |
249 | { "reg-fixed-voltage", "gpios", "enable-active-high" }, | |
250 | { "reg-fixed-voltage", "gpio", "enable-active-high" }, | |
251 | #endif | |
252 | #if IS_ENABLED(CONFIG_REGULATOR_GPIO) | |
253 | { "regulator-gpio", "enable-gpio", "enable-active-high" }, | |
254 | { "regulator-gpio", "enable-gpios", "enable-active-high" }, | |
255 | #endif | |
256 | }; | |
257 | unsigned int i; | |
258 | bool active_high; | |
259 | ||
260 | for (i = 0; i < ARRAY_SIZE(gpios); i++) { | |
261 | if (of_device_is_compatible(np, gpios[i].compatible) && | |
262 | !strcmp(propname, gpios[i].gpio_propname)) { | |
263 | active_high = of_property_read_bool(np, | |
264 | gpios[i].polarity_propname); | |
265 | of_gpio_quirk_polarity(np, active_high, flags); | |
266 | break; | |
267 | } | |
a603a2b8 | 268 | } |
34cb9352 DT |
269 | } |
270 | ||
271 | static void of_gpio_flags_quirks(const struct device_node *np, | |
272 | const char *propname, | |
273 | enum of_gpio_flags *flags, | |
274 | int index) | |
275 | { | |
276 | of_gpio_try_fixup_polarity(np, propname, flags); | |
277 | of_gpio_set_polarity_by_property(np, propname, flags); | |
278 | ||
a603a2b8 LW |
279 | /* |
280 | * Legacy open drain handling for fixed voltage regulators. | |
281 | */ | |
282 | if (IS_ENABLED(CONFIG_REGULATOR) && | |
283 | of_device_is_compatible(np, "reg-fixed-voltage") && | |
284 | of_property_read_bool(np, "gpio-open-drain")) { | |
285 | *flags |= (OF_GPIO_SINGLE_ENDED | OF_GPIO_OPEN_DRAIN); | |
286 | pr_info("%s uses legacy open drain flag - update the DTS if you can\n", | |
287 | of_node_full_name(np)); | |
288 | } | |
6953c57a LW |
289 | |
290 | /* | |
291 | * Legacy handling of SPI active high chip select. If we have a | |
292 | * property named "cs-gpios" we need to inspect the child node | |
293 | * to determine if the flags should have inverted semantics. | |
294 | */ | |
da7f1349 | 295 | if (IS_ENABLED(CONFIG_SPI_MASTER) && !strcmp(propname, "cs-gpios") && |
a71a81e7 | 296 | of_property_read_bool(np, "cs-gpios")) { |
6953c57a LW |
297 | struct device_node *child; |
298 | u32 cs; | |
299 | int ret; | |
300 | ||
301 | for_each_child_of_node(np, child) { | |
302 | ret = of_property_read_u32(child, "reg", &cs); | |
c1c04cea | 303 | if (ret) |
6953c57a LW |
304 | continue; |
305 | if (cs == index) { | |
306 | /* | |
307 | * SPI children have active low chip selects | |
308 | * by default. This can be specified negatively | |
309 | * by just omitting "spi-cs-high" in the | |
310 | * device node, or actively by tagging on | |
311 | * GPIO_ACTIVE_LOW as flag in the device | |
312 | * tree. If the line is simultaneously | |
313 | * tagged as active low in the device tree | |
314 | * and has the "spi-cs-high" set, we get a | |
315 | * conflict and the "spi-cs-high" flag will | |
316 | * take precedence. | |
317 | */ | |
e3186e36 DT |
318 | bool active_high = of_property_read_bool(child, |
319 | "spi-cs-high"); | |
320 | of_gpio_quirk_polarity(child, active_high, | |
321 | flags); | |
89fea04c | 322 | of_node_put(child); |
6953c57a LW |
323 | break; |
324 | } | |
325 | } | |
326 | } | |
edc1ef3f MB |
327 | |
328 | /* Legacy handling of stmmac's active-low PHY reset line */ | |
329 | if (IS_ENABLED(CONFIG_STMMAC_ETH) && | |
330 | !strcmp(propname, "snps,reset-gpio") && | |
331 | of_property_read_bool(np, "snps,reset-active-low")) | |
332 | *flags |= OF_GPIO_ACTIVE_LOW; | |
a603a2b8 LW |
333 | } |
334 | ||
863fbf49 | 335 | /** |
af8b6375 | 336 | * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API |
863fbf49 | 337 | * @np: device node to get GPIO from |
a6b09191 | 338 | * @propname: property name containing gpio specifier(s) |
863fbf49 | 339 | * @index: index of the GPIO |
b908b53d | 340 | * @flags: a flags pointer to fill in |
863fbf49 | 341 | * |
af8b6375 | 342 | * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno |
b908b53d AV |
343 | * value on the error condition. If @flags is not NULL the function also fills |
344 | * in flags for the GPIO. | |
863fbf49 | 345 | */ |
e6ae9a83 | 346 | static struct gpio_desc *of_get_named_gpiod_flags(const struct device_node *np, |
af8b6375 | 347 | const char *propname, int index, enum of_gpio_flags *flags) |
863fbf49 | 348 | { |
762c2e46 MY |
349 | struct of_phandle_args gpiospec; |
350 | struct gpio_chip *chip; | |
351 | struct gpio_desc *desc; | |
64b60e09 | 352 | int ret; |
3d0f7cf0 | 353 | |
c11e6f0f SB |
354 | ret = of_parse_phandle_with_args_map(np, propname, "gpio", index, |
355 | &gpiospec); | |
64b60e09 | 356 | if (ret) { |
7eb6ce2f RH |
357 | pr_debug("%s: can't parse '%s' property of node '%pOF[%d]'\n", |
358 | __func__, propname, np, index); | |
af8b6375 | 359 | return ERR_PTR(ret); |
863fbf49 AV |
360 | } |
361 | ||
c7e9d398 | 362 | chip = of_find_gpiochip_by_xlate(&gpiospec); |
762c2e46 MY |
363 | if (!chip) { |
364 | desc = ERR_PTR(-EPROBE_DEFER); | |
365 | goto out; | |
366 | } | |
762c2e46 | 367 | |
99468c1a | 368 | desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, flags); |
762c2e46 MY |
369 | if (IS_ERR(desc)) |
370 | goto out; | |
863fbf49 | 371 | |
605f2d34 | 372 | if (flags) |
89a5e15b | 373 | of_gpio_flags_quirks(np, propname, flags, index); |
a603a2b8 | 374 | |
7eb6ce2f RH |
375 | pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n", |
376 | __func__, propname, np, index, | |
762c2e46 MY |
377 | PTR_ERR_OR_ZERO(desc)); |
378 | ||
379 | out: | |
380 | of_node_put(gpiospec.np); | |
381 | ||
382 | return desc; | |
863fbf49 | 383 | } |
863fbf49 | 384 | |
40fc56ee DT |
385 | /** |
386 | * of_get_named_gpio() - Get a GPIO number to use with GPIO API | |
387 | * @np: device node to get GPIO from | |
388 | * @propname: Name of property containing gpio specifier(s) | |
389 | * @index: index of the GPIO | |
390 | * | |
391 | * Returns GPIO number to use with Linux generic GPIO API, or one of the errno | |
392 | * value on the error condition. | |
393 | */ | |
394 | int of_get_named_gpio(const struct device_node *np, const char *propname, | |
395 | int index) | |
f01d9075 AC |
396 | { |
397 | struct gpio_desc *desc; | |
398 | ||
40fc56ee | 399 | desc = of_get_named_gpiod_flags(np, propname, index, NULL); |
f01d9075 AC |
400 | |
401 | if (IS_ERR(desc)) | |
402 | return PTR_ERR(desc); | |
403 | else | |
404 | return desc_to_gpio(desc); | |
405 | } | |
40fc56ee | 406 | EXPORT_SYMBOL_GPL(of_get_named_gpio); |
f01d9075 | 407 | |
d9e7f0e3 DT |
408 | /* Converts gpio_lookup_flags into bitmask of GPIO_* values */ |
409 | static unsigned long of_convert_gpio_flags(enum of_gpio_flags flags) | |
410 | { | |
411 | unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; | |
412 | ||
413 | if (flags & OF_GPIO_ACTIVE_LOW) | |
414 | lflags |= GPIO_ACTIVE_LOW; | |
415 | ||
416 | if (flags & OF_GPIO_SINGLE_ENDED) { | |
417 | if (flags & OF_GPIO_OPEN_DRAIN) | |
418 | lflags |= GPIO_OPEN_DRAIN; | |
419 | else | |
420 | lflags |= GPIO_OPEN_SOURCE; | |
421 | } | |
422 | ||
423 | if (flags & OF_GPIO_TRANSITORY) | |
424 | lflags |= GPIO_TRANSITORY; | |
425 | ||
426 | if (flags & OF_GPIO_PULL_UP) | |
427 | lflags |= GPIO_PULL_UP; | |
428 | ||
429 | if (flags & OF_GPIO_PULL_DOWN) | |
430 | lflags |= GPIO_PULL_DOWN; | |
431 | ||
432 | if (flags & OF_GPIO_PULL_DISABLE) | |
433 | lflags |= GPIO_PULL_DISABLE; | |
434 | ||
435 | return lflags; | |
436 | } | |
437 | ||
b311c5cb | 438 | static struct gpio_desc *of_find_gpio_rename(struct device_node *np, |
e3023bf8 LW |
439 | const char *con_id, |
440 | unsigned int idx, | |
984914ec | 441 | enum of_gpio_flags *of_flags) |
e3023bf8 | 442 | { |
b311c5cb DT |
443 | static const struct of_rename_gpio { |
444 | const char *con_id; | |
445 | const char *legacy_id; /* NULL - same as con_id */ | |
446 | /* | |
447 | * Compatible string can be set to NULL in case where | |
448 | * matching to a particular compatible is not practical, | |
449 | * but it should only be done for gpio names that have | |
450 | * vendor prefix to reduce risk of false positives. | |
451 | * Addition of such entries is strongly discouraged. | |
452 | */ | |
453 | const char *compatible; | |
454 | } gpios[] = { | |
fbbbcd17 DT |
455 | #if !IS_ENABLED(CONFIG_LCD_HX8357) |
456 | /* Himax LCD controllers used "gpios-reset" */ | |
457 | { "reset", "gpios-reset", "himax,hx8357" }, | |
458 | { "reset", "gpios-reset", "himax,hx8369" }, | |
459 | #endif | |
b311c5cb DT |
460 | #if IS_ENABLED(CONFIG_MFD_ARIZONA) |
461 | { "wlf,reset", NULL, NULL }, | |
462 | #endif | |
eaf1a296 DT |
463 | #if IS_ENABLED(CONFIG_RTC_DRV_MOXART) |
464 | { "rtc-data", "gpio-rtc-data", "moxa,moxart-rtc" }, | |
465 | { "rtc-sclk", "gpio-rtc-sclk", "moxa,moxart-rtc" }, | |
466 | { "rtc-reset", "gpio-rtc-reset", "moxa,moxart-rtc" }, | |
467 | #endif | |
9c2cc717 DT |
468 | #if IS_ENABLED(CONFIG_NFC_MRVL_I2C) |
469 | { "reset", "reset-n-io", "marvell,nfc-i2c" }, | |
470 | #endif | |
471 | #if IS_ENABLED(CONFIG_NFC_MRVL_SPI) | |
472 | { "reset", "reset-n-io", "marvell,nfc-spi" }, | |
473 | #endif | |
474 | #if IS_ENABLED(CONFIG_NFC_MRVL_UART) | |
475 | { "reset", "reset-n-io", "marvell,nfc-uart" }, | |
476 | { "reset", "reset-n-io", "mrvl,nfc-uart" }, | |
477 | #endif | |
fbbbcd17 DT |
478 | #if !IS_ENABLED(CONFIG_PCI_LANTIQ) |
479 | /* MIPS Lantiq PCI */ | |
480 | { "reset", "gpios-reset", "lantiq,pci-xway" }, | |
481 | #endif | |
307c593b | 482 | |
b311c5cb DT |
483 | /* |
484 | * Some regulator bindings happened before we managed to | |
485 | * establish that GPIO properties should be named | |
486 | * "foo-gpios" so we have this special kludge for them. | |
487 | */ | |
307c593b | 488 | #if IS_ENABLED(CONFIG_REGULATOR_ARIZONA_LDO1) |
b311c5cb | 489 | { "wlf,ldoena", NULL, NULL }, /* Arizona */ |
307c593b DT |
490 | #endif |
491 | #if IS_ENABLED(CONFIG_REGULATOR_WM8994) | |
b311c5cb DT |
492 | { "wlf,ldo1ena", NULL, NULL }, /* WM8994 */ |
493 | { "wlf,ldo2ena", NULL, NULL }, /* WM8994 */ | |
494 | #endif | |
e3023bf8 | 495 | |
944004eb DT |
496 | #if IS_ENABLED(CONFIG_SND_SOC_CS42L56) |
497 | { "reset", "cirrus,gpio-nreset", "cirrus,cs42l56" }, | |
498 | #endif | |
fbbbcd17 DT |
499 | #if IS_ENABLED(CONFIG_SND_SOC_TLV320AIC3X) |
500 | { "reset", "gpio-reset", "ti,tlv320aic3x" }, | |
501 | { "reset", "gpio-reset", "ti,tlv320aic33" }, | |
502 | { "reset", "gpio-reset", "ti,tlv320aic3007" }, | |
503 | { "reset", "gpio-reset", "ti,tlv320aic3104" }, | |
504 | { "reset", "gpio-reset", "ti,tlv320aic3106" }, | |
505 | #endif | |
307c593b | 506 | #if IS_ENABLED(CONFIG_SPI_GPIO) |
b311c5cb DT |
507 | /* |
508 | * The SPI GPIO bindings happened before we managed to | |
509 | * establish that GPIO properties should be named | |
510 | * "foo-gpios" so we have this special kludge for them. | |
511 | */ | |
512 | { "miso", "gpio-miso", "spi-gpio" }, | |
513 | { "mosi", "gpio-mosi", "spi-gpio" }, | |
514 | { "sck", "gpio-sck", "spi-gpio" }, | |
307c593b | 515 | #endif |
e3023bf8 | 516 | |
b311c5cb DT |
517 | /* |
518 | * The old Freescale bindings use simply "gpios" as name | |
519 | * for the chip select lines rather than "cs-gpios" like | |
520 | * all other SPI hardware. Allow this specifically for | |
521 | * Freescale and PPC devices. | |
522 | */ | |
307c593b | 523 | #if IS_ENABLED(CONFIG_SPI_FSL_SPI) |
b311c5cb DT |
524 | { "cs", "gpios", "fsl,spi" }, |
525 | { "cs", "gpios", "aeroflexgaisler,spictrl" }, | |
307c593b DT |
526 | #endif |
527 | #if IS_ENABLED(CONFIG_SPI_PPC4xx) | |
b311c5cb DT |
528 | { "cs", "gpios", "ibm,ppc4xx-spi" }, |
529 | #endif | |
307c593b | 530 | |
b311c5cb DT |
531 | #if IS_ENABLED(CONFIG_TYPEC_FUSB302) |
532 | /* | |
533 | * Fairchild FUSB302 host is using undocumented "fcs,int_n" | |
534 | * property without the compulsory "-gpios" suffix. | |
535 | */ | |
536 | { "fcs,int_n", NULL, "fcs,fusb302" }, | |
537 | #endif | |
6a537d48 | 538 | }; |
b311c5cb DT |
539 | struct gpio_desc *desc; |
540 | const char *legacy_id; | |
541 | unsigned int i; | |
6a537d48 LW |
542 | |
543 | if (!con_id) | |
544 | return ERR_PTR(-ENOENT); | |
545 | ||
b311c5cb DT |
546 | for (i = 0; i < ARRAY_SIZE(gpios); i++) { |
547 | if (strcmp(con_id, gpios[i].con_id)) | |
548 | continue; | |
6a537d48 | 549 | |
b311c5cb DT |
550 | if (gpios[i].compatible && |
551 | !of_device_is_compatible(np, gpios[i].compatible)) | |
552 | continue; | |
11c43bb0 | 553 | |
b311c5cb DT |
554 | legacy_id = gpios[i].legacy_id ?: gpios[i].con_id; |
555 | desc = of_get_named_gpiod_flags(np, legacy_id, idx, of_flags); | |
556 | if (!gpiod_not_found(desc)) { | |
557 | pr_info("%s uses legacy gpio name '%s' instead of '%s-gpios'\n", | |
558 | of_node_full_name(np), legacy_id, con_id); | |
559 | return desc; | |
560 | } | |
561 | } | |
6e24826d | 562 | |
b311c5cb | 563 | return ERR_PTR(-ENOENT); |
6e24826d LW |
564 | } |
565 | ||
326c3753 DT |
566 | static struct gpio_desc *of_find_mt2701_gpio(struct device_node *np, |
567 | const char *con_id, | |
568 | unsigned int idx, | |
569 | enum of_gpio_flags *of_flags) | |
570 | { | |
571 | struct gpio_desc *desc; | |
572 | const char *legacy_id; | |
573 | ||
574 | if (!IS_ENABLED(CONFIG_SND_SOC_MT2701_CS42448)) | |
575 | return ERR_PTR(-ENOENT); | |
576 | ||
577 | if (!of_device_is_compatible(np, "mediatek,mt2701-cs42448-machine")) | |
578 | return ERR_PTR(-ENOENT); | |
579 | ||
580 | if (!con_id || strcmp(con_id, "i2s1-in-sel")) | |
581 | return ERR_PTR(-ENOENT); | |
582 | ||
583 | if (idx == 0) | |
584 | legacy_id = "i2s1-in-sel-gpio1"; | |
585 | else if (idx == 1) | |
586 | legacy_id = "i2s1-in-sel-gpio2"; | |
587 | else | |
588 | return ERR_PTR(-ENOENT); | |
589 | ||
590 | desc = of_get_named_gpiod_flags(np, legacy_id, 0, of_flags); | |
591 | if (!gpiod_not_found(desc)) | |
592 | pr_info("%s is using legacy gpio name '%s' instead of '%s-gpios'\n", | |
593 | of_node_full_name(np), legacy_id, con_id); | |
594 | ||
595 | return desc; | |
596 | } | |
597 | ||
a2b5e207 DT |
598 | typedef struct gpio_desc *(*of_find_gpio_quirk)(struct device_node *np, |
599 | const char *con_id, | |
600 | unsigned int idx, | |
601 | enum of_gpio_flags *of_flags); | |
602 | static const of_find_gpio_quirk of_find_gpio_quirks[] = { | |
b311c5cb | 603 | of_find_gpio_rename, |
326c3753 | 604 | of_find_mt2701_gpio, |
8b10ca2f | 605 | NULL |
a2b5e207 DT |
606 | }; |
607 | ||
07445ae1 | 608 | struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id, |
fed7026a | 609 | unsigned int idx, unsigned long *flags) |
ea713bc4 LW |
610 | { |
611 | char prop_name[32]; /* 32 is max size of property name */ | |
612 | enum of_gpio_flags of_flags; | |
a2b5e207 | 613 | const of_find_gpio_quirk *q; |
ea713bc4 LW |
614 | struct gpio_desc *desc; |
615 | unsigned int i; | |
616 | ||
c8582339 | 617 | /* Try GPIO property "foo-gpios" and "foo-gpio" */ |
ea713bc4 LW |
618 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
619 | if (con_id) | |
620 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, | |
621 | gpio_suffixes[i]); | |
622 | else | |
623 | snprintf(prop_name, sizeof(prop_name), "%s", | |
624 | gpio_suffixes[i]); | |
625 | ||
07445ae1 | 626 | desc = of_get_named_gpiod_flags(np, prop_name, idx, &of_flags); |
6662ae6a | 627 | |
7b58696d | 628 | if (!gpiod_not_found(desc)) |
ea713bc4 LW |
629 | break; |
630 | } | |
631 | ||
a2b5e207 DT |
632 | /* Properly named GPIO was not found, try workarounds */ |
633 | for (q = of_find_gpio_quirks; gpiod_not_found(desc) && *q; q++) | |
07445ae1 | 634 | desc = (*q)(np, con_id, idx, &of_flags); |
6e24826d | 635 | |
ea713bc4 LW |
636 | if (IS_ERR(desc)) |
637 | return desc; | |
638 | ||
d9e7f0e3 | 639 | *flags = of_convert_gpio_flags(of_flags); |
d449991c | 640 | |
ea713bc4 LW |
641 | return desc; |
642 | } | |
643 | ||
f625d460 | 644 | /** |
fd7337fd | 645 | * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API |
f625d460 | 646 | * @np: device node to get GPIO from |
be715343 | 647 | * @chip: GPIO chip whose hog is parsed |
a79fead5 | 648 | * @idx: Index of the GPIO to parse |
f625d460 | 649 | * @name: GPIO line name |
fed7026a AS |
650 | * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from |
651 | * of_find_gpio() or of_parse_own_gpio() | |
f625d460 BP |
652 | * @dflags: gpiod_flags - optional GPIO initialization flags |
653 | * | |
654 | * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno | |
655 | * value on the error condition. | |
656 | */ | |
fd7337fd | 657 | static struct gpio_desc *of_parse_own_gpio(struct device_node *np, |
be715343 | 658 | struct gpio_chip *chip, |
a79fead5 | 659 | unsigned int idx, const char **name, |
fed7026a | 660 | unsigned long *lflags, |
fd7337fd | 661 | enum gpiod_flags *dflags) |
f625d460 BP |
662 | { |
663 | struct device_node *chip_np; | |
664 | enum of_gpio_flags xlate_flags; | |
be715343 MY |
665 | struct of_phandle_args gpiospec; |
666 | struct gpio_desc *desc; | |
a79fead5 | 667 | unsigned int i; |
f625d460 | 668 | u32 tmp; |
3f9547e1 | 669 | int ret; |
f625d460 | 670 | |
70d0fc42 | 671 | chip_np = dev_of_node(&chip->gpiodev->dev); |
f625d460 BP |
672 | if (!chip_np) |
673 | return ERR_PTR(-EINVAL); | |
674 | ||
675 | xlate_flags = 0; | |
2d6c06f5 | 676 | *lflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
40941954 | 677 | *dflags = GPIOD_ASIS; |
f625d460 BP |
678 | |
679 | ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp); | |
680 | if (ret) | |
681 | return ERR_PTR(ret); | |
682 | ||
be715343 MY |
683 | gpiospec.np = chip_np; |
684 | gpiospec.args_count = tmp; | |
f625d460 | 685 | |
a79fead5 GU |
686 | for (i = 0; i < tmp; i++) { |
687 | ret = of_property_read_u32_index(np, "gpios", idx * tmp + i, | |
688 | &gpiospec.args[i]); | |
689 | if (ret) | |
690 | return ERR_PTR(ret); | |
691 | } | |
f625d460 | 692 | |
99468c1a | 693 | desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags); |
be715343 MY |
694 | if (IS_ERR(desc)) |
695 | return desc; | |
f625d460 | 696 | |
d9e7f0e3 | 697 | *lflags = of_convert_gpio_flags(xlate_flags); |
f625d460 BP |
698 | |
699 | if (of_property_read_bool(np, "input")) | |
700 | *dflags |= GPIOD_IN; | |
701 | else if (of_property_read_bool(np, "output-low")) | |
702 | *dflags |= GPIOD_OUT_LOW; | |
703 | else if (of_property_read_bool(np, "output-high")) | |
704 | *dflags |= GPIOD_OUT_HIGH; | |
705 | else { | |
62cdcb6c RH |
706 | pr_warn("GPIO line %d (%pOFn): no hogging state specified, bailing out\n", |
707 | desc_to_gpio(desc), np); | |
f625d460 BP |
708 | return ERR_PTR(-EINVAL); |
709 | } | |
710 | ||
711 | if (name && of_property_read_string(np, "line-name", name)) | |
712 | *name = np->name; | |
713 | ||
be715343 | 714 | return desc; |
f625d460 BP |
715 | } |
716 | ||
bc21077e GU |
717 | /** |
718 | * of_gpiochip_add_hog - Add all hogs in a hog device node | |
719 | * @chip: gpio chip to act on | |
720 | * @hog: device node describing the hogs | |
721 | * | |
722 | * Returns error if it fails otherwise 0 on success. | |
723 | */ | |
724 | static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog) | |
725 | { | |
726 | enum gpiod_flags dflags; | |
727 | struct gpio_desc *desc; | |
728 | unsigned long lflags; | |
729 | const char *name; | |
730 | unsigned int i; | |
731 | int ret; | |
732 | ||
733 | for (i = 0;; i++) { | |
734 | desc = of_parse_own_gpio(hog, chip, i, &name, &lflags, &dflags); | |
735 | if (IS_ERR(desc)) | |
736 | break; | |
737 | ||
738 | ret = gpiod_hog(desc, name, lflags, dflags); | |
739 | if (ret < 0) | |
740 | return ret; | |
63636d95 GU |
741 | |
742 | #ifdef CONFIG_OF_DYNAMIC | |
743 | desc->hog = hog; | |
744 | #endif | |
bc21077e GU |
745 | } |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
f625d460 | 750 | /** |
fd7337fd | 751 | * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions |
f625d460 BP |
752 | * @chip: gpio chip to act on |
753 | * | |
754 | * This is only used by of_gpiochip_add to request/set GPIO initial | |
755 | * configuration. | |
ead066e6 | 756 | * It returns error if it fails otherwise 0 on success. |
f625d460 | 757 | */ |
dfbd379b | 758 | static int of_gpiochip_scan_gpios(struct gpio_chip *chip) |
f625d460 | 759 | { |
f625d460 | 760 | struct device_node *np; |
dfbd379b | 761 | int ret; |
f625d460 | 762 | |
70d0fc42 | 763 | for_each_available_child_of_node(dev_of_node(&chip->gpiodev->dev), np) { |
f625d460 BP |
764 | if (!of_property_read_bool(np, "gpio-hog")) |
765 | continue; | |
766 | ||
bc21077e GU |
767 | ret = of_gpiochip_add_hog(chip, np); |
768 | if (ret < 0) { | |
769 | of_node_put(np); | |
770 | return ret; | |
09e258af | 771 | } |
63636d95 GU |
772 | |
773 | of_node_set_flag(np, OF_POPULATED); | |
f625d460 | 774 | } |
dfbd379b LD |
775 | |
776 | return 0; | |
f625d460 BP |
777 | } |
778 | ||
63636d95 GU |
779 | #ifdef CONFIG_OF_DYNAMIC |
780 | /** | |
781 | * of_gpiochip_remove_hog - Remove all hogs in a hog device node | |
782 | * @chip: gpio chip to act on | |
783 | * @hog: device node describing the hogs | |
784 | */ | |
785 | static void of_gpiochip_remove_hog(struct gpio_chip *chip, | |
786 | struct device_node *hog) | |
787 | { | |
80c78fbe | 788 | struct gpio_desc *desc; |
63636d95 | 789 | |
57017edd | 790 | for_each_gpio_desc_with_flag(chip, desc, FLAG_IS_HOGGED) |
80c78fbe AS |
791 | if (desc->hog == hog) |
792 | gpiochip_free_own_desc(desc); | |
63636d95 GU |
793 | } |
794 | ||
795 | static int of_gpiochip_match_node(struct gpio_chip *chip, void *data) | |
796 | { | |
597a8a88 | 797 | return device_match_of_node(&chip->gpiodev->dev, data); |
63636d95 GU |
798 | } |
799 | ||
800 | static struct gpio_chip *of_find_gpiochip_by_node(struct device_node *np) | |
801 | { | |
802 | return gpiochip_find(np, of_gpiochip_match_node); | |
803 | } | |
804 | ||
805 | static int of_gpio_notify(struct notifier_block *nb, unsigned long action, | |
806 | void *arg) | |
807 | { | |
808 | struct of_reconfig_data *rd = arg; | |
809 | struct gpio_chip *chip; | |
810 | int ret; | |
811 | ||
812 | /* | |
813 | * This only supports adding and removing complete gpio-hog nodes. | |
814 | * Modifying an existing gpio-hog node is not supported (except for | |
815 | * changing its "status" property, which is treated the same as | |
816 | * addition/removal). | |
817 | */ | |
818 | switch (of_reconfig_get_state_change(action, arg)) { | |
819 | case OF_RECONFIG_CHANGE_ADD: | |
820 | if (!of_property_read_bool(rd->dn, "gpio-hog")) | |
821 | return NOTIFY_OK; /* not for us */ | |
822 | ||
823 | if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) | |
824 | return NOTIFY_OK; | |
825 | ||
826 | chip = of_find_gpiochip_by_node(rd->dn->parent); | |
827 | if (chip == NULL) | |
828 | return NOTIFY_OK; /* not for us */ | |
829 | ||
830 | ret = of_gpiochip_add_hog(chip, rd->dn); | |
831 | if (ret < 0) { | |
832 | pr_err("%s: failed to add hogs for %pOF\n", __func__, | |
833 | rd->dn); | |
834 | of_node_clear_flag(rd->dn, OF_POPULATED); | |
835 | return notifier_from_errno(ret); | |
836 | } | |
837 | break; | |
838 | ||
839 | case OF_RECONFIG_CHANGE_REMOVE: | |
840 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) | |
841 | return NOTIFY_OK; /* already depopulated */ | |
842 | ||
843 | chip = of_find_gpiochip_by_node(rd->dn->parent); | |
844 | if (chip == NULL) | |
845 | return NOTIFY_OK; /* not for us */ | |
846 | ||
847 | of_gpiochip_remove_hog(chip, rd->dn); | |
848 | of_node_clear_flag(rd->dn, OF_POPULATED); | |
849 | break; | |
850 | } | |
851 | ||
852 | return NOTIFY_OK; | |
853 | } | |
854 | ||
855 | struct notifier_block gpio_of_notifier = { | |
856 | .notifier_call = of_gpio_notify, | |
857 | }; | |
858 | #endif /* CONFIG_OF_DYNAMIC */ | |
859 | ||
863fbf49 | 860 | /** |
67049c50 | 861 | * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags |
a19e3da5 | 862 | * @gc: pointer to the gpio_chip structure |
67049c50 | 863 | * @gpiospec: GPIO specifier as found in the device tree |
b908b53d | 864 | * @flags: a flags pointer to fill in |
863fbf49 AV |
865 | * |
866 | * This is simple translation function, suitable for the most 1:1 mapped | |
67049c50 | 867 | * GPIO chips. This function performs only one sanity check: whether GPIO |
863fbf49 AV |
868 | * is less than ngpios (that is specified in the gpio_chip). |
869 | */ | |
b0c7e73b GU |
870 | static int of_gpio_simple_xlate(struct gpio_chip *gc, |
871 | const struct of_phandle_args *gpiospec, | |
872 | u32 *flags) | |
863fbf49 | 873 | { |
b908b53d AV |
874 | /* |
875 | * We're discouraging gpio_cells < 2, since that way you'll have to | |
20a8a968 | 876 | * write your own xlate function (that will have to retrieve the GPIO |
b908b53d AV |
877 | * number and the flags from a single gpio cell -- this is possible, |
878 | * but not recommended). | |
879 | */ | |
a19e3da5 | 880 | if (gc->of_gpio_n_cells < 2) { |
b908b53d AV |
881 | WARN_ON(1); |
882 | return -EINVAL; | |
883 | } | |
884 | ||
15c9a0ac GL |
885 | if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) |
886 | return -EINVAL; | |
887 | ||
6270d830 | 888 | if (gpiospec->args[0] >= gc->ngpio) |
863fbf49 AV |
889 | return -EINVAL; |
890 | ||
b908b53d | 891 | if (flags) |
15c9a0ac | 892 | *flags = gpiospec->args[1]; |
b908b53d | 893 | |
15c9a0ac | 894 | return gpiospec->args[0]; |
863fbf49 | 895 | } |
863fbf49 | 896 | |
a99cc668 AB |
897 | #if IS_ENABLED(CONFIG_OF_GPIO_MM_GPIOCHIP) |
898 | #include <linux/gpio/legacy-of-mm-gpiochip.h> | |
863fbf49 | 899 | /** |
3208b0f0 | 900 | * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank) |
863fbf49 AV |
901 | * @np: device node of the GPIO chip |
902 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
3208b0f0 | 903 | * @data: driver data to store in the struct gpio_chip |
863fbf49 AV |
904 | * |
905 | * To use this function you should allocate and fill mm_gc with: | |
906 | * | |
907 | * 1) In the gpio_chip structure: | |
908 | * - all the callbacks | |
a19e3da5 AV |
909 | * - of_gpio_n_cells |
910 | * - of_xlate callback (optional) | |
863fbf49 AV |
911 | * |
912 | * 3) In the of_mm_gpio_chip structure: | |
913 | * - save_regs callback (optional) | |
914 | * | |
915 | * If succeeded, this function will map bank's memory and will | |
916 | * do all necessary work for you. Then you'll able to use .regs | |
917 | * to manage GPIOs from the callbacks. | |
918 | */ | |
3208b0f0 LW |
919 | int of_mm_gpiochip_add_data(struct device_node *np, |
920 | struct of_mm_gpio_chip *mm_gc, | |
921 | void *data) | |
863fbf49 AV |
922 | { |
923 | int ret = -ENOMEM; | |
a19e3da5 | 924 | struct gpio_chip *gc = &mm_gc->gc; |
863fbf49 | 925 | |
7eb6ce2f | 926 | gc->label = kasprintf(GFP_KERNEL, "%pOF", np); |
863fbf49 AV |
927 | if (!gc->label) |
928 | goto err0; | |
929 | ||
930 | mm_gc->regs = of_iomap(np, 0); | |
931 | if (!mm_gc->regs) | |
932 | goto err1; | |
933 | ||
21451155 | 934 | gc->base = -1; |
863fbf49 | 935 | |
863fbf49 AV |
936 | if (mm_gc->save_regs) |
937 | mm_gc->save_regs(mm_gc); | |
938 | ||
77289b2f AS |
939 | fwnode_handle_put(mm_gc->gc.fwnode); |
940 | mm_gc->gc.fwnode = fwnode_handle_get(of_fwnode_handle(np)); | |
863fbf49 | 941 | |
3208b0f0 | 942 | ret = gpiochip_add_data(gc, data); |
863fbf49 AV |
943 | if (ret) |
944 | goto err2; | |
945 | ||
863fbf49 AV |
946 | return 0; |
947 | err2: | |
5d07a692 | 948 | of_node_put(np); |
863fbf49 AV |
949 | iounmap(mm_gc->regs); |
950 | err1: | |
951 | kfree(gc->label); | |
952 | err0: | |
7eb6ce2f | 953 | pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret); |
863fbf49 AV |
954 | return ret; |
955 | } | |
6d662455 | 956 | EXPORT_SYMBOL_GPL(of_mm_gpiochip_add_data); |
594fa265 | 957 | |
d621e8ba RRD |
958 | /** |
959 | * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank) | |
960 | * @mm_gc: pointer to the of_mm_gpio_chip allocated structure | |
961 | */ | |
962 | void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) | |
963 | { | |
964 | struct gpio_chip *gc = &mm_gc->gc; | |
965 | ||
d621e8ba RRD |
966 | gpiochip_remove(gc); |
967 | iounmap(mm_gc->regs); | |
968 | kfree(gc->label); | |
969 | } | |
6d662455 | 970 | EXPORT_SYMBOL_GPL(of_mm_gpiochip_remove); |
a99cc668 | 971 | #endif |
d621e8ba | 972 | |
f23f1516 | 973 | #ifdef CONFIG_PINCTRL |
28355f81 | 974 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) |
f23f1516 | 975 | { |
f23f1516 | 976 | struct of_phandle_args pinspec; |
1e63d7b9 | 977 | struct pinctrl_dev *pctldev; |
70d0fc42 | 978 | struct device_node *np; |
f23f1516 | 979 | int index = 0, ret; |
586a87e6 CR |
980 | const char *name; |
981 | static const char group_names_propname[] = "gpio-ranges-group-names"; | |
982 | struct property *group_names; | |
f23f1516 | 983 | |
70d0fc42 | 984 | np = dev_of_node(&chip->gpiodev->dev); |
f23f1516 | 985 | if (!np) |
28355f81 | 986 | return 0; |
f23f1516 | 987 | |
586a87e6 CR |
988 | group_names = of_find_property(np, group_names_propname, NULL); |
989 | ||
ad4e1a7c | 990 | for (;; index++) { |
d9fe0039 SW |
991 | ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, |
992 | index, &pinspec); | |
f23f1516 SH |
993 | if (ret) |
994 | break; | |
995 | ||
1e63d7b9 | 996 | pctldev = of_pinctrl_get(pinspec.np); |
602cf638 | 997 | of_node_put(pinspec.np); |
1e63d7b9 | 998 | if (!pctldev) |
28355f81 | 999 | return -EPROBE_DEFER; |
f23f1516 | 1000 | |
586a87e6 CR |
1001 | if (pinspec.args[2]) { |
1002 | if (group_names) { | |
72858602 | 1003 | of_property_read_string_index(np, |
586a87e6 CR |
1004 | group_names_propname, |
1005 | index, &name); | |
1006 | if (strlen(name)) { | |
7eb6ce2f RH |
1007 | pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n", |
1008 | np); | |
586a87e6 CR |
1009 | break; |
1010 | } | |
1011 | } | |
1012 | /* npins != 0: linear range */ | |
1013 | ret = gpiochip_add_pin_range(chip, | |
1014 | pinctrl_dev_get_devname(pctldev), | |
1015 | pinspec.args[0], | |
1016 | pinspec.args[1], | |
1017 | pinspec.args[2]); | |
1018 | if (ret) | |
28355f81 | 1019 | return ret; |
586a87e6 CR |
1020 | } else { |
1021 | /* npins == 0: special range */ | |
1022 | if (pinspec.args[1]) { | |
7eb6ce2f RH |
1023 | pr_err("%pOF: Illegal gpio-range format.\n", |
1024 | np); | |
586a87e6 CR |
1025 | break; |
1026 | } | |
1027 | ||
1028 | if (!group_names) { | |
7eb6ce2f RH |
1029 | pr_err("%pOF: GPIO group range requested but no %s property.\n", |
1030 | np, group_names_propname); | |
586a87e6 CR |
1031 | break; |
1032 | } | |
1033 | ||
1034 | ret = of_property_read_string_index(np, | |
1035 | group_names_propname, | |
1036 | index, &name); | |
1037 | if (ret) | |
1038 | break; | |
1039 | ||
1040 | if (!strlen(name)) { | |
7eb6ce2f RH |
1041 | pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n", |
1042 | np); | |
586a87e6 CR |
1043 | break; |
1044 | } | |
1045 | ||
1046 | ret = gpiochip_add_pingroup_range(chip, pctldev, | |
1047 | pinspec.args[0], name); | |
1048 | if (ret) | |
28355f81 | 1049 | return ret; |
586a87e6 | 1050 | } |
ad4e1a7c | 1051 | } |
28355f81 TV |
1052 | |
1053 | return 0; | |
f23f1516 SH |
1054 | } |
1055 | ||
f23f1516 | 1056 | #else |
28355f81 | 1057 | static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } |
f23f1516 SH |
1058 | #endif |
1059 | ||
28355f81 | 1060 | int of_gpiochip_add(struct gpio_chip *chip) |
391c970c | 1061 | { |
8afe8255 | 1062 | struct device_node *np; |
f0d1ab05 | 1063 | int ret; |
28355f81 | 1064 | |
70d0fc42 | 1065 | np = dev_of_node(&chip->gpiodev->dev); |
8afe8255 | 1066 | if (!np) |
28355f81 | 1067 | return 0; |
391c970c AV |
1068 | |
1069 | if (!chip->of_xlate) { | |
1070 | chip->of_gpio_n_cells = 2; | |
1071 | chip->of_xlate = of_gpio_simple_xlate; | |
1072 | } | |
1073 | ||
1020dfd1 MY |
1074 | if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS) |
1075 | return -EINVAL; | |
1076 | ||
f0d1ab05 LW |
1077 | ret = of_gpiochip_add_pin_range(chip); |
1078 | if (ret) | |
1079 | return ret; | |
28355f81 | 1080 | |
8afe8255 | 1081 | fwnode_handle_get(chip->fwnode); |
f625d460 | 1082 | |
f0d1ab05 | 1083 | ret = of_gpiochip_scan_gpios(chip); |
2f4133bb | 1084 | if (ret) |
8afe8255 | 1085 | fwnode_handle_put(chip->fwnode); |
f7299d44 | 1086 | |
f0d1ab05 | 1087 | return ret; |
391c970c AV |
1088 | } |
1089 | ||
1090 | void of_gpiochip_remove(struct gpio_chip *chip) | |
1091 | { | |
8afe8255 | 1092 | fwnode_handle_put(chip->fwnode); |
391c970c | 1093 | } |