1 // SPDX-License-Identifier: GPL-2.0+
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>
8 */
9
10 #include <linux/device.h>
11 #include <linux/err.h>
12 #include <linux/errno.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/of_address.h>
17 #include <linux/of_gpio.h>
18 #include <linux/pinctrl/pinctrl.h>
19 #include <linux/slab.h>
20 #include <linux/string.h>
21
22 #include <linux/gpio/consumer.h>
23 #include <linux/gpio/machine.h>
24
25 #include "gpiolib.h"
26 #include "gpiolib-of.h"
27
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
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: The empty GPIO specifiers count too.
50 *
51 * Returns:
52 * Either number of GPIOs defined in the property, or
53 * * %-EINVAL for an incorrectly formed "gpios" property, or
54 * * %-ENOENT for a missing "gpios" property.
55 *
56 * Example::
57 *
58 * gpios = <0
59 * &gpio1 1 2
60 * 0
61 * &gpio2 3 4>;
62 *
63 * The above example defines four GPIOs, two of which are not specified.
64 * This function will return '4'
65 */
of_gpio_named_count(const struct device_node * np,const char * propname)66 static int of_gpio_named_count(const struct device_node *np,
67 const char *propname)
68 {
69 return of_count_phandle_with_args(np, propname, "#gpio-cells");
70 }
71
72 /**
73 * of_gpio_spi_cs_get_count() - special GPIO counting for SPI
74 * @np: Consuming device node
75 * @con_id: Function within the GPIO consumer
76 *
77 * Some elder GPIO controllers need special quirks. Currently we handle
78 * the Freescale and PPC GPIO controller with bindings that doesn't use the
79 * established "cs-gpios" for chip selects but instead rely on
80 * "gpios" for the chip select lines. If we detect this, we redirect
81 * the counting of "cs-gpios" to count "gpios" transparent to the
82 * driver.
83 *
84 * Returns:
85 * Either number of GPIOs defined in the property, or
86 * * %-EINVAL for an incorrectly formed "gpios" property, or
87 * * %-ENOENT for a missing "gpios" property.
88 */
of_gpio_spi_cs_get_count(const struct device_node * np,const char * con_id)89 static int of_gpio_spi_cs_get_count(const struct device_node *np,
90 const char *con_id)
91 {
92 if (!IS_ENABLED(CONFIG_SPI_MASTER))
93 return 0;
94 if (!con_id || strcmp(con_id, "cs"))
95 return 0;
96 if (!of_device_is_compatible(np, "fsl,spi") &&
97 !of_device_is_compatible(np, "aeroflexgaisler,spictrl") &&
98 !of_device_is_compatible(np, "ibm,ppc4xx-spi"))
99 return 0;
100 return of_gpio_named_count(np, "gpios");
101 }
102
of_gpio_count(const struct fwnode_handle * fwnode,const char * con_id)103 int of_gpio_count(const struct fwnode_handle *fwnode, const char *con_id)
104 {
105 const struct device_node *np = to_of_node(fwnode);
106 int ret;
107 char propname[32];
108
109 ret = of_gpio_spi_cs_get_count(np, con_id);
110 if (ret > 0)
111 return ret;
112
113 for_each_gpio_property_name(propname, con_id) {
114 ret = of_gpio_named_count(np, propname);
115 if (ret > 0)
116 break;
117 }
118 return ret ? ret : -ENOENT;
119 }
120
of_gpiochip_match_node_and_xlate(struct gpio_chip * chip,const void * data)121 static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip,
122 const void *data)
123 {
124 const struct of_phandle_args *gpiospec = data;
125
126 return device_match_of_node(&chip->gpiodev->dev, gpiospec->np) &&
127 chip->of_xlate &&
128 chip->of_xlate(chip, gpiospec, NULL) >= 0;
129 }
130
131 static struct gpio_device *
of_find_gpio_device_by_xlate(const struct of_phandle_args * gpiospec)132 of_find_gpio_device_by_xlate(const struct of_phandle_args *gpiospec)
133 {
134 return gpio_device_find(gpiospec, of_gpiochip_match_node_and_xlate);
135 }
136
of_xlate_and_get_gpiod_flags(struct gpio_chip * chip,struct of_phandle_args * gpiospec,enum of_gpio_flags * flags)137 static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip,
138 struct of_phandle_args *gpiospec,
139 enum of_gpio_flags *flags)
140 {
141 int ret;
142
143 if (chip->of_gpio_n_cells != gpiospec->args_count)
144 return ERR_PTR(-EINVAL);
145
146 ret = chip->of_xlate(chip, gpiospec, flags);
147 if (ret < 0)
148 return ERR_PTR(ret);
149
150 return gpiochip_get_desc(chip, ret);
151 }
152
153 /*
154 * Overrides stated polarity of a gpio line and warns when there is a
155 * discrepancy.
156 */
of_gpio_quirk_polarity(const struct device_node * np,bool active_high,enum of_gpio_flags * flags)157 static void of_gpio_quirk_polarity(const struct device_node *np,
158 bool active_high,
159 enum of_gpio_flags *flags)
160 {
161 if (active_high) {
162 if (*flags & OF_GPIO_ACTIVE_LOW) {
163 pr_warn("%s GPIO handle specifies active low - ignored\n",
164 of_node_full_name(np));
165 *flags &= ~OF_GPIO_ACTIVE_LOW;
166 }
167 } else {
168 if (!(*flags & OF_GPIO_ACTIVE_LOW))
169 pr_info("%s enforce active low on GPIO handle\n",
170 of_node_full_name(np));
171 *flags |= OF_GPIO_ACTIVE_LOW;
172 }
173 }
174
175 /*
176 * This quirk does static polarity overrides in cases where existing
177 * DTS specified incorrect polarity.
178 */
of_gpio_try_fixup_polarity(const struct device_node * np,const char * propname,enum of_gpio_flags * flags)179 static void of_gpio_try_fixup_polarity(const struct device_node *np,
180 const char *propname,
181 enum of_gpio_flags *flags)
182 {
183 static const struct {
184 const char *compatible;
185 const char *propname;
186 bool active_high;
187 } gpios[] = {
188 #if IS_ENABLED(CONFIG_LCD_HX8357)
189 /*
190 * Himax LCD controllers used incorrectly named
191 * "gpios-reset" property and also specified wrong
192 * polarity.
193 */
194 { "himax,hx8357", "gpios-reset", false },
195 { "himax,hx8369", "gpios-reset", false },
196 #endif
197 #if IS_ENABLED(CONFIG_MTD_NAND_JZ4780)
198 /*
199 * The rb-gpios semantics was undocumented and qi,lb60 (along with
200 * the ingenic driver) got it wrong. The active state encodes the
201 * NAND ready state, which is high level. Since there's no signal
202 * inverter on this board, it should be active-high. Let's fix that
203 * here for older DTs so we can re-use the generic nand_gpio_waitrdy()
204 * helper, and be consistent with what other drivers do.
205 */
206 { "qi,lb60", "rb-gpios", true },
207 #endif
208 #if IS_ENABLED(CONFIG_IEEE802154_CA8210)
209 /*
210 * According to the datasheet, the NRST pin 27 is an active-low
211 * signal. However, the device tree schema and admittedly
212 * the out-of-tree implementations have been used for a long
213 * time incorrectly by describing reset GPIO as active-high.
214 */
215 { "cascoda,ca8210", "reset-gpio", false },
216 #endif
217 #if IS_ENABLED(CONFIG_PCI_LANTIQ)
218 /*
219 * According to the PCI specification, the RST# pin is an
220 * active-low signal. However, most of the device trees that
221 * have been widely used for a long time incorrectly describe
222 * reset GPIO as active-high, and were also using wrong name
223 * for the property.
224 */
225 { "lantiq,pci-xway", "gpio-reset", false },
226 #endif
227 #if IS_ENABLED(CONFIG_REGULATOR_S5M8767)
228 /*
229 * According to S5M8767, the DVS and DS pin are
230 * active-high signals. However, exynos5250-spring.dts use
231 * active-low setting.
232 */
233 { "samsung,s5m8767-pmic", "s5m8767,pmic-buck-dvs-gpios", true },
234 { "samsung,s5m8767-pmic", "s5m8767,pmic-buck-ds-gpios", true },
235 #endif
236 #if IS_ENABLED(CONFIG_TOUCHSCREEN_TSC2005)
237 /*
238 * DTS for Nokia N900 incorrectly specified "active high"
239 * polarity for the reset line, while the chip actually
240 * treats it as "active low".
241 */
242 { "ti,tsc2005", "reset-gpios", false },
243 #endif
244 };
245 unsigned int i;
246
247 for (i = 0; i < ARRAY_SIZE(gpios); i++) {
248 if (of_device_is_compatible(np, gpios[i].compatible) &&
249 !strcmp(propname, gpios[i].propname)) {
250 of_gpio_quirk_polarity(np, gpios[i].active_high, flags);
251 break;
252 }
253 }
254 }
255
of_gpio_set_polarity_by_property(const struct device_node * np,const char * propname,enum of_gpio_flags * flags)256 static void of_gpio_set_polarity_by_property(const struct device_node *np,
257 const char *propname,
258 enum of_gpio_flags *flags)
259 {
260 const struct device_node *np_compat = np;
261 const struct device_node *np_propname = np;
262 static const struct {
263 const char *compatible;
264 const char *gpio_propname;
265 const char *polarity_propname;
266 } gpios[] = {
267 #if IS_ENABLED(CONFIG_FEC)
268 /* Freescale Fast Ethernet Controller */
269 { "fsl,imx25-fec", "phy-reset-gpios", "phy-reset-active-high" },
270 { "fsl,imx27-fec", "phy-reset-gpios", "phy-reset-active-high" },
271 { "fsl,imx28-fec", "phy-reset-gpios", "phy-reset-active-high" },
272 { "fsl,imx6q-fec", "phy-reset-gpios", "phy-reset-active-high" },
273 { "fsl,mvf600-fec", "phy-reset-gpios", "phy-reset-active-high" },
274 { "fsl,imx6sx-fec", "phy-reset-gpios", "phy-reset-active-high" },
275 { "fsl,imx6ul-fec", "phy-reset-gpios", "phy-reset-active-high" },
276 { "fsl,imx8mq-fec", "phy-reset-gpios", "phy-reset-active-high" },
277 { "fsl,imx8qm-fec", "phy-reset-gpios", "phy-reset-active-high" },
278 { "fsl,s32v234-fec", "phy-reset-gpios", "phy-reset-active-high" },
279 #endif
280 #if IS_ENABLED(CONFIG_MMC_ATMELMCI)
281 { "atmel,hsmci", "cd-gpios", "cd-inverted" },
282 #endif
283 #if IS_ENABLED(CONFIG_PCI_IMX6)
284 { "fsl,imx6q-pcie", "reset-gpio", "reset-gpio-active-high" },
285 { "fsl,imx6sx-pcie", "reset-gpio", "reset-gpio-active-high" },
286 { "fsl,imx6qp-pcie", "reset-gpio", "reset-gpio-active-high" },
287 { "fsl,imx7d-pcie", "reset-gpio", "reset-gpio-active-high" },
288 { "fsl,imx8mq-pcie", "reset-gpio", "reset-gpio-active-high" },
289 { "fsl,imx8mm-pcie", "reset-gpio", "reset-gpio-active-high" },
290 { "fsl,imx8mp-pcie", "reset-gpio", "reset-gpio-active-high" },
291 #endif
292
293 /*
294 * The regulator GPIO handles are specified such that the
295 * presence or absence of "enable-active-high" solely controls
296 * the polarity of the GPIO line. Any phandle flags must
297 * be actively ignored.
298 */
299 #if IS_ENABLED(CONFIG_REGULATOR_FIXED_VOLTAGE)
300 { "regulator-fixed", "gpios", "enable-active-high" },
301 { "regulator-fixed", "gpio", "enable-active-high" },
302 { "reg-fixed-voltage", "gpios", "enable-active-high" },
303 { "reg-fixed-voltage", "gpio", "enable-active-high" },
304 #endif
305 #if IS_ENABLED(CONFIG_REGULATOR_GPIO)
306 { "regulator-gpio", "enable-gpio", "enable-active-high" },
307 { "regulator-gpio", "enable-gpios", "enable-active-high" },
308 #endif
309 };
310 unsigned int i;
311 bool active_high;
312
313 #if IS_ENABLED(CONFIG_MMC_ATMELMCI)
314 /*
315 * The Atmel HSMCI has compatible property in the parent node and
316 * gpio property in a child node
317 */
318 if (of_device_is_compatible(np->parent, "atmel,hsmci")) {
319 np_compat = np->parent;
320 np_propname = np;
321 }
322 #endif
323
324 for (i = 0; i < ARRAY_SIZE(gpios); i++) {
325 if (of_device_is_compatible(np_compat, gpios[i].compatible) &&
326 !strcmp(propname, gpios[i].gpio_propname)) {
327 active_high = of_property_read_bool(np_propname,
328 gpios[i].polarity_propname);
329 of_gpio_quirk_polarity(np, active_high, flags);
330 break;
331 }
332 }
333 }
334
of_gpio_flags_quirks(const struct device_node * np,const char * propname,enum of_gpio_flags * flags,int index)335 static void of_gpio_flags_quirks(const struct device_node *np,
336 const char *propname,
337 enum of_gpio_flags *flags,
338 int index)
339 {
340 of_gpio_try_fixup_polarity(np, propname, flags);
341 of_gpio_set_polarity_by_property(np, propname, flags);
342
343 /*
344 * Legacy open drain handling for fixed voltage regulators.
345 */
346 if (IS_ENABLED(CONFIG_REGULATOR) &&
347 of_device_is_compatible(np, "reg-fixed-voltage") &&
348 of_property_read_bool(np, "gpio-open-drain")) {
349 *flags |= (OF_GPIO_SINGLE_ENDED | OF_GPIO_OPEN_DRAIN);
350 pr_info("%s uses legacy open drain flag - update the DTS if you can\n",
351 of_node_full_name(np));
352 }
353
354 /*
355 * Legacy handling of SPI active high chip select. If we have a
356 * property named "cs-gpios" we need to inspect the child node
357 * to determine if the flags should have inverted semantics.
358 */
359 if (IS_ENABLED(CONFIG_SPI_MASTER) && !strcmp(propname, "cs-gpios") &&
360 of_property_present(np, "cs-gpios")) {
361 u32 cs;
362 int ret;
363
364 for_each_child_of_node_scoped(np, child) {
365 ret = of_property_read_u32(child, "reg", &cs);
366 if (ret)
367 continue;
368 if (cs == index) {
369 /*
370 * SPI children have active low chip selects
371 * by default. This can be specified negatively
372 * by just omitting "spi-cs-high" in the
373 * device node, or actively by tagging on
374 * GPIO_ACTIVE_LOW as flag in the device
375 * tree. If the line is simultaneously
376 * tagged as active low in the device tree
377 * and has the "spi-cs-high" set, we get a
378 * conflict and the "spi-cs-high" flag will
379 * take precedence.
380 */
381 bool active_high = of_property_read_bool(child,
382 "spi-cs-high");
383 of_gpio_quirk_polarity(child, active_high,
384 flags);
385 break;
386 }
387 }
388 }
389
390 /* Legacy handling of stmmac's active-low PHY reset line */
391 if (IS_ENABLED(CONFIG_STMMAC_ETH) &&
392 !strcmp(propname, "snps,reset-gpio") &&
393 of_property_read_bool(np, "snps,reset-active-low"))
394 *flags |= OF_GPIO_ACTIVE_LOW;
395 }
396
397 /**
398 * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
399 * @np: device node to get GPIO from
400 * @propname: property name containing gpio specifier(s)
401 * @index: index of the GPIO
402 * @flags: a flags pointer to fill in
403 *
404 * Returns:
405 * GPIO descriptor to use with Linux GPIO API, or one of the errno
406 * value on the error condition. If @flags is not NULL the function also fills
407 * in flags for the GPIO.
408 */
of_get_named_gpiod_flags(const struct device_node * np,const char * propname,int index,enum of_gpio_flags * flags)409 static struct gpio_desc *of_get_named_gpiod_flags(const struct device_node *np,
410 const char *propname, int index, enum of_gpio_flags *flags)
411 {
412 struct of_phandle_args gpiospec;
413 struct gpio_desc *desc;
414 int ret;
415
416 ret = of_parse_phandle_with_args_map(np, propname, "gpio", index,
417 &gpiospec);
418 if (ret) {
419 pr_debug("%s: can't parse '%s' property of node '%pOF[%d]'\n",
420 __func__, propname, np, index);
421 return ERR_PTR(ret);
422 }
423
424 struct gpio_device *gdev __free(gpio_device_put) =
425 of_find_gpio_device_by_xlate(&gpiospec);
426 if (!gdev) {
427 desc = ERR_PTR(-EPROBE_DEFER);
428 goto out;
429 }
430
431 desc = of_xlate_and_get_gpiod_flags(gpio_device_get_chip(gdev),
432 &gpiospec, flags);
433 if (IS_ERR(desc))
434 goto out;
435
436 if (flags)
437 of_gpio_flags_quirks(np, propname, flags, index);
438
439 pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n",
440 __func__, propname, np, index,
441 PTR_ERR_OR_ZERO(desc));
442
443 out:
444 of_node_put(gpiospec.np);
445
446 return desc;
447 }
448
449 /**
450 * of_get_named_gpio() - Get a GPIO number to use with GPIO API
451 * @np: device node to get GPIO from
452 * @propname: Name of property containing gpio specifier(s)
453 * @index: index of the GPIO
454 *
455 * **DEPRECATED** This function is deprecated and must not be used in new code.
456 *
457 * Returns:
458 * GPIO number to use with Linux generic GPIO API, or one of the errno
459 * value on the error condition.
460 */
of_get_named_gpio(const struct device_node * np,const char * propname,int index)461 int of_get_named_gpio(const struct device_node *np, const char *propname,
462 int index)
463 {
464 struct gpio_desc *desc;
465
466 desc = of_get_named_gpiod_flags(np, propname, index, NULL);
467
468 if (IS_ERR(desc))
469 return PTR_ERR(desc);
470 else
471 return desc_to_gpio(desc);
472 }
473 EXPORT_SYMBOL_GPL(of_get_named_gpio);
474
475 /* Converts gpio_lookup_flags into bitmask of GPIO_* values */
of_convert_gpio_flags(enum of_gpio_flags flags)476 static unsigned long of_convert_gpio_flags(enum of_gpio_flags flags)
477 {
478 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
479
480 if (flags & OF_GPIO_ACTIVE_LOW)
481 lflags |= GPIO_ACTIVE_LOW;
482
483 if (flags & OF_GPIO_SINGLE_ENDED) {
484 if (flags & OF_GPIO_OPEN_DRAIN)
485 lflags |= GPIO_OPEN_DRAIN;
486 else
487 lflags |= GPIO_OPEN_SOURCE;
488 }
489
490 if (flags & OF_GPIO_TRANSITORY)
491 lflags |= GPIO_TRANSITORY;
492
493 if (flags & OF_GPIO_PULL_UP)
494 lflags |= GPIO_PULL_UP;
495
496 if (flags & OF_GPIO_PULL_DOWN)
497 lflags |= GPIO_PULL_DOWN;
498
499 if (flags & OF_GPIO_PULL_DISABLE)
500 lflags |= GPIO_PULL_DISABLE;
501
502 return lflags;
503 }
504
of_find_gpio_rename(struct device_node * np,const char * con_id,unsigned int idx,enum of_gpio_flags * of_flags)505 static struct gpio_desc *of_find_gpio_rename(struct device_node *np,
506 const char *con_id,
507 unsigned int idx,
508 enum of_gpio_flags *of_flags)
509 {
510 static const struct of_rename_gpio {
511 const char *con_id;
512 const char *legacy_id; /* NULL - same as con_id */
513 /*
514 * Compatible string can be set to NULL in case where
515 * matching to a particular compatible is not practical,
516 * but it should only be done for gpio names that have
517 * vendor prefix to reduce risk of false positives.
518 * Addition of such entries is strongly discouraged.
519 */
520 const char *compatible;
521 } gpios[] = {
522 #if IS_ENABLED(CONFIG_LCD_HX8357)
523 /* Himax LCD controllers used "gpios-reset" */
524 { "reset", "gpios-reset", "himax,hx8357" },
525 { "reset", "gpios-reset", "himax,hx8369" },
526 #endif
527 #if IS_ENABLED(CONFIG_MFD_ARIZONA)
528 { "wlf,reset", NULL, NULL },
529 #endif
530 #if IS_ENABLED(CONFIG_RTC_DRV_MOXART)
531 { "rtc-data", "gpio-rtc-data", "moxa,moxart-rtc" },
532 { "rtc-sclk", "gpio-rtc-sclk", "moxa,moxart-rtc" },
533 { "rtc-reset", "gpio-rtc-reset", "moxa,moxart-rtc" },
534 #endif
535 #if IS_ENABLED(CONFIG_NFC_MRVL_I2C)
536 { "reset", "reset-n-io", "marvell,nfc-i2c" },
537 #endif
538 #if IS_ENABLED(CONFIG_NFC_MRVL_SPI)
539 { "reset", "reset-n-io", "marvell,nfc-spi" },
540 #endif
541 #if IS_ENABLED(CONFIG_NFC_MRVL_UART)
542 { "reset", "reset-n-io", "marvell,nfc-uart" },
543 { "reset", "reset-n-io", "mrvl,nfc-uart" },
544 #endif
545 #if IS_ENABLED(CONFIG_PCI_LANTIQ)
546 /* MIPS Lantiq PCI */
547 { "reset", "gpio-reset", "lantiq,pci-xway" },
548 #endif
549
550 /*
551 * Some regulator bindings happened before we managed to
552 * establish that GPIO properties should be named
553 * "foo-gpios" so we have this special kludge for them.
554 */
555 #if IS_ENABLED(CONFIG_REGULATOR_ARIZONA_LDO1)
556 { "wlf,ldoena", NULL, NULL }, /* Arizona */
557 #endif
558 #if IS_ENABLED(CONFIG_REGULATOR_WM8994)
559 { "wlf,ldo1ena", NULL, NULL }, /* WM8994 */
560 { "wlf,ldo2ena", NULL, NULL }, /* WM8994 */
561 #endif
562
563 #if IS_ENABLED(CONFIG_SND_SOC_CS42L56)
564 { "reset", "cirrus,gpio-nreset", "cirrus,cs42l56" },
565 #endif
566 #if IS_ENABLED(CONFIG_SND_SOC_MT2701_CS42448)
567 { "i2s1-in-sel-gpio1", NULL, "mediatek,mt2701-cs42448-machine" },
568 { "i2s1-in-sel-gpio2", NULL, "mediatek,mt2701-cs42448-machine" },
569 #endif
570 #if IS_ENABLED(CONFIG_SND_SOC_TLV320AIC3X)
571 { "reset", "gpio-reset", "ti,tlv320aic3x" },
572 { "reset", "gpio-reset", "ti,tlv320aic33" },
573 { "reset", "gpio-reset", "ti,tlv320aic3007" },
574 { "reset", "gpio-reset", "ti,tlv320aic3104" },
575 { "reset", "gpio-reset", "ti,tlv320aic3106" },
576 #endif
577 #if IS_ENABLED(CONFIG_SPI_GPIO)
578 /*
579 * The SPI GPIO bindings happened before we managed to
580 * establish that GPIO properties should be named
581 * "foo-gpios" so we have this special kludge for them.
582 */
583 { "miso", "gpio-miso", "spi-gpio" },
584 { "mosi", "gpio-mosi", "spi-gpio" },
585 { "sck", "gpio-sck", "spi-gpio" },
586 #endif
587
588 /*
589 * The old Freescale bindings use simply "gpios" as name
590 * for the chip select lines rather than "cs-gpios" like
591 * all other SPI hardware. Allow this specifically for
592 * Freescale and PPC devices.
593 */
594 #if IS_ENABLED(CONFIG_SPI_FSL_SPI)
595 { "cs", "gpios", "fsl,spi" },
596 { "cs", "gpios", "aeroflexgaisler,spictrl" },
597 #endif
598 #if IS_ENABLED(CONFIG_SPI_PPC4xx)
599 { "cs", "gpios", "ibm,ppc4xx-spi" },
600 #endif
601
602 #if IS_ENABLED(CONFIG_TYPEC_FUSB302)
603 /*
604 * Fairchild FUSB302 host is using undocumented "fcs,int_n"
605 * property without the compulsory "-gpios" suffix.
606 */
607 { "fcs,int_n", NULL, "fcs,fusb302" },
608 #endif
609 };
610 struct gpio_desc *desc;
611 const char *legacy_id;
612 unsigned int i;
613
614 if (!con_id)
615 return ERR_PTR(-ENOENT);
616
617 for (i = 0; i < ARRAY_SIZE(gpios); i++) {
618 if (strcmp(con_id, gpios[i].con_id))
619 continue;
620
621 if (gpios[i].compatible &&
622 !of_device_is_compatible(np, gpios[i].compatible))
623 continue;
624
625 legacy_id = gpios[i].legacy_id ?: gpios[i].con_id;
626 desc = of_get_named_gpiod_flags(np, legacy_id, idx, of_flags);
627 if (!gpiod_not_found(desc)) {
628 pr_info("%s uses legacy gpio name '%s' instead of '%s-gpios'\n",
629 of_node_full_name(np), legacy_id, con_id);
630 return desc;
631 }
632 }
633
634 return ERR_PTR(-ENOENT);
635 }
636
of_find_mt2701_gpio(struct device_node * np,const char * con_id,unsigned int idx,enum of_gpio_flags * of_flags)637 static struct gpio_desc *of_find_mt2701_gpio(struct device_node *np,
638 const char *con_id,
639 unsigned int idx,
640 enum of_gpio_flags *of_flags)
641 {
642 struct gpio_desc *desc;
643 const char *legacy_id;
644
645 if (!IS_ENABLED(CONFIG_SND_SOC_MT2701_CS42448))
646 return ERR_PTR(-ENOENT);
647
648 if (!of_device_is_compatible(np, "mediatek,mt2701-cs42448-machine"))
649 return ERR_PTR(-ENOENT);
650
651 if (!con_id || strcmp(con_id, "i2s1-in-sel"))
652 return ERR_PTR(-ENOENT);
653
654 if (idx == 0)
655 legacy_id = "i2s1-in-sel-gpio1";
656 else if (idx == 1)
657 legacy_id = "i2s1-in-sel-gpio2";
658 else
659 return ERR_PTR(-ENOENT);
660
661 desc = of_get_named_gpiod_flags(np, legacy_id, 0, of_flags);
662 if (!gpiod_not_found(desc))
663 pr_info("%s is using legacy gpio name '%s' instead of '%s-gpios'\n",
664 of_node_full_name(np), legacy_id, con_id);
665
666 return desc;
667 }
668
669 /*
670 * Trigger sources are special, they allow us to use any GPIO as a LED trigger
671 * and have the name "trigger-sources" no matter which kind of phandle it is
672 * pointing to, whether to a GPIO, a USB host, a network PHY etc. So in this case
673 * we allow looking something up that is not named "foo-gpios".
674 */
of_find_trigger_gpio(struct device_node * np,const char * con_id,unsigned int idx,enum of_gpio_flags * of_flags)675 static struct gpio_desc *of_find_trigger_gpio(struct device_node *np,
676 const char *con_id,
677 unsigned int idx,
678 enum of_gpio_flags *of_flags)
679 {
680 struct gpio_desc *desc;
681
682 if (!IS_ENABLED(CONFIG_LEDS_TRIGGER_GPIO))
683 return ERR_PTR(-ENOENT);
684
685 if (!con_id || strcmp(con_id, "trigger-sources"))
686 return ERR_PTR(-ENOENT);
687
688 desc = of_get_named_gpiod_flags(np, con_id, idx, of_flags);
689 if (!gpiod_not_found(desc))
690 pr_debug("%s is used as a trigger\n", of_node_full_name(np));
691
692 return desc;
693 }
694
695
696 typedef struct gpio_desc *(*of_find_gpio_quirk)(struct device_node *np,
697 const char *con_id,
698 unsigned int idx,
699 enum of_gpio_flags *of_flags);
700 static const of_find_gpio_quirk of_find_gpio_quirks[] = {
701 of_find_gpio_rename,
702 of_find_mt2701_gpio,
703 of_find_trigger_gpio,
704 NULL
705 };
706
of_find_gpio(struct device_node * np,const char * con_id,unsigned int idx,unsigned long * flags)707 struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id,
708 unsigned int idx, unsigned long *flags)
709 {
710 char propname[32]; /* 32 is max size of property name */
711 enum of_gpio_flags of_flags;
712 const of_find_gpio_quirk *q;
713 struct gpio_desc *desc;
714
715 /* Try GPIO property "foo-gpios" and "foo-gpio" */
716 for_each_gpio_property_name(propname, con_id) {
717 desc = of_get_named_gpiod_flags(np, propname, idx, &of_flags);
718 if (!gpiod_not_found(desc))
719 break;
720 }
721
722 /* Properly named GPIO was not found, try workarounds */
723 for (q = of_find_gpio_quirks; gpiod_not_found(desc) && *q; q++)
724 desc = (*q)(np, con_id, idx, &of_flags);
725
726 if (IS_ERR(desc))
727 return desc;
728
729 *flags = of_convert_gpio_flags(of_flags);
730
731 return desc;
732 }
733
734 /**
735 * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API
736 * @np: device node to get GPIO from
737 * @chip: GPIO chip whose hog is parsed
738 * @idx: Index of the GPIO to parse
739 * @name: GPIO line name
740 * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from
741 * of_find_gpio() or of_parse_own_gpio()
742 * @dflags: gpiod_flags - optional GPIO initialization flags
743 *
744 * Returns:
745 * GPIO descriptor to use with Linux GPIO API, or one of the errno
746 * value on the error condition.
747 */
of_parse_own_gpio(struct device_node * np,struct gpio_chip * chip,unsigned int idx,const char ** name,unsigned long * lflags,enum gpiod_flags * dflags)748 static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
749 struct gpio_chip *chip,
750 unsigned int idx, const char **name,
751 unsigned long *lflags,
752 enum gpiod_flags *dflags)
753 {
754 struct device_node *chip_np;
755 enum of_gpio_flags xlate_flags;
756 struct of_phandle_args gpiospec;
757 struct gpio_desc *desc;
758 unsigned int i;
759 u32 tmp;
760 int ret;
761
762 chip_np = dev_of_node(&chip->gpiodev->dev);
763 if (!chip_np)
764 return ERR_PTR(-EINVAL);
765
766 xlate_flags = 0;
767 *lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
768 *dflags = GPIOD_ASIS;
769
770 ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp);
771 if (ret)
772 return ERR_PTR(ret);
773
774 gpiospec.np = chip_np;
775 gpiospec.args_count = tmp;
776
777 for (i = 0; i < tmp; i++) {
778 ret = of_property_read_u32_index(np, "gpios", idx * tmp + i,
779 &gpiospec.args[i]);
780 if (ret)
781 return ERR_PTR(ret);
782 }
783
784 desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags);
785 if (IS_ERR(desc))
786 return desc;
787
788 *lflags = of_convert_gpio_flags(xlate_flags);
789
790 if (of_property_read_bool(np, "input"))
791 *dflags |= GPIOD_IN;
792 else if (of_property_read_bool(np, "output-low"))
793 *dflags |= GPIOD_OUT_LOW;
794 else if (of_property_read_bool(np, "output-high"))
795 *dflags |= GPIOD_OUT_HIGH;
796 else {
797 pr_warn("GPIO line %d (%pOFn): no hogging state specified, bailing out\n",
798 desc_to_gpio(desc), np);
799 return ERR_PTR(-EINVAL);
800 }
801
802 if (name && of_property_read_string(np, "line-name", name))
803 *name = np->name;
804
805 return desc;
806 }
807
808 /**
809 * of_gpiochip_add_hog - Add all hogs in a hog device node
810 * @chip: gpio chip to act on
811 * @hog: device node describing the hogs
812 *
813 * Returns:
814 * 0 on success, or negative errno on failure.
815 */
of_gpiochip_add_hog(struct gpio_chip * chip,struct device_node * hog)816 static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog)
817 {
818 enum gpiod_flags dflags;
819 struct gpio_desc *desc;
820 unsigned long lflags;
821 const char *name;
822 unsigned int i;
823 int ret;
824
825 for (i = 0;; i++) {
826 desc = of_parse_own_gpio(hog, chip, i, &name, &lflags, &dflags);
827 if (IS_ERR(desc))
828 break;
829
830 ret = gpiod_hog(desc, name, lflags, dflags);
831 if (ret < 0)
832 return ret;
833
834 #ifdef CONFIG_OF_DYNAMIC
835 WRITE_ONCE(desc->hog, hog);
836 #endif
837 }
838
839 return 0;
840 }
841
842 /**
843 * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions
844 * @chip: gpio chip to act on
845 *
846 * This is only used by of_gpiochip_add to request/set GPIO initial
847 * configuration.
848 *
849 * Returns:
850 * 0 on success, or negative errno on failure.
851 */
of_gpiochip_scan_gpios(struct gpio_chip * chip)852 static int of_gpiochip_scan_gpios(struct gpio_chip *chip)
853 {
854 int ret;
855
856 for_each_available_child_of_node_scoped(dev_of_node(&chip->gpiodev->dev), np) {
857 if (!of_property_read_bool(np, "gpio-hog"))
858 continue;
859
860 ret = of_gpiochip_add_hog(chip, np);
861 if (ret < 0)
862 return ret;
863
864 of_node_set_flag(np, OF_POPULATED);
865 }
866
867 return 0;
868 }
869
870 #ifdef CONFIG_OF_DYNAMIC
871 /**
872 * of_gpiochip_remove_hog - Remove all hogs in a hog device node
873 * @chip: gpio chip to act on
874 * @hog: device node describing the hogs
875 */
of_gpiochip_remove_hog(struct gpio_chip * chip,struct device_node * hog)876 static void of_gpiochip_remove_hog(struct gpio_chip *chip,
877 struct device_node *hog)
878 {
879 struct gpio_desc *desc;
880
881 for_each_gpio_desc_with_flag(chip, desc, FLAG_IS_HOGGED)
882 if (READ_ONCE(desc->hog) == hog)
883 gpiochip_free_own_desc(desc);
884 }
885
of_gpiochip_match_node(struct gpio_chip * chip,const void * data)886 static int of_gpiochip_match_node(struct gpio_chip *chip, const void *data)
887 {
888 return device_match_of_node(&chip->gpiodev->dev, data);
889 }
890
of_find_gpio_device_by_node(struct device_node * np)891 static struct gpio_device *of_find_gpio_device_by_node(struct device_node *np)
892 {
893 return gpio_device_find(np, of_gpiochip_match_node);
894 }
895
of_gpio_notify(struct notifier_block * nb,unsigned long action,void * arg)896 static int of_gpio_notify(struct notifier_block *nb, unsigned long action,
897 void *arg)
898 {
899 struct gpio_device *gdev __free(gpio_device_put) = NULL;
900 struct of_reconfig_data *rd = arg;
901 int ret;
902
903 /*
904 * This only supports adding and removing complete gpio-hog nodes.
905 * Modifying an existing gpio-hog node is not supported (except for
906 * changing its "status" property, which is treated the same as
907 * addition/removal).
908 */
909 switch (of_reconfig_get_state_change(action, arg)) {
910 case OF_RECONFIG_CHANGE_ADD:
911 if (!of_property_read_bool(rd->dn, "gpio-hog"))
912 return NOTIFY_DONE; /* not for us */
913
914 if (of_node_test_and_set_flag(rd->dn, OF_POPULATED))
915 return NOTIFY_DONE;
916
917 gdev = of_find_gpio_device_by_node(rd->dn->parent);
918 if (!gdev)
919 return NOTIFY_DONE; /* not for us */
920
921 ret = of_gpiochip_add_hog(gpio_device_get_chip(gdev), rd->dn);
922 if (ret < 0) {
923 pr_err("%s: failed to add hogs for %pOF\n", __func__,
924 rd->dn);
925 of_node_clear_flag(rd->dn, OF_POPULATED);
926 return notifier_from_errno(ret);
927 }
928 return NOTIFY_OK;
929
930 case OF_RECONFIG_CHANGE_REMOVE:
931 if (!of_node_check_flag(rd->dn, OF_POPULATED))
932 return NOTIFY_DONE; /* already depopulated */
933
934 gdev = of_find_gpio_device_by_node(rd->dn->parent);
935 if (!gdev)
936 return NOTIFY_DONE; /* not for us */
937
938 of_gpiochip_remove_hog(gpio_device_get_chip(gdev), rd->dn);
939 of_node_clear_flag(rd->dn, OF_POPULATED);
940 return NOTIFY_OK;
941 }
942
943 return NOTIFY_DONE;
944 }
945
946 struct notifier_block gpio_of_notifier = {
947 .notifier_call = of_gpio_notify,
948 };
949 #endif /* CONFIG_OF_DYNAMIC */
950
951 /**
952 * of_gpio_twocell_xlate - translate twocell gpiospec to the GPIO number and flags
953 * @gc: pointer to the gpio_chip structure
954 * @gpiospec: GPIO specifier as found in the device tree
955 * @flags: a flags pointer to fill in
956 *
957 * This is simple translation function, suitable for the most 1:1 mapped
958 * GPIO chips. This function performs only one sanity check: whether GPIO
959 * is less than ngpios (that is specified in the gpio_chip).
960 *
961 * Returns:
962 * GPIO number (>= 0) on success, negative errno on failure.
963 */
of_gpio_twocell_xlate(struct gpio_chip * gc,const struct of_phandle_args * gpiospec,u32 * flags)964 static int of_gpio_twocell_xlate(struct gpio_chip *gc,
965 const struct of_phandle_args *gpiospec,
966 u32 *flags)
967 {
968 /*
969 * We're discouraging gpio_cells < 2, since that way you'll have to
970 * write your own xlate function (that will have to retrieve the GPIO
971 * number and the flags from a single gpio cell -- this is possible,
972 * but not recommended).
973 */
974 if (gc->of_gpio_n_cells != 2) {
975 WARN_ON(1);
976 return -EINVAL;
977 }
978
979 if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
980 return -EINVAL;
981
982 if (gpiospec->args[0] >= gc->ngpio)
983 return -EINVAL;
984
985 if (flags)
986 *flags = gpiospec->args[1];
987
988 return gpiospec->args[0];
989 }
990
991 /**
992 * of_gpio_threecell_xlate - translate threecell gpiospec to the GPIO number and flags
993 * @gc: pointer to the gpio_chip structure
994 * @gpiospec: GPIO specifier as found in the device tree
995 * @flags: a flags pointer to fill in
996 *
997 * This is simple translation function, suitable for the most 1:n mapped
998 * GPIO chips, i.e. several GPIO chip instances from one device tree node.
999 * In this case the following binding is implied:
1000 *
1001 * foo-gpios = <&gpio instance offset flags>;
1002 *
1003 * Returns:
1004 * GPIO number (>= 0) on success, negative errno on failure.
1005 */
of_gpio_threecell_xlate(struct gpio_chip * gc,const struct of_phandle_args * gpiospec,u32 * flags)1006 static int of_gpio_threecell_xlate(struct gpio_chip *gc,
1007 const struct of_phandle_args *gpiospec,
1008 u32 *flags)
1009 {
1010 if (gc->of_gpio_n_cells != 3) {
1011 WARN_ON(1);
1012 return -EINVAL;
1013 }
1014
1015 if (WARN_ON(gpiospec->args_count != 3))
1016 return -EINVAL;
1017
1018 /*
1019 * Check chip instance number, the driver responds with true if
1020 * this is the chip we are looking for.
1021 */
1022 if (!gc->of_node_instance_match(gc, gpiospec->args[0]))
1023 return -EINVAL;
1024
1025 if (gpiospec->args[1] >= gc->ngpio)
1026 return -EINVAL;
1027
1028 if (flags)
1029 *flags = gpiospec->args[2];
1030
1031 return gpiospec->args[1];
1032 }
1033
1034 #if IS_ENABLED(CONFIG_OF_GPIO_MM_GPIOCHIP)
1035 #include <linux/gpio/legacy-of-mm-gpiochip.h>
1036 /**
1037 * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank)
1038 * @np: device node of the GPIO chip
1039 * @mm_gc: pointer to the of_mm_gpio_chip allocated structure
1040 * @data: driver data to store in the struct gpio_chip
1041 *
1042 * To use this function you should allocate and fill mm_gc with:
1043 *
1044 * 1) In the gpio_chip structure:
1045 * - all the callbacks
1046 * - of_gpio_n_cells
1047 * - of_xlate callback (optional)
1048 *
1049 * 3) In the of_mm_gpio_chip structure:
1050 * - save_regs callback (optional)
1051 *
1052 * If succeeded, this function will map bank's memory and will
1053 * do all necessary work for you. Then you'll able to use .regs
1054 * to manage GPIOs from the callbacks.
1055 *
1056 * Returns:
1057 * 0 on success, or negative errno on failure.
1058 */
of_mm_gpiochip_add_data(struct device_node * np,struct of_mm_gpio_chip * mm_gc,void * data)1059 int of_mm_gpiochip_add_data(struct device_node *np,
1060 struct of_mm_gpio_chip *mm_gc,
1061 void *data)
1062 {
1063 int ret = -ENOMEM;
1064 struct gpio_chip *gc = &mm_gc->gc;
1065
1066 gc->label = kasprintf(GFP_KERNEL, "%pOF", np);
1067 if (!gc->label)
1068 goto err0;
1069
1070 mm_gc->regs = of_iomap(np, 0);
1071 if (!mm_gc->regs)
1072 goto err1;
1073
1074 gc->base = -1;
1075
1076 if (mm_gc->save_regs)
1077 mm_gc->save_regs(mm_gc);
1078
1079 fwnode_handle_put(mm_gc->gc.fwnode);
1080 mm_gc->gc.fwnode = fwnode_handle_get(of_fwnode_handle(np));
1081
1082 ret = gpiochip_add_data(gc, data);
1083 if (ret)
1084 goto err2;
1085
1086 return 0;
1087 err2:
1088 of_node_put(np);
1089 iounmap(mm_gc->regs);
1090 err1:
1091 kfree(gc->label);
1092 err0:
1093 pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret);
1094 return ret;
1095 }
1096 EXPORT_SYMBOL_GPL(of_mm_gpiochip_add_data);
1097
1098 /**
1099 * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank)
1100 * @mm_gc: pointer to the of_mm_gpio_chip allocated structure
1101 */
of_mm_gpiochip_remove(struct of_mm_gpio_chip * mm_gc)1102 void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc)
1103 {
1104 struct gpio_chip *gc = &mm_gc->gc;
1105
1106 gpiochip_remove(gc);
1107 iounmap(mm_gc->regs);
1108 kfree(gc->label);
1109 }
1110 EXPORT_SYMBOL_GPL(of_mm_gpiochip_remove);
1111 #endif
1112
1113 #ifdef CONFIG_PINCTRL
of_gpiochip_add_pin_range(struct gpio_chip * chip)1114 static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
1115 {
1116 struct of_phandle_args pinspec;
1117 struct pinctrl_dev *pctldev;
1118 struct device_node *np;
1119 int index = 0, ret, trim;
1120 const char *name;
1121 static const char group_names_propname[] = "gpio-ranges-group-names";
1122 bool has_group_names;
1123 int offset; /* Offset of the first GPIO line on the chip */
1124 int pin; /* Pin base number in the range */
1125 int count; /* Number of pins/GPIO lines to map */
1126
1127 np = dev_of_node(&chip->gpiodev->dev);
1128 if (!np)
1129 return 0;
1130
1131 has_group_names = of_property_present(np, group_names_propname);
1132
1133 for (;; index++) {
1134 /*
1135 * Ordinary phandles contain 2-3 cells:
1136 * gpios = <&gpio [instance] offset flags>;
1137 * Ranges always contain one more cell:
1138 * gpio-ranges <&pinctrl [gpio_instance] gpio_offet pin_offet count>;
1139 * This is why we parse chip->of_gpio_n_cells + 1 cells
1140 */
1141 ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges",
1142 chip->of_gpio_n_cells + 1,
1143 index, &pinspec);
1144 if (ret)
1145 break;
1146
1147 pctldev = of_pinctrl_get(pinspec.np);
1148 of_node_put(pinspec.np);
1149 if (!pctldev)
1150 return -EPROBE_DEFER;
1151
1152 if (chip->of_gpio_n_cells == 3) {
1153 /* First cell is the gpiochip instance number */
1154 offset = pinspec.args[1];
1155 pin = pinspec.args[2];
1156 count = pinspec.args[3];
1157 } else {
1158 offset = pinspec.args[0];
1159 pin = pinspec.args[1];
1160 count = pinspec.args[2];
1161 }
1162
1163 /*
1164 * With multiple GPIO chips per node, check that this chip is the
1165 * right instance.
1166 */
1167 if (chip->of_node_instance_match &&
1168 (chip->of_gpio_n_cells == 3) &&
1169 !chip->of_node_instance_match(chip, pinspec.args[0]))
1170 continue;
1171
1172 /* Ignore ranges outside of this GPIO chip */
1173 if (offset >= (chip->offset + chip->ngpio))
1174 continue;
1175 if (offset + count <= chip->offset)
1176 continue;
1177
1178 if (count) {
1179 /* npins != 0: linear range */
1180 if (has_group_names) {
1181 of_property_read_string_index(np,
1182 group_names_propname,
1183 index, &name);
1184 if (strlen(name)) {
1185 pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n",
1186 np);
1187 break;
1188 }
1189 }
1190
1191 /* Trim the range to fit this GPIO chip */
1192 if (chip->offset > offset) {
1193 trim = chip->offset - offset;
1194 count -= trim;
1195 pin += trim;
1196 offset = 0;
1197 } else {
1198 offset -= chip->offset;
1199 }
1200 if ((offset + count) > chip->ngpio)
1201 count = chip->ngpio - offset;
1202
1203 ret = gpiochip_add_pin_range(chip,
1204 pinctrl_dev_get_devname(pctldev),
1205 offset,
1206 pin,
1207 count);
1208 if (ret)
1209 return ret;
1210 } else {
1211 /* npins == 0: special range */
1212 if (pin) {
1213 pr_err("%pOF: Illegal gpio-range format.\n",
1214 np);
1215 break;
1216 }
1217
1218 if (!has_group_names) {
1219 pr_err("%pOF: GPIO group range requested but no %s property.\n",
1220 np, group_names_propname);
1221 break;
1222 }
1223
1224 ret = of_property_read_string_index(np,
1225 group_names_propname,
1226 index, &name);
1227 if (ret)
1228 break;
1229
1230 if (!strlen(name)) {
1231 pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n",
1232 np);
1233 break;
1234 }
1235
1236 ret = gpiochip_add_pingroup_range(chip, pctldev,
1237 offset, name);
1238 if (ret)
1239 return ret;
1240 }
1241 }
1242
1243 return 0;
1244 }
1245
1246 #else
of_gpiochip_add_pin_range(struct gpio_chip * chip)1247 static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; }
1248 #endif
1249
of_gpiochip_add(struct gpio_chip * chip)1250 int of_gpiochip_add(struct gpio_chip *chip)
1251 {
1252 struct device_node *np;
1253 int ret;
1254
1255 np = dev_of_node(&chip->gpiodev->dev);
1256 if (!np)
1257 return 0;
1258
1259 if (!chip->of_xlate) {
1260 if (chip->of_gpio_n_cells == 3) {
1261 if (!chip->of_node_instance_match)
1262 return -EINVAL;
1263 chip->of_xlate = of_gpio_threecell_xlate;
1264 } else {
1265 chip->of_gpio_n_cells = 2;
1266 chip->of_xlate = of_gpio_twocell_xlate;
1267 }
1268 }
1269
1270 if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS)
1271 return -EINVAL;
1272
1273 ret = of_gpiochip_add_pin_range(chip);
1274 if (ret)
1275 return ret;
1276
1277 of_node_get(np);
1278
1279 ret = of_gpiochip_scan_gpios(chip);
1280 if (ret)
1281 of_node_put(np);
1282
1283 return ret;
1284 }
1285
of_gpiochip_remove(struct gpio_chip * chip)1286 void of_gpiochip_remove(struct gpio_chip *chip)
1287 {
1288 of_node_put(dev_of_node(&chip->gpiodev->dev));
1289 }
1290
of_gpiochip_instance_match(struct gpio_chip * gc,unsigned int index)1291 bool of_gpiochip_instance_match(struct gpio_chip *gc, unsigned int index)
1292 {
1293 if (gc->of_node_instance_match)
1294 return gc->of_node_instance_match(gc, index);
1295
1296 return false;
1297 }
1298