1 // SPDX-License-Identifier: GPL-2.0+
3 * OF helpers for the GPIO API
5 * Copyright (c) 2007-2008 MontaVista Software, Inc.
7 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
10 #include <linux/device.h>
11 #include <linux/err.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
15 #include <linux/gpio/consumer.h>
17 #include <linux/of_address.h>
18 #include <linux/of_gpio.h>
19 #include <linux/pinctrl/pinctrl.h>
20 #include <linux/slab.h>
21 #include <linux/gpio/machine.h>
24 #include "gpiolib-of.h"
27 * of_gpio_spi_cs_get_count() - special GPIO counting for SPI
28 * Some elder GPIO controllers need special quirks. Currently we handle
29 * the Freescale GPIO controller with bindings that doesn't use the
30 * established "cs-gpios" for chip selects but instead rely on
31 * "gpios" for the chip select lines. If we detect this, we redirect
32 * the counting of "cs-gpios" to count "gpios" transparent to the
35 static int of_gpio_spi_cs_get_count(struct device *dev, const char *con_id)
37 struct device_node *np = dev->of_node;
39 if (!IS_ENABLED(CONFIG_SPI_MASTER))
41 if (!con_id || strcmp(con_id, "cs"))
43 if (!of_device_is_compatible(np, "fsl,spi") &&
44 !of_device_is_compatible(np, "aeroflexgaisler,spictrl"))
46 return of_gpio_named_count(np, "gpios");
50 * This is used by external users of of_gpio_count() from <linux/of_gpio.h>
52 * FIXME: get rid of those external users by converting them to GPIO
53 * descriptors and let them all use gpiod_get_count()
55 int of_gpio_get_count(struct device *dev, const char *con_id)
61 ret = of_gpio_spi_cs_get_count(dev, con_id);
65 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
67 snprintf(propname, sizeof(propname), "%s-%s",
68 con_id, gpio_suffixes[i]);
70 snprintf(propname, sizeof(propname), "%s",
73 ret = of_gpio_named_count(dev->of_node, propname);
77 return ret ? ret : -ENOENT;
80 static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data)
82 struct of_phandle_args *gpiospec = data;
84 return chip->gpiodev->dev.of_node == gpiospec->np &&
86 chip->of_xlate(chip, gpiospec, NULL) >= 0;
89 static struct gpio_chip *of_find_gpiochip_by_xlate(
90 struct of_phandle_args *gpiospec)
92 return gpiochip_find(gpiospec, of_gpiochip_match_node_and_xlate);
95 static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip,
96 struct of_phandle_args *gpiospec,
97 enum of_gpio_flags *flags)
101 if (chip->of_gpio_n_cells != gpiospec->args_count)
102 return ERR_PTR(-EINVAL);
104 ret = chip->of_xlate(chip, gpiospec, flags);
108 return gpiochip_get_desc(chip, ret);
112 * of_gpio_need_valid_mask() - figure out if the OF GPIO driver needs
113 * to set the .valid_mask
114 * @dev: the device for the GPIO provider
115 * @return: true if the valid mask needs to be set
117 bool of_gpio_need_valid_mask(const struct gpio_chip *gc)
120 struct device_node *np = gc->of_node;
122 size = of_property_count_u32_elems(np, "gpio-reserved-ranges");
123 if (size > 0 && size % 2 == 0)
128 static void of_gpio_flags_quirks(struct device_node *np,
129 const char *propname,
130 enum of_gpio_flags *flags,
134 * Handle MMC "cd-inverted" and "wp-inverted" semantics.
136 if (IS_ENABLED(CONFIG_MMC)) {
138 * Active low is the default according to the
139 * SDHCI specification and the device tree
140 * bindings. However the code in the current
141 * kernel was written such that the phandle
142 * flags were always respected, and "cd-inverted"
143 * would invert the flag from the device phandle.
145 if (!strcmp(propname, "cd-gpios")) {
146 if (of_property_read_bool(np, "cd-inverted"))
147 *flags ^= OF_GPIO_ACTIVE_LOW;
149 if (!strcmp(propname, "wp-gpios")) {
150 if (of_property_read_bool(np, "wp-inverted"))
151 *flags ^= OF_GPIO_ACTIVE_LOW;
155 * Some GPIO fixed regulator quirks.
156 * Note that active low is the default.
158 if (IS_ENABLED(CONFIG_REGULATOR) &&
159 (of_device_is_compatible(np, "regulator-fixed") ||
160 of_device_is_compatible(np, "reg-fixed-voltage") ||
161 (!(strcmp(propname, "enable-gpio") &&
162 strcmp(propname, "enable-gpios")) &&
163 of_device_is_compatible(np, "regulator-gpio")))) {
165 * The regulator GPIO handles are specified such that the
166 * presence or absence of "enable-active-high" solely controls
167 * the polarity of the GPIO line. Any phandle flags must
168 * be actively ignored.
170 if (*flags & OF_GPIO_ACTIVE_LOW) {
171 pr_warn("%s GPIO handle specifies active low - ignored\n",
172 of_node_full_name(np));
173 *flags &= ~OF_GPIO_ACTIVE_LOW;
175 if (!of_property_read_bool(np, "enable-active-high"))
176 *flags |= OF_GPIO_ACTIVE_LOW;
179 * Legacy open drain handling for fixed voltage regulators.
181 if (IS_ENABLED(CONFIG_REGULATOR) &&
182 of_device_is_compatible(np, "reg-fixed-voltage") &&
183 of_property_read_bool(np, "gpio-open-drain")) {
184 *flags |= (OF_GPIO_SINGLE_ENDED | OF_GPIO_OPEN_DRAIN);
185 pr_info("%s uses legacy open drain flag - update the DTS if you can\n",
186 of_node_full_name(np));
190 * Legacy handling of SPI active high chip select. If we have a
191 * property named "cs-gpios" we need to inspect the child node
192 * to determine if the flags should have inverted semantics.
194 if (IS_ENABLED(CONFIG_SPI_MASTER) && !strcmp(propname, "cs-gpios") &&
195 of_property_read_bool(np, "cs-gpios")) {
196 struct device_node *child;
200 for_each_child_of_node(np, child) {
201 ret = of_property_read_u32(child, "reg", &cs);
206 * SPI children have active low chip selects
207 * by default. This can be specified negatively
208 * by just omitting "spi-cs-high" in the
209 * device node, or actively by tagging on
210 * GPIO_ACTIVE_LOW as flag in the device
211 * tree. If the line is simultaneously
212 * tagged as active low in the device tree
213 * and has the "spi-cs-high" set, we get a
214 * conflict and the "spi-cs-high" flag will
217 if (of_property_read_bool(child, "spi-cs-high")) {
218 if (*flags & OF_GPIO_ACTIVE_LOW) {
219 pr_warn("%s GPIO handle specifies active low - ignored\n",
220 of_node_full_name(child));
221 *flags &= ~OF_GPIO_ACTIVE_LOW;
224 if (!(*flags & OF_GPIO_ACTIVE_LOW))
225 pr_info("%s enforce active low on chipselect handle\n",
226 of_node_full_name(child));
227 *flags |= OF_GPIO_ACTIVE_LOW;
235 /* Legacy handling of stmmac's active-low PHY reset line */
236 if (IS_ENABLED(CONFIG_STMMAC_ETH) &&
237 !strcmp(propname, "snps,reset-gpio") &&
238 of_property_read_bool(np, "snps,reset-active-low"))
239 *flags |= OF_GPIO_ACTIVE_LOW;
243 * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
244 * @np: device node to get GPIO from
245 * @propname: property name containing gpio specifier(s)
246 * @index: index of the GPIO
247 * @flags: a flags pointer to fill in
249 * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
250 * value on the error condition. If @flags is not NULL the function also fills
251 * in flags for the GPIO.
253 static struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
254 const char *propname, int index, enum of_gpio_flags *flags)
256 struct of_phandle_args gpiospec;
257 struct gpio_chip *chip;
258 struct gpio_desc *desc;
261 ret = of_parse_phandle_with_args_map(np, propname, "gpio", index,
264 pr_debug("%s: can't parse '%s' property of node '%pOF[%d]'\n",
265 __func__, propname, np, index);
269 chip = of_find_gpiochip_by_xlate(&gpiospec);
271 desc = ERR_PTR(-EPROBE_DEFER);
275 desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, flags);
280 of_gpio_flags_quirks(np, propname, flags, index);
282 pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n",
283 __func__, propname, np, index,
284 PTR_ERR_OR_ZERO(desc));
287 of_node_put(gpiospec.np);
292 int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
293 int index, enum of_gpio_flags *flags)
295 struct gpio_desc *desc;
297 desc = of_get_named_gpiod_flags(np, list_name, index, flags);
300 return PTR_ERR(desc);
302 return desc_to_gpio(desc);
304 EXPORT_SYMBOL_GPL(of_get_named_gpio_flags);
307 * gpiod_get_from_of_node() - obtain a GPIO from an OF node
308 * @node: handle of the OF node
309 * @propname: name of the DT property representing the GPIO
310 * @index: index of the GPIO to obtain for the consumer
311 * @dflags: GPIO initialization flags
312 * @label: label to attach to the requested GPIO
315 * On successful request the GPIO pin is configured in accordance with
318 * In case of error an ERR_PTR() is returned.
320 struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
321 const char *propname, int index,
322 enum gpiod_flags dflags,
325 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
326 struct gpio_desc *desc;
327 enum of_gpio_flags flags;
328 bool active_low = false;
329 bool single_ended = false;
330 bool open_drain = false;
331 bool transitory = false;
334 desc = of_get_named_gpiod_flags(node, propname,
337 if (!desc || IS_ERR(desc)) {
341 active_low = flags & OF_GPIO_ACTIVE_LOW;
342 single_ended = flags & OF_GPIO_SINGLE_ENDED;
343 open_drain = flags & OF_GPIO_OPEN_DRAIN;
344 transitory = flags & OF_GPIO_TRANSITORY;
346 ret = gpiod_request(desc, label);
347 if (ret == -EBUSY && (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE))
353 lflags |= GPIO_ACTIVE_LOW;
357 lflags |= GPIO_OPEN_DRAIN;
359 lflags |= GPIO_OPEN_SOURCE;
363 lflags |= GPIO_TRANSITORY;
365 ret = gpiod_configure_flags(desc, propname, lflags, dflags);
373 EXPORT_SYMBOL_GPL(gpiod_get_from_of_node);
376 * The SPI GPIO bindings happened before we managed to establish that GPIO
377 * properties should be named "foo-gpios" so we have this special kludge for
380 static struct gpio_desc *of_find_spi_gpio(struct device *dev, const char *con_id,
381 enum of_gpio_flags *of_flags)
383 char prop_name[32]; /* 32 is max size of property name */
384 struct device_node *np = dev->of_node;
385 struct gpio_desc *desc;
388 * Hopefully the compiler stubs the rest of the function if this
391 if (!IS_ENABLED(CONFIG_SPI_MASTER))
392 return ERR_PTR(-ENOENT);
394 /* Allow this specifically for "spi-gpio" devices */
395 if (!of_device_is_compatible(np, "spi-gpio") || !con_id)
396 return ERR_PTR(-ENOENT);
398 /* Will be "gpio-sck", "gpio-mosi" or "gpio-miso" */
399 snprintf(prop_name, sizeof(prop_name), "%s-%s", "gpio", con_id);
401 desc = of_get_named_gpiod_flags(np, prop_name, 0, of_flags);
406 * The old Freescale bindings use simply "gpios" as name for the chip select
407 * lines rather than "cs-gpios" like all other SPI hardware. Account for this
408 * with a special quirk.
410 static struct gpio_desc *of_find_spi_cs_gpio(struct device *dev,
413 unsigned long *flags)
415 struct device_node *np = dev->of_node;
417 if (!IS_ENABLED(CONFIG_SPI_MASTER))
418 return ERR_PTR(-ENOENT);
420 /* Allow this specifically for Freescale devices */
421 if (!of_device_is_compatible(np, "fsl,spi") &&
422 !of_device_is_compatible(np, "aeroflexgaisler,spictrl"))
423 return ERR_PTR(-ENOENT);
424 /* Allow only if asking for "cs-gpios" */
425 if (!con_id || strcmp(con_id, "cs"))
426 return ERR_PTR(-ENOENT);
429 * While all other SPI controllers use "cs-gpios" the Freescale
430 * uses just "gpios" so translate to that when "cs-gpios" is
433 return of_find_gpio(dev, NULL, idx, flags);
437 * Some regulator bindings happened before we managed to establish that GPIO
438 * properties should be named "foo-gpios" so we have this special kludge for
441 static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *con_id,
442 enum of_gpio_flags *of_flags)
444 /* These are the connection IDs we accept as legacy GPIO phandles */
445 const char *whitelist[] = {
446 "wlf,ldoena", /* Arizona */
447 "wlf,ldo1ena", /* WM8994 */
448 "wlf,ldo2ena", /* WM8994 */
450 struct device_node *np = dev->of_node;
451 struct gpio_desc *desc;
454 if (!IS_ENABLED(CONFIG_REGULATOR))
455 return ERR_PTR(-ENOENT);
458 return ERR_PTR(-ENOENT);
460 i = match_string(whitelist, ARRAY_SIZE(whitelist), con_id);
462 return ERR_PTR(-ENOENT);
464 desc = of_get_named_gpiod_flags(np, con_id, 0, of_flags);
468 static struct gpio_desc *of_find_arizona_gpio(struct device *dev,
470 enum of_gpio_flags *of_flags)
472 if (!IS_ENABLED(CONFIG_MFD_ARIZONA))
473 return ERR_PTR(-ENOENT);
475 if (!con_id || strcmp(con_id, "wlf,reset"))
476 return ERR_PTR(-ENOENT);
478 return of_get_named_gpiod_flags(dev->of_node, con_id, 0, of_flags);
481 struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
482 unsigned int idx, unsigned long *flags)
484 char prop_name[32]; /* 32 is max size of property name */
485 enum of_gpio_flags of_flags;
486 struct gpio_desc *desc;
489 /* Try GPIO property "foo-gpios" and "foo-gpio" */
490 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
492 snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id,
495 snprintf(prop_name, sizeof(prop_name), "%s",
498 desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx,
501 if (!IS_ERR(desc) || PTR_ERR(desc) != -ENOENT)
505 if (IS_ERR(desc) && PTR_ERR(desc) == -ENOENT) {
506 /* Special handling for SPI GPIOs if used */
507 desc = of_find_spi_gpio(dev, con_id, &of_flags);
510 if (IS_ERR(desc) && PTR_ERR(desc) == -ENOENT) {
511 /* This quirk looks up flags and all */
512 desc = of_find_spi_cs_gpio(dev, con_id, idx, flags);
517 if (IS_ERR(desc) && PTR_ERR(desc) == -ENOENT) {
518 /* Special handling for regulator GPIOs if used */
519 desc = of_find_regulator_gpio(dev, con_id, &of_flags);
522 if (IS_ERR(desc) && PTR_ERR(desc) == -ENOENT)
523 desc = of_find_arizona_gpio(dev, con_id, &of_flags);
528 if (of_flags & OF_GPIO_ACTIVE_LOW)
529 *flags |= GPIO_ACTIVE_LOW;
531 if (of_flags & OF_GPIO_SINGLE_ENDED) {
532 if (of_flags & OF_GPIO_OPEN_DRAIN)
533 *flags |= GPIO_OPEN_DRAIN;
535 *flags |= GPIO_OPEN_SOURCE;
538 if (of_flags & OF_GPIO_TRANSITORY)
539 *flags |= GPIO_TRANSITORY;
541 if (of_flags & OF_GPIO_PULL_UP)
542 *flags |= GPIO_PULL_UP;
543 if (of_flags & OF_GPIO_PULL_DOWN)
544 *flags |= GPIO_PULL_DOWN;
550 * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API
551 * @np: device node to get GPIO from
552 * @chip: GPIO chip whose hog is parsed
553 * @idx: Index of the GPIO to parse
554 * @name: GPIO line name
555 * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from
556 * of_find_gpio() or of_parse_own_gpio()
557 * @dflags: gpiod_flags - optional GPIO initialization flags
559 * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
560 * value on the error condition.
562 static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
563 struct gpio_chip *chip,
564 unsigned int idx, const char **name,
565 unsigned long *lflags,
566 enum gpiod_flags *dflags)
568 struct device_node *chip_np;
569 enum of_gpio_flags xlate_flags;
570 struct of_phandle_args gpiospec;
571 struct gpio_desc *desc;
576 chip_np = chip->of_node;
578 return ERR_PTR(-EINVAL);
581 *lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
584 ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp);
588 gpiospec.np = chip_np;
589 gpiospec.args_count = tmp;
591 for (i = 0; i < tmp; i++) {
592 ret = of_property_read_u32_index(np, "gpios", idx * tmp + i,
598 desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags);
602 if (xlate_flags & OF_GPIO_ACTIVE_LOW)
603 *lflags |= GPIO_ACTIVE_LOW;
604 if (xlate_flags & OF_GPIO_TRANSITORY)
605 *lflags |= GPIO_TRANSITORY;
607 if (of_property_read_bool(np, "input"))
609 else if (of_property_read_bool(np, "output-low"))
610 *dflags |= GPIOD_OUT_LOW;
611 else if (of_property_read_bool(np, "output-high"))
612 *dflags |= GPIOD_OUT_HIGH;
614 pr_warn("GPIO line %d (%pOFn): no hogging state specified, bailing out\n",
615 desc_to_gpio(desc), np);
616 return ERR_PTR(-EINVAL);
619 if (name && of_property_read_string(np, "line-name", name))
626 * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions
627 * @chip: gpio chip to act on
629 * This is only used by of_gpiochip_add to request/set GPIO initial
631 * It returns error if it fails otherwise 0 on success.
633 static int of_gpiochip_scan_gpios(struct gpio_chip *chip)
635 struct gpio_desc *desc = NULL;
636 struct device_node *np;
638 unsigned long lflags;
639 enum gpiod_flags dflags;
643 for_each_available_child_of_node(chip->of_node, np) {
644 if (!of_property_read_bool(np, "gpio-hog"))
648 desc = of_parse_own_gpio(np, chip, i, &name, &lflags,
653 ret = gpiod_hog(desc, name, lflags, dflags);
665 * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags
666 * @gc: pointer to the gpio_chip structure
667 * @gpiospec: GPIO specifier as found in the device tree
668 * @flags: a flags pointer to fill in
670 * This is simple translation function, suitable for the most 1:1 mapped
671 * GPIO chips. This function performs only one sanity check: whether GPIO
672 * is less than ngpios (that is specified in the gpio_chip).
674 static int of_gpio_simple_xlate(struct gpio_chip *gc,
675 const struct of_phandle_args *gpiospec,
679 * We're discouraging gpio_cells < 2, since that way you'll have to
680 * write your own xlate function (that will have to retrieve the GPIO
681 * number and the flags from a single gpio cell -- this is possible,
682 * but not recommended).
684 if (gc->of_gpio_n_cells < 2) {
689 if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
692 if (gpiospec->args[0] >= gc->ngpio)
696 *flags = gpiospec->args[1];
698 return gpiospec->args[0];
702 * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank)
703 * @np: device node of the GPIO chip
704 * @mm_gc: pointer to the of_mm_gpio_chip allocated structure
705 * @data: driver data to store in the struct gpio_chip
707 * To use this function you should allocate and fill mm_gc with:
709 * 1) In the gpio_chip structure:
710 * - all the callbacks
712 * - of_xlate callback (optional)
714 * 3) In the of_mm_gpio_chip structure:
715 * - save_regs callback (optional)
717 * If succeeded, this function will map bank's memory and will
718 * do all necessary work for you. Then you'll able to use .regs
719 * to manage GPIOs from the callbacks.
721 int of_mm_gpiochip_add_data(struct device_node *np,
722 struct of_mm_gpio_chip *mm_gc,
726 struct gpio_chip *gc = &mm_gc->gc;
728 gc->label = kasprintf(GFP_KERNEL, "%pOF", np);
732 mm_gc->regs = of_iomap(np, 0);
738 if (mm_gc->save_regs)
739 mm_gc->save_regs(mm_gc);
741 mm_gc->gc.of_node = np;
743 ret = gpiochip_add_data(gc, data);
749 iounmap(mm_gc->regs);
753 pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret);
756 EXPORT_SYMBOL_GPL(of_mm_gpiochip_add_data);
759 * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank)
760 * @mm_gc: pointer to the of_mm_gpio_chip allocated structure
762 void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc)
764 struct gpio_chip *gc = &mm_gc->gc;
770 iounmap(mm_gc->regs);
773 EXPORT_SYMBOL_GPL(of_mm_gpiochip_remove);
775 static void of_gpiochip_init_valid_mask(struct gpio_chip *chip)
779 struct device_node *np = chip->of_node;
781 len = of_property_count_u32_elems(np, "gpio-reserved-ranges");
782 if (len < 0 || len % 2 != 0)
785 for (i = 0; i < len; i += 2) {
786 of_property_read_u32_index(np, "gpio-reserved-ranges",
788 of_property_read_u32_index(np, "gpio-reserved-ranges",
790 if (start >= chip->ngpio || start + count >= chip->ngpio)
793 bitmap_clear(chip->valid_mask, start, count);
797 #ifdef CONFIG_PINCTRL
798 static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
800 struct device_node *np = chip->of_node;
801 struct of_phandle_args pinspec;
802 struct pinctrl_dev *pctldev;
805 static const char group_names_propname[] = "gpio-ranges-group-names";
806 struct property *group_names;
811 group_names = of_find_property(np, group_names_propname, NULL);
814 ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
819 pctldev = of_pinctrl_get(pinspec.np);
820 of_node_put(pinspec.np);
822 return -EPROBE_DEFER;
824 if (pinspec.args[2]) {
826 of_property_read_string_index(np,
827 group_names_propname,
830 pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n",
835 /* npins != 0: linear range */
836 ret = gpiochip_add_pin_range(chip,
837 pinctrl_dev_get_devname(pctldev),
844 /* npins == 0: special range */
845 if (pinspec.args[1]) {
846 pr_err("%pOF: Illegal gpio-range format.\n",
852 pr_err("%pOF: GPIO group range requested but no %s property.\n",
853 np, group_names_propname);
857 ret = of_property_read_string_index(np,
858 group_names_propname,
864 pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n",
869 ret = gpiochip_add_pingroup_range(chip, pctldev,
870 pinspec.args[0], name);
880 static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; }
883 int of_gpiochip_add(struct gpio_chip *chip)
890 if (!chip->of_xlate) {
891 chip->of_gpio_n_cells = 2;
892 chip->of_xlate = of_gpio_simple_xlate;
895 if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS)
898 of_gpiochip_init_valid_mask(chip);
900 ret = of_gpiochip_add_pin_range(chip);
904 /* If the chip defines names itself, these take precedence */
906 devprop_gpiochip_set_names(chip,
907 of_fwnode_handle(chip->of_node));
909 of_node_get(chip->of_node);
911 ret = of_gpiochip_scan_gpios(chip);
913 of_node_put(chip->of_node);
914 gpiochip_remove_pin_ranges(chip);
920 void of_gpiochip_remove(struct gpio_chip *chip)
922 gpiochip_remove_pin_ranges(chip);
923 of_node_put(chip->of_node);