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 * This is used by external users of of_gpio_count() from <linux/of_gpio.h>
29 * FIXME: get rid of those external users by converting them to GPIO
30 * descriptors and let them all use gpiod_get_count()
32 int of_gpio_get_count(struct device *dev, const char *con_id)
38 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
40 snprintf(propname, sizeof(propname), "%s-%s",
41 con_id, gpio_suffixes[i]);
43 snprintf(propname, sizeof(propname), "%s",
46 ret = of_gpio_named_count(dev->of_node, propname);
50 return ret ? ret : -ENOENT;
53 static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data)
55 struct of_phandle_args *gpiospec = data;
57 return chip->gpiodev->dev.of_node == gpiospec->np &&
59 chip->of_xlate(chip, gpiospec, NULL) >= 0;
62 static struct gpio_chip *of_find_gpiochip_by_xlate(
63 struct of_phandle_args *gpiospec)
65 return gpiochip_find(gpiospec, of_gpiochip_match_node_and_xlate);
68 static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip,
69 struct of_phandle_args *gpiospec,
70 enum of_gpio_flags *flags)
74 if (chip->of_gpio_n_cells != gpiospec->args_count)
75 return ERR_PTR(-EINVAL);
77 ret = chip->of_xlate(chip, gpiospec, flags);
81 return gpiochip_get_desc(chip, ret);
85 * of_gpio_need_valid_mask() - figure out if the OF GPIO driver needs
86 * to set the .valid_mask
87 * @dev: the device for the GPIO provider
88 * @return: true if the valid mask needs to be set
90 bool of_gpio_need_valid_mask(const struct gpio_chip *gc)
93 struct device_node *np = gc->of_node;
95 size = of_property_count_u32_elems(np, "gpio-reserved-ranges");
96 if (size > 0 && size % 2 == 0)
101 static void of_gpio_flags_quirks(struct device_node *np,
102 const char *propname,
103 enum of_gpio_flags *flags,
107 * Handle MMC "cd-inverted" and "wp-inverted" semantics.
109 if (IS_ENABLED(CONFIG_MMC)) {
111 * Active low is the default according to the
112 * SDHCI specification and the device tree
113 * bindings. However the code in the current
114 * kernel was written such that the phandle
115 * flags were always respected, and "cd-inverted"
116 * would invert the flag from the device phandle.
118 if (!strcmp(propname, "cd-gpios")) {
119 if (of_property_read_bool(np, "cd-inverted"))
120 *flags ^= OF_GPIO_ACTIVE_LOW;
122 if (!strcmp(propname, "wp-gpios")) {
123 if (of_property_read_bool(np, "wp-inverted"))
124 *flags ^= OF_GPIO_ACTIVE_LOW;
128 * Some GPIO fixed regulator quirks.
129 * Note that active low is the default.
131 if (IS_ENABLED(CONFIG_REGULATOR) &&
132 (of_device_is_compatible(np, "regulator-fixed") ||
133 of_device_is_compatible(np, "reg-fixed-voltage") ||
134 (!(strcmp(propname, "enable-gpio") &&
135 strcmp(propname, "enable-gpios")) &&
136 of_device_is_compatible(np, "regulator-gpio")))) {
138 * The regulator GPIO handles are specified such that the
139 * presence or absence of "enable-active-high" solely controls
140 * the polarity of the GPIO line. Any phandle flags must
141 * be actively ignored.
143 if (*flags & OF_GPIO_ACTIVE_LOW) {
144 pr_warn("%s GPIO handle specifies active low - ignored\n",
145 of_node_full_name(np));
146 *flags &= ~OF_GPIO_ACTIVE_LOW;
148 if (!of_property_read_bool(np, "enable-active-high"))
149 *flags |= OF_GPIO_ACTIVE_LOW;
152 * Legacy open drain handling for fixed voltage regulators.
154 if (IS_ENABLED(CONFIG_REGULATOR) &&
155 of_device_is_compatible(np, "reg-fixed-voltage") &&
156 of_property_read_bool(np, "gpio-open-drain")) {
157 *flags |= (OF_GPIO_SINGLE_ENDED | OF_GPIO_OPEN_DRAIN);
158 pr_info("%s uses legacy open drain flag - update the DTS if you can\n",
159 of_node_full_name(np));
163 * Legacy handling of SPI active high chip select. If we have a
164 * property named "cs-gpios" we need to inspect the child node
165 * to determine if the flags should have inverted semantics.
167 if (IS_ENABLED(CONFIG_SPI_MASTER) && !strcmp(propname, "cs-gpios") &&
168 of_property_read_bool(np, "cs-gpios")) {
169 struct device_node *child;
173 for_each_child_of_node(np, child) {
174 ret = of_property_read_u32(child, "reg", &cs);
179 * SPI children have active low chip selects
180 * by default. This can be specified negatively
181 * by just omitting "spi-cs-high" in the
182 * device node, or actively by tagging on
183 * GPIO_ACTIVE_LOW as flag in the device
184 * tree. If the line is simultaneously
185 * tagged as active low in the device tree
186 * and has the "spi-cs-high" set, we get a
187 * conflict and the "spi-cs-high" flag will
190 if (of_property_read_bool(child, "spi-cs-high")) {
191 if (*flags & OF_GPIO_ACTIVE_LOW) {
192 pr_warn("%s GPIO handle specifies active low - ignored\n",
193 of_node_full_name(child));
194 *flags &= ~OF_GPIO_ACTIVE_LOW;
197 if (!(*flags & OF_GPIO_ACTIVE_LOW))
198 pr_info("%s enforce active low on chipselect handle\n",
199 of_node_full_name(child));
200 *flags |= OF_GPIO_ACTIVE_LOW;
208 /* Legacy handling of stmmac's active-low PHY reset line */
209 if (IS_ENABLED(CONFIG_STMMAC_ETH) &&
210 !strcmp(propname, "snps,reset-gpio") &&
211 of_property_read_bool(np, "snps,reset-active-low"))
212 *flags |= OF_GPIO_ACTIVE_LOW;
216 * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
217 * @np: device node to get GPIO from
218 * @propname: property name containing gpio specifier(s)
219 * @index: index of the GPIO
220 * @flags: a flags pointer to fill in
222 * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
223 * value on the error condition. If @flags is not NULL the function also fills
224 * in flags for the GPIO.
226 static struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
227 const char *propname, int index, enum of_gpio_flags *flags)
229 struct of_phandle_args gpiospec;
230 struct gpio_chip *chip;
231 struct gpio_desc *desc;
234 ret = of_parse_phandle_with_args_map(np, propname, "gpio", index,
237 pr_debug("%s: can't parse '%s' property of node '%pOF[%d]'\n",
238 __func__, propname, np, index);
242 chip = of_find_gpiochip_by_xlate(&gpiospec);
244 desc = ERR_PTR(-EPROBE_DEFER);
248 desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, flags);
253 of_gpio_flags_quirks(np, propname, flags, index);
255 pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n",
256 __func__, propname, np, index,
257 PTR_ERR_OR_ZERO(desc));
260 of_node_put(gpiospec.np);
265 int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
266 int index, enum of_gpio_flags *flags)
268 struct gpio_desc *desc;
270 desc = of_get_named_gpiod_flags(np, list_name, index, flags);
273 return PTR_ERR(desc);
275 return desc_to_gpio(desc);
277 EXPORT_SYMBOL_GPL(of_get_named_gpio_flags);
280 * gpiod_get_from_of_node() - obtain a GPIO from an OF node
281 * @node: handle of the OF node
282 * @propname: name of the DT property representing the GPIO
283 * @index: index of the GPIO to obtain for the consumer
284 * @dflags: GPIO initialization flags
285 * @label: label to attach to the requested GPIO
288 * On successful request the GPIO pin is configured in accordance with
291 * In case of error an ERR_PTR() is returned.
293 struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
294 const char *propname, int index,
295 enum gpiod_flags dflags,
298 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
299 struct gpio_desc *desc;
300 enum of_gpio_flags flags;
301 bool active_low = false;
302 bool single_ended = false;
303 bool open_drain = false;
304 bool transitory = false;
307 desc = of_get_named_gpiod_flags(node, propname,
310 if (!desc || IS_ERR(desc)) {
314 active_low = flags & OF_GPIO_ACTIVE_LOW;
315 single_ended = flags & OF_GPIO_SINGLE_ENDED;
316 open_drain = flags & OF_GPIO_OPEN_DRAIN;
317 transitory = flags & OF_GPIO_TRANSITORY;
319 ret = gpiod_request(desc, label);
320 if (ret == -EBUSY && (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE))
326 lflags |= GPIO_ACTIVE_LOW;
330 lflags |= GPIO_OPEN_DRAIN;
332 lflags |= GPIO_OPEN_SOURCE;
336 lflags |= GPIO_TRANSITORY;
338 ret = gpiod_configure_flags(desc, propname, lflags, dflags);
346 EXPORT_SYMBOL_GPL(gpiod_get_from_of_node);
349 * The SPI GPIO bindings happened before we managed to establish that GPIO
350 * properties should be named "foo-gpios" so we have this special kludge for
353 static struct gpio_desc *of_find_spi_gpio(struct device *dev, const char *con_id,
354 enum of_gpio_flags *of_flags)
356 char prop_name[32]; /* 32 is max size of property name */
357 struct device_node *np = dev->of_node;
358 struct gpio_desc *desc;
361 * Hopefully the compiler stubs the rest of the function if this
364 if (!IS_ENABLED(CONFIG_SPI_MASTER))
365 return ERR_PTR(-ENOENT);
367 /* Allow this specifically for "spi-gpio" devices */
368 if (!of_device_is_compatible(np, "spi-gpio") || !con_id)
369 return ERR_PTR(-ENOENT);
371 /* Will be "gpio-sck", "gpio-mosi" or "gpio-miso" */
372 snprintf(prop_name, sizeof(prop_name), "%s-%s", "gpio", con_id);
374 desc = of_get_named_gpiod_flags(np, prop_name, 0, of_flags);
379 * The old Freescale bindings use simply "gpios" as name for the chip select
380 * lines rather than "cs-gpios" like all other SPI hardware. Account for this
381 * with a special quirk.
383 static struct gpio_desc *of_find_spi_cs_gpio(struct device *dev,
386 unsigned long *flags)
388 struct device_node *np = dev->of_node;
390 if (!IS_ENABLED(CONFIG_SPI_MASTER))
391 return ERR_PTR(-ENOENT);
393 /* Allow this specifically for Freescale devices */
394 if (!of_device_is_compatible(np, "fsl,spi") &&
395 !of_device_is_compatible(np, "aeroflexgaisler,spictrl"))
396 return ERR_PTR(-ENOENT);
397 /* Allow only if asking for "cs-gpios" */
398 if (!con_id || strcmp(con_id, "cs"))
399 return ERR_PTR(-ENOENT);
402 * While all other SPI controllers use "cs-gpios" the Freescale
403 * uses just "gpios" so translate to that when "cs-gpios" is
406 return of_find_gpio(dev, NULL, idx, flags);
410 * Some regulator bindings happened before we managed to establish that GPIO
411 * properties should be named "foo-gpios" so we have this special kludge for
414 static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *con_id,
415 enum of_gpio_flags *of_flags)
417 /* These are the connection IDs we accept as legacy GPIO phandles */
418 const char *whitelist[] = {
419 "wlf,ldoena", /* Arizona */
420 "wlf,ldo1ena", /* WM8994 */
421 "wlf,ldo2ena", /* WM8994 */
423 struct device_node *np = dev->of_node;
424 struct gpio_desc *desc;
427 if (!IS_ENABLED(CONFIG_REGULATOR))
428 return ERR_PTR(-ENOENT);
431 return ERR_PTR(-ENOENT);
433 i = match_string(whitelist, ARRAY_SIZE(whitelist), con_id);
435 return ERR_PTR(-ENOENT);
437 desc = of_get_named_gpiod_flags(np, con_id, 0, of_flags);
441 static struct gpio_desc *of_find_arizona_gpio(struct device *dev,
443 enum of_gpio_flags *of_flags)
445 if (!IS_ENABLED(CONFIG_MFD_ARIZONA))
446 return ERR_PTR(-ENOENT);
448 if (!con_id || strcmp(con_id, "wlf,reset"))
449 return ERR_PTR(-ENOENT);
451 return of_get_named_gpiod_flags(dev->of_node, con_id, 0, of_flags);
454 struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
455 unsigned int idx, unsigned long *flags)
457 char prop_name[32]; /* 32 is max size of property name */
458 enum of_gpio_flags of_flags;
459 struct gpio_desc *desc;
462 /* Try GPIO property "foo-gpios" and "foo-gpio" */
463 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
465 snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id,
468 snprintf(prop_name, sizeof(prop_name), "%s",
471 desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx,
474 * -EPROBE_DEFER in our case means that we found a
475 * valid GPIO property, but no controller has been
478 * This means we don't need to look any further for
479 * alternate name conventions, and we should really
480 * preserve the return code for our user to be able to
481 * retry probing later.
483 if (IS_ERR(desc) && PTR_ERR(desc) == -EPROBE_DEFER)
486 if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT))
490 /* Special handling for SPI GPIOs if used */
492 desc = of_find_spi_gpio(dev, con_id, &of_flags);
493 if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER) {
494 /* This quirk looks up flags and all */
495 desc = of_find_spi_cs_gpio(dev, con_id, idx, flags);
500 /* Special handling for regulator GPIOs if used */
501 if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
502 desc = of_find_regulator_gpio(dev, con_id, &of_flags);
504 if (IS_ERR(desc) && PTR_ERR(desc) == -ENOENT)
505 desc = of_find_arizona_gpio(dev, con_id, &of_flags);
510 if (of_flags & OF_GPIO_ACTIVE_LOW)
511 *flags |= GPIO_ACTIVE_LOW;
513 if (of_flags & OF_GPIO_SINGLE_ENDED) {
514 if (of_flags & OF_GPIO_OPEN_DRAIN)
515 *flags |= GPIO_OPEN_DRAIN;
517 *flags |= GPIO_OPEN_SOURCE;
520 if (of_flags & OF_GPIO_TRANSITORY)
521 *flags |= GPIO_TRANSITORY;
523 if (of_flags & OF_GPIO_PULL_UP)
524 *flags |= GPIO_PULL_UP;
525 if (of_flags & OF_GPIO_PULL_DOWN)
526 *flags |= GPIO_PULL_DOWN;
532 * of_parse_own_gpio() - Get a GPIO hog descriptor, names and flags for GPIO API
533 * @np: device node to get GPIO from
534 * @chip: GPIO chip whose hog is parsed
535 * @idx: Index of the GPIO to parse
536 * @name: GPIO line name
537 * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from
538 * of_find_gpio() or of_parse_own_gpio()
539 * @dflags: gpiod_flags - optional GPIO initialization flags
541 * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
542 * value on the error condition.
544 static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
545 struct gpio_chip *chip,
546 unsigned int idx, const char **name,
547 unsigned long *lflags,
548 enum gpiod_flags *dflags)
550 struct device_node *chip_np;
551 enum of_gpio_flags xlate_flags;
552 struct of_phandle_args gpiospec;
553 struct gpio_desc *desc;
558 chip_np = chip->of_node;
560 return ERR_PTR(-EINVAL);
563 *lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
566 ret = of_property_read_u32(chip_np, "#gpio-cells", &tmp);
570 gpiospec.np = chip_np;
571 gpiospec.args_count = tmp;
573 for (i = 0; i < tmp; i++) {
574 ret = of_property_read_u32_index(np, "gpios", idx * tmp + i,
580 desc = of_xlate_and_get_gpiod_flags(chip, &gpiospec, &xlate_flags);
584 if (xlate_flags & OF_GPIO_ACTIVE_LOW)
585 *lflags |= GPIO_ACTIVE_LOW;
586 if (xlate_flags & OF_GPIO_TRANSITORY)
587 *lflags |= GPIO_TRANSITORY;
589 if (of_property_read_bool(np, "input"))
591 else if (of_property_read_bool(np, "output-low"))
592 *dflags |= GPIOD_OUT_LOW;
593 else if (of_property_read_bool(np, "output-high"))
594 *dflags |= GPIOD_OUT_HIGH;
596 pr_warn("GPIO line %d (%pOFn): no hogging state specified, bailing out\n",
597 desc_to_gpio(desc), np);
598 return ERR_PTR(-EINVAL);
601 if (name && of_property_read_string(np, "line-name", name))
608 * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions
609 * @chip: gpio chip to act on
611 * This is only used by of_gpiochip_add to request/set GPIO initial
613 * It returns error if it fails otherwise 0 on success.
615 static int of_gpiochip_scan_gpios(struct gpio_chip *chip)
617 struct gpio_desc *desc = NULL;
618 struct device_node *np;
620 unsigned long lflags;
621 enum gpiod_flags dflags;
625 for_each_available_child_of_node(chip->of_node, np) {
626 if (!of_property_read_bool(np, "gpio-hog"))
630 desc = of_parse_own_gpio(np, chip, i, &name, &lflags,
635 ret = gpiod_hog(desc, name, lflags, dflags);
647 * of_gpio_simple_xlate - translate gpiospec to the GPIO number and flags
648 * @gc: pointer to the gpio_chip structure
649 * @gpiospec: GPIO specifier as found in the device tree
650 * @flags: a flags pointer to fill in
652 * This is simple translation function, suitable for the most 1:1 mapped
653 * GPIO chips. This function performs only one sanity check: whether GPIO
654 * is less than ngpios (that is specified in the gpio_chip).
656 static int of_gpio_simple_xlate(struct gpio_chip *gc,
657 const struct of_phandle_args *gpiospec,
661 * We're discouraging gpio_cells < 2, since that way you'll have to
662 * write your own xlate function (that will have to retrieve the GPIO
663 * number and the flags from a single gpio cell -- this is possible,
664 * but not recommended).
666 if (gc->of_gpio_n_cells < 2) {
671 if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
674 if (gpiospec->args[0] >= gc->ngpio)
678 *flags = gpiospec->args[1];
680 return gpiospec->args[0];
684 * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank)
685 * @np: device node of the GPIO chip
686 * @mm_gc: pointer to the of_mm_gpio_chip allocated structure
687 * @data: driver data to store in the struct gpio_chip
689 * To use this function you should allocate and fill mm_gc with:
691 * 1) In the gpio_chip structure:
692 * - all the callbacks
694 * - of_xlate callback (optional)
696 * 3) In the of_mm_gpio_chip structure:
697 * - save_regs callback (optional)
699 * If succeeded, this function will map bank's memory and will
700 * do all necessary work for you. Then you'll able to use .regs
701 * to manage GPIOs from the callbacks.
703 int of_mm_gpiochip_add_data(struct device_node *np,
704 struct of_mm_gpio_chip *mm_gc,
708 struct gpio_chip *gc = &mm_gc->gc;
710 gc->label = kasprintf(GFP_KERNEL, "%pOF", np);
714 mm_gc->regs = of_iomap(np, 0);
720 if (mm_gc->save_regs)
721 mm_gc->save_regs(mm_gc);
723 mm_gc->gc.of_node = np;
725 ret = gpiochip_add_data(gc, data);
731 iounmap(mm_gc->regs);
735 pr_err("%pOF: GPIO chip registration failed with status %d\n", np, ret);
738 EXPORT_SYMBOL_GPL(of_mm_gpiochip_add_data);
741 * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank)
742 * @mm_gc: pointer to the of_mm_gpio_chip allocated structure
744 void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc)
746 struct gpio_chip *gc = &mm_gc->gc;
752 iounmap(mm_gc->regs);
755 EXPORT_SYMBOL_GPL(of_mm_gpiochip_remove);
757 static void of_gpiochip_init_valid_mask(struct gpio_chip *chip)
761 struct device_node *np = chip->of_node;
763 len = of_property_count_u32_elems(np, "gpio-reserved-ranges");
764 if (len < 0 || len % 2 != 0)
767 for (i = 0; i < len; i += 2) {
768 of_property_read_u32_index(np, "gpio-reserved-ranges",
770 of_property_read_u32_index(np, "gpio-reserved-ranges",
772 if (start >= chip->ngpio || start + count >= chip->ngpio)
775 bitmap_clear(chip->valid_mask, start, count);
779 #ifdef CONFIG_PINCTRL
780 static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
782 struct device_node *np = chip->of_node;
783 struct of_phandle_args pinspec;
784 struct pinctrl_dev *pctldev;
787 static const char group_names_propname[] = "gpio-ranges-group-names";
788 struct property *group_names;
793 group_names = of_find_property(np, group_names_propname, NULL);
796 ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
801 pctldev = of_pinctrl_get(pinspec.np);
802 of_node_put(pinspec.np);
804 return -EPROBE_DEFER;
806 if (pinspec.args[2]) {
808 of_property_read_string_index(np,
809 group_names_propname,
812 pr_err("%pOF: Group name of numeric GPIO ranges must be the empty string.\n",
817 /* npins != 0: linear range */
818 ret = gpiochip_add_pin_range(chip,
819 pinctrl_dev_get_devname(pctldev),
826 /* npins == 0: special range */
827 if (pinspec.args[1]) {
828 pr_err("%pOF: Illegal gpio-range format.\n",
834 pr_err("%pOF: GPIO group range requested but no %s property.\n",
835 np, group_names_propname);
839 ret = of_property_read_string_index(np,
840 group_names_propname,
846 pr_err("%pOF: Group name of GPIO group range cannot be the empty string.\n",
851 ret = gpiochip_add_pingroup_range(chip, pctldev,
852 pinspec.args[0], name);
862 static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; }
865 int of_gpiochip_add(struct gpio_chip *chip)
872 if (!chip->of_xlate) {
873 chip->of_gpio_n_cells = 2;
874 chip->of_xlate = of_gpio_simple_xlate;
877 if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS)
880 of_gpiochip_init_valid_mask(chip);
882 ret = of_gpiochip_add_pin_range(chip);
886 /* If the chip defines names itself, these take precedence */
888 devprop_gpiochip_set_names(chip,
889 of_fwnode_handle(chip->of_node));
891 of_node_get(chip->of_node);
893 ret = of_gpiochip_scan_gpios(chip);
895 of_node_put(chip->of_node);
896 gpiochip_remove_pin_ranges(chip);
902 void of_gpiochip_remove(struct gpio_chip *chip)
904 gpiochip_remove_pin_ranges(chip);
905 of_node_put(chip->of_node);