1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2013 Google, Inc
10 #include <dm/device_compat.h>
11 #include <dm/device-internal.h>
13 #include <dm/uclass-internal.h>
14 #include <dt-bindings/gpio/gpio.h>
18 #include <acpi/acpi_device.h>
19 #include <asm/global_data.h>
21 #include <dm/device_compat.h>
22 #include <linux/bug.h>
23 #include <linux/ctype.h>
25 DECLARE_GLOBAL_DATA_PTR;
28 * gpio_desc_init() - Initialize the GPIO descriptor
30 * @desc: GPIO descriptor to initialize
32 * @offset: Offset of device GPIO
34 static void gpio_desc_init(struct gpio_desc *desc,
39 desc->offset = offset;
44 * gpio_to_device() - Convert global GPIO number to device, number
46 * Convert the GPIO number to an entry in the list of GPIOs
47 * or GPIO blocks registered with the GPIO controller. Returns
48 * entry on success, NULL on error.
50 * @gpio: The numeric representation of the GPIO
51 * @desc: Returns description (desc->flags will always be 0)
52 * @return 0 if found, -ENOENT if not found
54 static int gpio_to_device(unsigned int gpio, struct gpio_desc *desc)
56 struct gpio_dev_priv *uc_priv;
60 for (ret = uclass_first_device(UCLASS_GPIO, &dev);
62 ret = uclass_next_device(&dev)) {
63 uc_priv = dev_get_uclass_priv(dev);
64 if (gpio >= uc_priv->gpio_base &&
65 gpio < uc_priv->gpio_base + uc_priv->gpio_count) {
66 gpio_desc_init(desc, dev, gpio - uc_priv->gpio_base);
72 return ret ? ret : -ENOENT;
75 #if CONFIG_IS_ENABLED(DM_GPIO_LOOKUP_LABEL)
77 * dm_gpio_lookup_label() - look for name in gpio device
79 * search in uc_priv, if there is a gpio with labelname same
82 * @name: name which is searched
83 * @uc_priv: gpio_dev_priv pointer.
84 * @offset: gpio offset within the device
85 * @return: 0 if found, -ENOENT if not.
87 static int dm_gpio_lookup_label(const char *name,
88 struct gpio_dev_priv *uc_priv, ulong *offset)
95 for (i = 0; i < uc_priv->gpio_count; i++) {
96 if (!uc_priv->name[i])
98 if (!strncmp(name, uc_priv->name[i], len)) {
107 dm_gpio_lookup_label(const char *name, struct gpio_dev_priv *uc_priv,
114 int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc)
116 struct gpio_dev_priv *uc_priv = NULL;
122 numeric = isdigit(*name) ? simple_strtoul(name, NULL, 10) : -1;
123 for (ret = uclass_first_device(UCLASS_GPIO, &dev);
125 ret = uclass_next_device(&dev)) {
128 uc_priv = dev_get_uclass_priv(dev);
130 offset = numeric - uc_priv->gpio_base;
131 /* Allow GPIOs to be numbered from 0 */
132 if (offset < uc_priv->gpio_count)
136 len = uc_priv->bank_name ? strlen(uc_priv->bank_name) : 0;
138 if (!strncasecmp(name, uc_priv->bank_name, len)) {
139 if (!strict_strtoul(name + len, 10, &offset))
144 * if we did not found a gpio through its bank
145 * name, we search for a valid gpio label.
147 if (!dm_gpio_lookup_label(name, uc_priv, &offset))
152 return ret ? ret : -EINVAL;
154 gpio_desc_init(desc, dev, offset);
159 int gpio_lookup_name(const char *name, struct udevice **devp,
160 unsigned int *offsetp, unsigned int *gpiop)
162 struct gpio_desc desc;
167 ret = dm_gpio_lookup_name(name, &desc);
174 *offsetp = desc.offset;
176 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(desc.dev);
178 *gpiop = uc_priv->gpio_base + desc.offset;
184 int gpio_xlate_offs_flags(struct udevice *dev, struct gpio_desc *desc,
185 struct ofnode_phandle_args *args)
187 if (args->args_count < 1)
190 desc->offset = args->args[0];
192 if (args->args_count < 2)
196 if (args->args[1] & GPIO_ACTIVE_LOW)
197 desc->flags |= GPIOD_ACTIVE_LOW;
200 * need to test 2 bits for gpio output binding:
201 * OPEN_DRAIN (0x6) = SINGLE_ENDED (0x2) | LINE_OPEN_DRAIN (0x4)
202 * OPEN_SOURCE (0x2) = SINGLE_ENDED (0x2) | LINE_OPEN_SOURCE (0x0)
204 if (args->args[1] & GPIO_SINGLE_ENDED) {
205 if (args->args[1] & GPIO_LINE_OPEN_DRAIN)
206 desc->flags |= GPIOD_OPEN_DRAIN;
208 desc->flags |= GPIOD_OPEN_SOURCE;
211 if (args->args[1] & GPIO_PULL_UP)
212 desc->flags |= GPIOD_PULL_UP;
214 if (args->args[1] & GPIO_PULL_DOWN)
215 desc->flags |= GPIOD_PULL_DOWN;
220 static int gpio_find_and_xlate(struct gpio_desc *desc,
221 struct ofnode_phandle_args *args)
223 struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
226 return ops->xlate(desc->dev, desc, args);
228 return gpio_xlate_offs_flags(desc->dev, desc, args);
231 #if defined(CONFIG_GPIO_HOG)
233 struct gpio_hog_priv {
234 struct gpio_desc gpiod;
237 struct gpio_hog_data {
243 static int gpio_hog_of_to_plat(struct udevice *dev)
245 struct gpio_hog_data *plat = dev_get_plat(dev);
246 const char *nodename;
250 if (dev_read_bool(dev, "input")) {
251 plat->gpiod_flags = GPIOD_IS_IN;
252 } else if (dev_read_bool(dev, "output-high")) {
254 plat->gpiod_flags = GPIOD_IS_OUT;
255 } else if (dev_read_bool(dev, "output-low")) {
256 plat->gpiod_flags = GPIOD_IS_OUT;
258 printf("%s: missing gpio-hog state.\n", __func__);
261 ret = dev_read_u32_array(dev, "gpios", plat->val, 2);
263 printf("%s: wrong gpios property, 2 values needed %d\n",
267 nodename = dev_read_string(dev, "line-name");
269 device_set_name(dev, nodename);
274 static int gpio_hog_probe(struct udevice *dev)
276 struct gpio_hog_data *plat = dev_get_plat(dev);
277 struct gpio_hog_priv *priv = dev_get_priv(dev);
280 ret = gpio_dev_request_index(dev->parent, dev->name, "gpio-hog",
281 plat->val[0], plat->gpiod_flags,
282 plat->val[1], &priv->gpiod);
284 debug("%s: node %s could not get gpio.\n", __func__,
289 if (plat->gpiod_flags == GPIOD_IS_OUT) {
290 ret = dm_gpio_set_value(&priv->gpiod, plat->value);
292 debug("%s: node %s could not set gpio.\n", __func__,
301 int gpio_hog_probe_all(void)
307 for (uclass_first_device(UCLASS_NOP, &dev);
309 uclass_find_next_device(&dev)) {
310 if (dev->driver == DM_DRIVER_GET(gpio_hog)) {
311 ret = device_probe(dev);
313 printf("Failed to probe device %s err: %d\n",
323 int gpio_hog_lookup_name(const char *name, struct gpio_desc **desc)
328 gpio_hog_probe_all();
329 if (!uclass_get_device_by_name(UCLASS_NOP, name, &dev)) {
330 struct gpio_hog_priv *priv = dev_get_priv(dev);
332 *desc = &priv->gpiod;
339 U_BOOT_DRIVER(gpio_hog) = {
342 .of_to_plat = gpio_hog_of_to_plat,
343 .probe = gpio_hog_probe,
344 .priv_auto = sizeof(struct gpio_hog_priv),
345 .plat_auto = sizeof(struct gpio_hog_data),
348 int gpio_hog_lookup_name(const char *name, struct gpio_desc **desc)
354 int dm_gpio_request(struct gpio_desc *desc, const char *label)
356 struct udevice *dev = desc->dev;
357 struct gpio_dev_priv *uc_priv;
361 uc_priv = dev_get_uclass_priv(dev);
362 if (uc_priv->name[desc->offset])
367 if (gpio_get_ops(dev)->request) {
368 ret = gpio_get_ops(dev)->request(dev, desc->offset, label);
374 uc_priv->name[desc->offset] = str;
379 static int dm_gpio_requestf(struct gpio_desc *desc, const char *fmt, ...)
381 #if !defined(CONFIG_SPL_BUILD) || !CONFIG_IS_ENABLED(USE_TINY_PRINTF)
386 vscnprintf(buf, sizeof(buf), fmt, args);
388 return dm_gpio_request(desc, buf);
390 return dm_gpio_request(desc, fmt);
395 * gpio_request() - [COMPAT] Request GPIO
397 * label: Name for the requested GPIO
399 * The label is copied and allocated so the caller does not need to keep
400 * the pointer around.
402 * This function implements the API that's compatible with current
403 * GPIO API used in U-Boot. The request is forwarded to particular
404 * GPIO driver. Returns 0 on success, negative value on error.
406 int gpio_request(unsigned gpio, const char *label)
408 struct gpio_desc desc;
411 ret = gpio_to_device(gpio, &desc);
415 return dm_gpio_request(&desc, label);
419 * gpio_requestf() - [COMPAT] Request GPIO
421 * @fmt: Format string for the requested GPIO
422 * @...: Arguments for the printf() format string
424 * This function implements the API that's compatible with current
425 * GPIO API used in U-Boot. The request is forwarded to particular
426 * GPIO driver. Returns 0 on success, negative value on error.
428 int gpio_requestf(unsigned gpio, const char *fmt, ...)
430 #if !defined(CONFIG_SPL_BUILD) || !CONFIG_IS_ENABLED(USE_TINY_PRINTF)
435 vscnprintf(buf, sizeof(buf), fmt, args);
437 return gpio_request(gpio, buf);
439 return gpio_request(gpio, fmt);
443 int _dm_gpio_free(struct udevice *dev, uint offset)
445 struct gpio_dev_priv *uc_priv;
448 uc_priv = dev_get_uclass_priv(dev);
449 if (!uc_priv->name[offset])
451 if (gpio_get_ops(dev)->rfree) {
452 ret = gpio_get_ops(dev)->rfree(dev, offset);
457 free(uc_priv->name[offset]);
458 uc_priv->name[offset] = NULL;
464 * gpio_free() - [COMPAT] Relinquish GPIO
467 * This function implements the API that's compatible with current
468 * GPIO API used in U-Boot. The request is forwarded to particular
469 * GPIO driver. Returns 0 on success, negative value on error.
471 int gpio_free(unsigned gpio)
473 struct gpio_desc desc;
476 ret = gpio_to_device(gpio, &desc);
480 return _dm_gpio_free(desc.dev, desc.offset);
483 static int check_reserved(const struct gpio_desc *desc, const char *func)
485 struct gpio_dev_priv *uc_priv;
487 if (!dm_gpio_is_valid(desc))
490 uc_priv = dev_get_uclass_priv(desc->dev);
491 if (!uc_priv->name[desc->offset]) {
492 printf("%s: %s: error: gpio %s%d not reserved\n",
493 desc->dev->name, func,
494 uc_priv->bank_name ? uc_priv->bank_name : "",
503 * gpio_direction_input() - [COMPAT] Set GPIO direction to input
506 * This function implements the API that's compatible with current
507 * GPIO API used in U-Boot. The request is forwarded to particular
508 * GPIO driver. Returns 0 on success, negative value on error.
510 int gpio_direction_input(unsigned gpio)
512 struct gpio_desc desc;
515 ret = gpio_to_device(gpio, &desc);
518 ret = check_reserved(&desc, "dir_input");
522 return gpio_get_ops(desc.dev)->direction_input(desc.dev, desc.offset);
526 * gpio_direction_output() - [COMPAT] Set GPIO direction to output and set value
528 * value: Logical value to be set on the GPIO pin
530 * This function implements the API that's compatible with current
531 * GPIO API used in U-Boot. The request is forwarded to particular
532 * GPIO driver. Returns 0 on success, negative value on error.
534 int gpio_direction_output(unsigned gpio, int value)
536 struct gpio_desc desc;
539 ret = gpio_to_device(gpio, &desc);
542 ret = check_reserved(&desc, "dir_output");
546 return gpio_get_ops(desc.dev)->direction_output(desc.dev,
550 static int _gpio_get_value(const struct gpio_desc *desc)
554 value = gpio_get_ops(desc->dev)->get_value(desc->dev, desc->offset);
556 return desc->flags & GPIOD_ACTIVE_LOW ? !value : value;
559 int dm_gpio_get_value(const struct gpio_desc *desc)
563 ret = check_reserved(desc, "get_value");
567 return _gpio_get_value(desc);
570 int dm_gpio_set_value(const struct gpio_desc *desc, int value)
574 ret = check_reserved(desc, "set_value");
578 if (desc->flags & GPIOD_ACTIVE_LOW)
582 * Emulate open drain by not actively driving the line high or
583 * Emulate open source by not actively driving the line low
585 if ((desc->flags & GPIOD_OPEN_DRAIN && value) ||
586 (desc->flags & GPIOD_OPEN_SOURCE && !value))
587 return gpio_get_ops(desc->dev)->direction_input(desc->dev,
589 else if (desc->flags & GPIOD_OPEN_DRAIN ||
590 desc->flags & GPIOD_OPEN_SOURCE)
591 return gpio_get_ops(desc->dev)->direction_output(desc->dev,
595 gpio_get_ops(desc->dev)->set_value(desc->dev, desc->offset, value);
599 /* check dir flags invalid configuration */
600 static int check_dir_flags(ulong flags)
602 if ((flags & GPIOD_IS_OUT) && (flags & GPIOD_IS_IN)) {
603 log_debug("%s: flags 0x%lx has GPIOD_IS_OUT and GPIOD_IS_IN\n",
608 if ((flags & GPIOD_PULL_UP) && (flags & GPIOD_PULL_DOWN)) {
609 log_debug("%s: flags 0x%lx has GPIOD_PULL_UP and GPIOD_PULL_DOWN\n",
614 if ((flags & GPIOD_OPEN_DRAIN) && (flags & GPIOD_OPEN_SOURCE)) {
615 log_debug("%s: flags 0x%lx has GPIOD_OPEN_DRAIN and GPIOD_OPEN_SOURCE\n",
623 static int _dm_gpio_set_flags(struct gpio_desc *desc, ulong flags)
625 struct udevice *dev = desc->dev;
626 struct dm_gpio_ops *ops = gpio_get_ops(dev);
627 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
630 ret = check_dir_flags(flags);
633 "%s error: set_dir_flags for gpio %s%d has invalid dir flags 0x%lx\n",
635 uc_priv->bank_name ? uc_priv->bank_name : "",
636 desc->offset, flags);
641 /* GPIOD_ are directly managed by driver in set_flags */
642 if (ops->set_flags) {
643 ret = ops->set_flags(dev, desc->offset, flags);
645 if (flags & GPIOD_IS_OUT) {
646 ret = ops->direction_output(dev, desc->offset,
647 GPIOD_FLAGS_OUTPUT(flags));
648 } else if (flags & GPIOD_IS_IN) {
649 ret = ops->direction_input(dev, desc->offset);
653 /* save the flags also in descriptor */
660 int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
664 ret = check_reserved(desc, "set_dir_flags");
668 /* combine the requested flags (for IN/OUT) and the descriptor flags */
669 flags |= desc->flags;
670 ret = _dm_gpio_set_flags(desc, flags);
675 int dm_gpio_set_dir(struct gpio_desc *desc)
679 ret = check_reserved(desc, "set_dir");
683 return _dm_gpio_set_flags(desc, desc->flags);
686 int dm_gpio_get_flags(struct gpio_desc *desc, ulong *flagsp)
688 struct udevice *dev = desc->dev;
690 struct dm_gpio_ops *ops = gpio_get_ops(dev);
693 ret = check_reserved(desc, "get_flags");
697 /* GPIOD_ are directly provided by driver except GPIOD_ACTIVE_LOW */
698 if (ops->get_flags) {
699 ret = ops->get_flags(dev, desc->offset, &flags);
703 /* GPIOD_ACTIVE_LOW is saved in desc->flags */
704 value = flags & GPIOD_IS_OUT_ACTIVE ? 1 : 0;
705 if (desc->flags & GPIOD_ACTIVE_LOW)
707 flags &= ~(GPIOD_ACTIVE_LOW | GPIOD_IS_OUT_ACTIVE);
708 flags |= (desc->flags & GPIOD_ACTIVE_LOW);
710 flags |= GPIOD_IS_OUT_ACTIVE;
713 /* only GPIOD_IS_OUT_ACTIVE is provided by uclass */
714 flags &= ~GPIOD_IS_OUT_ACTIVE;
715 if ((desc->flags & GPIOD_IS_OUT) && _gpio_get_value(desc))
716 flags |= GPIOD_IS_OUT_ACTIVE;
724 * gpio_get_value() - [COMPAT] Sample GPIO pin and return it's value
727 * This function implements the API that's compatible with current
728 * GPIO API used in U-Boot. The request is forwarded to particular
729 * GPIO driver. Returns the value of the GPIO pin, or negative value
732 int gpio_get_value(unsigned gpio)
736 struct gpio_desc desc;
738 ret = gpio_to_device(gpio, &desc);
741 return dm_gpio_get_value(&desc);
745 * gpio_set_value() - [COMPAT] Configure logical value on GPIO pin
747 * value: Logical value to be set on the GPIO pin.
749 * This function implements the API that's compatible with current
750 * GPIO API used in U-Boot. The request is forwarded to particular
751 * GPIO driver. Returns 0 on success, negative value on error.
753 int gpio_set_value(unsigned gpio, int value)
755 struct gpio_desc desc;
758 ret = gpio_to_device(gpio, &desc);
761 return dm_gpio_set_value(&desc, value);
764 const char *gpio_get_bank_info(struct udevice *dev, int *bit_count)
766 struct gpio_dev_priv *priv;
768 /* Must be called on an active device */
769 priv = dev_get_uclass_priv(dev);
772 *bit_count = priv->gpio_count;
773 return priv->bank_name;
776 static const char * const gpio_function[GPIOF_COUNT] = {
784 static int get_function(struct udevice *dev, int offset, bool skip_unused,
787 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
788 struct dm_gpio_ops *ops = gpio_get_ops(dev);
790 BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
791 if (!device_active(dev))
793 if (offset < 0 || offset >= uc_priv->gpio_count)
796 *namep = uc_priv->name[offset];
797 if (skip_unused && !uc_priv->name[offset])
799 if (ops->get_function) {
802 ret = ops->get_function(dev, offset);
805 if (ret >= ARRAY_SIZE(gpio_function))
810 return GPIOF_UNKNOWN;
813 int gpio_get_function(struct udevice *dev, int offset, const char **namep)
815 return get_function(dev, offset, true, namep);
818 int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep)
820 return get_function(dev, offset, false, namep);
823 int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize)
825 struct dm_gpio_ops *ops = gpio_get_ops(dev);
826 struct gpio_dev_priv *priv;
832 BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
835 priv = dev_get_uclass_priv(dev);
836 ret = gpio_get_raw_function(dev, offset, NULL);
840 len = snprintf(str, buffsize, "%s%d: %s",
841 priv->bank_name ? priv->bank_name : "",
842 offset, gpio_function[func]);
843 if (func == GPIOF_INPUT || func == GPIOF_OUTPUT ||
844 func == GPIOF_UNUSED) {
848 ret = ops->get_value(dev, offset);
851 used = gpio_get_function(dev, offset, &label) != GPIOF_UNUSED;
852 snprintf(str + len, buffsize - len, ": %d [%c]%s%s",
862 #if CONFIG_IS_ENABLED(ACPIGEN)
863 int gpio_get_acpi(const struct gpio_desc *desc, struct acpi_gpio *gpio)
865 struct dm_gpio_ops *ops;
867 memset(gpio, '\0', sizeof(*gpio));
868 if (!dm_gpio_is_valid(desc)) {
869 /* Indicate that the GPIO is not valid */
875 ops = gpio_get_ops(desc->dev);
879 return ops->get_acpi(desc, gpio);
883 int gpio_claim_vector(const int *gpio_num_array, const char *fmt)
888 for (i = 0; i < 32; i++) {
889 gpio = gpio_num_array[i];
892 ret = gpio_requestf(gpio, fmt, i);
895 ret = gpio_direction_input(gpio);
904 for (i--; i >= 0; i--)
905 gpio_free(gpio_num_array[i]);
911 * get a number comprised of multiple GPIO values. gpio_num_array points to
912 * the array of gpio pin numbers to scan, terminated by -1.
914 int gpio_get_values_as_int(const int *gpio_list)
917 unsigned bitmask = 1;
922 ((gpio = *gpio_list++) != -1)) {
923 ret = gpio_get_value(gpio);
934 int dm_gpio_get_values_as_int(const struct gpio_desc *desc_list, int count)
936 unsigned bitmask = 1;
940 for (i = 0; i < count; i++) {
941 ret = dm_gpio_get_value(&desc_list[i]);
953 * gpio_request_tail: common work for requesting a gpio.
955 * ret: return value from previous work in function which calls
957 * This seems bogus (why calling this function instead not
958 * calling it and end caller function instead?).
959 * Because on error in caller function we want to set some
960 * default values in gpio desc and have a common error
961 * debug message, which provides this function.
962 * nodename: Name of node for which gpio gets requested
963 * used for gpio label name.
964 * args: pointer to output arguments structure
965 * list_name: Name of GPIO list
966 * used for gpio label name.
967 * index: gpio index in gpio list
968 * used for gpio label name.
969 * desc: pointer to gpio descriptor, filled from this
971 * flags: gpio flags to use.
972 * add_index: should index added to gpio label name
973 * gpio_dev: pointer to gpio device from which the gpio
974 * will be requested. If NULL try to get the
975 * gpio device with uclass_get_device_by_ofnode()
977 * return: In error case this function sets default values in
978 * gpio descriptor, also emmits a debug message.
979 * On success it returns 0 else the error code from
980 * function calls, or the error code passed through
981 * ret to this function.
984 static int gpio_request_tail(int ret, const char *nodename,
985 struct ofnode_phandle_args *args,
986 const char *list_name, int index,
987 struct gpio_desc *desc, int flags,
988 bool add_index, struct udevice *gpio_dev)
990 gpio_desc_init(desc, gpio_dev, 0);
995 ret = uclass_get_device_by_ofnode(UCLASS_GPIO, args->node,
998 debug("%s: uclass_get_device_by_ofnode failed\n",
1003 ret = gpio_find_and_xlate(desc, args);
1005 debug("%s: gpio_find_and_xlate failed\n", __func__);
1008 ret = dm_gpio_requestf(desc, add_index ? "%s.%s%d" : "%s.%s",
1009 nodename, list_name, index);
1011 debug("%s: dm_gpio_requestf failed\n", __func__);
1014 ret = dm_gpio_set_dir_flags(desc, flags);
1016 debug("%s: dm_gpio_set_dir failed\n", __func__);
1022 debug("%s: Node '%s', property '%s', failed to request GPIO index %d: %d\n",
1023 __func__, nodename, list_name, index, ret);
1027 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
1028 static int _gpio_request_by_name_nodev(ofnode node, const char *list_name,
1029 int index, struct gpio_desc *desc,
1030 int flags, bool add_index)
1032 struct ofnode_phandle_args args;
1035 ret = ofnode_parse_phandle_with_args(node, list_name, "#gpio-cells", 0,
1038 return gpio_request_tail(ret, ofnode_get_name(node), &args, list_name,
1039 index, desc, flags, add_index, NULL);
1042 int gpio_request_by_name_nodev(ofnode node, const char *list_name, int index,
1043 struct gpio_desc *desc, int flags)
1045 return _gpio_request_by_name_nodev(node, list_name, index, desc, flags,
1049 int gpio_request_by_name(struct udevice *dev, const char *list_name, int index,
1050 struct gpio_desc *desc, int flags)
1052 struct ofnode_phandle_args args;
1056 ret = dev_read_phandle_with_args(dev, list_name, "#gpio-cells", 0,
1058 node = dev_ofnode(dev);
1059 return gpio_request_tail(ret, ofnode_get_name(node), &args, list_name,
1060 index, desc, flags, index > 0, NULL);
1063 int gpio_request_list_by_name_nodev(ofnode node, const char *list_name,
1064 struct gpio_desc *desc, int max_count,
1070 for (count = 0; count < max_count; count++) {
1071 ret = _gpio_request_by_name_nodev(node, list_name, count,
1072 &desc[count], flags, true);
1079 /* We ran out of GPIOs in the list */
1083 gpio_free_list_nodev(desc, count - 1);
1088 int gpio_request_list_by_name(struct udevice *dev, const char *list_name,
1089 struct gpio_desc *desc, int max_count,
1093 * This isn't ideal since we don't use dev->name in the debug()
1094 * calls in gpio_request_by_name(), but we can do this until
1095 * gpio_request_list_by_name_nodev() can be dropped.
1097 return gpio_request_list_by_name_nodev(dev_ofnode(dev), list_name, desc,
1101 int gpio_get_list_count(struct udevice *dev, const char *list_name)
1105 ret = dev_read_phandle_with_args(dev, list_name, "#gpio-cells", 0, -1,
1108 debug("%s: Node '%s', property '%s', GPIO count failed: %d\n",
1109 __func__, dev->name, list_name, ret);
1114 #endif /* OF_PLATDATA */
1116 int dm_gpio_free(struct udevice *dev, struct gpio_desc *desc)
1118 /* For now, we don't do any checking of dev */
1119 return _dm_gpio_free(desc->dev, desc->offset);
1122 int gpio_free_list(struct udevice *dev, struct gpio_desc *desc, int count)
1126 /* For now, we don't do any checking of dev */
1127 for (i = 0; i < count; i++)
1128 dm_gpio_free(dev, &desc[i]);
1133 int gpio_free_list_nodev(struct gpio_desc *desc, int count)
1135 return gpio_free_list(NULL, desc, count);
1138 /* We need to renumber the GPIOs when any driver is probed/removed */
1139 static int gpio_renumber(struct udevice *removed_dev)
1141 struct gpio_dev_priv *uc_priv;
1142 struct udevice *dev;
1147 ret = uclass_get(UCLASS_GPIO, &uc);
1151 /* Ensure that we have a base for each bank */
1153 uclass_foreach_dev(dev, uc) {
1154 if (device_active(dev) && dev != removed_dev) {
1155 uc_priv = dev_get_uclass_priv(dev);
1156 uc_priv->gpio_base = base;
1157 base += uc_priv->gpio_count;
1164 int gpio_get_number(const struct gpio_desc *desc)
1166 struct udevice *dev = desc->dev;
1167 struct gpio_dev_priv *uc_priv;
1171 uc_priv = dev_get_uclass_priv(dev);
1173 return uc_priv->gpio_base + desc->offset;
1176 static int gpio_post_probe(struct udevice *dev)
1178 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
1180 uc_priv->name = calloc(uc_priv->gpio_count, sizeof(char *));
1184 return gpio_renumber(NULL);
1187 static int gpio_pre_remove(struct udevice *dev)
1189 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
1192 for (i = 0; i < uc_priv->gpio_count; i++) {
1193 if (uc_priv->name[i])
1194 free(uc_priv->name[i]);
1196 free(uc_priv->name);
1198 return gpio_renumber(dev);
1201 int gpio_dev_request_index(struct udevice *dev, const char *nodename,
1202 char *list_name, int index, int flags,
1203 int dtflags, struct gpio_desc *desc)
1205 struct ofnode_phandle_args args;
1207 args.node = ofnode_null();
1208 args.args_count = 2;
1209 args.args[0] = index;
1210 args.args[1] = dtflags;
1212 return gpio_request_tail(0, nodename, &args, list_name, index, desc,
1216 static void devm_gpiod_release(struct udevice *dev, void *res)
1218 dm_gpio_free(dev, res);
1221 static int devm_gpiod_match(struct udevice *dev, void *res, void *data)
1226 struct gpio_desc *devm_gpiod_get_index(struct udevice *dev, const char *id,
1227 unsigned int index, int flags)
1230 struct gpio_desc *desc;
1232 static const char suffix[] = "-gpios";
1234 propname = malloc(strlen(id) + sizeof(suffix));
1240 strcpy(propname, id);
1241 strcat(propname, suffix);
1243 desc = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc),
1245 if (unlikely(!desc)) {
1250 rc = gpio_request_by_name(dev, propname, index, desc, flags);
1259 devres_add(dev, desc);
1264 struct gpio_desc *devm_gpiod_get_index_optional(struct udevice *dev,
1269 struct gpio_desc *desc = devm_gpiod_get_index(dev, id, index, flags);
1277 void devm_gpiod_put(struct udevice *dev, struct gpio_desc *desc)
1281 rc = devres_release(dev, devm_gpiod_release, devm_gpiod_match, desc);
1285 static int gpio_post_bind(struct udevice *dev)
1287 struct udevice *child;
1290 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
1291 struct dm_gpio_ops *ops = (struct dm_gpio_ops *)device_get_ops(dev);
1292 static int reloc_done;
1296 ops->request += gd->reloc_off;
1298 ops->rfree += gd->reloc_off;
1299 if (ops->direction_input)
1300 ops->direction_input += gd->reloc_off;
1301 if (ops->direction_output)
1302 ops->direction_output += gd->reloc_off;
1304 ops->get_value += gd->reloc_off;
1306 ops->set_value += gd->reloc_off;
1307 if (ops->get_function)
1308 ops->get_function += gd->reloc_off;
1310 ops->xlate += gd->reloc_off;
1312 ops->set_flags += gd->reloc_off;
1314 ops->get_flags += gd->reloc_off;
1320 if (IS_ENABLED(CONFIG_GPIO_HOG)) {
1321 dev_for_each_subnode(node, dev) {
1322 if (ofnode_read_bool(node, "gpio-hog")) {
1323 const char *name = ofnode_get_name(node);
1326 ret = device_bind_driver_to_node(dev,
1338 UCLASS_DRIVER(gpio) = {
1341 .flags = DM_UC_FLAG_SEQ_ALIAS,
1342 .post_probe = gpio_post_probe,
1343 .post_bind = gpio_post_bind,
1344 .pre_remove = gpio_pre_remove,
1345 .per_device_auto = sizeof(struct gpio_dev_priv),