Commit 1feb57a2 authored by Olliver Schinagl's avatar Olliver Schinagl Committed by Linus Walleij
Browse files

gpio: add parameter to allow the use named gpios 



The gpio binding document says that new code should always use named
gpios. Patch 40b73183 added support to parse a list of gpios from child
nodes, but does not make it possible to use named gpios. This patch adds
the con_id property and implements it is done in gpiolib.c, where the
old-style of using unnamed gpios still works.

Signed-off-by: default avatarOlliver Schinagl <oliver@schinagl.nl>
Acked-by: default avatarBryan Wu <cooloney@gmail.com>
Acked-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent b80eef95

drivers/gpio/devres.c

+17 −1
Original line number Diff line number Diff line
@@ -111,23 +111,39 @@ EXPORT_SYMBOL(__devm_gpiod_get_index); 
/**

 * devm_get_gpiod_from_child - get a GPIO descriptor from a device's child node

 * @dev:	GPIO consumer

 * @con_id:	function within the GPIO consumer

 * @child:	firmware node (child of @dev)

 *

 * GPIO descriptors returned from this function are automatically disposed on

 * driver detach.

 */

struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,

					    const char *con_id,

					    struct fwnode_handle *child)

{

	static const char const *suffixes[] = { "gpios", "gpio" };

	char prop_name[32]; /* 32 is max size of property name */

	struct gpio_desc **dr;

	struct gpio_desc *desc;

	unsigned int i;



	dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),

			  GFP_KERNEL);

	if (!dr)

		return ERR_PTR(-ENOMEM);



	desc = fwnode_get_named_gpiod(child, "gpios");

	for (i = 0; i < ARRAY_SIZE(suffixes); i++) {

		if (con_id)

			snprintf(prop_name, sizeof(prop_name), "%s-%s",

					    con_id, suffixes[i]);

		else

			snprintf(prop_name, sizeof(prop_name), "%s",

							       suffixes[i]);



		desc = fwnode_get_named_gpiod(child, prop_name);

		if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))

			break;

	}

	if (IS_ERR(desc)) {

		devres_free(dr);

		return desc;

drivers/input/keyboard/gpio_keys_polled.c

+1 −1
Original line number Diff line number Diff line
@@ -125,7 +125,7 @@ static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct 
	device_for_each_child_node(dev, child) {

		struct gpio_desc *desc;



		desc = devm_get_gpiod_from_child(dev, child);

		desc = devm_get_gpiod_from_child(dev, NULL, child);

		if (IS_ERR(desc)) {

			error = PTR_ERR(desc);

			if (error != -EPROBE_DEFER)

drivers/leds/leds-gpio.c

+1 −1
Original line number Diff line number Diff line
@@ -184,7 +184,7 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev) 
		struct gpio_led led = {};

		const char *state = NULL;



		led.gpiod = devm_get_gpiod_from_child(dev, child);

		led.gpiod = devm_get_gpiod_from_child(dev, NULL, child);

		if (IS_ERR(led.gpiod)) {

			fwnode_handle_put(child);

			ret = PTR_ERR(led.gpiod);

include/linux/gpio/consumer.h

+1 −0
Original line number Diff line number Diff line
@@ -110,6 +110,7 @@ struct fwnode_handle; 
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,

					 const char *propname);

struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,

					    const char *con_id,

					    struct fwnode_handle *child);

#else /* CONFIG_GPIOLIB */

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