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gpio: Add gpio_request_by_line_name()

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Add support for the upstream gpio-line-names property already described
in the common GPIO binding document[1]. The ability to search for a line
name allows boards to lift the implementation of common GPIO behaviours
away from specific line indexes on a GPIO controller.

[1] 3c35bfee83/dtschema/schemas/gpio/gpio.yaml (L17)

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
This commit is contained in:
Andrew Jeffery 2022-01-31 13:54:05 +10:30 committed by Tom Rini
parent 965b989fb6
commit 34be6968c3
2 changed files with 45 additions and 0 deletions
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26
drivers/gpio/gpio-uclass.c
View File

@ -1187,6 +1187,32 @@ int gpio_request_by_name(struct udevice *dev, const char *list_name, int index,
index, desc, flags, index > 0, NULL);
}
int gpio_request_by_line_name(struct udevice *dev, const char *line_name,
struct gpio_desc *desc, int flags)
{
int ret;
ret = dev_read_stringlist_search(dev, "gpio-line-names", line_name);
if (ret < 0)
return ret;
desc->dev = dev;
desc->offset = ret;
desc->flags = 0;
ret = dm_gpio_request(desc, line_name);
if (ret) {
debug("%s: dm_gpio_requestf failed\n", __func__);
return ret;
}
ret = dm_gpio_set_dir_flags(desc, flags | desc->flags);
if (ret)
debug("%s: dm_gpio_set_dir failed\n", __func__);
return ret;
}
int gpio_request_list_by_name_nodev(ofnode node, const char *list_name,
struct gpio_desc *desc, int max_count,
int flags)

19
include/asm-generic/gpio.h
View File

@ -579,6 +579,25 @@ int gpio_claim_vector(const int *gpio_num_array, const char *fmt);
int gpio_request_by_name(struct udevice *dev, const char *list_name,
int index, struct gpio_desc *desc, int flags);
/* gpio_request_by_line_name - Locate and request a GPIO by line name
*
* Request a GPIO using the offset of the provided line name in the
* gpio-line-names property found in the OF node of the GPIO udevice.
*
* This allows boards to implement common behaviours using GPIOs while not
* requiring specific GPIO offsets be used.
*
* @dev: An instance of a GPIO controller udevice
* @line_name: The name of the GPIO (e.g. "bmc-secure-boot")
* @desc: A GPIO descriptor that is populated with the requested GPIO
* upon return
* @flags: The GPIO settings apply to the request
* @return 0 if the named line was found and requested successfully, or a
* negative error code if the GPIO cannot be found or the request failed.
*/
int gpio_request_by_line_name(struct udevice *dev, const char *line_name,
struct gpio_desc *desc, int flags);
/**
* gpio_request_list_by_name() - Request a list of GPIOs
*