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gpiolib: of: Allow "trigger-sources" to reference a GPIO

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The "trigger-sources" phandle used for LED triggers are special:
the DT bindings mandate that such triggers have the same phandle
references no matter what the trigger is. A GPIO is just another
kind of device that can trigger a LED.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Linus Walleij 2023-09-26 23:48:11 +02:00 committed by Bartosz Golaszewski
parent 46d0825104
commit 3bb5c9ddf4
1 changed files with 28 additions and 0 deletions
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28
drivers/gpio/gpiolib-of.c
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@ -620,6 +620,33 @@ static struct gpio_desc *of_find_mt2701_gpio(struct device_node *np,
return desc;
}
/*
* Trigger sources are special, they allow us to use any GPIO as a LED trigger
* and have the name "trigger-sources" no matter which kind of phandle it is
* pointing to, whether to a GPIO, a USB host, a network PHY etc. So in this case
* we allow looking something up that is not named "foo-gpios".
*/
static struct gpio_desc *of_find_trigger_gpio(struct device_node *np,
const char *con_id,
unsigned int idx,
enum of_gpio_flags *of_flags)
{
struct gpio_desc *desc;
if (!IS_ENABLED(CONFIG_LEDS_TRIGGER_GPIO))
return ERR_PTR(-ENOENT);
if (!con_id || strcmp(con_id, "trigger-sources"))
return ERR_PTR(-ENOENT);
desc = of_get_named_gpiod_flags(np, con_id, idx, of_flags);
if (!gpiod_not_found(desc))
pr_debug("%s is used as a trigger\n", of_node_full_name(np));
return desc;
}
typedef struct gpio_desc *(*of_find_gpio_quirk)(struct device_node *np,
const char *con_id,
unsigned int idx,
@ -627,6 +654,7 @@ typedef struct gpio_desc *(*of_find_gpio_quirk)(struct device_node *np,
static const of_find_gpio_quirk of_find_gpio_quirks[] = {
of_find_gpio_rename,
of_find_mt2701_gpio,
of_find_trigger_gpio,
NULL
};