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@xxxxxxxxxx>
---
drivers/gpio/gpiolib-of.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 531faabead0f..f4a660bf11fd 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -611,6 +611,33 @@ 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,
@@ -618,6 +645,7 @@ 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
};
--
2.34.1
