[PATCH v4 3/4] leds: led-class: Add devicetree support to led_get()
From: Aleksandrs Vinarskis <hidden>
Date: 2025-09-10 11:08:09
Also in:
dri-devel, linux-arm-msm, linux-leds, linux-media, lkml
Subsystem:
led subsystem, the rest · Maintainers:
Lee Jones, Pavel Machek, Linus Torvalds
From: Hans de Goede <hansg@kernel.org> Add 'name' argument to of_led_get() such that it can lookup LEDs in devicetree by either name or index. And use this modified function to add devicetree support to the generic (non devicetree specific) [devm_]led_get() function. This uses the standard devicetree pattern of adding a -names string array to map names to the indexes for an array of resources. Reviewed-by: Andy Shevchenko <redacted> Reviewed-by: Lee Jones <lee@kernel.org> Reviewed-by: Linus Walleij <redacted> Signed-off-by: Hans de Goede <hansg@kernel.org> Signed-off-by: Aleksandrs Vinarskis <redacted> --- drivers/leds/led-class.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 15633fbf3c166aa4f521774d245f6399a642bced..f3faf37f9a08ac762ed87b91cb3cab5faa8eacb0 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c@@ -252,15 +252,23 @@ static const struct class leds_class = { * of_led_get() - request a LED device via the LED framework * @np: device node to get the LED device from * @index: the index of the LED + * @name: the name of the LED used to map it to its function, if present * * Returns the LED device parsed from the phandle specified in the "leds" * property of a device tree node or a negative error-code on failure. */ -static struct led_classdev *of_led_get(struct device_node *np, int index) +static struct led_classdev *of_led_get(struct device_node *np, int index, + const char *name) { struct device *led_dev; struct device_node *led_node; + /* + * For named LEDs, first look up the name in the "led-names" property. + * If it cannot be found, then of_parse_phandle() will propagate the error. + */ + if (name) + index = of_property_match_string(np, "led-names", name); led_node = of_parse_phandle(np, "leds", index); if (!led_node) return ERR_PTR(-ENOENT);
@@ -324,7 +332,7 @@ struct led_classdev *__must_check devm_of_led_get(struct device *dev, if (!dev) return ERR_PTR(-EINVAL); - led = of_led_get(dev->of_node, index); + led = of_led_get(dev->of_node, index, NULL); if (IS_ERR(led)) return led;
@@ -342,9 +350,14 @@ EXPORT_SYMBOL_GPL(devm_of_led_get); struct led_classdev *led_get(struct device *dev, char *con_id) { struct led_lookup_data *lookup; + struct led_classdev *led_cdev; const char *provider = NULL; struct device *led_dev; + led_cdev = of_led_get(dev->of_node, -1, con_id); + if (!IS_ERR(led_cdev) || PTR_ERR(led_cdev) != -ENOENT) + return led_cdev; + mutex_lock(&leds_lookup_lock); list_for_each_entry(lookup, &leds_lookup_list, list) { if (!strcmp(lookup->dev_id, dev_name(dev)) &&
--
2.48.1