diff mbox series

[v3,03/11] leds: led-class: Add __of_led_get() helper

Message ID 20221216113013.126881-4-hdegoede@redhat.com
State New
Headers show
Series leds: lookup-table support + int3472/media privacy LED support | expand

Commit Message

Hans de Goede Dec. 16, 2022, 11:30 a.m. UTC 
Turn of_led_get() into a more generic __of_led_get() helper function,
which can lookup LEDs in devicetree by either name or index.

This is a preparation patch for adding a generic (non devicetree specific)
led_get() function.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/leds/led-class.c | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

Comments

Andy Shevchenko Dec. 16, 2022, 1:50 p.m. UTC | #1 
On Fri, Dec 16, 2022 at 12:30:05PM +0100, Hans de Goede wrote:
> Turn of_led_get() into a more generic __of_led_get() helper function,
> which can lookup LEDs in devicetree by either name or index.

...

> +	/*
> +	 * For named LEDs, first look up the name in the "leds-names" property.
> +	 * If it cannot be found, then of_parse_phandle() will propagate the error.
> +	 */
> +	if (name)
> +		index = of_property_match_string(np, "leds-names", name);

I can't find this property anywhere in the kernel. Is it new?
If so, where is the bindings? And why entire code can't be converted
to use fwnode for this case?
diff mbox series

Patch

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 5f40110bd260..1dd421ca56c1 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -232,19 +232,18 @@  static struct led_classdev *__led_get(struct device *led_dev)
 	return led_cdev;
 }
 
-/**
- * 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
- *
- * 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.
- */
-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 "leds-names" property.
+	 * If it cannot be found, then of_parse_phandle() will propagate the error.
+	 */
+	if (name)
+		index = of_property_match_string(np, "leds-names", name);
 	led_node = of_parse_phandle(np, "leds", index);
 	if (!led_node)
 		return ERR_PTR(-ENOENT);
@@ -254,6 +253,19 @@  struct led_classdev *of_led_get(struct device_node *np, int index)
 
 	return __led_get(led_dev);
 }
+
+/**
+ * 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
+ *
+ * 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.
+ */
+struct led_classdev *of_led_get(struct device_node *np, int index)
+{
+	return __of_led_get(np, index, NULL);
+}
 EXPORT_SYMBOL_GPL(of_led_get);
 
 /**