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

[Hans de Goede <hdegoede@redhat.com>]

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(-)

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);
 
 /**
-- 
2.38.1