add enable-gpios to describe HWEN pin

Signed-off-by: Andreas Kemnade <andr...@kemnade.info>
---
 .../devicetree/bindings/leds/backlight/lm3630a-backlight.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git 
a/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml 
b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
index dc129d9a329e..a9656d72b668 100644
--- a/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
+++ b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
@@ -29,6 +29,10 @@ properties:
   '#size-cells':
     const: 0
 
+  enable-gpios:
+    description: GPIO to use to enable/disable the backlight (HWEN pin).
+    maxItems: 1
+
 required:
   - compatible
   - reg
-- 
2.20.1

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