dt-bindings: leds: document Panasonic AN30259A bindings

Signed-off-by: Simon Shields <simon@lineageos.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>

diff --git a/Documentation/devicetree/bindings/leds/leds-an30259a.txt b/Documentation/devicetree/bindings/leds/leds-an30259a.txt
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+* Panasonic AN30259A 3-channel LED driver
+
+The AN30259A is a LED controller capable of driving three LEDs independently. It supports
+constant current output and sloping current output modes. The chip is connected over I2C.
+
+Required properties:
+       - compatible: Must be "panasonic,an30259a".
+       - reg: I2C slave address.
+       - #address-cells: Must be 1.
+       - #size-cells: Must be 0.
+
+Each LED is represented as a sub-node of the panasonic,an30259a node.
+
+Required sub-node properties:
+       - reg: Pin that the LED is connected to. Must be 1, 2, or 3.
+
+Optional sub-node properties:
+       - label: see Documentation/devicetree/bindings/leds/common.txt
+       - linux,default-trigger: see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+led-controller@30 {
+       compatible = "panasonic,an30259a";
+       reg = <0x30>;
+       #address-cells = <1>;
+       #size-cells = <0>;
+
+       led@1 {
+               reg = <1>;
+               linux,default-trigger = "heartbeat";
+               label = "red:indicator";
+       };
+
+       led@2 {
+               reg = <2>;
+               label = "green:indicator";
+       };
+
+       led@3 {
+               reg = <3>;
+               label = "blue:indicator";
+       };
+};