leds/tca6507: DT: Add documentation for tca6507 devicetree bindings.

Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

diff --git a/Documentation/devicetree/bindings/leds/tca6507.txt b/Documentation/devicetree/bindings/leds/tca6507.txt
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+LEDs conected to tca6507
+
+Required properties:
+- compatible : should be : "ti,tca6507".
+
+Each led is represented as a sub-node of the ti,tca6507 device.
+
+LED sub-node properties:
+- label : (optional) see Documentation/devicetree/bindings/leds/common.txt
+- reg : number of LED line (could be from 0 to 6)
+- linux,default-trigger : (optional)
+   see Documentation/devicetree/bindings/leds/common.txt
+
+Examples:
+
+tca6507@45 {
+       compatible = "ti,tca6507";
+       #address-cells = <1>;
+       #size-cells = <0>;
+       reg = <0x45>;
+
+       led0: red-aux@0 {
+               label = "red:aux";
+               reg = <0x0>;
+       };
+
+       led1: green-aux@1 {
+               label = "green:aux";
+               reg = <0x5>;
+               linux,default-trigger = "default-on";
+       };
+};
+