devicetree: bindings: gpio-davinic: fix documentation

This patch adds missing #gpio-cells and also adds a
usage example for leds.

Reported-by: Alexander Holler <holler@ahsoftware.de>
Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/gpio/gpio-davinci.txt b/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
index 4ce9862308ad..5079ba7d6568 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
@@ -8,6 +8,10 @@ Required Properties:
 
 - gpio-controller : Marks the device node as a gpio controller.
 
+- #gpio-cells : Should be two.
+  - first cell is the pin number
+  - second cell is used to specify optional parameters (unused)
+
 - interrupt-parent: phandle of the parent interrupt controller.
 
 - interrupts: Array of GPIO interrupt number. Only banked or unbanked IRQs are
@@ -27,6 +31,7 @@ Example:
 gpio: gpio@1e26000 {
         compatible = "ti,dm6441-gpio";
         gpio-controller;
+        #gpio-cells = <2>;
         reg = <0x226000 0x1000>;
         interrupt-parent = <&intc>;
         interrupts = <42 IRQ_TYPE_EDGE_BOTH 43 IRQ_TYPE_EDGE_BOTH
@@ -39,3 +44,19 @@ gpio: gpio@1e26000 {
         interrupt-controller;
         #interrupt-cells = <2>;
 };
+
+leds {
+        compatible = "gpio-leds";
+
+        led1 {
+                label = "davinci:green:usr1";
+                gpios = <&gpio 10 GPIO_ACTIVE_HIGH>;
+                ...
+        };
+
+        led2 {
+                label = "davinci:red:debug1";
+                gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
+                ...
+        };
+};