[PATCH] gpio/tegra: dt: add binding for gpio polarity

[Olof Johansson]

Allocate one bit in the available extra cell to indicate if the gpio
should be considered logically inverted.

Signed-off-by: Olof Johansson <olof at lixom.net>
---
 .../devicetree/bindings/gpio/gpio_nvidia.txt       |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/Documentation/devicetree/bindings/gpio/gpio_nvidia.txt b/Documentation/devicetree/bindings/gpio/gpio_nvidia.txt
index 64aac39..adcf55c 100644
--- a/Documentation/devicetree/bindings/gpio/gpio_nvidia.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio_nvidia.txt
@@ -3,5 +3,6 @@ NVIDIA Tegra 2 GPIO controller
 Required properties:
 - compatible : "nvidia,tegra20-gpio"
 - #gpio-cells : Should be two. The first cell is the pin number and the
-  second cell is used to specify optional parameters (currently unused).
+  second cell is used to specify optional parameters:
+  - bit 0 specifies polarity (0 for normal, 1 for inverted)
 - gpio-controller : Marks the device node as a GPIO controller.
-- 
1.7.4.1