[PATCH 1/3] dt-bindings: document the CEC GPIO bindings

[Hans Verkuil]

From: Hans Verkuil <hans.verkuil at cisco.com>

Document the bindings for the cec-gpio module for hardware where the
CEC pin is connected to a GPIO pin.

Signed-off-by: Hans Verkuil <hans.verkuil at cisco.com>
---
 Documentation/devicetree/bindings/media/cec-gpio.txt | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/cec-gpio.txt

diff --git a/Documentation/devicetree/bindings/media/cec-gpio.txt b/Documentation/devicetree/bindings/media/cec-gpio.txt
new file mode 100644
index 000000000000..58fa56080cda
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/cec-gpio.txt
@@ -0,0 +1,18 @@
+* HDMI CEC GPIO driver
+
+The HDMI CEC GPIO module supports CEC implementations where the CEC pin
+is hooked up to a pull-up GPIO pin.
+
+The CEC GPIO
+
+Required properties:
+  - compatible: value must be "cec-gpio"
+  - gpio: gpio that the CEC line is connected to
+
+Example for the Raspberry Pi 3 where the CEC line is connected to
+pin 7 aka BCM4 aka GPCLK0 on the GPIO pin header:
+
+cec-gpio {
+       compatible = "cec-gpio";
+       gpio = <&gpio 4 GPIO_ACTIVE_HIGH>;
+};
-- 
2.13.2