From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Document the bindings for the cec-gpio module for hardware where the
CEC pin and optionally the HPD pin are connected to GPIO pins.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
.../devicetree/bindings/media/cec-gpio.txt | 22 ++++++++++++++++++++++
1 file changed, 22 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..d1df742af0ac
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/cec-gpio.txt
@@ -0,0 +1,22 @@
+* 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 and - optionally - the HPD pin is
+hooked up to a pull-down GPIO pin.
+
+Required properties:
+ - compatible: value must be "cec-gpio"
+ - cec-gpio: gpio that the CEC line is connected to
+
+Optional property:
+ - hpd-gpio: gpio that the HPD line is connected to
+
+Example for the Raspberry Pi 3 where the CEC line is connected to
+pin 26 aka BCM7 aka CE1 on the GPIO pin header and the HPD line is
+connected to pin 11 aka BCM17:
+
+cec-gpio@7 {
+ compatible = "cec-gpio";
+ cec-gpio = <&gpio 7 GPIO_ACTIVE_HIGH>;
+ hpd-gpio = <&gpio 17 GPIO_ACTIVE_HIGH>;
+};
--
2.14.1
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