From: Hans Verkuil hans.verkuil@cisco.com
Document the bindings for the cec-gpio module for hardware where the CEC line and optionally the HPD line are connected to GPIO lines.
Signed-off-by: Hans Verkuil hans.verkuil@cisco.com Reviewed-by: Linus Walleij linus.walleij@linaro.org --- .../devicetree/bindings/media/cec-gpio.txt | 32 ++++++++++++++++++++++ 1 file changed, 32 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..46a0bac8b3b9 --- /dev/null +++ b/Documentation/devicetree/bindings/media/cec-gpio.txt @@ -0,0 +1,32 @@ +* HDMI CEC GPIO driver + +The HDMI CEC GPIO module supports CEC implementations where the CEC line +is hooked up to a pull-up GPIO line and - optionally - the HPD line is +hooked up to another GPIO line. + +Required properties: + - compatible: value must be "cec-gpio". + - cec-gpios: gpio that the CEC line is connected to. The line should be + tagged as open drain. + +If the CEC line is associated with an HDMI receiver/transmitter, then the +following property is also required: + + - hdmi-phandle - phandle to the HDMI controller, see also cec.txt. + +If the CEC line is not associated with an HDMI receiver/transmitter, then +the following property is optional: + + - hpd-gpios: 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: + +#include <dt-bindings/gpio/gpio.h> + +cec-gpio { + compatible = "cec-gpio"; + cec-gpios = <&gpio 7 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>; + hpd-gpios = <&gpio 17 GPIO_ACTIVE_HIGH>; +};