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Commit 67f2a06f authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
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media: dt-bindings: document the CEC GPIO bindings 



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: default avatarHans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 00f7adff

Documentation/devicetree/bindings/media/cec-gpio.txt

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* 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>;

};