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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>;
};
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