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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.
-
-Please note: the maximum voltage for the CEC line is 3.63V, for the HPD and
-5V lines it is 5.3V. So you may need some sort of level conversion circuitry
-when connecting them to a 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 and can be used for debugging HPD changes:
-
- - hpd-gpios: gpio that the HPD line is connected to.
-
-This property is optional and can be used for debugging changes on the 5V line:
-
- - v5-gpios: gpio that the 5V 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, the HPD line is
-connected to pin 11 aka BCM17 and the 5V line is connected to pin
-15 aka BCM22 (some level shifter is needed for the HPD and 5V lines!):
-
-#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>;
- v5-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
-};