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# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/media/cec/cec-gpio.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: HDMI CEC GPIO
maintainers:
- Hans Verkuil <hverkuil-cisco@xs4all.nl>
description: |
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.
properties:
compatible:
const: cec-gpio
cec-gpios:
maxItems: 1
description:
GPIO that the CEC line is connected to. The line should be tagged as open
drain.
hpd-gpios:
maxItems: 1
description:
GPIO that the HPD line is connected to. Used for debugging HPD changes
when the CEC line is not associated with an HDMI receiver/transmitter.
v5-gpios:
maxItems: 1
description:
GPIO that the 5V line is connected to. Used for debugging changes on the
5V line.
required:
- compatible
- cec-gpios
allOf:
- $ref: cec-common.yaml#
- if:
required:
- hdmi-phandle
then:
properties:
hpd-gpios: false
- if:
required:
- hpd-gpios
then:
properties:
hdmi-phandle: false
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
cec {
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>;
};
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