75 lines
1.7 KiB
YAML
75 lines
1.7 KiB
YAML
# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/media/cec/cec-gpio.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: HDMI CEC GPIO
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maintainers:
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- Hans Verkuil <hverkuil-cisco@xs4all.nl>
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description: |
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The HDMI CEC GPIO module supports CEC implementations where the CEC line is
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hooked up to a pull-up GPIO line and - optionally - the HPD line is hooked up
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to another GPIO line.
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Please note:: the maximum voltage for the CEC line is 3.63V, for the HPD and
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5V lines it is 5.3V. So you may need some sort of level conversion
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circuitry when connecting them to a GPIO line.
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properties:
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compatible:
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const: cec-gpio
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cec-gpios:
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maxItems: 1
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description:
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GPIO that the CEC line is connected to. The line should be tagged as open
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drain.
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hpd-gpios:
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maxItems: 1
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description:
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GPIO that the HPD line is connected to. Used for debugging HPD changes
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when the CEC line is not associated with an HDMI receiver/transmitter.
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v5-gpios:
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maxItems: 1
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description:
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GPIO that the 5V line is connected to. Used for debugging changes on the
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5V line.
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required:
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- compatible
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- cec-gpios
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allOf:
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- $ref: cec-common.yaml#
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- if:
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required:
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- hdmi-phandle
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then:
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properties:
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hpd-gpios: false
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- if:
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required:
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- hpd-gpios
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then:
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properties:
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hdmi-phandle: false
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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cec {
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compatible = "cec-gpio";
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cec-gpios = <&gpio 7 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
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hpd-gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
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v5-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
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};
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