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1# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause2%YAML 1.23---4$id: http://devicetree.org/schemas/media/cec/cec-gpio.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: HDMI CEC GPIO8 9maintainers:10 - Hans Verkuil <hverkuil-cisco@xs4all.nl>11 12description: |13 The HDMI CEC GPIO module supports CEC implementations where the CEC line is14 hooked up to a pull-up GPIO line and - optionally - the HPD line is hooked up15 to another GPIO line.16 17 Please note:: the maximum voltage for the CEC line is 3.63V, for the HPD and18 5V lines it is 5.3V. So you may need some sort of level conversion19 circuitry when connecting them to a GPIO line.20 21properties:22 compatible:23 const: cec-gpio24 25 cec-gpios:26 maxItems: 127 description:28 GPIO that the CEC line is connected to. The line should be tagged as open29 drain.30 31 hpd-gpios:32 maxItems: 133 description:34 GPIO that the HPD line is connected to. Used for debugging HPD changes35 when the CEC line is not associated with an HDMI receiver/transmitter.36 37 v5-gpios:38 maxItems: 139 description:40 GPIO that the 5V line is connected to. Used for debugging changes on the41 5V line.42 43required:44 - compatible45 - cec-gpios46 47allOf:48 - $ref: cec-common.yaml#49 - if:50 required:51 - hdmi-phandle52 then:53 properties:54 hpd-gpios: false55 56 - if:57 required:58 - hpd-gpios59 then:60 properties:61 hdmi-phandle: false62 63unevaluatedProperties: false64 65examples:66 - |67 #include <dt-bindings/gpio/gpio.h>68 69 cec {70 compatible = "cec-gpio";71 cec-gpios = <&gpio 7 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;72 hpd-gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;73 v5-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;74 };75