| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/media/cec/cec-gpio.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: HDMI CEC GPIO |
| 8 | |
| 9 | maintainers: |
| 10 | - Hans Verkuil <hverkuil-cisco@xs4all.nl> |
| 11 | |
| 12 | description: | |
| 13 | The HDMI CEC GPIO module supports CEC implementations where the CEC line is |
| 14 | hooked up to a pull-up GPIO line and - optionally - the HPD line is hooked up |
| 15 | to another GPIO line. |
| 16 | |
| 17 | Please note:: the maximum voltage for the CEC line is 3.63V, for the HPD and |
| 18 | 5V lines it is 5.3V. So you may need some sort of level conversion |
| 19 | circuitry when connecting them to a GPIO line. |
| 20 | |
| 21 | properties: |
| 22 | compatible: |
| 23 | const: cec-gpio |
| 24 | |
| 25 | cec-gpios: |
| 26 | maxItems: 1 |
| 27 | description: |
| 28 | GPIO that the CEC line is connected to. The line should be tagged as open |
| 29 | drain. |
| 30 | |
| 31 | hpd-gpios: |
| 32 | maxItems: 1 |
| 33 | description: |
| 34 | GPIO that the HPD line is connected to. Used for debugging HPD changes |
| 35 | when the CEC line is not associated with an HDMI receiver/transmitter. |
| 36 | |
| 37 | v5-gpios: |
| 38 | maxItems: 1 |
| 39 | description: |
| 40 | GPIO that the 5V line is connected to. Used for debugging changes on the |
| 41 | 5V line. |
| 42 | |
| 43 | required: |
| 44 | - compatible |
| 45 | - cec-gpios |
| 46 | |
| 47 | allOf: |
| 48 | - $ref: cec-common.yaml# |
| 49 | - if: |
| 50 | required: |
| 51 | - hdmi-phandle |
| 52 | then: |
| 53 | properties: |
| 54 | hpd-gpios: false |
| 55 | |
| 56 | - if: |
| 57 | required: |
| 58 | - hpd-gpios |
| 59 | then: |
| 60 | properties: |
| 61 | hdmi-phandle: false |
| 62 | |
| 63 | unevaluatedProperties: false |
| 64 | |
| 65 | examples: |
| 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 | }; |