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 };
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