1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/power/reset/gpio-poweroff.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: GPIO controlled power off
8
9maintainers:
10  - Sebastian Reichel <sre@kernel.org>
11
12description: >
13  System power off support via a GPIO line. When a shutdown is
14  executed the operating system is expected to switch the GPIO
15  from inactive to active. After a delay (active-delay-ms) it
16  is expected to be switched back to inactive. After another
17  delay (inactive-delay-ms) it is configured as active again.
18  Finally the operating system assumes the power off failed if
19  the system is still running after waiting some time (timeout-ms).
20
21properties:
22  compatible:
23    const: gpio-poweroff
24
25  gpios:
26    maxItems: 1
27
28  input:
29    type: boolean
30    description: >
31      Initially configure the GPIO line as an input. Only reconfigure
32      it to an output when the power-off sequence is initiated. If this optional
33      property is not specified, the GPIO is initialized as an output in its inactive state.
34
35  active-delay-ms:
36    default: 100
37    description: Delay to wait after driving gpio active
38
39  inactive-delay-ms:
40    default: 100
41    description: Delay to wait after driving gpio inactive
42
43  timeout-ms:
44    default: 3000
45    description: Time to wait before assuming the power off sequence failed.
46
47required:
48  - compatible
49  - gpios
50
51additionalProperties: false
52
53examples:
54  - |
55    gpio-poweroff {
56        compatible = "gpio-poweroff";
57        gpios = <&gpio 4 0>;
58        timeout-ms = <3000>;
59    };
60