1 # SPDX-License-Identifier: (GPL-2.0-only OR BS
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/power/reset
5 $schema: http://devicetree.org/meta-schemas/co
6
7 title: GPIO controlled reset
8
9 maintainers:
10 - Sebastian Reichel <sre@kernel.org>
11
12 description: >
13 Drive a GPIO line that can be used to restar
14
15 This binding supports level and edge trigger
16 request the given gpio line and install a re
17 'open-source' is not found, the GPIO line wi
18 not driven until the restart is initiated.
19
20 When the system is restarted, the restart ha
21 is configured as an output, and driven activ
22 This will also cause an inactive->active edg
23 reset. After a delay specified by active-del
24 active->inactive edge, triggering negative e
25 inactive-delay, the GPIO is driven active ag
26 restart handler completes allowing other res
27
28 allOf:
29 - $ref: restart-handler.yaml#
30
31 properties:
32 compatible:
33 const: gpio-restart
34
35 gpios:
36 description: The GPIO to set high/low, see
37 Documentation/devicetree/bindings/gpio/g
38 set it to "Active Low", otherwise set GP
39
40 open-source:
41 $ref: /schemas/types.yaml#/definitions/fla
42 description: Treat the GPIO as being open
43 initiated. If this optional property is
44 in its inactive state.
45
46 priority:
47 default: 129
48
49 active-delay:
50 $ref: /schemas/types.yaml#/definitions/uin
51 description: Delay (default 100) to wait a
52 default: 100
53
54 inactive-delay:
55 $ref: /schemas/types.yaml#/definitions/uin
56 description: Delay (default 100) to wait a
57 default: 100
58
59 wait-delay:
60 $ref: /schemas/types.yaml#/definitions/uin
61 description: Delay (default 3000) to wait
62 default: 100
63
64 additionalProperties: false
65
66 required:
67 - compatible
68 - gpios
69
70 examples:
71 - |
72 gpio-restart {
73 compatible = "gpio-restart";
74 gpios = <&gpio 4 0>;
75 priority = <128>;
76 active-delay = <100>;
77 inactive-delay = <100>;
78 wait-delay = <3000>;
79 };
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