projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 440b075b | 1 | # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| f8ae9bb5 DH |
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 | ||
| 7 | title: GPIO controlled power off | |
| 8 | ||
| 9 | maintainers: | |
| 10 | - Sebastian Reichel <sre@kernel.org> | |
| 11 | ||
| 12 | description: > | |
| 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 | ||
| 21 | properties: | |
| 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 | ||
| 47 | required: | |
| 48 | - compatible | |
| 49 | - gpios | |
| 50 | ||
| 51 | additionalProperties: false | |
| 52 | ||
| 53 | examples: | |
| 54 | - | | |
| 55 | gpio-poweroff { | |
| 56 | compatible = "gpio-poweroff"; | |
| 57 | gpios = <&gpio 4 0>; | |
| 58 | timeout-ms = <3000>; | |
| 59 | }; |