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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/watchdog/gpio-wdt.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: GPIO controlled watchdog
maintainers:
- Robert Marko <robert.marko@sartura.hr>
properties:
compatible:
const: linux,wdt-gpio
gpios:
maxItems: 1
description: GPIO connected to the WDT reset pin
hw_algo:
$ref: /schemas/types.yaml#/definitions/string
description: Algorithm used by the driver
oneOf:
- description:
Either a high-to-low or a low-to-high transition clears the WDT counter.
The watchdog timer is disabled when GPIO is left floating or connected
to a three-state buffer.
const: toggle
- description:
Low or high level starts counting WDT timeout, the opposite level
disables the WDT.
Active level is determined by the GPIO flags.
const: level
hw_margin_ms:
$ref: /schemas/types.yaml#/definitions/uint32
description: Maximum time to reset watchdog circuit (in milliseconds)
minimum: 2
maximum: 65535
always-running:
type: boolean
description:
If the watchdog timer cannot be disabled, add this flag to have the driver
keep toggling the signal without a client.
It will only cease to toggle the signal when the device is open and the
timeout elapsed.
required:
- compatible
- gpios
- hw_algo
- hw_margin_ms
unevaluatedProperties: false
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