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