Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
69 lines
1.7 KiB
YAML
69 lines
1.7 KiB
YAML
# 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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$id: http://devicetree.org/schemas/watchdog/linux,wdt-gpio.yaml#
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$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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- Guenter Roeck <linux@roeck-us.net>
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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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description: gpio connection to WDT reset pin
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maxItems: 1
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hw_algo:
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description: The 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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description: Maximum time to reset watchdog circuit (milliseconds).
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$ref: /schemas/types.yaml#/definitions/uint32
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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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allOf:
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- $ref: watchdog.yaml#
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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watchdog {
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compatible = "linux,wdt-gpio";
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gpios = <&gpio3 9 GPIO_ACTIVE_LOW>;
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hw_algo = "toggle";
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hw_margin_ms = <1600>;
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};
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