1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/watchdog/gpio-wdt.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: GPIO controlled watchdog 8 9maintainers: 10 - Robert Marko <robert.marko@sartura.hr> 11 12properties: 13 compatible: 14 const: linux,wdt-gpio 15 16 gpios: 17 maxItems: 1 18 description: GPIO connected to the WDT reset pin 19 20 hw_algo: 21 $ref: /schemas/types.yaml#/definitions/string 22 description: Algorithm used by the driver 23 oneOf: 24 - description: 25 Either a high-to-low or a low-to-high transition clears the WDT counter. 26 The watchdog timer is disabled when GPIO is left floating or connected 27 to a three-state buffer. 28 const: toggle 29 - description: 30 Low or high level starts counting WDT timeout, the opposite level 31 disables the WDT. 32 Active level is determined by the GPIO flags. 33 const: level 34 35 hw_margin_ms: 36 $ref: /schemas/types.yaml#/definitions/uint32 37 description: Maximum time to reset watchdog circuit (in milliseconds) 38 minimum: 2 39 maximum: 65535 40 41 always-running: 42 type: boolean 43 description: 44 If the watchdog timer cannot be disabled, add this flag to have the driver 45 keep toggling the signal without a client. 46 It will only cease to toggle the signal when the device is open and the 47 timeout elapsed. 48 49required: 50 - compatible 51 - gpios 52 - hw_algo 53 - hw_margin_ms 54 55unevaluatedProperties: false 56