* GPIO-controlled Watchdog Required Properties: - compatible: Should contain "linux,wdt-gpio". - gpios: From common gpio binding; gpio connection to WDT reset pin. - hw_algo: The algorithm used by the driver. Should be one of the following values: - toggle: 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. - level: Low or high level starts counting WDT timeout, the opposite level disables the WDT. Active level is determined by the GPIO flags. - hw_margin_ms: Maximum time to reset watchdog circuit (milliseconds). Optional Properties: - always-running: 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. Example: watchdog: watchdog { /* ADM706 */ compatible = "linux,wdt-gpio"; gpios = <&gpio3 9 GPIO_ACTIVE_LOW>; hw_algo = "toggle"; hw_margin_ms = <1600>; };