1* GPIO-controlled Watchdog
2
3Required Properties:
4- compatible: Should contain "linux,wdt-gpio".
5- gpios: From common gpio binding; gpio connection to WDT reset pin.
6- hw_algo: The algorithm used by the driver. Should be one of the
7  following values:
8  - toggle: Either a high-to-low or a low-to-high transition clears
9    the WDT counter. The watchdog timer is disabled when GPIO is
10    left floating or connected to a three-state buffer.
11  - level: Low or high level starts counting WDT timeout,
12    the opposite level disables the WDT. Active level is determined
13    by the GPIO flags.
14- hw_margin_ms: Maximum time to reset watchdog circuit (milliseconds).
15
16Optional Properties:
17- always-running: If the watchdog timer cannot be disabled, add this flag to
18  have the driver keep toggling the signal without a client. It will only cease
19  to toggle the signal when the device is open and the timeout elapsed.
20
21Example:
22	watchdog: watchdog {
23		/* ADM706 */
24		compatible = "linux,wdt-gpio";
25		gpios = <&gpio3 9 GPIO_ACTIVE_LOW>;
26		hw_algo = "toggle";
27		hw_margin_ms = <1600>;
28	};
29