Hi Free Samples,
Required:
- 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:
- 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 {
compatible = "linux,wdt-gpio";
gpios = <&gpio3 9 GPIO_ACTIVE_LOW>;
hw_algo = "toggle";
hw_margin_ms = <1600>;
};
For the driver you can take a look to following reference:
Linux/drivers/watchdog/gpio_wdt.c - Linux Cross Reference - Free Electrons
Regards,
Carlos
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