Waveshare watchdog hat configuration

rtc-watchdog-hat.org

Waveshare RTC WatchDog HAT configuration

https://www.waveshare.com/rtc-watchdog-hat.htm

watchdog-device = /dev/watchdog1
interval = 30

/dts-v1/;
/plugin/;

/ {
    compatible = "brcm,bcm2708";
    fragment@0 {
        target  = <&soc>;
        __overlay__ {
             gpio_watchdog {
                  compatible = "linux,wdt-gpio";
                  gpios = <&gpio 4 0>;
                  hw_algo = "toggle";
                  hw_margin_ms = <1000>;
             };
        };
    };
};

dtc -@ -I dts -O dtb -o max705-wdt.dtbo max705-wdt.dts
cp max-705-wdt.dtbo /boot/overlays/