GPIO看门狗

&iomuxc {
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_hog_1>;
        imx6ul-evk {
                pinctrl_hog_1: hoggrp-1 {
                        fsl,pins = <
                                MX6UL_PAD_SNVS_TAMPER7__GPIO5_IO07     0x1b0b0 /* Watchdog WDI */
                        >;
                };
        };
};


watchdog: watchdog {
        compatible = "linux,wdt-gpio";
        gpios = <&gpio5 7 GPIO_ACTIVE_LOW>;
        hw_algo = "toggle";
        hw_margin_ms = <200>;
};