keys{

        compatible = "gpio-keys";

        #address-cells = <1>;

        #size-cells = <0>;

        autorepeat;

        keypad-01{

            label = "keypad-01";

            gpios = <&gpio4 30 1>;

            linux,code = <2>; /* KEY_RESERVED  */

        };

        keypad-02{

            label = "keypad-02";

            gpios = <&gpio4 31 1>;

            linux,code = <3>; /* KEY_RESERVED  */

        };

};