正点原子例程，为什么这里key节点下面没有子节点还是有#address-cells = <1>;#size-cells = <1>;这两个，不太明白
key {
#address-cells = <1>;
#size-cells = <1>;
compatible = "atkalpha-key";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_key>;
key-gpio = <&gpio1 18 GPIO_ACTIVE_LOW>; /* KEY0 */
interrupt-parent = <&gpio1>;
interrupts = <18 IRQ_TYPE_EDGE_BOTH>; /* FALLING RISING */
status = "okay";
};