&pinctrl { uart2_default: uart2_default { group1 { pinmux = ; }; group2 { pinmux = ; bias-pull-up; }; }; }; &uart2 { status = "okay"; current-speed = <57600>; pinctrl-0 = <&uart2_default>; pinctrl-names = "default"; fps { #address-cells=<1>; #size-cells=<0>; grow_r502a@ffffffff { compatible = "hzgrow,r502a"; reg = <0xffffffff>; int-gpios = <&gpio1 3 GPIO_ACTIVE_LOW>; }; }; };