/ { aliases { modem = &modem; }; }; &uart1 { compatible = "nordic,nrf-uarte"; current-speed = <115200>; hw-flow-control; status = "okay"; pinctrl-0 = <&uart1_default_alt>; modem: modem { compatible = "nordic,nrf91-slm"; status = "okay"; mdm-power-gpios = <&gpio0 20 GPIO_ACTIVE_LOW>; }; }; &pinctrl { uart1_default_alt: uart1_default_alt { group1 { psels = ; bias-pull-up; }; group2 { psels = , , ; }; }; };