arch/x86/dts/serial.dtsi

   1 / {
   2         serial: serial {
   3                 u-boot,dm-pre-reloc;
   4                 compatible = "ns16550";
   5                 reg = <0x3f8 8>;
   6                 reg-shift = <0>;
   7                 clock-frequency = <1843200>;
   8                 current-speed = <115200>;
   9         };
  10 };