linux/Documentation/devicetree/bindings/tty/serial/arc-uart.txt
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   1* Synopsys ARC UART : Non standard UART used in some of the ARC FPGA boards
   2
   3Required properties:
   4- compatible            : "snps,arc-uart"
   5- reg                   : offset and length of the register set for the device.
   6- interrupts            : device interrupt
   7- clock-frequency       : the input clock frequency for the UART
   8- current-speed         : baud rate for UART
   9
  10e.g.
  11
  12arcuart0: serial@c0fc1000 {
  13        compatible = "snps,arc-uart";
  14        reg = <0xc0fc1000 0x100>;
  15        interrupts = <5>;
  16        clock-frequency = <80000000>;
  17        current-speed = <115200>;
  18        status = "okay";
  19};
  20
  21Note: Each port should have an alias correctly numbered in "aliases" node.
  22
  23e.g.
  24aliases {
  25        serial0 = &arcuart0;
  26};
  27