linux/Documentation/devicetree/bindings/tty/serial/efm32-uart.txt
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   1* Energymicro efm32 UART
   2
   3Required properties:
   4- compatible : Should be "efm32,uart"
   5- reg : Address and length of the register set
   6- interrupts : Should contain uart interrupt
   7
   8Optional properties:
   9- location : Decides the location of the USART I/O pins.
  10  Allowed range : [0 .. 5]
  11  Default: 0
  12
  13Example:
  14
  15uart@0x4000c400 {
  16        compatible = "efm32,uart";
  17        reg = <0x4000c400 0x400>;
  18        interrupts = <15>;
  19        location = <0>;
  20};
  21