linux/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt
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   1* Freescale i.MX Universal Asynchronous Receiver/Transmitter (UART)
   2
   3Required properties:
   4- compatible : Should be "fsl,<soc>-uart"
   5- reg : Address and length of the register set for the device
   6- interrupts : Should contain uart interrupt
   7
   8Optional properties:
   9- fsl,uart-has-rtscts : Indicate the uart has rts and cts
  10- fsl,irda-mode : Indicate the uart supports irda mode
  11
  12Example:
  13
  14serial@73fbc000 {
  15        compatible = "fsl,imx51-uart", "fsl,imx21-uart";
  16        reg = <0x73fbc000 0x4000>;
  17        interrupts = <31>;
  18        fsl,uart-has-rtscts;
  19};
  20