linux/Documentation/devicetree/bindings/tty/serial/atmel-usart.txt
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   1* Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART)
   2
   3Required properties:
   4- compatible: Should be "atmel,<chip>-usart"
   5  The compatible <chip> indicated will be the first SoC to support an
   6  additional mode or an USART new feature.
   7- reg: Should contain registers location and length
   8- interrupts: Should contain interrupt
   9
  10Optional properties:
  11- atmel,use-dma-rx: use of PDC or DMA for receiving data
  12- atmel,use-dma-tx: use of PDC or DMA for transmitting data
  13
  14<chip> compatible description:
  15- at91rm9200:  legacy USART support
  16- at91sam9260: generic USART implementation for SAM9 SoCs
  17
  18Example:
  19
  20        usart0: serial@fff8c000 {
  21                compatible = "atmel,at91sam9260-usart";
  22                reg = <0xfff8c000 0x4000>;
  23                interrupts = <7>;
  24                atmel,use-dma-rx;
  25                atmel,use-dma-tx;
  26        };
  27
  28