linux/Documentation/devicetree/bindings/serial/pl011.txt
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   1* ARM AMBA Primecell PL011 serial UART
   2
   3Required properties:
   4- compatible: must be "arm,primecell", "arm,pl011"
   5- reg: exactly one register range with length 0x1000
   6- interrupts: exactly one interrupt specifier
   7
   8Optional properties:
   9- pinctrl: When present, must have one state named "sleep"
  10           and one state named "default"
  11- clocks:  When present, must refer to exactly one clock named
  12           "apb_pclk"
  13- dmas:    When present, may have one or two dma channels.
  14           The first one must be named "rx", the second one
  15           must be named "tx".
  16
  17See also bindings/arm/primecell.txt
  18