linux/Documentation/devicetree/bindings/tty/serial/snps-dw-apb-uart.txt
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   1* Synopsys DesignWare ABP UART
   2
   3Required properties:
   4- compatible : "snps,dw-apb-uart"
   5- reg : offset and length of the register set for the device.
   6- interrupts : should contain uart interrupt.
   7- clock-frequency : the input clock frequency for the UART.
   8
   9Optional properties:
  10- reg-shift : quantity to shift the register offsets by.  If this property is
  11  not present then the register offsets are not shifted.
  12- reg-io-width : the size (in bytes) of the IO accesses that should be
  13  performed on the device.  If this property is not present then single byte
  14  accesses are used.
  15
  16Example:
  17
  18        uart@80230000 {
  19                compatible = "snps,dw-apb-uart";
  20                reg = <0x80230000 0x100>;
  21                clock-frequency = <3686400>;
  22                interrupts = <10>;
  23                reg-shift = <2>;
  24                reg-io-width = <4>;
  25        };
  26