doc/device-tree-bindings/serial/ns16550.txt

   1 NS16550 UART
   2
   3 This UART driver supports many chip variants and is used in mamy SoCs.
   4
   5 Required properties:
   6 - compatible: "ns16550" or "nvidia,tegra20-uart"
   7 - reg: start address and size of registers
   8 - reg-shift: shift value indicating register size: 0=byte, 1=16bit,2=32bit etc.
   9 - clock-frequency: input clock frequency for the UART (used to calculate the
  10     baud rate divisor)