1 * UART (Universal Asynchronous Receiver/Transmitter)
11 - "nvidia,tegra20-uart"
12 - "ibm,qpace-nwp-serial"
15 - "altr,16550-FIFO128"
16 - "serial" if the port type is unknown.
17 - reg : offset and length of the register set for the device.
18 - interrupts : should contain uart interrupt.
19 - clock-frequency : the input clock frequency for the UART.
22 - current-speed : the current active speed of the UART.
23 - reg-offset : offset to apply to the mapbase from the start of the registers.
24 - reg-shift : quantity to shift the register offsets by.
25 - reg-io-width : the size (in bytes) of the IO accesses that should be
26 performed on the device. There are some systems that require 32-bit
27 accesses to the UART (e.g. TI davinci).
28 - used-by-rtas : set to indicate that the port is in use by the OpenFirmware
29 RTAS and should not be registered.
34 compatible = "ns8250";
35 reg = <0x80230000 0x100>;
36 clock-frequency = <3686400>;