| 12345678910111213141516171819202122232425262728293031323334353637383940 |
- * UART (Universal Asynchronous Receiver/Transmitter)
- Required properties:
- - compatible : one of:
- - "ns8250"
- - "ns16450"
- - "ns16550a"
- - "ns16550"
- - "ns16750"
- - "ns16850"
- - "nvidia,tegra20-uart"
- - "ibm,qpace-nwp-serial"
- - "altr,16550-FIFO32"
- - "altr,16550-FIFO64"
- - "altr,16550-FIFO128"
- - "serial" if the port type is unknown.
- - reg : offset and length of the register set for the device.
- - interrupts : should contain uart interrupt.
- - clock-frequency : the input clock frequency for the UART.
- Optional properties:
- - current-speed : the current active speed of the UART.
- - reg-offset : offset to apply to the mapbase from the start of the registers.
- - reg-shift : quantity to shift the register offsets by.
- - reg-io-width : the size (in bytes) of the IO accesses that should be
- performed on the device. There are some systems that require 32-bit
- accesses to the UART (e.g. TI davinci).
- - used-by-rtas : set to indicate that the port is in use by the OpenFirmware
- RTAS and should not be registered.
- Example:
- uart@80230000 {
- compatible = "ns8250";
- reg = <0x80230000 0x100>;
- clock-frequency = <3686400>;
- interrupts = <10>;
- reg-shift = <2>;
- };
|
