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ETRAX FS UART

Required properties:
- compatible : "axis,etraxfs-uart"
- reg: offset and length of the register set for the device.
- interrupts: device interrupt

Optional properties:
- {dtr,dsr,ri,cd}-gpios: specify a GPIO for DTR/DSR/RI/CD
  line respectively.

Example:

serial@b00260000 {
	compatible = "axis,etraxfs-uart";
	reg = <0xb0026000 0x1000>;
	interrupts = <68>;
	status = "disabled";
};