4 - compatible : "axis,etraxfs-uart"
5 - reg: offset and length of the register set for the device.
6 - interrupts: device interrupt
9 - {dtr,dsr,rng,dcd}-gpios: specify a GPIO for DTR/DSR/RI/DCD
15 compatible = "axis,etraxfs-uart";
16 reg = <0xb0026000 0x1000>;
19 dtr-gpios = <&sysgpio 0 GPIO_ACTIVE_LOW>;
20 dsr-gpios = <&sysgpio 1 GPIO_ACTIVE_LOW>;
21 rng-gpios = <&sysgpio 2 GPIO_ACTIVE_LOW>;
22 dcd-gpios = <&sysgpio 3 GPIO_ACTIVE_LOW>;