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,rng,dcd}-gpios: specify a GPIO for DTR/DSR/RI/DCD line respectively. Example: serial@b00260000 { compatible = "axis,etraxfs-uart"; reg = <0xb0026000 0x1000>; interrupts = <68>; dtr-gpios = <&sysgpio 0 GPIO_ACTIVE_LOW>; dsr-gpios = <&sysgpio 1 GPIO_ACTIVE_LOW>; rng-gpios = <&sysgpio 2 GPIO_ACTIVE_LOW>; dcd-gpios = <&sysgpio 3 GPIO_ACTIVE_LOW>; };