* Freescale i.MX Universal Asynchronous Receiver/Transmitter (UART) Required properties: - compatible : Should be "fsl,-uart" - reg : Address and length of the register set for the device - interrupts : Should contain uart interrupt Optional properties: - fsl,dte-mode : Indicate the uart works in DTE mode. The uart works in DCE mode by default. - rs485-rts-delay, rs485-rts-active-low, rs485-rx-during-tx, linux,rs485-enabled-at-boot-time: see rs485.txt. Note that for RS485 you must enable either the "uart-has-rtscts" or the "rts-gpios" properties. In case you use "uart-has-rtscts" the signal that controls the transceiver is actually CTS_B, not RTS_B. CTS_B is always output, and RTS_B is input, regardless of dte-mode. Please check Documentation/devicetree/bindings/serial/serial.txt for the complete list of generic properties. Note: Each uart controller should have an alias correctly numbered in "aliases" node. Example: aliases { serial0 = &uart1; }; uart1: serial@73fbc000 { compatible = "fsl,imx51-uart", "fsl,imx21-uart"; reg = <0x73fbc000 0x4000>; interrupts = <31>; uart-has-rtscts; fsl,dte-mode; };