1* RS485 serial communications
2
3The RTS signal is capable of automatically controlling line direction for
4the built-in half-duplex mode.
5The properties described hereafter shall be given to a half-duplex capable
6UART node.
7
8Required properties:
9- rs485-rts-delay: prop-encoded-array <a b> where:
10  * a is the delay between rts signal and beginning of data sent in milliseconds.
11      it corresponds to the delay before sending data.
12  * b is the delay between end of data sent and rts signal in milliseconds
13      it corresponds to the delay after sending data and actual release of the line.
14
15Optional properties:
16- linux,rs485-enabled-at-boot-time: empty property telling to enable the rs485
17  feature at boot time. It can be disabled later with proper ioctl.
18- rs485-rx-during-tx: empty property that enables the receiving of data even
19  whilst sending data.
20
21RS485 example for Atmel USART:
22	usart0: serial@fff8c000 {
23		compatible = "atmel,at91sam9260-usart";
24		reg = <0xfff8c000 0x4000>;
25		interrupts = <7>;
26		atmel,use-dma-rx;
27		atmel,use-dma-tx;
28		linux,rs485-enabled-at-boot-time;
29		rs485-rts-delay = <0 200>;		// in milliseconds
30	};
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32