* RS485 serial communications The RTS signal is capable of automatically controlling line direction for the built-in half-duplex mode. The properties described hereafter shall be given to a half-duplex capable UART node. Required properties: - rs485-rts-delay: prop-encoded-array <a b> where: * a is the delay between rts signal and beginning of data sent in milliseconds. it corresponds to the delay before sending data. * b is the delay between end of data sent and rts signal in milliseconds it corresponds to the delay after sending data and actual release of the line. Optional properties: - linux,rs485-enabled-at-boot-time: empty property telling to enable the rs485 feature at boot time. It can be disabled later with proper ioctl. - rs485-rx-during-tx: empty property that enables the receiving of data even whilst sending data. RS485 example for Atmel USART: usart0: serial@fff8c000 { compatible = "atmel,at91sam9260-usart"; reg = <0xfff8c000 0x4000>; interrupts = <7>; atmel,use-dma-rx; atmel,use-dma-tx; linux,rs485-enabled-at-boot-time; rs485-rts-delay = <0 200>; // in milliseconds };