| * 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. | |
| Optional 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. | |
| If this property is not specified, <0 0> is assumed. | |
| - 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 | |
| }; | |