| * 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 beteween 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 |
| }; |
| |
