Optional properties:
- dmas: A list of two dma specifiers, one for each entry in dma-names.
- dma-names: should contain "tx" and "rx".
-- rs485-rts-delay, rs485-rx-during-tx, linux,rs485-enabled-at-boot-time: see rs485.txt
+- rs485-rts-delay, rs485-rts-active-low, rs485-rx-during-tx,
+ linux,rs485-enabled-at-boot-time: see rs485.txt
Note: Optional properties for DMA support. Write them both or both not.