Hello,
I would like to highlight the issue comparing omap-serial driver and
8250_omap. The latter lacks RS485 functionality. RS485 is electrical
only specification so it can be unrelated to underlying UART (or even
converted from RS232 somewhere out of the PC), but then the UART driver
is required to handle transmission direction. This is usually done using
RTS signal, please look into serial_omap_start_tx and
serial_omap_stop_tx. Current RS485 kernel API in 8250_core focuses on
hardware implemented line direction control and there is no way to
implement software emulated line direction control as it is in
serial_omap_{start,stop}_tx.
I would like to see your comments on how 8250_core could be expanded to
implement functionality which was in omap-serial but has not been
available in 8250_omap anymore.
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