serial: exar: Add RS-485 support for Sealevel XR17V35X based cards

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Sealevel XR17V35X based cards utilize DTR to control RS-485 Enable, but
the current implementation of 8250_exar uses RTS for the auto-RS485-Enable
mode of the XR17V35X UARTs. This patch implements DTR Auto-RS485 on
Sealevel cards.

Signed-off-by: Matthew Howell <matthew.howell@sealevel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenkoa@linux.intel.com>
Link: https://lore.kernel.org/r/4b8ad8ab6728742464c4e048fdeecb2b40522aef.camel@sealevel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Matthew Howell 2023-09-29 17:40:55 +00:00 • committed by Greg Kroah-Hartman

parent 6c756af23b

commit 687911b37e

1 changed files with 44 additions and 0 deletions

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drivers/tty/serial/8250/8250_exar.c

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