serial: core: move RS485 configuration tasks from drivers into core

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Several drivers that support setting the RS485 configuration via userspace
implement one or more of the following tasks:

- in case of an invalid RTS configuration (both RTS after send and RTS on
  send set or both unset) fall back to enable RTS on send and disable RTS
  after send

- nullify the padding field of the returned serial_rs485 struct

- copy the configuration into the uart port struct

- limit RTS delays to 100 ms

Move these tasks into the serial core to make them generic and to provide
a consistent behaviour among all drivers.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Link: https://lore.kernel.org/r/20220410104642.32195-2-LinoSanfilippo@gmx.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Lino Sanfilippo 2022-04-10 12:46:34 +02:00 • committed by Greg Kroah-Hartman

parent 368ab68b18

commit 0ed12afa56

1 changed files with 33 additions and 0 deletions

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drivers/tty/serial/serial_core.c

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