serial: 8250: Deduplicate ->rs485_config() callback

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Commit e490c9144c ("tty: Add software emulated RS485 support for 8250")
introduced support to use RTS as an rs485 Transmit Enable signal.
Drivers opt in to the feature by calling serial8250_em485_init() from
their ->rs485_config() callback.

So far there are two drivers doing that, 8250_omap.c and 8250_of.c.
Both use an identical callback.  We're about to add a third user of that
callback, therefore deduplicate it and move it to 8250_port.c.

Drivers now opt in to rs485 software emulation by assigning the generic
serial8250_rs485_config() callback introduced herein to their
.rs485_config struct member.  This change allows unexporting
serial8250_em485_init() and declaring it static.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Matwey V. Kornilov <matwey@sai.msu.ru>
Cc: Heiko Schocher <hs@denx.de>
Link: https://lore.kernel.org/r/fcef63642dc4eae41ae7842d23747b2bf5d40285.1582895077.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Lukas Wunner 2020-02-28 14:31:03 +01:00 • committed by Greg Kroah-Hartman

parent fe7f0fa43c

commit 283e096ffb

4 changed files with 42 additions and 65 deletions

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2

drivers/tty/serial/8250/8250.h

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32

drivers/tty/serial/8250/8250_of.c

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32

drivers/tty/serial/8250/8250_omap.c

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41

drivers/tty/serial/8250/8250_port.c

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