serial: 8250: allow low-level drivers to override break control

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Some UARTs require driver-specific handling for break signaling, which
cannot be expressed by the generic 8250 break implementation alone.

Add an optional uart_port break_ctl callback and route
serial8250_break_ctl() through it when provided. Rename the existing
8250 implementation to serial8250_do_break_ctl() and export it so
low-level drivers can reuse the default 8250 behavior when appropriate.

Signed-off-by: Crescent Hsieh <crescentcy.hsieh@moxa.com>
Link: https://patch.msgid.link/20260731074820.735619-11-crescentcy.hsieh@moxa.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Crescent Hsieh 2026-07-31 15:48:16 +08:00 • committed by Greg Kroah-Hartman

parent d21a1509c6

commit af1ba61b62

4 changed files with 14 additions and 1 deletions

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2

drivers/tty/serial/8250/8250_core.c

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11

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

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1

include/linux/serial_8250.h

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1

include/linux/serial_core.h

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