serial: 8250: allow UART drivers to override rx_trig_bytes handling

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The rx_trig_bytes sysfs attribute currently relies on 8250-internal
helper functions and assumes a fixed mapping between trigger levels and
FIFO behavior.

Some UARTs provide hardware-specific RX trigger mechanisms that do not
fit this model. Add optional uart_port callbacks for setting and getting
the RX trigger level, and use them when provided, while preserving the
existing 8250 helpers as the default fallback.

Signed-off-by: Crescent Hsieh <crescentcy.hsieh@moxa.com>
Link: https://patch.msgid.link/20260731074820.735619-13-crescentcy.hsieh@moxa.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Crescent Hsieh 2026-07-31 15:48:18 +08:00 • committed by Greg Kroah-Hartman

parent ade78d3d25

commit 8a6c543cf8

3 changed files with 18 additions and 2 deletions

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4

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

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14

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

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2

include/linux/serial_core.h

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