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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>