serial: Introduce UPSTAT_SYNC_FIFO for synchronised FIFOs

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This change adds a flag to indicate that a UART is has an external means
of synchronising its FIFO, without needing CTSRTS or XON/XOFF.

This allows us to use the throttle/unthrottle callbacks, without having
to claim other methods of flow control.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Tested-by: Eddie James <eajames@linux.vnet.ibm.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jeremy Kerr 2018-03-27 11:48:24 +08:00 • committed by Greg Kroah-Hartman

parent d6810a82c7

commit c5f78b1fe4

2 changed files with 3 additions and 2 deletions

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4

drivers/tty/serial/serial_core.c

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1

include/linux/serial_core.h

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