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| author |   Jeremy Kerr <jk@ozlabs.org> | 2018-03-27 11:48:24 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-23 10:16:50 +0200 |
| commit | c5f78b1fe4e5baf4c4ca30377c2d7e06e2e391ec (patch) | |
| tree | 7aa24241fd71460d638053895d3585660e10881e /include/linux/serial_core.h | |
| parent | serial: Remove depends on HAS_DMA in case of platform dependency (diff) | |
| download | linux-dev-c5f78b1fe4e5baf4c4ca30377c2d7e06e2e391ec.tar.xz linux-dev-c5f78b1fe4e5baf4c4ca30377c2d7e06e2e391ec.zip | |
serial: Introduce UPSTAT_SYNC_FIFO for synchronised FIFOs
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>
Diffstat (limited to 'include/linux/serial_core.h')
| -rw-r--r-- | include/linux/serial_core.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 1d356105f25a..d224961e1346 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -233,6 +233,7 @@ struct uart_port { #define UPSTAT_AUTORTS ((__force upstat_t) (1 << 2)) #define UPSTAT_AUTOCTS ((__force upstat_t) (1 << 3)) #define UPSTAT_AUTOXOFF ((__force upstat_t) (1 << 4)) +#define UPSTAT_SYNC_FIFO ((__force upstat_t) (1 << 5)) int hw_stopped; /* sw-assisted CTS flow state */ unsigned int mctrl; /* current modem ctrl settings */ |