tree 1a693b88ee1c976704262a09b788ef0c4e62f87c
parent d14654dff7a3520b5220367b848732a0a8ccdabe
author Paul Chavent <Paul.Chavent@onera.fr> 1379313660 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1380213940 -0700

USB: serial: invoke dcd_change ldisc's handler.

The DCD pin of the serial port can receive a PPS signal. By calling
the port line discipline dcd handle, this patch allow to monitor PPS
through USB serial devices.

However the performance aren't as good as the uart drivers, so
document this point too.

Signed-off-by: Paul Chavent <paul.chavent@onera.fr>
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>