USB: serial: f81534: implement break control

Implement Fintek f81534 break on/off with LCR register.
It's the same with 16550A LCR register layout.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Ji-Ze Hong (Peter Hong) 2017-10-13 10:21:35 +08:00 • committed by Johan Hovold
commit 7c36e6e14d