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: NJi-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com> Signed-off-by: NJohan Hovold <johan@kernel.org>
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