serial: imx: add support for DTE mode
The uart works in the DCE mode by default, but sometime we need it works at the DTE mode. This patch adds the support for the DTE mode. Signed-off-by: Huang Shijie <b32955@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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