serial: imx: implement DSR irq handling for DTE mode
Enable reporting of DSR events (which is named DTR in the registers because Freescale uses the names as seem from a DCE). Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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