serial: sprd: Add loopback function support
Add loopback function support for Spreadtrum serial controller. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Link: https://lore.kernel.org/r/1275cd9968f1ceb5ac049cc23f1e508025cd552f.1566375260.git.baolin.wang@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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