uart: pl011: Introduce register look up table
Introduce register look up table as different SOC venders may have different register offset for the some register. Signed-off-by: Jun Nie <jun.nie@linaro.org> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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