spi: ep93xx: Convert to let spi core handle checking transfer speed
By setting master->max_speed_hz and master->min_speed_hz, spi core will handle checking transfer speed. So we can remove the same checking in this driver. Signed-off-by: NAxel Lin <axel.lin@ingics.com> Acked-by: NMika Westerberg <mika.westerberg@iki.fi> Signed-off-by: NMark Brown <broonie@linaro.org>
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