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The MMC clock we thought we had until now are actually not one but three different clocks. The main one is unchanged, and will have three outputs: - The clock fed into the MMC - a sample and output clocks, to deal with when should we output/sample data to/from the MMC bus The phase control we had are actually controlling the two latter clocks, but the main MMC one is unchanged. We can adjust the phase with a 3 bits value, from 0 to 7, 0 meaning a 180 phase shift, and the other values being the number of periods from the MMC parent clock to outphase the clock of. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Hans de Goede <hdegoede@redhat.com>