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Double Transfer Rate (DTR) is SPI protocol in which data is transferred on each clock edge as opposed to on each clock cycle. Make framework-level changes to allow supporting flashes in DTR mode. Right now, mixed DTR modes are not supported. So, for example a mode like 4S-4D-4D will not work. All phases need to be either DTR or STR. Signed-off-by: Pratyush Yadav <p.yadav@ti.com> Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>