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Some eMMC controllers need specific settings for HS400 mode before the speed mode can be switched to DDR mode, during the HS400 initialization sequence. For that reason, let's introduce a new host callback, ->hs400_prepare_ddr() and invoked it just before switching to DDR mode. Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>