mmc: sdhci: Add sd host v4 mode
For SD host controller version 4.00 or later ones, there're two modes of implementation - Version 3.00 compatible mode or Version 4 mode. This patch introduced an interface to enable v4 mode. Signed-off-by:Chunyan Zhang <zhang.chunyan@linaro.org> Acked-by:
Adrian Hunter <adrian.hunter@intel.com> Signed-off-by:
Ulf Hansson <ulf.hansson@linaro.org>
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