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Some newer MMCIF IP revisions contain a CE_CLK_CTRL2 register, that has to be set for proper operation. Support for this feature is added in a way to preserve the current behaviour by default, i.e. when it is not enabled in platform data. Patch is based on work by Nobuyuki HIRAI. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Signed-off-by: Chris Ball <cjb@laptop.org>