BTW, Are there reason to omit the sdhci-s3c.c? Maybe Mr. Jung will handle it.
The difference is that sdhci-s3c.c was more like a fork of sdhci-pltfm while the others were users of it. With the new interface, s3c can be converted using pltfm more easily. If somebody is willing to do that, this is very much welcome. I'd suggest waiting for Shawn's interface to stabilize, though.
Regards,
Wolfram