[MMC] Multiple cards on one host

[Sascha Hauer]

Hi,

I have a board (PXA based) which has two SD slots. It uses a gpio to
switch between the slots. In times when the MMC subsystem implemented
the bus topology our customer used this fact to connect the two slots on
a single host (although it was never intended to work with SD cards, it
seemed to work). Any idea how to implement this on recent kernels? I
thought about registering two hosts in pxamci.c, but this seems quite
hacky and I suppose I'll run into locking trouble.

Sascha

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