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Subject[PATCH] regulator: provide dummy supply support

The following patch allows it for boards to register a dummy supply for
devices for which no software controllable regulator is available. The
current CONFIG_REGULATOR_DUMMY and (unused) regulator_use_dummy_regulator()
mechanisms only allow to provide a dummy regulator for *all* devices
for which no regulator is found. This would shadow real errors and thus
is not really an option for production kernels.

This patch may eventually superseed the current all-or-nothing approach.

This came to me while looking over Linus' smsc911x regulator support
patch and so I added all people affected by this patch to Cc.


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