On Mon, Mar 28, 2011 at 08:34:42AM -0700, David Collins wrote:

regulator_set_optimum_mode currently only determines the load
on the specified regulator.  Physically however, this current
must be provided by regulators further up the supply chain.
Add code to handle uA_load propagation up through the regulator
supply chain.

We can't do this - current doesn't map 1:1 through a regulator, the
power consumption will map through but obviously there's a voltage
change involved and the regulators will not be 100% efficient so there
will also be some overhead from the chipld regulator.  The child
regulator needs to do the mapping in a regulator specific fashion.