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> You may need to do both.  At least if you use the same format for the
> ebc binding as I have on Ebony: in the reg properties of the
> individual nodes I directly encode the ebc chip select value and
> offset within the peripheral bank.  The ebc node's 'ranges' gives the
> mappings into the OPB space.  So, in practice, the low 20 bits of
> address are determined by the individual peripheral's reg properties,
> and the upper 12 bits are determined by the ranges property at the EBC
> node.

In addition we might want a helper to fix the node unit address after
poking reg ...

Ben.