On Wed, Jul 25, 2012 at 05:38:35PM -0700, Kevin Hilman wrote:

That being said, I'm not sure why ti,hwmods is being used as an example
for powerdomains.  hwmods describe the integration of SoC IP blocks
(base addr, IRQ, DMA channel etc., which are being moved to DT) as well
as a bunch of SoC specific PM register descriptions.  This stuff is
SoC-specific PM register layout, so being very SoC specific, it has the
'ti' prefix in the DT binding.

I think the thing here is that one aspect of that SoC integration is
which power domain the blocks are in.  Describing which power domain an
IP is in isn't a million miles away from describing which hwmod applies
to an IP.