[RFC][PATCH 0/14] PM / shmobile: Pass power domain information via DT (was: Re: [RFD] PM: Device tree representation of power domains)

[Kevin Hilman]

Mark Brown <broonie at opensource.wolfsonmicro.com> writes:

> 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.

Not a million miles, just a million transistors. ;)

Ideally, we will eventually have a representation that can map
from regulators all the way down to IP blocks.  regulator --> voltage
domain --> power domain --> clock domain --> clocks --> IP block.

Currently we have bindings for regulators,  IP blocks (ti,hwmods on
OMAP) and clocks are in progress.  Eventually, we'll need everything
else in between.

Kevin