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

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Date:	Thu, 26 Jul 2012 14:45:52 -0700
From:	Kevin Hilman <khilman@...com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Arnd Bergmann <arnd@...db.de>,
	devicetree-discuss@...ts.ozlabs.org,
	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	Benoit Cousson <b-cousson@...com>
Subject: Re: [RFC][PATCH 0/14] PM / shmobile: Pass power domain information via DT (was: Re: [RFD] PM: Device tree representation of power domains)

Mark Brown <broonie@...nsource.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



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