linux-kernel - Re: [PATCH v2 3/5] regulator: helper routine to extract regulator_init

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Date:	Wed, 19 Oct 2011 15:47:34 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Shawn Guo <shawn.guo@...escale.com>
Cc:	patches@...aro.org, tony@...mide.com,
	devicetree-discuss@...ts.ozlabs.org,
	Rajendra Nayak <rnayak@...com>, linux-kernel@...r.kernel.org,
	grant.likely@...retlab.ca, linux-omap@...r.kernel.org, lrg@...com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/5] regulator: helper routine to extract
 regulator_init_data

On Wed, Oct 19, 2011 at 01:33:55PM +0800, Shawn Guo wrote:
> On Tue, Oct 18, 2011 at 05:00:46PM +0100, Mark Brown wrote:

> > It's not just Linux-specific stuff, some of this is even specific to
> > what current Linux drivers can do - updating the kernel could mean a
> > different set of constraints.

> Well, from what I see, the 'struct regulation_constraints' is defined
> in machine.h and meant to be the regulator machine/board interface.

...which will depend on the system integrator's understanding of what
their system is capable of right now.

> With the example I'm looking at, mc13892, the regulation_constraints
> configuration is fully passed from machine/board file.  If there is
> something specific to what drivers can do, it probably should be encoded
> in regulator driver rather than staying in regulation_constraints.

I don't think you're quite understanding the issue - it's an integration
problem with three different variables.  It's a combination of what the
chips can do, what the drivers can do and if the board design affects
any of this stuff.  Only the board can come to a final decision.
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