linux-kernel - Re: [PATCH] regulator: Provide dummy supply support

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Message-ID: <20111102104126.GA2678@opensource.wolfsonmicro.com>
Date:	Wed, 2 Nov 2011 10:41:27 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Mike Frysinger <vapier@...too.org>, linux-kernel@...r.kernel.org,
	Liam Girdwood <lrg@...com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Tony Lindgren <tony@...mide.com>, linux-sh@...r.kernel.org,
	linux-omap@...r.kernel.org, uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH] regulator: Provide dummy supply support

On Wed, Nov 02, 2011 at 11:03:56AM +0100, Sascha Hauer wrote:
> On Tue, Nov 01, 2011 at 06:27:21PM +0000, Mark Brown wrote:

> > As I think I said earlier I'd use the fixed regulator for this, all
> > Sascha's actually doing here is adding a wrapper to simplify
> > registration of that.

> There's one difference between the fixed and the dummy regulator though:
> The fixed regulator has a voltage. The same dummy regulator instance can

No, the voltage is optional.

> be used for all devices which do not have a software controllable
> regulator. I think the same can be done with the fixed regulator aswell,
> but the bogus voltage showing up in the sysfs entry might be confusing
> to users.

I don't think that's a meaningful issue, any in any case it'd be better
practice to fill it in so devices can use the information if they want
to (which really shouldn't be hard

> Another approach to this topic would be to allow a board to explicitely
> bind to the existing dummy regulator, like the following (error path
> should of course be implemented before applying this)

If you know you've got a fixed voltage supply I don't understand why you
wouldn't want to set one up.  There clearly is an actual supply in the
system...
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