linux-kernel - Re: [PATCH 2/2] mmc: sdhci: Defer probe if regulator

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Date:	Tue, 23 Oct 2012 18:07:39 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Lucas Stach <dev@...xeye.de>,
	Pavan Kunapuli <pkunapuli@...dia.com>, linux@....linux.org.uk,
	cjb@...top.org, linux-tegra@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH 2/2] mmc: sdhci: Defer probe if regulator_get fails

On Tue, Oct 23, 2012 at 10:29:41AM -0600, Stephen Warren wrote:
> On 10/23/2012 01:57 AM, Lucas Stach wrote:

> > Does this work with boards where we don't have any MMC supplies? Or are
> > we just deferring the probe indefinitely there?

> > For boards that power MMC unconditionally, are we supposed to add dummy
> > regulators to make them work with this patchset?

> I believe that dummy (fixed) regulators are supposed to be provided in
> all cases where the platform doesn't actually have one. The fact that
> everything worked OK without them before this patch was most likely a
> mistake/accident.

That's the general idea; clearly there *are* supplies here, they're just
not software controlled supplies.

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