From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Subject: Re: [PATCH 1/2] regulator: add regulator_is_dummy function
Date: Mon, 7 Jan 2013 13:22:16 +0000
Message-ID: <20130107132216.GF4544@opensource.wolfsonmicro.com>
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To: "Dr. Rainer Kaluscha" <rainer.kaluscha@web.de>
Cc: Kevin Liu <kliu5@marvell.com>, linux-pm@vger.kernel.org, linux-mmc@vger.kernel.org, Chris Ball <cjb@laptop.org>, Marek Szyprowski <m.szyprowski@samsung.com>, Rainer Kaluscha <ich@rainer-kaluscha.de>, Philip Rakity <prakity@nvidia.com>, Zhangfei Gao <zhangfei.gao@gmail.com>, Haojian Zhuang <haojian.zhuang@gmail.com>, Chao Xie <cxie4@marvell.com>, Kevin Liu <keyuan.liu@gmail.com>
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On Mon, Jan 07, 2013 at 01:30:54PM +0100, Dr. Rainer Kaluscha wrote:

> The problem is that *only* a dummy regulator is available which
> refuses to do any regulation at all.
> So sdhci/mmc should better behave as no regulator was available at all.
> This may happen if e.g. in a precompiled kernel of some linux distro
> regulator support (including dummy) is enabled but the machine
> running that kernel doesn't have a known hardware regulator. This
> results in sdhci/mmc failing to enable the SD card reader though it
> would work well without regulator support in the kernel.

Production systems should not enable the dummy regulators, it's that
simple.  They're a crutch to get things booting but they're going to
cause problems in production.

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