linux-kernel - Re: Possible regression with commit 52221610d

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Message-ID: <54907E1C.10300@wwwdotorg.org>
Date:	Tue, 16 Dec 2014 11:46:52 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Tim Kryger <tim.kryger@...il.com>, Bjorn Andersson <bjorn@...o.se>
CC:	Ulf Hansson <ulf.hansson@...aro.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	Sachin Kamat <spk.linux@...il.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>
Subject: Re: Possible regression with commit 52221610d

On 12/14/2014 09:48 PM, Tim Kryger wrote:
> On Sat, Dec 13, 2014 at 11:22 PM, Bjorn Andersson <bjorn@...o.se> wrote:
...
>> Or simply; what is vmmc (in the code) supposed to represent?
>
> Hi Bjorn,
>
> VMMC is the supply that delivers power out to the SD card itself (aka VDD).
>
> It is not the internal power rail/power domain of the host controller
> within the SoC.

I've seen this question come up quite a few times.

Should Documentation/devicetree/bindings/mmc/mmc.txt document the 
vmmc/vqmmc regulators? I assume they're considered shared across all 
MMC/SDHCI controller bindings?

Since that only covers DT, it might be nice to document vmmc-vs-vqmmc 
somewhere else too, such as right by the devm_regulator_get_optional() 
calls in mmc_regulator_get_supply() in drivers/mmc/core/core.c.
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