linux-kernel - Re: [PATCH 1/1] mmc: core: Use regulator_get

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Message-ID: <20140814151958.GY17528@sirena.org.uk>
Date:	Thu, 14 Aug 2014 16:19:58 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Tim Kryger <tim.kryger@...il.com>
Cc:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Chris Ball <chris@...ntf.net>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Tim Kryger <tim.kryger@...aro.org>,
	Haijun Zhang <Haijun.Zhang@...escale.com>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>,
	Yuvaraj Kumar C D <yuvaraj.cd@...il.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] mmc: core: Use regulator_get_voltage() if OCR mask
 is empty.

On Thu, Aug 14, 2014 at 07:13:00AM -0700, Tim Kryger wrote:
> On Thu, Aug 14, 2014 at 5:39 AM, Javier Martinez Canillas

> > Without this patch, the following warning is reported when
> > a FET is used as a vmmc-supply:

> > dwmmc_exynos 12220000.mmc: Failed getting OCR mask: -22

> > Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>

> https://lkml.org/lkml/2014/8/12/377

For the benefit of those reading here 

> Perhaps I misunderstood the discussion in that thread but couldn't
> this failure also be addressed by adding proper constraints for each
> FET in individual DTS files to reflect the range of voltages that are
> safe for all consumers of that supply on the board?

> I thought the main concern with your other change was that the
> constraints you listed in the DTSI represented the limits of the PMIC
> and not the consumers.

Right, there's two things going on here.  One is that as you describe we
shouldn't be putting constraints in .dtsi files if we don't know they're
OK for a given board.  The other thing is that on this particular board
it turns out that there's no support for varying the voltages at all so
it doesn't make sense to have to specify a range, there's only one value
anyway so the software really should be able to figure out that fixed
value all by itself.

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