linux-kernel - Re: FW: [PATCH v2] mmc: sdhci: apply voltage range check only for non-fixed regulators

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Message-ID: <CADz5_gJDHeZNoWRF18YJKY3kT1vN0=d-eLcP1wgWxYhLNnbpDQ@mail.gmail.com>
Date:	Wed, 14 Nov 2012 16:57:56 +0800
From:	Kevin Liu <keyuan.liu@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	m.szyprowski@...sung.com, Chris Ball <cjb@...top.org>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	kyungmin.park@...sung.com, lrg@...com,
	Philip Rakity <prakity@...dia.com>
Subject: Re: FW: [PATCH v2] mmc: sdhci: apply voltage range check only for
 non-fixed regulators

2012/11/14 Mark Brown <broonie@...nsource.wolfsonmicro.com>:
> On Wed, Nov 14, 2012 at 04:36:28PM +0800, Kevin Liu wrote:
>> 2012/11/14 Mark Brown <broonie@...nsource.wolfsonmicro.com>:
>
>> > Should this be regulator_set_voltage_tol()?  Otherwise it'd be good to
>> > explain where the numbers come from.
>
>> In SD physical layer spec 3.01 chapter 6.6.1, the threshold level for
>> voltage range is defined as below:
>> Vdd(min) = 2.7V while Vdd(max) = 3.6V.
>> The card should work within the voltage range.
>
>> If you are afraid the voltage value is too aggressive, maybe we can
>> use regulator_set_voltage_tol() to set a smaller range.
>> But which range should be reasonable?
>
> The above makes total sense - thanks!  I just wasn't aware that the
> range was specified in this fashion in the spec.  Might be worth a
> comment in the code if you need to respin.

Sure, I will update the patch. Thanks!
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