lkml.org 
[lkml]   [2012]   [Nov]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: FW: [PATCH v2] mmc: sdhci: apply voltage range check only for non-fixed regulators
On Wed, Nov 14, 2012 at 04:36:28PM +0800, Kevin Liu wrote:
> 2012/11/14 Mark Brown <broonie@opensource.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.
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2012-11-14 10:21    [W:0.075 / U:2.300 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site