On Wed, Nov 14, 2012 at 04:36:28PM +0800, Kevin Liu wrote: > 2012/11/14 Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>: > > 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.
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