On Thu, Mar 24, 2016 at 07:25:35PM +0900, Krzysztof Kozlowski wrote:

On Thu, Mar 24, 2016 at 6:53 PM, Mark Brown [off-list ref] wrote:

quoted

Why does this regulator even have voltage constraints configured?  Is
there any intention that it should ever be varied at runtime?

Good question. I was also wondering that, if tetting it by 5 mV lower
causes failure, then the constraints are actually fixed at 3.755 V. I
do not know the answer. Boards schematics do not specify the
requirement here, datasheet for PMIC says default value of 3.4V. Heh,

For some reason people seem to frequently want to put the maximum
voltage range for the regulator into the constraints even though that is
almost certainly broken and generally nonsensical.

maybe the regulator driver is missing proper starting value for 'vsel'
(datasheet says values in register start from 0x40 -> 3 V). Something
looks wrong here...

It's possible it's just broken and has never been tested.