Hi, On Tue, Dec 22, 2015 at 12:29:24PM +0800, Chen-Yu Tsai wrote: > >>> So this means enabled the sdio controller (should be safe on all > >>> boards?) and enabling 2 regulators to power the wifi-chip. I > >>> think it will be safe to do this even on boards where those > >>> regulators are not used, what do you think ? > >> > >> Wouldn't that introduce some useless power drain on those boards? > > > > > > If nothing is attached to those regulators (which I expect to be > > the case when they are not used to power wifi) then I would expect > > the drain to be minimal, my biggest worry is some board having > > tied these to ground, but I don't think that is very likely. > > AFAIK the AXP datasheets mention that unused DCDC outputs should be left > floating. Not sure if this applies to LDO outputs as well. But any used > outputs would have a bypass capacitor. > > From the board designs I've seen, this seems to be the common case. > I'm not an electrical engineer, but I think we're covered here. Ok, I guess we're good then. Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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