[linux-sunxi] Re: [PATCH 4/5] ARM: dts: sun5i: Add dts file for the Empire Electronix D709 tablet

Hi,

On Tue, Dec 22, 2015 at 12:29:24PM +0800, Chen-Yu Tsai wrote:

quoted

quoted

quoted

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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