From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Mon, 4 Jan 2016 11:11:21 +0100 Subject: [linux-sunxi] Re: [PATCH 4/5] ARM: dts: sun5i: Add dts file for the Empire Electronix D709 tablet In-Reply-To: References: <1450611782-9494-1-git-send-email-hdegoede@redhat.com> <1450611782-9494-4-git-send-email-hdegoede@redhat.com> <5677D87A.90805@redhat.com> <20151221161132.GA30359@lukather> <567854D5.7030601@redhat.com> Message-ID: <20160104101121.GC11722@lukather> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: