linux-kernel - Re: [linux-sunxi] [RFC] ARM: dts: sunxi: Add regulators and board-specific operating points for LeMaker BananaPi

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Date:	Tue, 28 Jul 2015 14:55:45 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Timo Sigurdsson <public_timo.s@...entcreek.de>
Cc:	hdegoede@...hat.com, wens@...e.org, galak@...eaurora.org,
	linux-kernel@...r.kernel.org, mark.rutland@....com,
	devicetree@...r.kernel.org, ijc+devicetree@...lion.org.uk,
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...glegroups.com,
	pawel.moll@....com, linux@....linux.org.uk, robh+dt@...nel.org
Subject: Re: [linux-sunxi] [RFC] ARM: dts: sunxi: Add regulators and
 board-specific operating points for LeMaker BananaPi

On Tue, Jul 28, 2015 at 11:02:16AM +0200, Timo Sigurdsson wrote:
> Hi,
> 
> Chen-Yu Tsai schrieb am 27.07.2015 15:14:
> >> ChenYu (in the CC), since you did most of the original work here, do
> >> you know why we have an op at 0.9 volt, but none of our boards allow the
> >> voltage to go that low in the regulator settings ?
> > 
> > I'm on vacation now, so apologies for the bad formatting.
> > 
> > The OPPs are from a common subset
> > of the settings from the fex files available
> > at the time. Some fex files actually set
> > min and max voltage thus eliminating
> > the highest and lowest OPPs.
> > 
> > At least that is how Maxime and I
> > interpreted them.
> 
> IMHO for a common maximum opp that's a good approach. But for the lowest
> frequency setting, it would seem more logical to me, to raise the voltage
> to a point where all boards will run fine with them, unless those boards 
> cannot handle the frequency regardless of the higher voltage.

Agreed.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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