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 11:02:16 +0200 (CEST)
From:	"Timo Sigurdsson" <public_timo.s@...entcreek.de>
To:	hdegoede@...hat.com, wens@...e.org
Cc:	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, maxime.ripard@...e-electrons.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

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.

Regards,

Timo
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