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

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Date:	Mon,  3 Aug 2015 00:00:06 +0200 (CEST)
From:	"Timo Sigurdsson" <public_timo.s@...entcreek.de>
To:	monnier@....umontreal.ca
Cc:	maxime.ripard@...e-electrons.com, hdegoede@...hat.com,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@....linux.org.uk, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-sunxi@...glegroups.com, wens@...e.org
Subject: Re: [linux-sunxi] [RFC] ARM: dts: sunxi: Add regulators and board-specific operating points for LeMaker BananaPi

Hi Stefan,

you didn't include me in your answer, hence the late reply...

Stefan Monnier schrieb am 29.07.2015 02:02:
>> 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.

> I generally agre, tho IIRC some measurements seem to indicate that the
> lowest frequency settings did not bring much (if any) reduction in power
> consumption, making them rather useless.

That's an interesting point. However, that would be a different discussion. I
wouldn't mind if the 144MHz would be removed - my point was just that if it's 
supposed to be a common setting, it should work on all boards. I posted a patch
today to fix this. [1] That might be a good place to discuss whether this
setting should be removed entirely.

Regards,

Timo

[1] https://groups.google.com/forum/#!topic/linux-sunxi/fIfbdn7mrQA

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