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 14:49:11 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Hans de Goede <hdegoede@...hat.com>
Cc:	public_timo.s@...entcreek.de, 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,

On Mon, Jul 27, 2015 at 02:43:20PM +0200, Hans de Goede wrote:
> Hi,
> 
> On 27-07-15 14:09, public_timo.s@...entcreek.de wrote:
> >Hi,
> >
> >Hans de Goede schrieb am 27.07.2015 10:07:
> >
> >>I've a simular patch here:
> >>
> >>https://github.com/jwrdegoede/linux-sunxi/commit/6a30b7d5be6012b81e5e1439a444e41c0ac1afc1
> >>
> >>I did not submit this upstream yet as it is part of a series to enable the otg
> >>controller on the bananapi which needs axp-usb-power-supply support for which
> >>the actual powersupply driver changes are still pending.
> >
> >Oops, I see. Are you planning to submit this for 4.3 or later?
> 
> I plan to submit this for 4.3.

I don't feel like holding patches that were posted before you did
because you did them some time ago and never submitted them is
reasonnable and / or encouraging for new submitters of patches.

I'd really like to get more sunxi-people contributing, and that starts
with that kind of trivial stuff. Holding them back because one of the
usual (and experienced) developpers is a bit counter-productive (and
I'm sure you still have a lot of patches to submit anyway ;)).

> >>As you can see other then you adding the cpu operating points are patches are
> >>identical, which is good :)
> >Yep, that and you chose a slightly higher maximum voltage for the CPU.
> >
> >>IMHO we should just stick with the standard operating points unless we know
> >>that there are stability issues with them (such as e.g. on the A10 OlinuxIno
> >>Lime).
> >I'd be fine with that as I don't have any stability issues with the lower
> >voltages. What about the 1008MHz operating point that I "reintroduced"? It was
> >dropped here [1]  because there was no regulator support.
> 
> That is in essence an overclocked setting, the max CPU voltage officially is
> 1.4V, I do not think that we should provide any overclocked settings in the
> official dts files. If people really want to overclock they will have to
> modify there dts themselves IMHO.

I fully agree.

> > Can this be reenabled on board level (which means overriding the
> >defaults inherited from sun7i-a20.dtsi) or should this be done at
> >SOC level for all boards (which means we have to add regulator
> >nodes for all boards in the first place)?
> 
> Technically this is possible, but I do not think that it is a good idea.

And here as well.

Maxime

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

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