linux-kernel - Re: [PATCH v3 2/4] ARM: bcm2835: add rpi power domain driver

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Message-ID: <20151216011110.GA13147@earth>
Date:	Wed, 16 Dec 2015 02:11:11 +0100
From:	Sebastian Reichel <sre@...g0.de>
To:	Eric Anholt <eric@...olt.net>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-arm-kernel@...ts.infradead.org,
	linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Stephen Warren <swarren@...dotorg.org>,
	Lee Jones <lee@...nel.org>, Kevin Hilman <khilman@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexander Aring <alex.aring@...il.com>,
	devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>
Subject: Re: [PATCH v3 2/4] ARM: bcm2835: add rpi power domain driver

Hi,

On Tue, Dec 15, 2015 at 04:53:31PM -0800, Eric Anholt wrote:
> >>> What motivated the location of this power domain driver in
> >>> arch/arm/mach-bcm? Should not we have this in drivers/power/ or
> >>> somewhere in drivers/ at the very least?
> >> 
> >> ls stronly suggests that power contains drivers for power supplies and
> >> batteries, not power domains.

Indeed it's used for fuel gauges and chargers, but also for
reboot/powerdown and adaptive voltage scaling, so another
subdirectory for power-domains wouldn't be that odd.

> >> There are 6 power domain drivers in
> >> arch/arm, 3 in drivers/clk, and 3 in drivers/soc.
> >
> > If we ever have to support a different architecture which happens to use
> > a similar power domain, then we want it to be in a location which makes
> > it easy for sharing it in the first place. As it stands today, it does
> > not seem useful to me to have this code in arch/arm/mach-bcm/ at all.
> >
> > Maybe there is room from a drivers/power/domains/ of some kind?

I like the idea, but let's include generic power domain maintainers
in this discussion, as I suggested here (I got a power domain driver
patch for drivers/power just a few days ago):

https://lkml.org/lkml/2015/12/15/815

Also somebody would have to step up to maintain that directory.

> The great thing about git is that moving code is easy, even after it's
> first committed.
>
> The subsystem maintainer didn't comment on the code's location in v1 or
> v2, and I think they probably have the final say on that.  Whatever they
> want, where there is currently a genpd driver, is fine with me.

sounds reasonable.

P.S.: Thanks for taking bringing RPI support upstream :)

-- Sebastian

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