linux-kernel - Re: [PATCH v2 17/17] soc/tegra: remove lagacy powergate APIs

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Message-ID: <20150312161849.GF6072@tbergstrom-lnx.Nvidia.com>
Date:	Thu, 12 Mar 2015 18:18:49 +0200
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	Vince Hsu <vinceh@...dia.com>, <swarren@...dotorg.org>,
	<gnurou@...il.com>, <jroedel@...e.de>, <p.zabel@...gutronix.de>,
	<mturquette@...aro.org>, <pgaikwad@...dia.com>,
	<sboyd@...eaurora.org>, <robh+dt@...nel.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <linux@....linux.org.uk>,
	<tbergstrom@...dia.com>, <airlied@...ux.ie>, <bhelgaas@...gle.com>,
	<tj@...nel.org>, <arnd@...db.de>, <robh@...nel.org>,
	<will.deacon@....com>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
	<rjw@...ysocki.net>, <viresh.kumar@...aro.org>
Subject: Re: [PATCH v2 17/17] soc/tegra: remove lagacy powergate APIs

On Thu, Mar 12, 2015 at 01:45:02PM +0100, Thierry Reding wrote:
> * PGP Signed by an unknown key
> 
> On Thu, Mar 12, 2015 at 08:15:18PM +0800, Vince Hsu wrote:
> > We switch to generic power domain now. So remove the legacy functions.
> > 
> > Signed-off-by: Vince Hsu <vinceh@...dia.com>
> > ---
> >  drivers/soc/tegra/pmc.c | 68 -------------------------------------------------
> >  include/soc/tegra/pmc.h | 22 ----------------
> >  2 files changed, 90 deletions(-)
> 
> I don't think we can do this. What if somebody updates their kernel but
> not the DTB? In that case they'll end up with drivers that don't enable
> power partitions but at the same time the powergate driver won't enable
> them either because it is missing the corresponding nodes in the DTB.
> 
> What we'll have to do is probably keep the code that enables the power
> partitions and make it conditional on the power domains somehow. Is
> there a way to determine at runtime whether a device has been attached
> to a power domain?

Or use DT overlays to 'load' a hardcoded overlay for the specific SoC?

Cheers,

Peter.
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