linux-kernel - Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry

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Message-ID: <17134653.86P3dFyQKK@wuerfel>
Date:	Wed, 25 Nov 2015 20:48:59 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Pali Rohár <pali.rohar@...il.com>,
	Pavel Machek <pavel@....cz>,
	Frank Rowand <frowand.list@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Laura Abbott <lauraa@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robherring2@...il.com>,
	Will Deacon <will.deacon@....com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Sebastian Reichel <sre@...ian.org>,
	Andreas Färber <afaerber@...e.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry

On Wednesday 25 November 2015 10:16:44 Tony Lindgren wrote:
> * Pali Rohár <pali.rohar@...il.com> [151123 06:46]:
> > On Sunday 22 November 2015 07:51:46 Pavel Machek wrote:
> > > On Wed 2015-11-11 17:10:46, Frank Rowand wrote:
> > > > Adding devicetree list.
> > > > 
> > > > Thread starts at
> > > > http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/354459.html
> > > > 
> > > > On 11/5/2015 8:17 AM, Tony Lindgren wrote:
> > > > > * Pali Rohár <pali.rohar@...il.com> [151105 03:41]:
> > > > >> On Tuesday 13 October 2015 16:37:46 Pali Rohár wrote:
> > > > >>> On Monday 12 October 2015 13:45:09 Tony Lindgren wrote:
> > > > >>>> * Pali Rohár <pali.rohar@...il.com> [151012 13:29]:
> > > > >>>>> On Monday 12 October 2015 22:16:40 Tony Lindgren wrote:
> > > > >>>>>>
> > > > >>>>>> Pali, any news on posting an updated series with the comments
> > > > >>>>>> addressed in this thread? It seems that we all pretty much agree
> > > > >>>>>> what needs to be done.
> > > > 
> > > > I'm not real happy with the concept of patches 4 and 5 in this series.
> > > > My concern is that those two patches are using the FDT as a transport
> > > > mechanism for a binary blob (the atags object).
> > > 
> > > Umm. Ok. Do you have alternative proposal that works for everyone?
> > > 
> > > I mean. This discussion was going for quite a long time, and it would
> > > be nice to have some solution... patch proposal... something.
> > >                                                                     Pavel
> > 
> > Yes, discussion is going for a long time! So should I spend time for
> > adding documentation to my solution (this is last one thing which is
> > missing)? Or my solution is wrong and somebody else will propose new?
> > I do not want to spend time on something which will be rejected and
> > discarded.
> 
> At least I don't have better solutions in mind.

I would be happier if we could restrict this as much as possible to the
boards that need it, as an opt-in. That way it doesn't become an ABI
for people that don't already rely in this information. How about
adding a check the code adds the linux,atags property to do it
only for a whitelist of board numbers?

	Arnd
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