linux-kernel - Re: [RESEND] [PATCH v2 1/2] arm: devtree: Set system

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Message-Id: <201507061820.35789@pali>
Date:	Mon, 6 Jul 2015 18:20:35 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Tony Lindgren <tony@...mide.com>, Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Sebastian Reichel <sre@...ian.org>,
	Pavel Machek <pavel@....cz>,
	Andreas Färber <afaerber@...e.de>,
	"linux-omap" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [RESEND] [PATCH v2 1/2] arm: devtree: Set system_rev from DT revision

On Monday 06 July 2015 17:22:58 Rob Herring wrote:
> On Mon, Jul 6, 2015 at 8:12 AM, Pali Rohár <pali.rohar@...il.com> wrote:
> > On Monday 06 July 2015 14:31:27 Tony Lindgren wrote:
> >> * Pali Rohár <pali.rohar@...il.com> [150706 05:25]:
> >> > into which file should I put documentation about new DT
> >> > properties?
> >> 
> >> If it's Linux generic like linux,revision, then how about
> >> Documentation/devicetree/bindings/revision.txt?
> >> 
> >> For the ATAGs, Documentation/devicetree/bindings/arm/atag.txt?
> >> 
> >> Regards,
> >> 
> >> Tony
> > 
> > Hm... now I'm thinking into which DT field should I put atags and
> > revision. In previous emails you wrote to use "linux,atags", now
> > "arm,atags"? And put them into root node? Or other?
> > 
> > In arch/arm/boot/compressed/atags_to_fdt.c code I see that most
> > atag properties are converted into "/chosen" node in DT...
> > 
> > So what do you prefer for "revision" and what for "atags"?
> > 
> > Some mentioned examples:
> > 
> > "/revision"
> 
> This one. This is a top level h/w property.
> 
> > "/chosen/revision"
> > "/linux,revision"
> > "/chosen/linux,revision"
> > ...
> > 
> > "/atags"
> > "/chosen/atags"
> > "/linux,atags"
> > "/chosen/linux,atags"
> 
> This one. ATAGs are a Linux data struct.
> 
> Rob
> 

Ok, and how read that property "/chosen/linux,atags" in function
setup_machine_fdt() from file arch/arm/kernel/devtree.c ?

of_get_flat_dt_prop() cannot be used unless somebody get me offset to
node "/chosen"...

Any idea?

> > "/arm,atags"
> > "/chosen/arm,atags"
> > ...
> > 
> > --
> > Pali Rohár
> > pali.rohar@...il.com


-- 
Pali Rohár
pali.rohar@...il.com

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