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

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Message-ID: <CAL_Jsq+A8v4EPZaGvAFohrg4TAw9a5fJy7ZJOOJ8T-OAyPuBUg@mail.gmail.com>
Date:	Mon, 6 Jul 2015 12:30:15 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Pali Rohár <pali.rohar@...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 Mon, Jul 6, 2015 at 11:20 AM, Pali Rohár <pali.rohar@...il.com> wrote:
> 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"...

Why can't you get the offset yourself?

However, why does this need to be early? It is only used to populate
/proc, right?

Rob
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