Re: [RESEND] [PATCH v2 1/2] arm: devtree: Set system_rev from DT revision

["Pali Rohár" <pali.rohar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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On Monday 06 July 2015 17:22:58 Rob Herring wrote:
> On Mon, Jul 6, 2015 at 8:12 AM, Pali Rohár <pali.rohar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > On Monday 06 July 2015 14:31:27 Tony Lindgren wrote:
> >> * Pali Rohár <pali.rohar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> [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-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org


-- 
Pali Rohár
pali.rohar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

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