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

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Date:	Mon, 6 Jul 2015 18:36:03 +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 18:20:35 Pali Rohár wrote:
> > > "/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?
> 

fdt_path_offset() from libfdt.h seems to work...

Is solution like this one acceptable?

#include <linux/libfdt.h>
#include "atags.h"

... setup_machine_fdt(unsigned int dt_phys) {

dt_virt = phys_to_virt(dt_phys);
dt_chosen = fdt_path_offset(dt_virt, "/chosen");
atags = of_get_flat_dt_prop(dt_chosen, "linux,atags", NULL);
save_atags(atags);

}

(this is without checks for errors)

-- 
Pali Rohár
pali.rohar@...il.com

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