linux-kernel - Re: [PATCH 05/10] ARM: sunxi: Add Allwinner A31 DTSI

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Date:	Fri, 26 Jul 2013 14:48:28 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Mike Turquette <mturquette@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	albert.u.boot@...baud.net, Emilio Lopez <emilio@...pez.com.ar>,
	linux-kernel@...r.kernel.org, shuge@...winnertech.com,
	linux-sunxi@...glegroups.com, kevin.z.m.zh@...il.com,
	sunny@...winnertech.com, Olof Johansson <olof@...om.net>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 05/10] ARM: sunxi: Add Allwinner A31 DTSI

Hi Thomas,

On Fri, Jul 26, 2013 at 12:37:47PM +0200, Thomas Petazzoni wrote:
> Dear Maxime Ripard,
> 
> On Wed, 24 Jul 2013 00:25:07 +0200, Maxime Ripard wrote:
> 
> > diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> > index 641b3c9..1482533 100644
> > --- a/arch/arm/boot/dts/Makefile
> > +++ b/arch/arm/boot/dts/Makefile
> > @@ -210,7 +210,8 @@ dtb-$(CONFIG_ARCH_SUNXI) += \
> >  	sun4i-a10-mini-xplus.dtb \
> >  	sun4i-a10-hackberry.dtb \
> >  	sun5i-a10s-olinuxino-micro.dtb \
> > -	sun5i-a13-olinuxino.dtb
> > +	sun5i-a13-olinuxino.dtb \
> > +	sun6i-a31-colombus.dtb
> 
> Wrong patch for this chunk. The colombus .dts is added in PATCH 06/10.

Indeed, it was already pointed out by Emilio.

> > +	soc@...20000 {
> > +		compatible = "simple-bus";
> > +		#address-cells = <1>;
> > +		#size-cells = <1>;
> > +		reg = <0x01c20000 0x300000>;
> > +		ranges;
> 
> Just curious, what are these reg and ranges properties for?

The fdt parsing code seem to be needing a ranges property, since it
prints a warning if it's not set.

For the reg one, honestly, I don't have a strong argument on this. The
platforms I'm used to did it that way, so did I. The documentation of
simple-bus doesn't seem to mention it, so maybe it's not needed at all.

I find it pretty convenient though to have the size and range where the
different IPs are located in.

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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