From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Subject: Re: [PATCH 5/5] arm: dts: Convert mvebu device tree files to 64
 bits
Date: Thu, 21 Mar 2013 20:18:07 +0100
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To: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <robherring2@gmail.com>, Gregory CLEMENT <gregory.clement@free-electrons.com>, Jason Cooper <jason@lakedaemon.net>, Andrew Lunn <andrew@lunn.ch>, Grant Likely <grant.likely@secretlab.ca>, Ezequiel Garcia <ezequiel.garcia@free-electrons.com>, linux-arm-kernel@lists.infradead.org, devicetree-discuss@lists.ozlabs.org, linux-kernel@vger.kernel.org, Olof Johansson <olof@lixom.net>, Nicolas Pitre <nico@fluxnic.net>, Lior Amsalem <alior@marvell.com>, Maen Suleiman <maen@marvell.com>, Tawfik Bayouk <tawfik@marvell.com>, Shadi Ammouri <shadi@marvell.com>, Eran Ben-Avi <benavi@marvell.com>, Yehuda Yitschak <yehuday@marvell.com>, Nadav Haklai <nadavh@marvell.com>, Ike Pan <ike.pan@canonical.com>, Chris Van Hoof <vanhoof@canonical.com>, Dan Frazier <dann.frazier@canonical.com>, Leif Lindholm <leif.lindholm@arm.com>, Jon Masters <jcm@redhat.com>
List-Id: devicetree@vger.kernel.org

Dear Arnd Bergmann,

On Thu, 21 Mar 2013 19:03:52 +0000, Arnd Bergmann wrote:
> On Thursday 21 March 2013, Rob Herring wrote:
> > >       soc {
> > > -             #address-cells = <1>;
> > > -             #size-cells = <1>;
> > > +             #address-cells = <2>;
> > > +             #size-cells = <2>;
> > 
> > If all the addresses for the soc bus are below 4GB or even within a 4GB
> > range if using the ranges property, then changing all this and
> > everything below it is kind of pointless.
> 
> Good point. We'll probably also have to change it all again when we add a new
> binding for that bus in 3.10, so it makes sense to change it only once.

In the mean time can we do something like:

	soc {
		compatible = "simple-bus";
		range = <...>;

		[... all the peripherals ...]
	};

with the range = <...> property converting the peripheral registers
base address (expressed as offsets in the reg = <...> properties of the
subnodes) into the absolute physical address?

I'm planning to work on the DT binding for the mvebu-mbus driver as
soon as the PCIe driver gets accepted, but it would be good to have an
intermediate solution to get the LPAE support in.

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com