linux-kernel - Re: [PATCH 5/5] arm: dts: Convert mvebu device tree files to 64 bits

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Date:	Thu, 21 Mar 2013 20:18:07 +0100
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Rob Herring <robherring2@...il.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Grant Likely <grant.likely@...retlab.ca>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Olof Johansson <olof@...om.net>,
	Nicolas Pitre <nico@...xnic.net>,
	Lior Amsalem <alior@...vell.com>,
	Maen Suleiman <maen@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Shadi Ammouri <shadi@...vell.com>,
	"Eran Ben-Avi" <benavi@...vell.com>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Ike Pan <ike.pan@...onical.com>,
	Chris Van Hoof <vanhoof@...onical.com>,
	Dan Frazier <dann.frazier@...onical.com>,
	Leif Lindholm <leif.lindholm@....com>,
	Jon Masters <jcm@...hat.com>,
	David Marlin <dmarlin@...hat.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH 5/5] arm: dts: Convert mvebu device tree files to 64
 bits

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
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