linux-kernel - Re: [RFC PATCH v2 3/4] powerpc: refactor of_get_cpu

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Message-ID: <6043373.ZgY5Yo1tNM@flatron>
Date:	Sun, 18 Aug 2013 00:22:43 +0200
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Jonas Bonn <jonas@...thpole.se>,
	Michal Simek <monstr@...str.eu>,
	Rob Herring <rob.herring@...xeda.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Grant Likely <grant.likely@...aro.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [RFC PATCH v2 3/4] powerpc: refactor of_get_cpu_node to support other architectures

On Sunday 18 of August 2013 08:09:36 Benjamin Herrenschmidt wrote:
> On Sat, 2013-08-17 at 12:50 +0200, Tomasz Figa wrote:
> > I wonder how would this handle uniprocessor ARM (pre-v7) cores, for
> > which
> > the updated bindings[1] define #address-cells = <0> and so no reg
> > property.
> > 
> > [1] - http://thread.gmane.org/gmane.linux.ports.arm.kernel/260795
> 
> Why did you do that in the binding ? That sounds like looking to create
> problems ...

[Copying Lorenzo...]

I'm not the author of the change. I was just passing by, while the 
question showed up in my mind. ;)

> Traditionally, UP setups just used "0" as the "reg" property on other
> architectures, why do differently ?

Right, especially since the ARM DT topology parsing code still considers a 
device tree without reg property in cpu node invalid.

Best regards,
Tomasz

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