Re: [PATCH 6/6 v4] ARM: realview: basic device tree implementation

[Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>]

On Monday 01 September 2014 13:03:13 Russell King - ARM Linux wrote:
> On Fri, Jul 25, 2014 at 05:58:24PM +0200, Arnd Bergmann wrote:
> > On Friday 25 July 2014 16:50:10 Russell King - ARM Linux wrote:
> > > 
> > > I toyed with the idea of adding the standard cache size specifications
> > > to the L2C code, it sounds like there's a reason to do that now.
> > > 
> > > Let's not mess around with adding stuff like the above to work around
> > > the L2 code not parsing the appropriate specs from DT, let's do the
> > > right thing and add bindings to allow DT to provide the cache geometry.
> > 
> > Yes, please!
> > 
> > That would actually reduce the realview to just the dma_zone_size
> > definition, and I think someone also posted a patch to get that from
> > DT recently. Having realview booting with an empty board file would
> > be ideal.
> 
> I did have a patch in my L2C cleanup series to provide these properties,
> but it got discarded - even though we have existing platforms which
> provide these values.
> 
> The reason for that was because requiring new properties causes a DT
> breakage - previous versions of the DT suddenly stop working because
> the values necessary to setup the L2C have been removed from the
> kernel, and the older DT files do not contain the neccessary values
> either.

But in case of realview or any other platform that does not have
mainline DT support, nothing would break. There is no need to remove
the settings from the kernel, I would just prefer not to add any
other ones.

	Arnd
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