Re: [PATCH v2 10/23] ARM: MM: Add DT binding for Feroceon L2 cache

[Andrew Lunn <andrew-g2DYL2Zd6BY@public.gmane.org>]

On Sat, Feb 15, 2014 at 02:23:23PM +0100, Arnd Bergmann wrote:
> On Saturday 15 February 2014 11:20:08 Andrew Lunn wrote:
> > Instantiate the L2 cache from DT. Indicate in DT where the cache
> > control register is and if write through should be made.
> > 
> > Signed-off-by: Andrew Lunn <andrew-g2DYL2Zd6BY@public.gmane.org>
> > cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> > 
> 
> I guess this answers part of my question for patch 5, but I also
> wonder if the run-time setting is correct now with the hardcoded
> #ifdef in arch/arm/mm/proc-feroceon.S checkign for the
> Kconfig option. Presumably the code should match whatever is
> set in the cache control register.

Humm, yes, good point.

None of the _defconfig's ever turn on
CACHE_FEROCEON_L2_WRITETHROUGH. I also did a quick google and could
not find any usage of it.

So i see two options:

1) Remove the wr-override from the DT binding and use
CACHE_FEROCEON_L2_WRITETHROUGH.

2) Remove CACHE_FEROCEON_L2_WRITETHROUGH and make proc-feroceon.S do
the right thing at runtime.

I suspect i will go for 1), it is simpler.

  Thanks
	Andrew


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