linux-kernel - Re: [PATCH 0/4] Introducing Exynos ChipId driver

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Date:	Mon, 05 May 2014 17:01:53 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Pankaj Dubey <pankaj.dubey@...sung.com>, kgene.kim@...sung.com,
	linux@....linux.org.uk, t.figa@...sung.com,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 0/4] Introducing Exynos ChipId driver

On Monday 05 May 2014 16:58:14 Arnd Bergmann wrote:
> > Also for platsmp.c and pm.c I can think of following approaches
> > 1: Keep these macros till we get generic solution?
> > 2: Allow chipid driver to expose APIs to check SoC id and SoC revisions 
> > till we get
> > generic solution. So that at least we can remove #ifdef  based macros
> > as soc_is_exynosXYZ.
> > 3: Use of "of_flat_dt_is_compatible" or similar APIs in these machine files 
> > till we get
> > generic solution. For some cases where we want to know SoC revision let us
> > map chipid register and get revision there itself.
> > 
> > Please let me know what approach you think will be good?
> 
> I think 1 or 2 would be better than 3. Between those two, I'm undecided,
> but I think either way the SoC specific values would be better kept in the
> mach-samsung directory than in plat/cpu.h or linux/exynos-chipid.h.

Actually, a good compromise for now would be to add the chipid driver
to mach-exynos instead of drivers/bus. This way you can keep the uses
of the ID local to the exynos platform code until it's no longer needed.
Then it can get moved out to drivers/soc to be shared with arm64.

	Arnd
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