[PATCH] mtd: nand: davinci: Add cpufreq support

Nori, Sekhar nsekhar at ti.com
Tue Aug 2 12:00:07 EDT 2011

Hi Ben,

On Tue, Aug 02, 2011 at 18:32:39, Ben Gardiner wrote:
> Hi Sudhakar,
> On Thu, Jul 21, 2011 at 5:39 AM, Rajashekhara, Sudhakar
> <sudhakar.raj at ti.com> wrote:
> > This patch adds cpufreq support for NAND driver. During cpufreq
> > transition, 'davinci_aemif_setup_timing()' function will be called
> > to reconfigure that AEMIF timings for the new frequency.
> I can see that this will work fine for dacinci_nand -- and it is a
> welcomed feature also -- thank you for the effort to push this
> upstream.
> Seeing this support added directly to davinci_nand driver made me
> think -- now this driver has another reference to platform-specific
> functions in arch/arm/mach-davinci/aemif.c. Recently the c6x project
> pushed a fix to remove references to a platform specific include. Not
> that you are re-introducing this include but in a more general sense:
> perhaps the features/functions of the AEMIF _bus_ should be removed
> from the davinci_nand driver?

Good point! arch/arm/mach-davinci/aemif.c should be moved to drivers/
Because AEMIF is present on C6x and OMAP architectures as well and
not limited to DaVinci.

I am not sure if there are any existing "memory interface" drivers.
Moving to drivers/misc/ may be a good point to start.

Making AEMIF a new bus type is an interesting idea as well.


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