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Subject: RE: ARM clock API to PowerPC
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Li Yang-R58472 <LeoLi@freescale.com>
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Date: Fri, 14 Aug 2009 19:29:09 +1000
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Cc: devicetree-discuss@lists.ozlabs.org, John Jacques <john.jacques@lsi.com>,
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On Thu, 2009-08-13 at 16:59 +0800, Li Yang-R58472 wrote:
> >Now, I know there is at least one person on earth 
> >contemplating sharing some drivers between PPC and ARM. I 
> >won't tell much more at this stage, but it makes sense in the 
> >grand scheme of things to see SoC vendors put similar IO cores 
> >into either PPC or ARM and providing that clock API is a good 
> >way to also allow these drivers to work since the drivers in 
> >questions make use of it.
> 
> Freescale USB UDC driver is another example that shared between PowerPC
> and ARM(i.mx).  Currently, the imx part of the driver uses clk API, but
> PowerPC part uses static initialization.  It will be better if we can
> unify the clk setting part of the driver.

I had a look at it looks like it uses the API in a way that would fit
nicely with my plans, ie, it should be possible to use the same driver
on both archs pretty much without changes provided the ppc platform
provides a clock source driver and hooks it up to the device-tree.

I'll work on some proof-of-concept implementation of the core bits
early next week.

Cheers,
Ben.