Ah, okay.  Taking a look at that it makes sense now.  Thanks to both of 
you for the help.

Bruce



From:
Bill Gatliff [off-list ref]
To:
Bruce_Leonard@selinc.com
Cc:
David Gibson [off-list ref], linuxppc-dev@lists.ozlabs.org
Date:
02/07/2011 09:13 PM
Subject:
Re: Question on supporting multiple HW versions with a single driver 
(warning: long post)



Guys:


I think the Silicon Motion SM501 driver might provide a useful
example, since the chip comes in both memory-mapped and PCI versions.
Unfortunately the chip is implemented as a multi-function driver
(mfd), so the code is not un-complicated.  Still fairly
straightforward and well-written once you learn your way around it,
though.

Basically, it implements a core set of functionality to talk to the
actual chip registers, which is bus-agnostic.  Then the bus-specific
drivers use these functions when they actually want to touch the chip
itself.  In other words, exactly what David suggested.


b.g.


On Mon, Feb 7, 2011 at 8:37 PM,  [off-list ref] wrote:

quoted

There are a number of drivers which already have this sort of dual bus
binding.

Thanks for the feedback David, I appreciate it.  Could you point me to 

one

of those drivers that has "this sort of dual bus binding" so can see an
example of what I'm trying to do?

Bruce
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Bill Gatliff
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