linux-kernel - Re: Proposal to move PCI out of arch/powerpc and into drivers/of

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Date:	Sun, 28 Feb 2010 11:32:06 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	John Linn <John.Linn@...inx.com>
Cc:	linux-kernel@...r.kernel.org, devicetree-discuss@...abs.org,
	linuxppc-dev@...abs.org, microblaze-uclinux@...e.uq.edu.au,
	grant.likely@...retlab.ca,
	John Williams <john.williams@...alogix.com>,
	michal.simek@...alogix.com
Subject: Re: Proposal to move PCI out of arch/powerpc and into drivers/of

On Fri, 2010-02-26 at 16:07 -0700, John Linn wrote:
> Hi all,
> 
> We are in the process of putting PCI/PCIe into the microblaze
> architecture.  
> 
> In order to not duplicate/fork the PCI code in Powerpc, we're proposing
> to move the PCI code from arch/powerpc into drivers/of such that it
> would be common code for Powerpc and MicroBlaze.
> 
> This would be the 1st part of a refactoring that would occur with the
> PCI code.
> 
> Ben H., would you mind if that happened (move arch/powerpc/kernel/pci*
> to drivers/of/*)?

I don't think we should move the whole thing. I know Grant plans to move
parts of it though. There's quite a few things in there that are still
quite powerpc specific (and even different between ppc32 and ppc64).

I wouldn't mind in the long run if we could make some of powerpc's PCI
implementation bits more generic, such as struct pci_controller, and the
MMIO/PIO remapping mechanisms, since many archs do more or less the same
thing and all in subtely different ways. But that would have to go to
drivers/pci.

Then there's the whole deal with matching OF nodes with PCI devices. A
lot of that is still different even between ppc32 and ppc64. I don't
think any of that is ready to be moved to drivers/of, it's not generic
enough by far.

Cheers,
Ben.

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