Re: [PATCH v7 1/6] pci: Introduce pci_register_io_range() helper function.

[Rob Herring]

On 06/27/2014 07:49 AM, Will Deacon wrote:
> On Fri, Jun 27, 2014 at 12:03:34PM +0100, Arnd Bergmann wrote:
>> On Thursday 26 June 2014 19:44:21 Rob Herring wrote:
>>> I don't agree arm32 is harder than microblaze. Yes, converting ALL of
>>> arm would be, but that is not necessary. With Liviu's latest branch
>>> the hacks I previously needed are gone (thanks!), and this is all I
>>> need to get Versatile PCI working (under QEMU):
>>
>> I meant converting all of arm32 would be harder, but I agree we don't
>> have to do it. It would be nice to convert all of the drivers/pci/host
>> drivers though, iow all multiplatform-enabled ones, and leaving the
>> current arm32 pci implementation for the platforms we don't want to
>> convert to multiplatform anyway (footbridge, iop, ixp4xx, ks8695 (?),
>> pxa, sa1100).
> 
> I'm more than happy to convert the generic host controller we merged
> recently, but I'd probably want the core changes merged first so that I
> know I'm not wasting my time!

Something like this untested patch...

Another issue I found still present is pci_ioremap_io needs some work 
to unify with the arm implementation. That's a matter of changing the 
function from an offset to i/o resource. That should be a pretty 
mechanical change.

Also, there is a potential for memory leak because there is no undo 
for of_create_pci_host_bridge.

Rob

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