[PATCH 24/32] pci: PCIe driver for Marvell Armada 370/XP systems

[Jason Gunthorpe]

On Fri, Mar 08, 2013 at 08:14:44AM +0100, Thierry Reding wrote:
> On Thu, Mar 07, 2013 at 06:05:33PM -0600, Rob Herring wrote:
> > On 03/07/2013 02:47 PM, Thierry Reding wrote:
> [...]
> > > In a nutshell (since some of the context isn't quoted anymore) the
> > > problem that we're trying to solve is that some of the embedded SoCs
> > > require per-root-port registers for configuration. The PCI DT
> > > specification doesn't make any provisions for this. A few alternatives
> > > have been discussed so far:
> > 
> > I'm not sure I follow. This is different than the host controller
> > registers? Why would this not just be multiple entries in the reg property?
> 
> Well the register regions are per root-port. On Tegra20 there's 2 of
> them, Tegra30 has 3 and if I understand correctly Marvell can have up to
> 10 (!). Adding all of them to the reg property of the host controller
> could work but it needs some way to match the reg entry to the root port
> similar to option 1 below.

Thomas just posted an implementation like this, please see:

http://www.spinics.net/lists/arm-kernel/msg228749.html

Jason