Re: [PATCH 00/26] STA2X11 devicetree support for amba/pci

From: H. Peter Anvin
Date: Wed Aug 07 2013 - 18:06:41 EST

On 08/07/2013 02:12 PM, Alessandro Rubini wrote:
> I understand. My impression of devicetree is exactly like that, I must
> say. What we have here is a very clean PCI enumeration of it all: we
> only need to specify the mapping of GPIO pins (i.e. card-detect for
> mmc) and DMA channels, as all the rest works by itself.

Could you elucidate this a bit more? Specifically, from the PCI host's
perspective, how do you know what you are dealing with (presumably PCI
VID:DID:SVID:SID?) How exactly does the mapping of PCI BARs and
INT/MSI/MSI-X channels to the slave device play in?

I think it is safe to say that the device models we have today simply
don't account for this kind of usage, which, as you say, is a genuine
problem, and I think we need to understand the problem space better in
order to properly architect the solution, as I don't think we have one
right now.


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