linux-kernel - Re: [PATCH] of: When constructing the bus id consider assigned-addresses as well

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Date:	Fri, 30 Nov 2012 09:48:05 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH] of: When constructing the bus id consider assigned-addresses as well

On Thu, 29 Nov 2012 12:38:29 -0700, Jason Gunthorpe <jgunthorpe@...idianresearch.com> wrote:
> On Thu, Nov 29, 2012 at 04:26:48PM +0000, Grant Likely wrote:
> 
> > Hmmm. okay that makes sense, but something still isn't quite right. So
> > of_translate_address should take care of drilling down through the bus
> > layers, and when it gets to the PCI node it /should/ use
> > of_bus_pci_translate to handle traversing down to the parent node (which
> > uses the 'assigned-addresses' for the pci node.
> 
> The address translation machinery requires PCI format addresses (ie
> address-cells=3) for all nodes below a PCI bus. Part of this
> requirement is that 'assigned-addresses' is used for resources, *not*
> 'reg'.
> 
> If you attempt to stick a 'reg' in a block nested below a
> 'device_type="pci"' the kernel throws lots of error messsages and
> generates bad address mappings.

Have you added the appropriate #address-cells and #size-cells to the pci
device node to go back to a non-pci addressing mode? assigned-addresses
only makes sense in the pci-device node itself. reg should work for all
nodes below that, and if it doesn't then it is a bug that we need to
fix.

g.
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