Re: Associating nodes with phandles for pci devices

[Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>]

On Sunday 08 March 2015 22:01:17 Chris Packham wrote:
> 
> >
> > BTW, one thing that is high in my TODO list regarding DSA is to stop
> > using this platform device/driver architecture and use the actual device
> > driver model. Your switch driver entry point would be a pci_drive
> > probe's function where you end-up registering a switch the DSA. This
> > should solve portions of your problem although this is a long shot as we
> > need to convert existing drivers as well.
> >
> 
> My current problem is that of_find_device_by_node() (called by 
> dsa_of_probe) can't find the device. After a bit of debugging I can see 
> that the populated platform bus only goes as far as 
> /soc/pcie-controller, anything beyond that seems to be missing. I can't 
> see anything obvious in of_platform_bus_create() that would actually 
> stop it from continuing down the pcie-controller branch provided the dts 
> actually enumerates the children.
> 
> Any suggestions?

The PCI devices are not populated by of_platform_bus_create. Instead,
pci_scan_device() calls pci_set_of_node() to set the of_node
pointer for each PCI device.

This would fail for instance if the root bus does not have a correct
of_node pointer.

	Arnd
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