On Tue, Mar 18, 2014 at 02:15:19PM -0600, Jason Gunthorpe wrote:
> On Tue, Mar 18, 2014 at 01:02:55PM -0700, Tim Harvey wrote:
> > > Is this whole bridge/switch hierarchy binding documented somewhere
> > > or is this just something that work for you?
> >
> > I'm not sure where its 'best' documented, but it is the way the
> > kernel works.
>
> It is documented in the 'PCI Bus Binding to Open Firware'
> publication from IEEE.
>
> > >> + pcie@0,0 {
> > >> + /* 01:00.0 PCIe switch */
> > >> + #address-cells = <3>;
> > >> + #size-cells = <2>;
> > >> + device_type = "pci";
> > >> + reg = <0x0 0 0 0 0>;
> > >> +
> > >> + pcie@8,0 {
> > >
> > > What's the naming schema for all these pcie nodes? Generally, we should
> > > have the numbers encoded in the node name coming from the address cells
> > > in 'reg' property.
>
> The 'reg' property for PCI encodes the device and function number, and
> the suffix in the device path is of the form @DEVICE,FUNCTION (see
> 2.2.1.3 of the spec)
>
> So device=8, function=0 is @8,0 and reg = 0x4000.
Ok, thanks for the info. I missed the fact the pointer to the spec has
been there in Documentation/devicetree/bindings/pci/pci.txt.
Shawn
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