On Thu, Mar 10, 2011 at 05:11:59PM +0100, Arnd Bergmann wrote:

On Thursday 10 March 2011, Mark Brown wrote:

quoted

You could, though the bus will just be a noop.  Typically it's more than
one bus but software basically can't tell.

Yes. The main reason for representing such a bus in sysfs would be
to match the SOC's block diagram with the structure in the kernel.

If you're doing that things like power domains tend to be a lot more
interesting since you can do something meaningful with them in software.
The non-visible buses aren't reliably documented anyway and the first
procesor datasheet I just pulled up had a whole bunch of devices that
span multiple buses anyway :)