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|1. How do I locate all usb nodes in the device tree?
|
|2. How do I know if a particular usb node is OHCI?

You look for compatible "usb-ohci".

But this doesn't help you.  You do not know yet if the
problem happens for all usb-ohci; for example, it could be
that you have the console output device on usb; or as another
example, it could be that this firmware leaves all pci devices
in some active state.

So as I see it you have only two options:

1) Figure out what exactly is going on;
or 2) make the kernel shut down all pci devices early (either
in actual kernel code, or in an OF boot script).

The big question that I'm still stumbling over is how to access the device
registers. The "reg" property looks like this:

You should look at "assigned-addresses", not "reg".  Well,
you first need to look at "reg" to figure out what entry
in "assigned-addresses" to use.


Segher