Bus/driver registration

[Adrian M. <ad...@ne...>]

Sorry for the generality of this, but I haven't been able to google this
one...

I have got a maple bus driver for the Dreamcast that is about 80% there
- though it still has some hotplugging issues to be sorted.

The driver resides in drivers/sh/maple

To test it further I have now ported the old maple keyboard driver over
to work with the new bus driver.

This lives in drivers/input/keyboard

The driver causes an oops when being initialised as a built in - because
afaics the chain goes:

driver_register -> bus_add_driver -> get_bus when, because the maple bus
has not yet been registered with the system a NULL is returned and an
oops is thrown (incidentally it looks like there is a bug in
bus_add_driver as it returns a 0 and not an error in this case).

So, how do I ensure the bus gets registered before the driver?

(I could try using the keyboard driver as a module but the hotplugging
issues get in the way here atm)