Christophe Leroy [off-list ref] writes:

This machine matches two compatibles and sets .pci_irq_fixup
on one of them.

Split it into two machines, then the probe function can be dropped.

That will break the machine initcalls that look for ppc47x:

  arch/powerpc/platforms/44x/ppc476.c:machine_device_initcall(ppc47x, ppc47x_device_probe);
  arch/powerpc/platforms/44x/ppc476.c:machine_arch_initcall(ppc47x, ppc47x_get_board_rev);

It still compiles, because of the weak attribute in machine_is(), but
those initcalls will never match and so never run.

cheers