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The ISA bus has a different DT nodename on POWER9. Compute the name when the PnvChip is realized, that is before it is used by the machine to populate the device tree with the ISA devices. Signed-off-by: Cédric Le Goater <clg@kaod.org> Message-Id: <20190307223548.20516-6-clg@kaod.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>