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This commit adds a very basic registry of msi_chip structures, so that an IRQ controller driver can register an msi_chip, and a PCIe host controller can find it, based on a 'struct device_node'. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>