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Add the tiny bit of infrastructure required to use platform MSI instead of the current hack. This means providing a write_msi_msg callback, as well as irq domain and devid retrieval helpers. Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com> Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com> # LX2160ARDB, LS2088ARDB Tested-by: Sascha Bischoff <sascha.bischoff@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Acked-by: Thomas Gleixner <tglx@kernel.org> Link: https://lore.kernel.org/r/20260224100936.3752303-3-maz@kernel.org Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>