ARM: gic: add irq_domain support
Convert the gic interrupt controller to use irq domains in preparation for device-tree binding and MULTI_IRQ. This allows for translation between GIC interrupt IDs and Linux irq numbers. The meaning of irq_offset has changed. It now is just the number of skipped GIC interrupt IDs for the controller. It will be 16 for primary GIC and 32 for secondary GICs. Signed-off-by: NRob Herring <rob.herring@calxeda.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: NJamie Iles <jamie@jamieiles.com> Tested-by: NThomas Abraham <thomas.abraham@linaro.org> Acked-by: NGrant Likely <grant.likely@secretlab.ca>
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