MIPS: Netlogic: Avoid using fixed PIC IRT index
The index for a device interrupt in the PIC interrupt routing table changes for different chips in the XLP family. Avoid using the fixed entries and derive the index value from the SoC device header. Add workarounds for some devices which do not report the IRT index correctly. Signed-off-by: NJayachandran C <jchandra@broadcom.com> Patchwork: http://patchwork.linux-mips.org/patch/5025/Acked-by: NJohn Crispin <blogic@openwrt.org>
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