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powerpc/mpic: Add "last-interrupt-source" property to override hardware

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The FreeScale PowerQUICC-III-compatible (mpc85xx/mpc86xx) MPICs do not
correctly report the number of hardware interrupt sources, so software
needs to override the detected value with "256".

To avoid needing to write custom board-specific code to detect that
scenario, allow it to be easily overridden in the device-tree.

Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Kyle Moffett
2011-12-22 10:19:13 +00:00
committed by Benjamin Herrenschmidt
parent 5019609fce
commit c1b8d45db4
3 changed files with 34 additions and 20 deletions
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arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi
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@@ -41,6 +41,7 @@ mpic: pic@40000 {
device_type = "open-pic";
big-endian;
single-cpu-affinity;
last-interrupt-source = <255>;
};
timer@41100 {