fsl/mpic: Create and document the "single-cpu-affinity" device-tree flag

The Freescale MPIC (and perhaps others in the future) is incapable of
routing non-IPI interrupts to more than once CPU at a time.  Currently
all of the Freescale boards msut pass the MPIC_SINGLE_DEST_CPU flag to
mpic_alloc(), but that information should really be present in the
device-tree.

Older board code can't rely on the device-tree having the property set,
but newer platforms won't need it manually specified in the code.

[BenH: Remove unrelated changes, folded in a different patch]
Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Documentation/devicetree/bindings/powerpc/fsl/mpic.txt

@@ -64,6 +64,12 @@ PROPERTIES
           device-trees omit this property on MPIC nodes even when the MPIC is
           in fact big-endian, so certain boards override this property.
 
+  - single-cpu-affinity
+      Usage: optional
+      Value type: <empty>
+          If present the MPIC will be assumed to only be able to route
+          non-IPI interrupts to a single CPU at a time (EG: Freescale MPIC).
+
 INTERRUPT SPECIFIER DEFINITION
 
   Interrupt specifiers consists of 4 cells encoded as

arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi

@@ -40,6 +40,7 @@ mpic: pic@40000 {
 	compatible = "fsl,mpic";
 	device_type = "open-pic";
 	big-endian;
+	single-cpu-affinity;
 };
 
 timer@41100 {

arch/powerpc/sysdev/mpic.c

@@ -1187,6 +1187,8 @@ struct mpic * __init mpic_alloc(struct device_node *node,
 		flags |= MPIC_BIG_ENDIAN;
 	if (of_get_property(node, "pic-no-reset", NULL))
 		flags |= MPIC_NO_RESET;
+	if (of_get_property(node, "single-cpu-affinity", NULL))
+		flags |= MPIC_SINGLE_DEST_CPU;
 	if (of_device_is_compatible(node, "fsl,mpic"))
 		flags |= MPIC_FSL;