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>
diff --git a/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt b/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
index ebafba2..b393ccf 100644
--- a/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
+++ b/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
@@ -64,6 +64,12 @@
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
diff --git a/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi b/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi
index 47f2b67..658bd81 100644
--- a/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi
+++ b/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi
@@ -40,6 +40,7 @@
compatible = "fsl,mpic";
device_type = "open-pic";
big-endian;
+ single-cpu-affinity;
};
timer@41100 {
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 9deec44..c297a52 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -1187,6 +1187,8 @@
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;