DT/arm,gic-v3: Documment PPI partition support

Add a decription of the PPI partitioning support.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/1460365075-7316-6-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 32 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt b/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt
index 007a5b46256a..4c29cdab0ea5 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt
+++ b/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt
@@ -11,6 +11,8 @@ Main node required properties:
 - interrupt-controller : Identifies the node as an interrupt controller
 - #interrupt-cells : Specifies the number of cells needed to encode an
   interrupt source. Must be a single cell with a value of at least 3.
+  If the system requires describing PPI affinity, then the value must
+  be at least 4.
 
   The 1st cell is the interrupt type; 0 for SPI interrupts, 1 for PPI
   interrupts. Other values are reserved for future use.
@@ -24,7 +26,14 @@ Main node required properties:
                 1 = edge triggered
                 4 = level triggered
 
-  Cells 4 and beyond are reserved for future use and must have a value
+  The 4th cell is a phandle to a node describing a set of CPUs this
+  interrupt is affine to. The interrupt must be a PPI, and the node
+  pointed must be a subnode of the "ppi-partitions" subnode. For
+  interrupt types other than PPI or PPIs that are not partitionned,
+  this cell must be zero. See the "ppi-partitions" node description
+  below.
+
+  Cells 5 and beyond are reserved for future use and must have a value
   of 0 if present.
 
 - reg : Specifies base physical address(s) and size of the GIC
@@ -50,6 +59,11 @@ Optional
 
 Sub-nodes:
 
+PPI affinity can be expressed as a single "ppi-partitions" node,
+containing a set of sub-nodes, each with the following property:
+- affinity: Should be a list of phandles to CPU nodes (as described in
+Documentation/devicetree/bindings/arm/cpus.txt).
+
 GICv3 has one or more Interrupt Translation Services (ITS) that are
 used to route Message Signalled Interrupts (MSI) to the CPUs.
 
@@ -91,7 +105,7 @@ Examples:
 
         gic: interrupt-controller@2c010000 {
                 compatible = "arm,gic-v3";
-                #interrupt-cells = <3>;
+                #interrupt-cells = <4>;
                 #address-cells = <2>;
                 #size-cells = <2>;
                 ranges;
@@ -119,4 +133,20 @@ Examples:
                         #msi-cells = <1>;
                         reg = <0x0 0x2c400000 0 0x200000>;
                 };
+
+                ppi-partitions {
+                        part0: interrupt-partition-0 {
+                                affinity = <&cpu0 &cpu2>;
+                        };
+
+                        part1: interrupt-partition-1 {
+                                affinity = <&cpu1 &cpu3>;
+                        };
+                };
+        };
+
+
+        device@0 {
+                reg = <0 0 0 4>;
+                interrupts = <1 1 4 &part0>;
         };