# \[PATCH v3 03/10\] dt-bindings: apple, aic: Add affinity description for per-cpu pseudo-interrupts

- From: Marc Zyngier \<maz@kernel.org\>
- Date: 2021-12-14 18:27:34 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/12/1608533
- Thread: https://ratatoskr.run/linux-arm-kernel/2021/12/1608529/t.md

```text
Some of the FIQ per-cpu pseudo-interrupts are better described with
a specific affinity, the most obvious candidate being the CPU PMUs.

Augment the AIC binding to be able to specify that affinity in the
interrupt controller node.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 .../interrupt-controller/apple,aic.yaml       | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml b/Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
index b95e41816953..ac1c82cffa0a 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
+++ b/Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
@@ -67,6 +67,32 @@ properties:
       Specifies base physical address and size of the AIC registers.
     maxItems: 1
 
+  affinities:
+    type: object
+    description:
+      FIQ affinity can be expressed as a single "affinities" node,
+      containing a set of sub-nodes, one per FIQ with a non-default
+      affinity.
+    patternProperties:
+      "^.+-affinity$":
+        type: object
+        properties:
+          fiq-index:
+            description:
+              The interrupt number specified as a FIQ, and for which
+              the affinity is not the default.
+            $ref: /schemas/types.yaml#/definitions/uint32
+            maximum: 5
+          affinity:
+            $ref: /schemas/types.yaml#/definitions/phandle-array
+            description:
+              Should be a list of phandles to CPU nodes (as described in
+              Documentation/devicetree/bindings/arm/cpus.yaml).
+
+        required:
+          - fiq-index
+          - affinity
+
 required:
   - compatible
   - '#interrupt-cells'
-- 
2.30.2


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```