dt-bindings: iommu: arm,smmu-v3: make PRI IRQ optional

Andre-ARM · robherring · commit e4783856a2e8 · 2022-05-09T11:03:48.000-05:00
The Page Request Interface (PRI) is an optional PCIe feature. As such, a SMMU would not need to handle it if the PCIe host bridge or the SMMU itself do not implement it. Also an SMMU could be connected to a platform device, without any PRI functionality whatsoever. In all cases there would be no SMMU PRI queue interrupt to be wired up to an interrupt controller. At the moment, with the "eventq,gerror,priq,cmdq-sync" order, we would need to sacrifice the command queue sync interrupt as well, which might not be desired. Relax the binding to allow specifying certain useful combinations of wired interrupts, for instance just the "gerror" interrupt, or omitting both "pri" and "cmdq-sync". Signed-off-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20220506140533.3566431-2-andre.przywara@arm.com
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml
@@ -37,12 +37,18 @@ properties:
           hardware supports just a single, combined interrupt line.
           If provided, then the combined interrupt will be used in preference to
           any others.
-      - minItems: 2
+      - minItems: 1
         items:
-          - const: eventq     # Event Queue not empty
-          - const: gerror     # Global Error activated
-          - const: priq       # PRI Queue not empty
-          - const: cmdq-sync  # CMD_SYNC complete
+          - enum:
+              - eventq     # Event Queue not empty
+              - gerror     # Global Error activated
+          - const: gerror
+          - enum:
+              - cmdq-sync  # CMD_SYNC complete
+              - priq       # PRI Queue not empty
+          - enum:
+              - cmdq-sync
+              - priq
 
   '#iommu-cells':
     const: 1
