dt-bindings: iommu: qcom,iommu: Add QSMMUv2 and MSM8976 compatibles

Add compatible string "qcom,msm-iommu-v2" for the inner node,
along with "qcom,msm8976-iommu" as a first user of it and
"qcom,msm-iommu-v2-ns" and "qcom,msm-iommu-v2-sec" for the context
bank nodes to support Qualcomm's secure fw "SMMU v2" implementation.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230622092742.74819-6-angelogioacchino.delregno@collabora.com
Signed-off-by: Will Deacon <will@kernel.org>

Documentation/devicetree/bindings/iommu/qcom,iommu.yaml

@@ -17,11 +17,16 @@ description: |
 
 properties:
   compatible:
-    items:
-      - enum:
-          - qcom,msm8916-iommu
-          - qcom,msm8953-iommu
-      - const: qcom,msm-iommu-v1
+    oneOf:
+      - items:
+          - enum:
+              - qcom,msm8916-iommu
+              - qcom,msm8953-iommu
+          - const: qcom,msm-iommu-v1
+      - items:
+          - enum:
+              - qcom,msm8976-iommu
+          - const: qcom,msm-iommu-v2
 
   clocks:
     items:
@@ -64,6 +69,8 @@ patternProperties:
         enum:
           - qcom,msm-iommu-v1-ns
           - qcom,msm-iommu-v1-sec
+          - qcom,msm-iommu-v2-ns
+          - qcom,msm-iommu-v2-sec
 
       interrupts:
         maxItems: 1