The MT8195 Infra IOMMU is currently the only Mediatek IOMMU instance that
uses five interrupts instead of one.

Update the binding to allow either one or five interrupts, depending on
the compatible string. This avoids dtbs_check errors on platforms like
the Radxa NIO 12L using the MT8395 SoC:

mediatek/mt8395-radxa-nio-12l.dtb: infra-iommu@10315000: interrupts:
[[0, 795, 4, 0], [0, 796, 4, 0], [0, 797, 4, 0], [0, 798, 4, 0], [0, 799, 4, 0]] is too long

Fixes: 3b5838d1d82e3 ("arm64: dts: mt8195: Add iommu and smi nodes")
Signed-off-by: Julien Massot <julien.massot@collabora.com>
---
 .../devicetree/bindings/iommu/mediatek,iommu.yaml      | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml b/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml
index 75750c64157c868725c087500ac81be4e282c829..5068617a5146c8a8d61234d83c19d2848d5e708f 100644
--- a/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml
+++ b/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml
@@ -97,7 +97,8 @@ properties:
     maxItems: 1
 
   interrupts:
-    maxItems: 1
+    minItems: 1
+    maxItems: 5
 
   clocks:
     items:
@@ -201,6 +202,21 @@ allOf:
       required:
         - mediatek,infracfg
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mediatek,mt8195-iommu-infra
+    then:
+      properties:
+        interrupts:
+          minItems: 5
+    else:
+      properties:
+        interrupts:
+          maxItems: 1
+
   - if: # The IOMMUs don't have larbs.
       not:
         properties:

-- 
2.49.0

On Wed, May 14, 2025 at 10:19:57AM GMT, Julien Massot wrote:
> @@ -97,7 +97,8 @@ properties:
>      maxItems: 1
>  
>    interrupts:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 5
>  
>    clocks:
>      items:
> @@ -201,6 +202,21 @@ allOf:
>        required:
>          - mediatek,infracfg
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - mediatek,mt8195-iommu-infra
> +    then:
> +      properties:
> +        interrupts:
> +          minItems: 5

Instead list the items here and in else:, or in top-level if first
interrupt is the same.

> +    else:
> +      properties:
> +        interrupts:
> +          maxItems: 1

Best regards,
Krzysztof