linux-kernel - [PATCH v2 2/3] dt-bindings: iommu: mediatek: Support 5 IRQs on MT8195 infra IOMMU

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Message-Id: <20250514-mt8395-dtb-errors-v2-2-d67b9077c59a@collabora.com>
Date: Wed, 14 May 2025 10:19:57 +0200
From: Julien Massot <julien.massot@...labora.com>
To: kernel@...labora.com, Sen Chu <sen.chu@...iatek.com>, 
 Sean Wang <sean.wang@...iatek.com>, Macpaul Lin <macpaul.lin@...iatek.com>, 
 Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>, 
 Hui Liu <hui.liu@...iatek.com>, Yong Wu <yong.wu@...iatek.com>, 
 Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, 
 Robin Murphy <robin.murphy@....com>, 
 Tinghan Shen <tinghan.shen@...iatek.com>
Cc: linux-pm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, iommu@...ts.linux.dev, 
 Julien Massot <julien.massot@...labora.com>
Subject: [PATCH v2 2/3] dt-bindings: iommu: mediatek: Support 5 IRQs on
 MT8195 infra IOMMU

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@...15000: 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@...labora.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