linux-kernel - [PATCH v2 1/2] dt-bindings: iommu: rockchip: Add support for multiple interface clocks

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Message-Id: <20251128071322.92-2-kernel@airkyi.com>
Date: Fri, 28 Nov 2025 15:13:21 +0800
From: Chaoyi Chen <kernel@...kyi.com>
To: Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>
Cc: iommu@...ts.linux.dev,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Chaoyi Chen <chaoyi.chen@...k-chips.com>
Subject: [PATCH v2 1/2] dt-bindings: iommu: rockchip: Add support for multiple interface clocks

From: Chaoyi Chen <chaoyi.chen@...k-chips.com>

The iommu found on RK3576 NPU and RK3576 RKVDEC have 4 clock instead of
2 clock. Their clock names might differ, but I don't think that matters
much.

Add support for them.

Signed-off-by: Chaoyi Chen <chaoyi.chen@...k-chips.com>
---

Changes in v2:
- Rewrite dt binding.

 .../bindings/iommu/rockchip,iommu.yaml        | 52 ++++++++++++++++---
 1 file changed, 46 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml b/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
index 6ce41d11ff5e..dfa5e25476d9 100644
--- a/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
+++ b/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
@@ -27,6 +27,8 @@ properties:
           - enum:
               - rockchip,rk3576-iommu
               - rockchip,rk3588-iommu
+              - rockchip,rk3576-npu-iommu
+              - rockchip,rk3576-rkvdec-iommu
           - const: rockchip,rk3568-iommu
 
   reg:
@@ -42,14 +44,12 @@ properties:
     minItems: 1
 
   clocks:
-    items:
-      - description: Core clock
-      - description: Interface clock
+    minItems: 2
+    maxItems: 4
 
   clock-names:
-    items:
-      - const: aclk
-      - const: iface
+    minItems: 2
+    maxItems: 4
 
   "#iommu-cells":
     const: 0
@@ -64,6 +64,46 @@ properties:
       Some mmu instances may produce unexpected results
       when the reset operation is used.
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - rockchip,rk3576-npu-iommu
+              - rockchip,rk3576-rkvdec-iommu
+    then:
+      properties:
+        clocks:
+          minItems: 4
+        clock-names:
+          minItems: 4
+  - if:
+      properties:
+        compatible:
+          items:
+            - const: rockchip,iommu
+            - const: rockchip,rk3568-iommu
+    then:
+      properties:
+        clocks:
+          maxItems: 2
+        clock-names:
+          maxItems: 2
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - rockchip,rk3576-iommu
+              - rockchip,rk3588-iommu
+    then:
+      properties:
+        clocks:
+          maxItems: 2
+        clock-names:
+          maxItems: 2
+
 required:
   - compatible
   - reg
-- 
2.51.1