linux-kernel - [PATCH V2 2/3] dt-bindings: iommu: Add NVIDIA Tegra CMDQV support

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Message-ID: <20251125071659.3048659-3-amhetre@nvidia.com>
Date: Tue, 25 Nov 2025 07:16:58 +0000
From: Ashish Mhetre <amhetre@...dia.com>
To: <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>,
	<robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
	<nicolinc@...dia.com>
CC: <thierry.reding@...il.com>, <jonathanh@...dia.com>, <vdumpa@...dia.com>,
	<jgg@...pe.ca>, <linux-arm-kernel@...ts.infradead.org>,
	<iommu@...ts.linux.dev>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>, Ashish Mhetre
	<amhetre@...dia.com>
Subject: [PATCH V2 2/3] dt-bindings: iommu: Add NVIDIA Tegra CMDQV support

The Command Queue Virtualization (CMDQV) hardware is part of the
SMMUv3 implementation on NVIDIA Tegra SoCs. It assists in
virtualizing the command queue for the SMMU.

Add a new device tree binding document for nvidia,tegra264-cmdqv.

Also update the arm,smmu-v3 binding to include an optional nvidia,cmdqv
property. This property is a phandle to the CMDQV device node, allowing
the SMMU driver to associate with its corresponding CMDQV instance.
Restrict this property usage to Nvidia Tegra264 only.

Signed-off-by: Ashish Mhetre <amhetre@...dia.com>
---
 .../bindings/iommu/arm,smmu-v3.yaml           | 30 ++++++++++++-
 .../bindings/iommu/nvidia,tegra264-cmdqv.yaml | 42 +++++++++++++++++++
 2 files changed, 70 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/iommu/nvidia,tegra264-cmdqv.yaml

diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml
index 75fcf4cb52d9..1c03482e4c61 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml
@@ -20,7 +20,12 @@ properties:
   $nodename:
     pattern: "^iommu@[0-9a-f]*"
   compatible:
-    const: arm,smmu-v3
+    oneOf:
+      - const: arm,smmu-v3
+      - items:
+          - enum:
+              - nvidia,tegra264-smmu
+          - const: arm,smmu-v3
 
   reg:
     maxItems: 1
@@ -58,6 +63,15 @@ properties:
 
   msi-parent: true
 
+  nvidia,cmdqv:
+    description: |
+      A phandle to its pairing CMDQV extension for an implementation on NVIDIA
+      Tegra SoC.
+
+      If this property is absent, CMDQ-Virtualization won't be used and SMMU
+      will only use its own CMDQ.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
   hisilicon,broken-prefetch-cmd:
     type: boolean
     description: Avoid sending CMD_PREFETCH_* commands to the SMMU.
@@ -69,6 +83,17 @@ properties:
       register access with page 0 offsets. Set for Cavium ThunderX2 silicon that
       doesn't support SMMU page1 register space.
 
+allOf:
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              const: nvidia,tegra264-smmu
+    then:
+      properties:
+        nvidia,cmdqv: false
+
 required:
   - compatible
   - reg
@@ -82,7 +107,7 @@ examples:
     #include <dt-bindings/interrupt-controller/irq.h>
 
     iommu@...00000 {
-            compatible = "arm,smmu-v3";
+            compatible = "nvidia,tegra264-smmu", "arm,smmu-v3";
             reg = <0x2b400000 0x20000>;
             interrupts = <GIC_SPI 74 IRQ_TYPE_EDGE_RISING>,
                          <GIC_SPI 75 IRQ_TYPE_EDGE_RISING>,
@@ -92,4 +117,5 @@ examples:
             dma-coherent;
             #iommu-cells = <1>;
             msi-parent = <&its 0xff0000>;
+            nvidia,cmdqv = <&cmdqv>;
     };
diff --git a/Documentation/devicetree/bindings/iommu/nvidia,tegra264-cmdqv.yaml b/Documentation/devicetree/bindings/iommu/nvidia,tegra264-cmdqv.yaml
new file mode 100644
index 000000000000..3f5006a59805
--- /dev/null
+++ b/Documentation/devicetree/bindings/iommu/nvidia,tegra264-cmdqv.yaml
@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iommu/nvidia,tegra264-cmdqv.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra264 CMDQV
+
+description:
+  The CMDQ-Virtualization hardware block is part of the SMMUv3 implementation
+  on Tegra264 SoCs. It assists in virtualizing the command queue for the SMMU.
+
+maintainers:
+  - Nicolin Chen <nicolinc@...dia.com>
+
+properties:
+  compatible:
+    const: nvidia,tegra264-cmdqv
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    cmdqv@...0000 {
+            compatible = "nvidia,tegra264-cmdqv";
+            reg = <0x5200000 0x830000>;
+            interrupts = <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>;
+    };
-- 
2.25.1