linux-kernel - [PATCH v3 1/2] dt-bindings: firmware: svc: Add IOMMU support for Agilex5

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Message-ID: <ca75b88a64412274d415e17d4aef6dd018ac7167.1762135710.git.khairul.anuar.romli@altera.com>
Date: Tue,  4 Nov 2025 07:39:27 +0800
From: Khairul Anuar Romli <khairul.anuar.romli@...era.com>
To: Dinh Nguyen <dinguyen@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Mahesh Rao <mahesh.rao@...era.com>,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>,
	Niravkumar L Rabara <niravkumarlaxmidas.rabara@...era.com>,
	Khairul Anuar Romli <khairul.anuar.romli@...era.com>
Subject: [PATCH v3 1/2] dt-bindings: firmware: svc: Add IOMMU support for Agilex5

In Agilex5, the TBU (Translation Buffer Unit) can now operate in non-secure
mode, enabling Linux to utilize it through the IOMMU framework. This allows
improved memory management capabilities in non-secure environments. With
Agilex5 lifting this restriction, we are now extending the device tree
bindings to support IOMMU for the Agilex5 SVC.

Signed-off-by: Khairul Anuar Romli <khairul.anuar.romli@...era.com>
Reviewed-by: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>
Reviewed-by: Niravkumar L Rabara <niravkumarlaxmidas.rabara@...era.com>
---
Changes in v3:
	- Add iommu property.
	- Add logical check where only Agilex5 required iommus
	- Rewrite the commit message to explain why this changes is 
	  needed.
Changes in v2:
	- Reprase commit message to exclude iommu
---
 .../firmware/intel,stratix10-svc.yaml         | 20 +++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/firmware/intel,stratix10-svc.yaml b/Documentation/devicetree/bindings/firmware/intel,stratix10-svc.yaml
index fac1e955852e..094973494098 100644
--- a/Documentation/devicetree/bindings/firmware/intel,stratix10-svc.yaml
+++ b/Documentation/devicetree/bindings/firmware/intel,stratix10-svc.yaml
@@ -34,6 +34,7 @@ properties:
     enum:
       - intel,stratix10-svc
       - intel,agilex-svc
+      - intel,agilex5-svc
 
   method:
     description: |
@@ -54,14 +55,25 @@ properties:
       reserved memory region for the service layer driver to
       communicate with the secure device manager.
 
+  iommus:
+    maxItems: 1
+
   fpga-mgr:
     $ref: /schemas/fpga/intel,stratix10-soc-fpga-mgr.yaml
     description: Optional child node for fpga manager to perform fabric configuration.
 
-required:
-  - compatible
-  - method
-  - memory-region
+allOf:
+  - required:
+      - compatible
+      - method
+      - memory-region
+  - if:
+      properties:
+        compatible:
+          const: intel,agilex5-svc
+    then:
+      required:
+        - iommus
 
 additionalProperties: false
 
-- 
2.43.7