Enable Service layer driver for Agilex5

This patch series introduces support for the Agilex5 service layer driver (SVC) in the Linux kernel. The changes span across device tree bindings, platform DTS files, and the Stratix10 SVC firmware driver.

These changes are necessary to enable firmware communication on Agilex5 SoCs via the SVC interface, similar to existing support for Stratix10 and Agilex platforms.

Agilex5 introduces the ability for the TBU to operate in non-secure mode, making it accessible to Linux through the IOMMU framework. This key difference enables improved memory management in non-secure environments. As a result, this series extends the SVC driver and device tree bindings to support IOMMU integration for Agilex5.
---
Notes:
This patch series is applied on socfpga maintainer's tree
https://git.kernel.org/pub/scm/linux/kernel/git/dinguyen/linux.git/log/?h=socfpga_dts_for_v6.19

Changes in v4:
- Refactor the logical check without using AllOf.
Changes in v3:
- Remove driver changes in driver as it is fully compatible
- Add iommu entry and rewrite the git commit message to describe why the changes is required.
Changes in v2:
- Add driver changes for Agilex5-svc compatible
---
Khairul Anuar Romli (2):
dt-bindings: firmware: svc: Add IOMMU support for Agilex5
arm64: dts: intel: Add Agilex5 SVC node with memory region

 .../bindings/firmware/intel,stratix10-svc.yaml       | 12 ++++++++++++
 arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi       |  9 +++++++++
 2 files changed, 21 insertions(+)

2.43.7

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.

---
Changes in v4:
- Fix syntax / style error.
- Refactor code not to use AllOf but instead use if directly.
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

---
 .../bindings/firmware/intel,stratix10-svc.yaml       | 12 ++++++++++++
 1 file changed, 12 insertions(+)

index fac1e955852e..d253943d8f5e 100644
@@ -34,6 +34,7 @@ properties:
     enum:
       - intel,stratix10-svc
       - intel,agilex-svc
+      - intel,agilex5-svc
 
   method:
     description: |

@@ -54,6 +55,9 @@ 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.

@@ -63,6 +67,14 @@ required:
   - method
   - memory-region
 
+if:
+  properties:
+    compatible:
+      const: intel,agilex5-svc
+then:
+  required:
+    - iommus
+
 additionalProperties: false
 
 examples:

2.43.7

Introduce the Stratix10 SoC Service Layer (SVC) node for Agilex5 SoCs. This node includes the compatible string "intel,agilex5-svc" and references a reserved memory region used for communication with the Secure Device Manager (SDM).

Agilex5 introduces changes in how reserved memory is mapped and accessed compared to previous SoC generations, particularly with the addition of IOMMU support. Unlike earlier platforms, Agilex5 enables the use of the Translation Buffer Unit (TBU) in non-secure mode, allowing Linux to access it through the IOMMU framework. This commit updates the device tree structure to support Agilex5-specific handling of the SVC interface, including the necessary bindings for IOMMU integration.

---
Changes in v4:
- Exclude peers reviewers in the sign off.
Changes in v3:
- include iommu property in svc node.
- Rephrase git commit message to describe iommu presence in Agilex5
Changes in v2:
- Rephrase commit message to exclude mentioning iommu

---
 arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi | 9 +++++++++
 arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

index a13ccee3c4c3..15284092897e 100644
@@ -841,5 +841,14 @@ queue7 {
 				};
 			};
 		};
+
+		firmware {
+			svc {
+				compatible = "intel,agilex5-svc";
+				method = "smc";
+				memory-region = <&service_reserved>;
+				iommus = <&smmu 10>;
+			};
+		};
 	};
 };

2.43.7