linux-kernel - [PATCH v2 1/3] dt-bindings: interconnect: add reg and clocks properties to enable QoS on sa8775p

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Message-Id: <20251001073344.6599-2-odelu.kukatla@oss.qualcomm.com>
Date: Wed,  1 Oct 2025 13:03:42 +0530
From: Odelu Kukatla <odelu.kukatla@....qualcomm.com>
To: Georgi Djakov <djakov@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: Raviteja Laggyshetty <raviteja.laggyshetty@....qualcomm.com>,
        Odelu Kukatla <odelu.kukatla@....qualcomm.com>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mike Tipton <mike.tipton@....qualcomm.com>
Subject: [PATCH v2 1/3] dt-bindings: interconnect: add reg and clocks properties to enable QoS on sa8775p

Add 'reg' and 'clocks' properties to enable QoS configuration. These
properties enable access to QoS registers and necessary clocks for
configuration.

QoS configuration is essential for ensuring that latency sensitive
components such as CPUs and multimedia engines receive prioritized
access to memory and interconnect resources. This helps to manage
bandwidth and latency across subsystems, improving system responsiveness
and performance in concurrent workloads.

Both 'reg' and 'clocks' properties are optional. If either is missing,
QoS configuration will be skipped. This behavior is controlled by the
'qos_requires_clocks' flag in the driver, which ensures that QoS
configuration is bypassed when required clocks are not defined.

Signed-off-by: Odelu Kukatla <odelu.kukatla@....qualcomm.com>
---
 .../interconnect/qcom,sa8775p-rpmh.yaml       | 50 ++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/interconnect/qcom,sa8775p-rpmh.yaml b/Documentation/devicetree/bindings/interconnect/qcom,sa8775p-rpmh.yaml
index db19fd5c5708..71428d2cce18 100644
--- a/Documentation/devicetree/bindings/interconnect/qcom,sa8775p-rpmh.yaml
+++ b/Documentation/devicetree/bindings/interconnect/qcom,sa8775p-rpmh.yaml
@@ -33,18 +33,66 @@ properties:
       - qcom,sa8775p-pcie-anoc
       - qcom,sa8775p-system-noc
 
+  reg:
+    maxItems: 1
+
+  clocks:
+    minItems: 2
+    maxItems: 5
+
 required:
   - compatible
 
 allOf:
   - $ref: qcom,rpmh-common.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,sa8775p-aggre1-noc
+    then:
+      properties:
+        clocks:
+          items:
+            - description: aggre UFS PHY AXI clock
+            - description: aggre QUP PRIM AXI clock
+            - description: aggre USB2 PRIM AXI clock
+            - description: aggre USB3 PRIM AXI clock
+            - description: aggre USB3 SEC AXI clock
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,sa8775p-aggre2-noc
+    then:
+      properties:
+        clocks:
+          items:
+            - description: aggre UFS CARD AXI clock
+            - description: RPMH CC IPA clock
 
 unevaluatedProperties: false
 
 examples:
   - |
-    aggre1_noc: interconnect-aggre1-noc {
+    #include <dt-bindings/clock/qcom,sa8775p-gcc.h>
+    clk_virt: interconnect-clk-virt {
+        compatible = "qcom,sa8775p-clk-virt";
+        #interconnect-cells = <2>;
+        qcom,bcm-voters = <&apps_bcm_voter>;
+    };
+
+    aggre1_noc: interconnect@...0000 {
         compatible = "qcom,sa8775p-aggre1-noc";
+        reg = <0x016c0000 0x18080>;
         #interconnect-cells = <2>;
         qcom,bcm-voters = <&apps_bcm_voter>;
+        clocks = <&gcc GCC_AGGRE_UFS_PHY_AXI_CLK>,
+                 <&gcc GCC_AGGRE_NOC_QUPV3_AXI_CLK>,
+                 <&gcc GCC_AGGRE_USB2_PRIM_AXI_CLK>,
+                 <&gcc GCC_AGGRE_USB3_PRIM_AXI_CLK>,
+                 <&gcc GCC_AGGRE_USB3_SEC_AXI_CLK>;
     };
-- 
2.17.1