linux-kernel - [PATCH v2 1/3] dt-bindings: arm: qcom: Add Coresight Interconnect TNOC

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Message-Id: <20250819-itnoc-v2-1-2d0e6be44e2f@oss.qualcomm.com>
Date: Tue, 19 Aug 2025 03:27:43 -0700
From: Yuanfang Zhang <yuanfang.zhang@....qualcomm.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: kernel@....qualcomm.com, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yuanfang Zhang <yuanfang.zhang@....qualcomm.com>
Subject: [PATCH v2 1/3] dt-bindings: arm: qcom: Add Coresight Interconnect
 TNOC

Add device tree binding for Qualcomm Coresight Interconnect Trace
Network On Chip (ITNOC). This TNOC acts as a CoreSight
graph link that forwards trace data from a subsystem to the
Aggregator TNOC, without aggregation or ATID functionality.

Signed-off-by: Yuanfang Zhang <yuanfang.zhang@....qualcomm.com>
---
 .../bindings/arm/qcom,coresight-itnoc.yaml         | 96 ++++++++++++++++++++++
 1 file changed, 96 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-itnoc.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-itnoc.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..a3b5f2b949f69617a014d0ae2831c9c767178f8c
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/qcom,coresight-itnoc.yaml
@@ -0,0 +1,96 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/qcom,coresight-itnoc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Interconnect Trace Network On Chip - ITNOC
+
+maintainers:
+  - Yuanfang Zhang <yuanfang.zhang@....qualcomm.com>
+
+description:
+  The Interconnect TNOC is a CoreSight graph link that forwards trace data
+  from a subsystem to the Aggregator TNOC. Compared to Aggregator TNOC, it
+  does not have aggregation and ATID functionality.
+
+properties:
+  $nodename:
+    pattern: "^itnoc(@[0-9a-f]+)?$"
+
+  compatible:
+    const: qcom,coresight-itnoc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: apb
+
+  in-ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      '#address-cells':
+        const: 1
+      '#size-cells':
+        const: 0
+
+    patternProperties:
+      '^port(@[0-9a-f]{1,2})?$':
+        description: Input connections from CoreSight Trace Bus
+        $ref: /schemas/graph.yaml#/properties/port
+
+  out-ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    additionalProperties: false
+
+    properties:
+      port:
+        description: out connections to aggregator TNOC
+        $ref: /schemas/graph.yaml#/properties/port
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - in-ports
+  - out-ports
+
+additionalProperties: false
+
+examples:
+  - |
+    itnoc@...ac000 {
+        compatible = "qcom,coresight-itnoc";
+        reg = <0x109ac000 0x1000>;
+
+        clocks = <&aoss_qmp>;
+        clock-names = "apb";
+
+        in-ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            port@0 {
+                reg = <0>;
+                tn_ic_in_tpdm_dcc: endpoint {
+                    remote-endpoint = <&tpdm_dcc_out_tn_ic>;
+                };
+            };
+        };
+
+        out-ports {
+            port {
+                tn_ic_out_tnoc_aggr: endpoint {
+                    /* to Aggregator TNOC input */
+                    remote-endpoint = <&tn_ag_in_tn_ic>;
+                };
+            };
+        };
+    };
+...

-- 
2.34.1