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From:   Mao Jinlong <quic_jinlmao@quicinc.com>
To:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>
CC:     Mao Jinlong <quic_jinlmao@quicinc.com>,
        <linux-arm-msm@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        Tingwei Zhang <quic_tingweiz@quicinc.com>,
        Yuanfang Zhang <quic_yuanfang@quicinc.com>,
        "Tao Zhang" <quic_taozha@quicinc.com>
Subject: [PATCH v2 1/4] dt-bindings: arm: Add remote etm dt-binding
Date:   Tue, 5 Dec 2023 00:29:16 -0800
Message-ID: <20231205082922.32149-2-quic_jinlmao@quicinc.com>
In-Reply-To: <20231205082922.32149-1-quic_jinlmao@quicinc.com>
References: <20231205082922.32149-1-quic_jinlmao@quicinc.com>
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Remote ETM(Embedded Trace Macrocell) is to capture information of
the executed processor instructions of remote processors like modem.
Add new coresight-remote-etm.yaml file describing the bindings
required to define coresight remote etm in the device trees.

Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
---
 .../arm/qcom,coresight-remote-etm.yaml        | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-remote-etm.yaml

diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-remote-etm.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-remote-etm.yaml
new file mode 100644
index 000000000000..bc76cda33620
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/qcom,coresight-remote-etm.yaml
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/qcom,coresight-remote-etm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Coresight Remote ETM(Embedded Trace Macrocell)
+
+maintainers:
+  - Jinlong Mao <quic_jinlmao@quicinc.com>
+  - Tao Zhang <quic_taozha@quicinc.com>
+
+description:
+  Support for ETM trace collection on remote processor using coresight
+  framework. Enabling this will allow turning on ETM tracing on remote
+  processor like modem processor via sysfs and collecting the trace
+  via coresight TMC sinks.
+
+properties:
+  compatible:
+    const: qcom,coresight-remote-etm
+
+  qcom,inst-id:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Each kind of remote ETM has its unique instance id. The remote etm will
+      be enabled/disabled on remote processor based on the id send from
+      ap processor.
+
+  out-ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    additionalProperties: false
+
+    properties:
+      port:
+        description: Output connection to the CoreSight Trace bus.
+        $ref: /schemas/graph.yaml#/properties/port
+
+required:
+  - compatible
+  - qcom,inst-id
+  - out-ports
+
+additionalProperties: false
+
+examples:
+  - |
+    modem-etm0 {
+          compatible = "qcom,coresight-remote-etm";
+          qcom,inst-id = <2>;
+
+          out-ports {
+              port {
+                  modem_etm0_out_funnel_modem: endpoint {
+                  remote-endpoint = <&funnel_modem_in_modem_etm0>;
+                  };
+              };
+          };
+    };
+...
-- 
2.41.0