linux-kernel - [PATCH v1 2/3] dt-bindings: arm: Add Coresight Dummy Trace YAML schema

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Message-Id: <20230316032005.6509-3-quic_hazha@quicinc.com>
Date:   Thu, 16 Mar 2023 11:20:04 +0800
From:   Hao Zhang <quic_hazha@...cinc.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Konrad Dybcio <konradybcio@...il.com>,
        Mike Leach <mike.leach@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Jonathan Corbet <corbet@....net>
Cc:     Hao Zhang <quic_hazha@...cinc.com>, Leo Yan <leo.yan@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Jinlong Mao <quic_jinlmao@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Tao Zhang <quic_taozha@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <andersson@...nel.org>,
        linux-doc@...r.kernel.org
Subject: [PATCH v1 2/3] dt-bindings: arm: Add Coresight Dummy Trace YAML schema

Add new coresight-dummy.yaml file describing the bindings required
to define coresight dummy trace in the device trees.

Signed-off-by: Hao Zhang <quic_hazha@...cinc.com>
---
 .../bindings/arm/qcom,coresight-dummy.yaml    | 129 ++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-dummy.yaml

diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-dummy.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-dummy.yaml
new file mode 100644
index 000000000000..3a7f98df2ee9
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/qcom,coresight-dummy.yaml
@@ -0,0 +1,129 @@
+# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
+# Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/qcom,coresight-dummy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: QCOM Coresight Dummy component
+
+description: |
+  The Coresight Dummy component is for the specific devices that HLOS don't have
+  permission to access or configure. Such as Coresight sink EUD, some TPDMs etc.
+  So there need driver to register dummy devices as Coresight devices. Provide
+  Coresight API for dummy device operations, such as enabling and disabling
+  dummy devices. Build the Coresight path for dummy sink or dummy source for
+  debugging.
+
+  The primary use case of the coresight dummy is to build path for dummy sink or
+  dummy source.
+
+maintainers:
+  - Mao Jinlong <quic_jinlmao@...cinc.com>
+  - Tao Zhang <quic_taozha@...cinc.com>
+  - Hao Zhang <quic_hazha@...cinc.com>
+
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - qcom,coresight-dummy
+  required:
+    - compatible
+
+properties:
+  $nodename:
+    pattern: "^dummy(@[0-9a-f]+)$"
+  compatible:
+    items:
+      - const: qcom,coresight-dummy
+
+  reg:
+    minItems: 1
+    maxItems: 2
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: apb_pclk
+
+  qcom,dummy-sink:
+    type: boolean
+    description:
+      Indicates that the type of this coresight node is dummy sink.
+
+  qcom,dummy-source:
+    type: boolean
+    description:
+      Indicates that the type of this coresight node is dummy source.
+
+  out-ports:
+    description: |
+      Output connections from the dummy source to Coresight Trace bus.
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port:
+        description: Output connection from the dummy source to Coresight
+            Trace bus.
+        $ref: /schemas/graph.yaml#/properties/port
+
+  in-puts:
+    description: |
+      Input connections from the CoreSight Trace bus to dummy sink.
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port:
+        description: Input connection from the Coresight Trace bus to
+            dummy sink.
+        $ref: /schemas/graph.yaml#/properties/port
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - oneOf:
+    - qcom,dummy-sink
+    - qcom,dummy-source
+
+additionalProperties: false
+
+examples:
+  # minimum dummy sink definition. dummy sink connect to coresight replicator.
+  - |
+    dummy_eud: dummy_sink {
+      compatible = "qcom,dummy";
+      qcom,dummy-sink;
+
+      in-ports {
+        port {
+          eud_in_replicator_swao: endpoint {
+            remote-endpoint =
+              <&replicator_swao_out_eud>;
+          };
+        };
+      };
+    };
+
+  # minimum dummy source definition. dummy source connect to coresight funnel.
+  - |
+    dummy_riscv: dummy_source {
+      compatible = "qcom,dummy";
+      qcom,dummy-source;
+
+      out-ports {
+        port {
+          dummy_riscv_out_funnel_swao: endpoint {
+            remote-endpoint =
+              <&funnel_swao_in_dummy_riscv>;
+          };
+        };
+      };
+    };
+
+...
-- 
2.17.1