On Fri, May 05, 2023 at 11:54:03AM +0100, Suzuki Kuruppassery Poulose wrote:

[...]

quoted

+title: ARM Coresight Dummy component
+
+description: |
+  Coresight Dummy Trace Module is for the specific devices that kernel
+  don't have permission to access or configure, e.g., CoreSight TPDMs
+  on Qualcomm platforms. So there need driver to register dummy devices
+  as Coresight devices. It may also be used to define components that
+  may not have any programming interfaces (e.g, static links), so that
+  paths can be established in the driver. 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 in kernel
+  side for dummy sink and dummy source.
+
+maintainers:
+  - Mao Jinlong [off-list ref]
+  - Tao Zhang [off-list ref]
+  - Hao Zhang [off-list ref]
+  - Yuanfang Zhang [off-list ref]

Given this is a generic "CoreSight" component, I would prefer to have the
CoreSight subsystem maintainers listed here (too). I don't mind
the entries above, but would like to make sure that the subsystem
people are aware of the changes happening here. Please use:

Mike Leach [off-list ref]
Suzuki K Poulose [off-list ref]
Leo Yan [off-list ref]

Given I am spending little time on CoreSight reviewing, I'd like to
use James Clark's email address to replace my own; I believe this
would benefit long term maintenance.

  James Clark [off-list ref]

Thanks!

With the above:

Acked-by: Suzuki K Poulose <suzuki.poulose@arm.com>

quoted

+
+properties:
+  compatible:
+    items:
+      - enum:
+          - arm,coresight-dummy-sink
+          - arm,coresight-dummy-source
+
+  out-ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port:
+        description: Output connection from the source to Coresight
+          Trace bus.
+        $ref: /schemas/graph.yaml#/properties/port
+
+  in-ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port:
+        description: Input connection from the Coresight Trace bus to
+          dummy sink, such as Embedded USB debugger(EUD).
+        $ref: /schemas/graph.yaml#/properties/port
+
+required:
+  - compatible
+
+if:
+  # If the compatible contains the below value
+  properties:
+    compatible:
+      contains:
+        const: arm,coresight-dummy-sink
+
+then:
+  required:
+    - in-ports
+
+else:
+  required:
+    - out-ports
+
+additionalProperties: false
+
+examples:
+  # Minimum dummy sink definition. Dummy sink connect to coresight replicator.
+  - |
+    sink {
+      compatible = "arm,coresight-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.
+  - |
+    source {
+      compatible = "arm,coresight-dummy-source";
+
+      out-ports {
+        port {
+          dummy_riscv_out_funnel_swao: endpoint {
+            remote-endpoint = <&funnel_swao_in_dummy_riscv>;
+          };
+        };
+      };
+    };
+
+...

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