arm,embedded-trace-extension.yaml

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    1 # SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
    2 # Copyright 2021, Arm Ltd
    3 %YAML 1.2
    4 ---
    5 $id: "http://devicetree.org/schemas/arm/arm,embedded-trace-extension.yaml#"
    6 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
    7 
    8 title: ARM Embedded Trace Extensions
    9 
   10 maintainers:
   11   - Suzuki K Poulose <suzuki.poulose@arm.com>
   12   - Mathieu Poirier <mathieu.poirier@linaro.org>
   13 
   14 description: |
   15   Arm Embedded Trace Extension(ETE) is a per CPU trace component that
   16   allows tracing the CPU execution. It overlaps with the CoreSight ETMv4
   17   architecture and has extended support for future architecture changes.
   18   The trace generated by the ETE could be stored via legacy CoreSight
   19   components (e.g, TMC-ETR) or other means (e.g, using a per CPU buffer
   20   Arm Trace Buffer Extension (TRBE)). Since the ETE can be connected to
   21   legacy CoreSight components, a node must be listed per instance, along
   22   with any optional connection graph as per the coresight bindings.
   23 
   24 properties:
   25   $nodename:
   26     pattern: "^ete([0-9a-f]+)$"
   27   compatible:
   28     items:
   29       - const: arm,embedded-trace-extension
   30 
   31   cpu:
   32     description: |
   33       Handle to the cpu this ETE is bound to.
   34     $ref: /schemas/types.yaml#/definitions/phandle
   35 
   36   out-ports:
   37     description: |
   38       Output connections from the ETE to legacy CoreSight trace bus.
   39     $ref: /schemas/graph.yaml#/properties/ports
   40     properties:
   41       port:
   42         description: Output connection from the ETE to legacy CoreSight Trace bus.
   43         $ref: /schemas/graph.yaml#/properties/port
   44 
   45 required:
   46   - compatible
   47   - cpu
   48 
   49 additionalProperties: false
   50 
   51 examples:
   52 
   53 # An ETE node without legacy CoreSight connections
   54   - |
   55     ete0 {
   56       compatible = "arm,embedded-trace-extension";
   57       cpu = <&cpu_0>;
   58     };
   59 # An ETE node with legacy CoreSight connections
   60   - |
   61    ete1 {
   62       compatible = "arm,embedded-trace-extension";
   63       cpu = <&cpu_1>;
   64 
   65       out-ports {        /* legacy coresight connection */
   66          port {
   67              ete1_out_port: endpoint {
   68                 remote-endpoint = <&funnel_in_port0>;
   69              };
   70          };
   71       };
   72    };
   73 
   74 ...

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sys/contrib/device-tree/Bindings/arm/arm,embedded-trace-extension.yaml