1# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
2# Copyright 2021, Arm Ltd
3%YAML 1.2
4---
5$id: "http://devicetree.org/schemas/arm/ete.yaml#"
6$schema: "http://devicetree.org/meta-schemas/core.yaml#"
7
8title: ARM Embedded Trace Extensions
9
10maintainers:
11  - Suzuki K Poulose <suzuki.poulose@arm.com>
12  - Mathieu Poirier <mathieu.poirier@linaro.org>
13
14description: |
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  See bindings/arm/coresight.txt.
24
25properties:
26  $nodename:
27    pattern: "^ete([0-9a-f]+)$"
28  compatible:
29    items:
30      - const: arm,embedded-trace-extension
31
32  cpu:
33    description: |
34      Handle to the cpu this ETE is bound to.
35    $ref: /schemas/types.yaml#/definitions/phandle
36
37  out-ports:
38    description: |
39      Output connections from the ETE to legacy CoreSight trace bus.
40    $ref: /schemas/graph.yaml#/properties/ports
41    properties:
42      port:
43        description: Output connection from the ETE to legacy CoreSight Trace bus.
44        $ref: /schemas/graph.yaml#/properties/port
45
46required:
47  - compatible
48  - cpu
49
50additionalProperties: false
51
52examples:
53
54# An ETE node without legacy CoreSight connections
55  - |
56    ete0 {
57      compatible = "arm,embedded-trace-extension";
58      cpu = <&cpu_0>;
59    };
60# An ETE node with legacy CoreSight connections
61  - |
62   ete1 {
63      compatible = "arm,embedded-trace-extension";
64      cpu = <&cpu_1>;
65
66      out-ports {        /* legacy coresight connection */
67         port {
68             ete1_out_port: endpoint {
69                remote-endpoint = <&funnel_in_port0>;
70             };
71         };
72      };
73   };
74
75...
76