# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
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# Copyright 2021, Arm Ltd
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%YAML 1.2
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---
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$id: "http://devicetree.org/schemas/arm/ete.yaml#"
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$schema: "http://devicetree.org/meta-schemas/core.yaml#"
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title: ARM Embedded Trace Extensions
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maintainers:
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- Suzuki K Poulose <suzuki.poulose@arm.com>
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- Mathieu Poirier <mathieu.poirier@linaro.org>
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description: |
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Arm Embedded Trace Extension(ETE) is a per CPU trace component that
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allows tracing the CPU execution. It overlaps with the CoreSight ETMv4
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architecture and has extended support for future architecture changes.
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The trace generated by the ETE could be stored via legacy CoreSight
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components (e.g, TMC-ETR) or other means (e.g, using a per CPU buffer
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Arm Trace Buffer Extension (TRBE)). Since the ETE can be connected to
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legacy CoreSight components, a node must be listed per instance, along
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with any optional connection graph as per the coresight bindings.
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See bindings/arm/coresight.txt.
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properties:
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$nodename:
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pattern: "^ete([0-9a-f]+)$"
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compatible:
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items:
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- const: arm,embedded-trace-extension
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cpu:
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description: |
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Handle to the cpu this ETE is bound to.
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$ref: /schemas/types.yaml#/definitions/phandle
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out-ports:
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description: |
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Output connections from the ETE to legacy CoreSight trace bus.
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$ref: /schemas/graph.yaml#/properties/ports
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properties:
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port:
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description: Output connection from the ETE to legacy CoreSight Trace bus.
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$ref: /schemas/graph.yaml#/properties/port required:
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required:
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- compatible
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- cpu
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additionalProperties: false
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examples:
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# An ETE node without legacy CoreSight connections
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- |
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ete0 {
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compatible = "arm,embedded-trace-extension";
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cpu = <&cpu_0>;
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};
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# An ETE node with legacy CoreSight connections
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- |
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ete1 {
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compatible = "arm,embedded-trace-extension";
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cpu = <&cpu_1>;
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out-ports { /* legacy coresight connection */
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port {
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ete1_out_port: endpoint {
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remote-endpoint = <&funnel_in_port0>;
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};
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};
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};
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};
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...
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