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