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1# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause2# Copyright 2021, Arm Ltd3%YAML 1.24---5$id: http://devicetree.org/schemas/arm/arm,embedded-trace-extension.yaml#6$schema: http://devicetree.org/meta-schemas/core.yaml#7 8title: ARM Embedded Trace Extensions9 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 that16 allows tracing the CPU execution. It overlaps with the CoreSight ETMv417 architecture and has extended support for future architecture changes.18 The trace generated by the ETE could be stored via legacy CoreSight19 components (e.g, TMC-ETR) or other means (e.g, using a per CPU buffer20 Arm Trace Buffer Extension (TRBE)). Since the ETE can be connected to21 legacy CoreSight components, a node must be listed per instance, along22 with any optional connection graph as per the coresight bindings.23 24properties:25 $nodename:26 pattern: "^ete([0-9a-f]+)$"27 compatible:28 items:29 - const: arm,embedded-trace-extension30 31 cpu:32 description: |33 Handle to the cpu this ETE is bound to.34 $ref: /schemas/types.yaml#/definitions/phandle35 36 power-domains:37 maxItems: 138 39 out-ports:40 description: |41 Output connections from the ETE to legacy CoreSight trace bus.42 $ref: /schemas/graph.yaml#/properties/ports43 properties:44 port:45 description: Output connection from the ETE to legacy CoreSight Trace bus.46 $ref: /schemas/graph.yaml#/properties/port47 48required:49 - compatible50 - cpu51 52additionalProperties: false53 54examples:55 56# An ETE node without legacy CoreSight connections57 - |58 ete0 {59 compatible = "arm,embedded-trace-extension";60 cpu = <&cpu_0>;61 };62# An ETE node with legacy CoreSight connections63 - |64 ete1 {65 compatible = "arm,embedded-trace-extension";66 cpu = <&cpu_1>;67 68 out-ports { /* legacy coresight connection */69 port {70 ete1_out_port: endpoint {71 remote-endpoint = <&funnel_in_port0>;72 };73 };74 };75 };76 77...78