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1# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause2%YAML 1.23---4$id: http://devicetree.org/schemas/arm/arm,coresight-dummy-sink.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: ARM Coresight Dummy sink component8 9description: |10 CoreSight components are compliant with the ARM CoreSight architecture11 specification and can be connected in various topologies to suit a particular12 SoCs tracing needs. These trace components can generally be classified as13 sinks, links and sources. Trace data produced by one or more sources flows14 through the intermediate links connecting the source to the currently selected15 sink.16 17 The Coresight dummy sink component is for the specific coresight sink devices18 kernel don't have permission to access or configure, e.g., CoreSight EUD on19 Qualcomm platforms. It is a mini-USB hub implemented to support the USB-based20 debug and trace capabilities. For this device, a dummy driver is needed to21 register it as Coresight sink device in kernel side, so that path can be22 created in the driver. Then the trace flow would be transferred to EUD via23 coresight link of AP processor. It provides Coresight API for operations on24 dummy source devices, such as enabling and disabling them. It also provides25 the Coresight dummy source paths for debugging.26 27 The primary use case of the coresight dummy sink is to build path in kernel28 side for dummy sink component.29 30maintainers:31 - Mike Leach <mike.leach@linaro.org>32 - Suzuki K Poulose <suzuki.poulose@arm.com>33 - James Clark <james.clark@linaro.org>34 - Mao Jinlong <quic_jinlmao@quicinc.com>35 - Hao Zhang <quic_hazha@quicinc.com>36 37properties:38 compatible:39 enum:40 - arm,coresight-dummy-sink41 42 in-ports:43 $ref: /schemas/graph.yaml#/properties/ports44 45 properties:46 port:47 description: Input connection from the Coresight Trace bus to48 dummy sink, such as Embedded USB debugger(EUD).49 50 $ref: /schemas/graph.yaml#/properties/port51 52required:53 - compatible54 - in-ports55 56additionalProperties: false57 58examples:59 # Minimum dummy sink definition. Dummy sink connect to coresight replicator.60 - |61 sink {62 compatible = "arm,coresight-dummy-sink";63 64 in-ports {65 port {66 eud_in_replicator_swao: endpoint {67 remote-endpoint = <&replicator_swao_out_eud>;68 };69 };70 };71 };72 73...74