74 lines
2.3 KiB
YAML
74 lines
2.3 KiB
YAML
# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/arm/arm,coresight-dummy-sink.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: ARM Coresight Dummy sink component
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description: |
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CoreSight components are compliant with the ARM CoreSight architecture
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specification and can be connected in various topologies to suit a particular
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SoCs tracing needs. These trace components can generally be classified as
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sinks, links and sources. Trace data produced by one or more sources flows
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through the intermediate links connecting the source to the currently selected
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sink.
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The Coresight dummy sink component is for the specific coresight sink devices
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kernel don't have permission to access or configure, e.g., CoreSight EUD on
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Qualcomm platforms. It is a mini-USB hub implemented to support the USB-based
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debug and trace capabilities. For this device, a dummy driver is needed to
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register it as Coresight sink device in kernel side, so that path can be
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created in the driver. Then the trace flow would be transferred to EUD via
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coresight link of AP processor. It provides Coresight API for operations on
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dummy source devices, such as enabling and disabling them. It also provides
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the Coresight dummy source paths for debugging.
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The primary use case of the coresight dummy sink is to build path in kernel
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side for dummy sink component.
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maintainers:
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- Mike Leach <mike.leach@linaro.org>
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- Suzuki K Poulose <suzuki.poulose@arm.com>
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- James Clark <james.clark@arm.com>
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- Mao Jinlong <quic_jinlmao@quicinc.com>
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- Hao Zhang <quic_hazha@quicinc.com>
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properties:
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compatible:
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enum:
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- arm,coresight-dummy-sink
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in-ports:
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$ref: /schemas/graph.yaml#/properties/ports
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properties:
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port:
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description: Input connection from the Coresight Trace bus to
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dummy sink, such as Embedded USB debugger(EUD).
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$ref: /schemas/graph.yaml#/properties/port
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required:
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- compatible
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- in-ports
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additionalProperties: false
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examples:
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# Minimum dummy sink definition. Dummy sink connect to coresight replicator.
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- |
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sink {
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compatible = "arm,coresight-dummy-sink";
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in-ports {
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port {
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eud_in_replicator_swao: endpoint {
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remote-endpoint = <&replicator_swao_out_eud>;
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};
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};
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};
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};
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...
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