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