1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/arm/arm,coresight-dummy-source.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: ARM Coresight Dummy source component
8
9 description: |
10 CoreSight components are compliant with the ARM CoreSight architecture
11 specification and can be connected in various topologies to suit a particular
12 SoCs tracing needs. These trace components can generally be classified as
13 sinks, links and sources. Trace data produced by one or more sources flows
14 through the intermediate links connecting the source to the currently selected
15 sink.
16
17 The Coresight dummy source component is for the specific coresight source
18 devices kernel don't have permission to access or configure. For some SOCs,
19 there would be Coresight source trace components on sub-processor which
20 are connected to AP processor via debug bus. For these devices, a dummy driver
21 is needed to register them as Coresight source devices, so that paths can be
22 created in the driver. It provides Coresight API for operations on dummy
23 source devices, such as enabling and disabling them. It also provides the
24 Coresight dummy source paths for debugging.
25
26 The primary use case of the coresight dummy source is to build path in kernel
27 side for dummy source component.
28
29 maintainers:
30 - Mike Leach <mike.leach@linaro.org>
31 - Suzuki K Poulose <suzuki.poulose@arm.com>
32 - James Clark <james.clark@linaro.org>
33 - Mao Jinlong <quic_jinlmao@quicinc.com>
34 - Hao Zhang <quic_hazha@quicinc.com>
35
36 properties:
37 compatible:
38 enum:
39 - arm,coresight-dummy-source
40
41 out-ports:
42 $ref: /schemas/graph.yaml#/properties/ports
43
44 properties:
45 port:
46 description: Output connection from the source to Coresight
47 Trace bus.
48 $ref: /schemas/graph.yaml#/properties/port
49
50 required:
51 - compatible
52 - out-ports
53
54 additionalProperties: false
55
56 examples:
57 # Minimum dummy source definition. Dummy source connect to coresight funnel.
58 - |
59 source {
60 compatible = "arm,coresight-dummy-source";
61
62 out-ports {
63 port {
64 dummy_riscv_out_funnel_swao: endpoint {
65 remote-endpoint = <&funnel_swao_in_dummy_riscv>;
66 };
67 };
68 };
69 };
70
71 ...
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