1# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/arm/arm,coresight-dummy-sink.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: ARM Coresight Dummy sink component
8
9description: |
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 sink component is for the specific coresight sink devices
18  kernel don't have permission to access or configure, e.g., CoreSight EUD on
19  Qualcomm platforms. It is a mini-USB hub implemented to support the USB-based
20  debug and trace capabilities. For this device, a dummy driver is needed to
21  register it as Coresight sink device in kernel side, so that path can be
22  created in the driver. Then the trace flow would be transferred to EUD via
23  coresight link of AP processor. It provides Coresight API for operations on
24  dummy source devices, such as enabling and disabling them. It also provides
25  the Coresight dummy source paths for debugging.
26
27  The primary use case of the coresight dummy sink is to build path in kernel
28  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@arm.com>
34  - Mao Jinlong <quic_jinlmao@quicinc.com>
35  - Hao Zhang <quic_hazha@quicinc.com>
36
37properties:
38  compatible:
39    enum:
40      - arm,coresight-dummy-sink
41
42  in-ports:
43    $ref: /schemas/graph.yaml#/properties/ports
44
45    properties:
46      port:
47        description: Input connection from the Coresight Trace bus to
48          dummy sink, such as Embedded USB debugger(EUD).
49
50        $ref: /schemas/graph.yaml#/properties/port
51
52required:
53  - compatible
54  - in-ports
55
56additionalProperties: false
57
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