Staging
v0.7.0
v0.7.0
https://github.com/torvalds/linux
Tip revision: 2dde18cd1d8fac735875f2e4987f11817cc0bc2c authored by Linus Torvalds on 27 August 2023, 21:49:51 UTC
Linux 6.5
Linux 6.5
Tip revision: 2dde18c
arm,coresight-dummy-sink.yaml
# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/arm/arm,coresight-dummy-sink.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: ARM Coresight Dummy sink 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 sink component is for the specific coresight sink devices
kernel don't have permission to access or configure, e.g., CoreSight EUD on
Qualcomm platforms. It is a mini-USB hub implemented to support the USB-based
debug and trace capabilities. For this device, a dummy driver is needed to
register it as Coresight sink device in kernel side, so that path can be
created in the driver. Then the trace flow would be transferred to EUD via
coresight link of AP processor. 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 sink is to build path in kernel
side for dummy sink 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-sink
in-ports:
$ref: /schemas/graph.yaml#/properties/ports
properties:
port:
description: Input connection from the Coresight Trace bus to
dummy sink, such as Embedded USB debugger(EUD).
$ref: /schemas/graph.yaml#/properties/port
required:
- compatible
- in-ports
additionalProperties: false
examples:
# Minimum dummy sink definition. Dummy sink connect to coresight replicator.
- |
sink {
compatible = "arm,coresight-dummy-sink";
in-ports {
port {
eud_in_replicator_swao: endpoint {
remote-endpoint = <&replicator_swao_out_eud>;
};
};
};
};
...