[PATCH v6 3/3] Documentation: trace: Add documentation for Coresight Dummy Trace
From: Hao Zhang <hidden>
Date: 2023-06-02 08:43:15
Also in:
linux-arm-msm, linux-devicetree, linux-doc, lkml
Subsystem:
arm/coresight framework and drivers, documentation, the rest, tracing · Maintainers:
Suzuki K Poulose, Jonathan Corbet, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
Add documentation for Coresight Dummy Trace under trace/coresight. Reviewed-by: Bagas Sanjaya <redacted> Signed-off-by: Hao Zhang <redacted> --- .../trace/coresight/coresight-dummy.rst | 32 +++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 Documentation/trace/coresight/coresight-dummy.rst
diff --git a/Documentation/trace/coresight/coresight-dummy.rst b/Documentation/trace/coresight/coresight-dummy.rst
new file mode 100644
index 000000000000..eff7c553ee6c
--- /dev/null
+++ b/Documentation/trace/coresight/coresight-dummy.rst@@ -0,0 +1,32 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================= +Coresight Dummy Trace Module +============================= + + :Author: Hao Zhang <quic_hazha@quicinc.com> + :Date: June 2023 + +Introduction +------------ + +The Coresight dummy trace module is for the specific devices that kernel don't +have permission to access or configure, e.g., CoreSight TPDMs on Qualcomm +platforms. For these devices, a dummy driver is needed to register them as +Coresight devices. The module may also be used to define components that may +not have any programming interfaces, so that paths can be created in the driver. +It provides Coresight API for operations on dummy devices, such as enabling and +disabling them. It also provides the Coresight dummy sink/source paths for +debugging. + +Config details +-------------- + +There are two types of nodes, dummy sink and dummy source. These nodes +are available at ``/sys/bus/coresight/devices``. + +Example output:: + + $ ls -l /sys/bus/coresight/devices | grep dummy + dummy_sink0 -> ../../../devices/platform/soc@0/soc@0:sink/dummy_sink0 + dummy_source0 -> ../../../devices/platform/soc@0/soc@0:source/dummy_source0
--
2.17.1
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