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Message-ID: <20230526100753.34581-4-quic_hazha@quicinc.com>
Date: Fri, 26 May 2023 18:07:53 +0800
From: Hao Zhang <quic_hazha@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
Mike Leach <mike.leach@...aro.org>,
Leo Yan <leo.yan@...aro.org>,
James Clark <james.clark@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Konrad Dybcio <konradybcio@...il.com>,
"Rob Herring" <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Andy Gross <agross@...nel.org>,
"Paul Walmsley" <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Jonathan Corbet <corbet@....net>
CC: Hao Zhang <quic_hazha@...cinc.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
<coresight@...ts.linaro.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
Tingwei Zhang <quic_tingweiz@...cinc.com>,
Jinlong Mao <quic_jinlmao@...cinc.com>,
Yuanfang Zhang <quic_yuanfang@...cinc.com>,
Tao Zhang <quic_taozha@...cinc.com>,
Trilok Soni <quic_tsoni@...cinc.com>,
<linux-arm-msm@...r.kernel.org>,
Bjorn Andersson <andersson@...nel.org>,
<linux-doc@...r.kernel.org>
Subject: [PATCH v5 3/3] Documentation: trace: Add documentation for Coresight Dummy Trace
Add documentation for Coresight Dummy Trace under trace/coresight.
Signed-off-by: Hao Zhang <quic_hazha@...cinc.com>
---
.../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..f0a92669288b
--- /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@...cinc.com>
+ :Date: May 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 (e.g, static links), 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@...oc@0:sink/dummy_sink0
+ dummy_source0 -> ../../../devices/platform/soc@...oc@0:source/dummy_source0
--
2.17.1
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