linux-kernel - Re: [PATCH v3 3/3] Documentation: trace: Add documentation for Coresight Dummy Trace

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Date:   Wed, 10 May 2023 11:29:48 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Hao Zhang <quic_hazha@...cinc.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        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:     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: Re: [PATCH v3 3/3] Documentation: trace: Add documentation for
 Coresight Dummy Trace

On Sat, Apr 22, 2023 at 03:37:14PM +0800, Hao Zhang wrote:
> +Introduction
> +---------------------------
> +
> +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. So there need driver to register dummy devices
> +as Coresight devices. It may also be used to define components that
> +may not have any programming interfaces (e.g, static links), so that
> +paths can be established in the driver. Provide Coresight API for
> +dummy device operations, such as enabling and disabling dummy devices.
> +Build the Coresight path for dummy sink or dummy source for debugging.
> +
> +Config details
> +---------------------------
> +
> +There are two types of nodes, dummy sink and dummy source. The nodes
> +should be observed at the below coresight path::
> +
> +    ``/sys/bus/coresight/devices``.
> +
> +e.g.::
> +
> +    / $ ls -l /sys/bus/coresight/devices | grep dummy
> +    dummy0 -> ../../../devices/platform/soc@...oc@0:dummy_source/dummy0
> +    dummy1 -> ../../../devices/platform/soc@...oc@0:dummy_sink/dummy1

The wording confuses me, so I have to make the improv:

---- >8 ----
diff --git a/Documentation/trace/coresight/coresight-dummy.rst b/Documentation/trace/coresight/coresight-dummy.rst
index 7cb59f080c8892..f0a92669288b0c 100644
--- a/Documentation/trace/coresight/coresight-dummy.rst
+++ b/Documentation/trace/coresight/coresight-dummy.rst
@@ -8,27 +8,25 @@ Coresight Dummy Trace Module
     :Date:     May 2023
 
 Introduction
----------------------------
+------------
 
-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. So there need driver to register dummy devices
-as Coresight devices. It may also be used to define components that
-may not have any programming interfaces (e.g, static links), so that
-paths can be established in the driver. Provide Coresight API for
-dummy device operations, such as enabling and disabling dummy devices.
-Build the Coresight path for dummy sink or dummy source for debugging.
+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. The nodes
-should be observed at the below coresight path::
+There are two types of nodes, dummy sink and dummy source. These nodes
+are available at ``/sys/bus/coresight/devices``.
 
-    ``/sys/bus/coresight/devices``.
+Example output::
 
-e.g.::
-
-    / $ ls -l /sys/bus/coresight/devices | grep dummy
+    $ 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

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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