linux-kernel - Re: [PATCH v2 3/3] Documentation: trace: Add documentation for Coresight Dummy Trace

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Date:   Mon, 27 Mar 2023 16:06:28 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Hao Zhang <quic_hazha@...cinc.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Konrad Dybcio <konradybcio@...il.com>,
        Mike Leach <mike.leach@...aro.org>,
        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:     Leo Yan <leo.yan@...aro.org>,
        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 v2 3/3] Documentation: trace: Add documentation for
 Coresight Dummy Trace

On Fri, Mar 24, 2023 at 02:16:08PM +0800, Hao Zhang wrote:
> +Sysfs files and directories
> +---------------------------
> +
> +Root: ``/sys/bus/coresight/devices/dummy<N>``
> +
> +----
> +
> +:File:            ``enable_source`` (RW)
> +:Notes:
> +    - > 0 : enable the datasets of dummy source.
> +
> +    - = 0 : disable the datasets of dummy source.
> +
> +:Syntax:
> +    ``echo 1 > enable_source``
> +
> +----
> +
> +:File:            ``enable_sink`` (RW)
> +:Notes:
> +    - > 0 : enable the datasets of dummy sink.
> +
> +    - = 0 : disable the datasets of dummy sink.
> +
> +:Syntax:
> +    ``echo 1 > enable_sink``

Is enable_{source,sink} integer-valued or bit (0/1)? In other words, is
it OK to `echo 2` to both sysfs files?

> +
> +----
> +
> +Config details
> +---------------------------
> +
> +There are two types of nodes, dummy sink and dummy source. The nodes
> +should be observed at the coresight path
> +"/sys/bus/coresight/devices".

For consistency, inline this sysfs also (thus
``/sys/bus/coresight/devices``.

> +e.g.
e.g.:: (make the shell snippet below code block)
> +/sys/bus/coresight/devices # ls -l | grep dummy
IMO I prefer `PS1=\$` (that is, omit the directory). Alternatively,
you can write `ls -l /sys/bus/coresight/devices | grep dummy` (specify
the directory to `ls`).

Thanks.

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

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