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SubjectRe: [PATCH v2 2/2] coresight: etm4x: docs: Add documentation for 'ts_source' sysfs interface
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Hi,

Thanks for your comments and review in the previous submission (and
sorry for not including a cover letter this time).

Do you want me to hold on this change, or update the corresponding
fields with new estimates?

Thanks,
German

On 03/05/2022 13:35, German Gomez wrote:
> Sync sysfs documentation pages to include the new ts_source (timestamp
> source) interface.
>
> Signed-off-by: German Gomez <german.gomez@arm.com>
> ---
> v1:
> - https://lore.kernel.org/all/20220429123100.268059-3-german.gomez@arm.com/
> v2:
> - Update Data, KernelVersion, and Contact fields (Date is
> tentative but likely).
> ---
> .../ABI/testing/sysfs-bus-coresight-devices-etm4x | 8 ++++++++
> .../trace/coresight/coresight-etm4x-reference.rst | 14 ++++++++++++++
> 2 files changed, 22 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
> index 8e53a32f81505..520dd2e27eab3 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
> @@ -516,3 +516,11 @@ Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
> Description: (Read) Returns the number of special conditional P1 right-hand keys
> that the trace unit can use (0x194). The value is taken
> directly from the HW.
> +
> +What: /sys/bus/coresight/devices/etm<N>/ts_source
> +Date: July 2022
> +KernelVersion: 5.19
> +Contact: Mathieu Poirier <mathieu.poirier@linaro.org> or Suzuki K Poulose <suzuki.poulose@arm.com>
> +Description: (Read) When FEAT_TRF is implemented, value of TRFCR_ELx.TS used for
> + trace session. Otherwise -1 indicates an unknown time source. Check
> + trcidr0.tssize to see if a global timestamp is available.
> diff --git a/Documentation/trace/coresight/coresight-etm4x-reference.rst b/Documentation/trace/coresight/coresight-etm4x-reference.rst
> index d25dfe86af9bf..f016c7c29429b 100644
> --- a/Documentation/trace/coresight/coresight-etm4x-reference.rst
> +++ b/Documentation/trace/coresight/coresight-etm4x-reference.rst
> @@ -71,6 +71,20 @@ the ‘TRC’ prefix.
>
> ----
>
> +:File: ``ts_source`` (ro)
> +:Trace Registers: None.
> +:Notes:
> + When FEAT_TRF is implemented, value of TRFCR_ELx.TS used for trace session. Otherwise -1
> + indicates an unknown time source. Check trcidr0.tssize to see if a global timestamp is
> + available.
> +
> +:Example:
> + ``$> cat ts_source``
> +
> + ``$> 1``
> +
> +----
> +
> :File: ``addr_idx`` (rw)
> :Trace Registers: None.
> :Notes:

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