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coresight: etm4x: docs: Add documentation for 'ts_source' sysfs interface 

Sync sysfs documentation pages to include the new ts_source (timestamp
source) interface.

Signed-off-by: German Gomez <german.gomez@arm.com>
Signed-off-by: James Clark <james.clark@arm.com>
Link: https://lore.kernel.org/r/20220823160650.455823-3-james.clark@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
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German Gomez 2022-08-23 17:06:50 +01:00 committed by Mathieu Poirier
parent 0f00b223ea
commit 04d1edb0ec
2 changed files with 22 additions and 0 deletions
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8
Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
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@ -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: October 2022
KernelVersion: 6.1
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.

14
Documentation/trace/coresight/coresight-etm4x-reference.rst
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@ -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: