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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 Description: (Read) Returns the number of special conditional P1 right-hand keys
that the trace unit can use (0x194). The value is taken that the trace unit can use (0x194). The value is taken
directly from the HW. 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) :File: ``addr_idx`` (rw)
:Trace Registers: None. :Trace Registers: None.
:Notes: :Notes: