add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/Documentation/ABI/testing/sysfs-bus-intel_th-output-devices
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@@ -3,11 +3,13 @@
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 KernelVersion:	4.3
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 Contact:	Alexander Shishkin <alexander.shishkin@linux.intel.com>
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 Description:	(RW) Writes of 1 or 0 enable or disable trace output to this
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-		output device. Reads return current status.
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+		output device. Reads return current status. Requires that the
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+		correstponding output port driver be loaded.
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 What:		/sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/port
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 Date:		June 2015
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 KernelVersion:	4.3
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 Contact:	Alexander Shishkin <alexander.shishkin@linux.intel.com>
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 Description:	(RO) Port number, corresponding to this output device on the
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-		switch (GTH).
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+		switch (GTH) or "unassigned" if the corresponding output
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+		port driver is not loaded.