docs: driver-api/thermal/intel_dptf: Add new workload type hint

Add documentation for longer term classification of workload type for
power or performance.

Signed-off-by: Srinivas Pandruvada <[e-mail]>
Reviewed-by: Randy Dunlap <[e-mail]>
Tested-by: Randy Dunlap <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Rafael J. Wysocki <[e-mail]>

Documentation/driver-api/thermal/intel_dptf.rst

···
 		Limit 1 from being exhausted.
 
 	4 – Unknown: Can't classify.
+
+	On processors starting from Panther Lake additional hints are provided.
+	The hardware analyzes workload residencies over an extended period to
+	determine whether the workload classification tends toward idle/battery
+	life states or sustained/performance states. Based on this long-term
+	analysis, it classifies:
+
+	Power Classification: If the workload exhibits more idle or battery life
+	residencies, it is classified as "power".
+
+	Performance Classification: If the workload exhibits more sustained or
+	performance residencies, it is classified as "performance".
+
+	This approach enables applications to ignore short-term workload
+	fluctuations and instead respond to longer-term power vs. performance
+	trends.
+
+	Residency thresholds for this classification are CPU generation-specific.
+	Classification is reported via bit 4 of the workload_type_index:
+
+	Bit 4 = 1: Power classification
+
+	Bit 4 = 0: Performance classification