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-rw-r--r--Documentation/cpu-freq/intel-pstate.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/cpu-freq/intel-pstate.txt b/Documentation/cpu-freq/intel-pstate.txt
index 7767ce6756be..655750743fb0 100644
--- a/Documentation/cpu-freq/intel-pstate.txt
+++ b/Documentation/cpu-freq/intel-pstate.txt
@@ -41,6 +41,10 @@ controlling P state selection. These files have been added to
is supported by hardware that is in the turbo range. This number
is independent of whether turbo has been disabled or not.
+ num_pstates: displays the number of pstates that are supported
+ by hardware. This number is independent of whether turbo has
+ been disabled or not.
+
For contemporary Intel processors, the frequency is controlled by the
processor itself and the P-states exposed to software are related to
performance levels. The idea that frequency can be set to a single