"Gautham R. Shenoy" [off-list ref] writes:

+
+What: 		/sys/devices/system/cpu/cpuX/idle_purr
+Date:		Nov 2019
+Contact:	Linux for PowerPC mailing list [off-list ref]
+Description:	PURR ticks for cpuX when it was idle.
+
+		This sysfs interface exposes the number of PURR ticks
+		for cpuX when it was idle.
+
+What: 		/sys/devices/system/cpu/cpuX/spurr

                        /sys/devices/system/cpu/cpuX/idle_spurr

+Date:		Nov 2019
+Contact:	Linux for PowerPC mailing list [off-list ref]
+Description:	SPURR ticks for cpuX when it was idle.
+
+		This sysfs interface exposes the number of SPURR ticks
+		for cpuX when it was idle.