hwmon: Define sysfs interface for energy consumption register

Describe the sysfs files that were introduced in the ibmaem driver.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
index 2d84573..6dbfd5e 100644
--- a/Documentation/hwmon/sysfs-interface
+++ b/Documentation/hwmon/sysfs-interface
@@ -329,6 +329,10 @@
 				Unit: microWatt
 				RO
 
+power[1-*]_average_interval	Power use averaging interval
+				Unit: milliseconds
+				RW
+
 power[1-*]_average_highest	Historical average maximum power use
 				Unit: microWatt
 				RO
@@ -354,6 +358,14 @@
 				WO
 
 **********
+* Energy *
+**********
+
+energy[1-*]_input		Cumulative energy use
+				Unit: microJoule
+				RO
+
+**********
 * Alarms *
 **********