hwmon: Add description of the update_rate sysfs attribute

The update_rate attribute can be used by drivers to let userspace choose
the update rate of the chip, if it is configurable.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 10 insertions, 3 deletions

diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
index 3de6b0bcb147..d4e2917c6f18 100644
--- a/Documentation/hwmon/sysfs-interface
+++ b/Documentation/hwmon/sysfs-interface
@@ -80,9 +80,9 @@ All entries (except name) are optional, and should only be created in a
 given driver if the chip has the feature.
 
 
-********
-* Name *
-********
+*********************
+* Global attributes *
+*********************
 
 name            The chip name.
                 This should be a short, lowercase string, not containing
@@ -91,6 +91,13 @@ name		The chip name.
                 I2C devices get this attribute created automatically.
                 RO
 
+update_rate     The rate at which the chip will update readings.
+                Unit: millisecond
+                RW
+                Some devices have a variable update rate. This attribute
+                can be used to change the update rate to the desired
+                frequency.
+
 
 ************
 * Voltages *