thermal: sysfs-api.txt - document passive attribute for thermal zones

[safe/jmp/linux-2.6] / Documentation / thermal / sysfs-api.txt

diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index 895337f..a87dc27 100644 (file)
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -199,6 +199,15 @@ cdev[0-*]_trip_point
        point.
        RO, Optional
 
+passive
+       Attribute is only present for zones in which the passive cooling
+       policy is not supported by native thermal driver. Default is zero
+       and can be set to a temperature (in millidegrees) to enable a
+       passive trip point for the zone. Activation is done by polling with
+       an interval of 1 second.
+       Unit: millidegrees Celsius
+       RW, Optional
+
 *****************************
 * Cooling device attributes *
 *****************************