thermal: sysfs-api.txt - document passive attribute for thermal zones
Frans Pop [Mon, 26 Oct 2009 07:39:00 +0000 (08:39 +0100)]
Signed-off-by: Frans Pop <elendil@planet.nl>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

Documentation/thermal/sysfs-api.txt

index 895337f..a87dc27 100644 (file)
@@ -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 *
 *****************************