[PATCH 2/3] acpi: thermal/sysfs-api.txt: document passive attribute for thermal zones

[Frans Pop]

Signed-off-by: Frans Pop <elendil@xxxxxxxxx>
Cc: Zhang Rui <rui.zhang@xxxxxxxxx>
Cc: Sujith Thomas <sujith.thomas@xxxxxxxxx>

diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index 48e9c5c..52b63c4 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -3,7 +3,7 @@ Generic Thermal Sysfs driver How To
 
 Written by Sujith Thomas <sujith.thomas@xxxxxxxxx>, Zhang Rui <rui.zhang@xxxxxxxxx>
 
-Updated: 2 January 2008
+Updated: 21 August 2009
 
 Copyright (c)  2008 Intel Corporation
 
@@ -199,6 +199,16 @@ cdev[0-*]_trip_point
 	point.
 	RO, Optional
 
+passive
+	Attribute is only present for zones which do not have a passive
+	cooling policy (_PSV) defined in ACPI. 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 (default interval:
+	10 seconds); the polling interval can be set in
+	/proc/acpi/thermal/TZN/polling_frequency.
+	Unit: millidegree Celsius
+	RW, Optional
+
 *****************************
 * Cooling device attributes *
 *****************************
@@ -230,8 +240,9 @@ thermal_zone_device (thermal_zone1) with 4 trip points in all.
 It has one processor and one fan, which are both registered as
 thermal_cooling_device.
 
-If the processor is listed in _PSL method, and the fan is listed in _AL0
-method, the sys I/F structure will be built like this:
+If the processor is listed in _PSL method, the fan is listed in _AL0
+method, and the zone has a _PSV method, the sys I/F structure will be
+built like this:
 
 /sys/class/thermal:
 
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