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    SubjectRe: [PATCH 2/3,v2] acpi: thermal/sysfs-api.txt: document passive attribute for thermal zones
    Signed-off-by: Frans Pop <>
    Cc: Zhang Rui <>
    Cc: Sujith Thomas <>

    While working on some further patches I discovered that polling_delay does
    not actually determine the polling interval for a forced passive trip
    point. Instead a hardcoded interval of 1 second is used (passive_delay).

    I also saw that the thermal_sys driver is somewhat independent of ACPI,
    so the third patch in the series may not be appropriate.

    diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
    index 48e9c5c..f6b3743 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 <>, Zhang Rui <>

    -Updated: 2 January 2008
    +Updated: 21 August 2009

    Copyright (c) 2008 Intel Corporation

    @@ -199,6 +199,15 @@ cdev[0-*]_trip_point
    RO, Optional

    + 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 with an interval
    + of 1 second.
    + Unit: millidegrees Celsius
    + RW, Optional
    * Cooling device attributes *
    @@ -230,8 +239,9 @@ thermal_zone_device (thermal_zone1) with 4 trip points in all.
    It has one processor and one fan, which are both registered as

    -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:


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