linux-kernel - Re: [PATCH 2/6] thermal: sysfs-api.txt - document passive attribute for thermal zones

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Date:	Mon, 31 Aug 2009 13:19:58 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Thomas, Sujith" <sujith.thomas@...el.com>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [PATCH 2/6] thermal: sysfs-api.txt - document passive attribute for thermal zones

On Monday 31 August 2009, Zhang Rui wrote:
> > +passive
> > +	Attribute is only present for zones which do not have a passive
> > +	cooling policy (_PSV) defined in ACPI.
>
> We should not involve any platform specific stuff in this
> documentation. how about "Attribute is only present for zones in which
> the passive cooling policy is not supported by native thermal driver"
[...]
> > -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:
>
> For an ACPI thermal zone, supporting passive cooling means that both
> _PSL and _PSV are available.
> so I don't think we need to change this. :)

OK. Updated patch below.


From: Frans Pop <elendil@...net.nl>
Subject: thermal: sysfs-api.txt - document passive attribute for thermal zones

Signed-off-by: Frans Pop <elendil@...net.nl>
Cc: Zhang Rui <rui.zhang@...el.com>
Cc: Sujith Thomas <sujith.thomas@...el.com>
Cc: Matthew Garrett <mjg59@...f.ucam.org>

diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index 895337f..a87dc27 100644
--- 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 *
 *****************************
--
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