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

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Date:	Wed, 2 Sep 2009 22:02:33 +0200
From:	Pavel Machek <pavel@....cz>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	Frans Pop <elendil@...net.nl>,
	"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

Hi!

> > > 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>
> > 
> Acked-by: Zhang Rui <rui.zhang@...el.com>
> 
> thanks,
> rui
> > 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
> > +

So '0=disabled'? Better say that, because throttling at 0C would be
useless in most of the world.

Are values below zero supported? Maybe -28000mC should mean
'disabled'? :-).

									Pavel 

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