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

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Date:	Tue, 01 Sep 2009 08:44:42 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Frans Pop <elendil@...net.nl>
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 Mon, 2009-08-31 at 19:19 +0800, Frans Pop wrote:
> 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>
> 
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
> +
>  *****************************
>  * Cooling device attributes *
>  *****************************

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