linux-kernel - RE: [PATCH 0/8] Thermal Framework Enhancements

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Date:	Fri, 21 Dec 2012 09:17:27 +0000
From:	"R, Durgadoss" <durgadoss.r@...el.com>
To:	Hongbo Zhang <hongbo.zhang@...aro.org>
CC:	Wei Ni <wni@...dia.com>, "Zhang, Rui" <rui.zhang@...el.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/8] Thermal Framework Enhancements


> -----Original Message-----
> From: Hongbo Zhang [mailto:hongbo.zhang@...aro.org]
> Sent: Friday, December 21, 2012 2:17 PM
> To: R, Durgadoss
> Cc: Wei Ni; Zhang, Rui; linux-pm@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH 0/8] Thermal Framework Enhancements
> 
> On 21 December 2012 16:30, R, Durgadoss <durgadoss.r@...el.com> wrote:
> > Hi Ni,
> >
> >> -----Original Message-----
> >> From: Wei Ni [mailto:wni@...dia.com]
> >> Sent: Friday, December 21, 2012 1:36 PM
> >> To: R, Durgadoss
> >> Cc: Zhang, Rui; linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org;
> >> hongbo.zhang@...aro.org
> >> Subject: Re: [PATCH 0/8] Thermal Framework Enhancements
> >>
> >> On 12/18/2012 05:29 PM, Durgadoss R wrote:
> >> > This patch is a v1 based on the RFC submitted here:
> >> > https://patchwork.kernel.org/patch/1758921/
> >> >
> >> > This patch set is based on Rui's -thermal tree, and is
> >> > tested on a Core-i5 and an Atom netbook.
> >> >
> >> > This series contains 8 patches:
> >> > Patch 1/8: Creates new sensor level APIs
> >> > Patch 2/8: Creates new zone level APIs. The existing tzd structure is
> >> >            kept as such for clarity and compatibility purposes.
> >> > Patch 3/8: Creates functions to add/remove a cdev to/from a zone. The
> >> >            existing tcd structure need not be modified.
> >> > Patch 4/8: Adds a thermal_trip sysfs node, which exposes various trip
> >> >            points for all sensors present in a zone.
> >> > Patch 5/8: Adds a thermal_map sysfs node. It is a compact
> representation
> >> >            of the binding relationship between a sensor and a cdev,
> >> >            within a zone.
> >> > Patch 6/8: Creates Documentation for the new APIs. A new file is
> >> >            created for clarity. Final goal is to merge with the existing
> >> >            file or refactor the files, as whatever seems appropriate.
> >> > Patch 7/8: Make PER ZONE values configurable through Kconfig
> >> > Patch 8/8: A dummy driver that can be used for testing. This is not for
> >> merge.
> >>
> >> I read these patches, they create new APIs and sysfs, but it seems they
> >> didn't use the thermal_zone to handle the thermal_throttle issue,
> >> something like update thermal_zone, update temperature, handle
> >> governors
> >> when cross the trip temp. So will you send out next serial patches for
> >> these implementation?
> >
> > Yes, once these get into Rui's tree, we will start migrating the existing
> drivers/
> > and governors, to get things working.
> Durgadoss,
> See function psy_register_thermal() in power_supply_core.c,
> thermal_zone_device_register() is used here, what will this look like
> in future?

Yes, I know this code.
This will be a thermal_sensor_register.
Basically this will expose battery's temperature as a 'sensor'
under /sys/class/thermal/.

Then, each platform can add it to whatever zone they like to.

Thanks,
Durga
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