linux-kernel - RE: [PATCHv3 0/8] Thermal Framework Enhancements

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Message-ID: <4D68720C2E767A4AA6A8796D42C8EB59D4DA0E@BGSMSX101.gar.corp.intel.com>
Date:	Fri, 30 Aug 2013 13:21:06 +0000
From:	"R, Durgadoss" <durgadoss.r@...el.com>
To:	Eduardo Valentin <eduardo.valentin@...com>
CC:	"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>,
	"hongbo.zhang@...aro.org" <hongbo.zhang@...aro.org>,
	"wni@...dia.com" <wni@...dia.com>
Subject: RE: [PATCHv3 0/8] Thermal Framework Enhancements

> -----Original Message-----
> From: linux-pm-owner@...r.kernel.org [mailto:linux-pm-
> owner@...r.kernel.org] On Behalf Of Eduardo Valentin
> Sent: Friday, August 30, 2013 6:04 PM
> To: R, Durgadoss
> Cc: Eduardo Valentin; Zhang, Rui; linux-pm@...r.kernel.org; linux-
> kernel@...r.kernel.org; hongbo.zhang@...aro.org; wni@...dia.com
> Subject: Re: [PATCHv3 0/8] Thermal Framework Enhancements
> 
> On 30-08-2013 05:20, R, Durgadoss wrote:
> > Hi Eduardo,
> >
> >> -----Original Message-----
> >> From: Eduardo Valentin [mailto:eduardo.valentin@...com]
> >> Sent: Friday, August 30, 2013 1:08 AM
> >> To: R, Durgadoss
> >> Cc: Zhang, Rui; linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org;
> >> eduardo.valentin@...com; hongbo.zhang@...aro.org; wni@...dia.com
> >> Subject: Re: [PATCHv3 0/8] Thermal Framework Enhancements
> >>
> >> Durga,
> >>
> >> On 05-02-2013 06:46, Durgadoss R wrote:
> >>> This patch set is a v3 of the previous versions submitted here:
> >>> [v2]: http://lwn.net/Articles/531720/
> >>> [v1]: https://lkml.org/lkml/2012/12/18/108
> >>> [RFC]:https://patchwork.kernel.org/patch/1758921/
> >>>
> >>
> >> Long time this work is not moving forward. While writing the device tree
> >
> > I am trying my best to get to this,
> > Will try to refresh in a couple of weeks.
> >
> >> parser, I thought of using your work as baseline to see how the multiple
> >> sensor per zone would look like (also in DT).
> >>
> >> But while checking your code again, I realized that you are actually
> >> creating a new API, that is probably why you named it sysfs-api2. While
> >> I understand the motivation (they are pretty different), I believe this
> >> is not a good thing to do. I would suggest making so that we have a
> >> single API.
> >
> > As in the sensor APIs ? or the zone level APIs ?
> > The sensor level APIs are anyway new; the zone level ones
> > we have to work out a way for them.
> >
> > Is this what you are referring to ? Could you confirm/explain a bit more ?
> 
> OK. Let's assume that maybe I didn't quite get your proposal then. Let
> me step back and ask you what is the relation between existing
> thermal_zone_device and thermal_zone? Would existing drivers be

The existing thermal_zone_device would be a new thermal zone
with one sensor in it.

> complaint with new API?

Okay got it. This is what myself & Rui discussed a while ago to address
this.

When these patches are merged, they will co-exist for some time.
Rui had an idea to write a wrapper on top of these, which will
make the existing drivers complaint with new API. 
This wrapper can be a Kconfig option, to select on what we need;
new/existing APIs.

Thanks,
Durga

> >
> >>
> >>> This patch set is based on Rui's -next tree, and is
> >>> tested on a Core-i5 and an Atom netbook.
> >>>
> >>> Changes since v2:
> >>>  * Reworked the map sysfs attributes in patch [5/8]
> >>>  * Dropped configuration for maximum sensors and
> >>>    cooling devices, through Kconfig.
> >>>  * Added __remove_trip_attr method
> >>>  * Renamed __clean_map_entry to __remove_map_entry
> >>>    for consistency in naming.
> >>> Changes Since v1:
> >>>  * Removed kobject creation for thermal_trip and thermal_map
> >>>    nodes as per Greg-KH's comments.
> >>>  * Added ABI Documentation under 'testing'.
> >>>  * Modified the GET_INDEX macro to be more linux-like, thanks
> >>>    to Joe Perches.
> >>>  * Added get_[sensor/cdev]_by_name APIs to thermal.h
> >>>
> >>> 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 sensorX_trip_[active/passive/hot/critical] sysfs nodes,
> >>> 	   under /sys/class/thermal/zoneY/. This exposes various trip
> >>>            points for sensorX present in zoneY.
> >>> Patch 5/8: Adds mapY_* sysfs node. These attributes represent
> >>>            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: Add ABI documentation for sysfs interfaces introduced in this
> patch.
> >>> Patch 8/8: A dummy driver that can be used for testing. This is not for merge.
> >>>
> >>> Durgadoss R (8):
> >>>   Thermal: Create sensor level APIs
> >>>   Thermal: Create zone level APIs
> >>>   Thermal: Add APIs to bind cdev to new zone structure
> >>>   Thermal: Add trip point sysfs nodes for sensor
> >>>   Thermal: Create Thermal map sysfs attributes for a zone
> >>>   Thermal: Add Documentation to new APIs
> >>>   Thermal: Add ABI Documentation for sysfs interfaces
> >>>   Thermal: Dummy driver used for testing
> >>>
> >>>  Documentation/ABI/testing/sysfs-class-thermal |  137 ++++
> >>>  Documentation/thermal/sysfs-api2.txt          |  247 ++++++
> >>>  drivers/thermal/Kconfig                       |    5 +
> >>>  drivers/thermal/Makefile                      |    2 +
> >>>  drivers/thermal/thermal_sys.c                 |  994
> +++++++++++++++++++++++++
> >>>  drivers/thermal/thermal_test.c                |  324 ++++++++
> >>>  include/linux/thermal.h                       |  123 ++-
> >>>  7 files changed, 1831 insertions(+), 1 deletion(-)
> >>>  create mode 100644 Documentation/ABI/testing/sysfs-class-thermal
> >>>  create mode 100644 Documentation/thermal/sysfs-api2.txt
> >>>  create mode 100644 drivers/thermal/thermal_test.c
> >>>
> >>
> >>
> >> --
> >> You have got to be excited about what you are doing. (L. Lamport)
> >>
> >> Eduardo Valentin
> >
> >
> >
> 
> 
> --
> You have got to be excited about what you are doing. (L. Lamport)
> 
> Eduardo Valentin

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