[PATCH v7] power: introduce library for device-specific OPPs

[Kevin Hilman]

"Rafael J. Wysocki" <rjw at sisk.pl> writes:

> On Friday, October 08, 2010, Nishanth Menon wrote:
>> SoCs have a standard set of tuples consisting of frequency and
>> voltage pairs that the device will support per voltage domain. These
>> are called Operating Performance Points or OPPs. The actual
>> definitions of OPP varies over silicon versions. For a specific domain,
>> we can have a set of {frequency, voltage} pairs. As the kernel boots
>> and more information is available, a default set of these are activated
>> based on the precise nature of device. Further on operation, based on
>> conditions prevailing in the system (such as temperature), some OPP
>> availability may be temporarily controlled by the SoC frameworks.
>> 
>> To implement an OPP, some sort of power management support is necessary
>> hence this library depends on CONFIG_PM.
>> 
>> Contributions include:
>> Sanjeev Premi for the initial concept:
>> 	http://patchwork.kernel.org/patch/50998/
>> Kevin Hilman for converting original design to device-based
>> Kevin Hilman and Paul Walmsey for cleaning up many of the function
>> abstractions, improvements and data structure handling
>> Romit Dasgupta for using enums instead of opp pointers
>> Thara Gopinath, Eduardo Valentin and Vishwanath BS for fixes and
>> cleanups.
>> Linus Walleij for recommending this layer be made generic for usage
>> in other architectures beyond OMAP and ARM.
>> Mark Brown, Andrew Morton, Rafael J Wysocki, Paul E McKenney for valuable
>> improvements.
>> 
>> Discussions and comments from:
>> http://marc.info/?l=linux-omap&m=126033945313269&w=2
>> http://marc.info/?l=linux-omap&m=125482970102327&w=2
>> http://marc.info/?t=125809247500002&r=1&w=2
>> http://marc.info/?l=linux-omap&m=126025973426007&w=2
>> http://marc.info/?t=128152609200064&r=1&w=2
>> http://marc.info/?t=128468723000002&r=1&w=2
>> incorporated.
>> 
>> Cc: Benoit Cousson <b-cousson at ti.com>
>> Cc: Madhusudhan Chikkature Rajashekar <madhu.cr at ti.com>
>> Cc: Phil Carmody <ext-phil.2.carmody at nokia.com>
>> Cc: Roberto Granados Dorado <x0095451 at ti.com>
>> Cc: Santosh Shilimkar <santosh.shilimkar at ti.com>
>> Cc: Sergio Alberto Aguirre Rodriguez <saaguirre at ti.com>
>> Cc: Tero Kristo <Tero.Kristo at nokia.com>
>> Cc: Eduardo Valentin <eduardo.valentin at nokia.com>
>> Cc: Paul Walmsley <paul at pwsan.com>
>> Cc: Sanjeev Premi <premi at ti.com>
>> Cc: Thara Gopinath <thara at ti.com>
>> Cc: Vishwanath BS <vishwanath.bs at ti.com>
>> Cc: Linus Walleij <linus.walleij at stericsson.com>
>> Cc: Mark Brown <broonie at opensource.wolfsonmicro.com>
>> Cc: Andrew Morton <akpm at linux-foundation.org>
>> Cc: Rafael J. Wysocki <rjw at sisk.pl>
>> Cc: Paul E. McKenney <paulmck at linux.vnet.ibm.com>
>> 
>> Signed-off-by: Nishanth Menon <nm at ti.com>
>
> OK
>
> Your error messages are a bit inconsistent (e.g. some of them print the
> error code while others don't), but I guess I can fix that up.
>
> Still, to apply the patch I need a copyright notice for the doc too.
>
>> Signed-off-by: Kevin Hilman <khilman at deeprootsystems.com>
>
> Kevin, your sign-off here means you endorse the patch as the maintainer.
> Is that correct?

Correct.

Thanks,

Kevin