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Message-ID: <CAJ0PZbSe9dXdaRewwFP5UjNeOCby2EsayU4vDcQEKi5Z4SqtvA@mail.gmail.com>
Date:	Wed, 13 Nov 2013 11:33:14 +0900
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	Yadwinder Singh Brar <yadi.brar01@...il.com>
Cc:	Yadwinder Singh Brar <yadi.brar@...sung.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Tomasz Figa <t.figa@...sung.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, Jean Pihet <j-pihet@...com>
Subject: Re: [RFC 0/4] Add basic support for ASV

On Mon, Nov 11, 2013 at 11:27 PM, Yadwinder Singh Brar
<yadi.brar01@...il.com> wrote:
> gentle ping for suggestions/reviews ..
>
>
> On Wed, Sep 11, 2013 at 8:14 PM, Yadwinder Singh Brar
> <yadi.brar@...sung.com> wrote:
>> This series is to add basic common infrastructure for ASV.
>>  Basically ASV is a technique used on samsung SoCs, which provides the
>> recommended supply voltage for dvfs of arm, mif etc. For a given operating
>> frequency, the voltage is recommended based on SoC's ASV group.
>> ASV group gets fussed on SoCs during process of mass production.

ASV is an instance of AVS. Please recondier and try to reuse
what's already there (drivers/power/avs)

Quote from drivers/power/avs/Kconfig:
          "At a given operating point the voltage is adapted depending on
          static factors (chip manufacturing process) and dynamic factors
          (temperature depending performance)."
It seems that the current ASV is subset of AVS.
Although the current implementation of AVS does not provide significant
infrastructure to its sisters, we may start by sharing the directory.

Added Jean Pihet, who has submitted AVS (TI).

Cheers,
MyungJoo.

>>
>> This series includes:
>>  - basic common infrastructue for ASV. It provides common APIs for user drivers
>> like cpufreq & devfreq and and an interface for SoC specific drivers to
>> register ASV members(instances)
>>  - a common platform driver to register ASV members for exynos SoCs
>>  - an example providing minimal support (only for ARM ASV) for exynos5250 chips
>>
>> Its just basic skelton which I wanted to get it reviewed or discussed in
>> early stage, before going ahead on further development based on it.
>>  Presently example is based on static ASV table provided in SoC specific file,
>> which I expects to go into DT. But exactly how and where needs to be discussed,
>> may be in next revisions once we get through the basic skelton.
>>  Also the location of driver in kernel may also seem odd to someone and
>> many more things :).
>>
>> Looking for your valuable reviews and suggestions.
>>
>> Thanks
>>
>> Yadwinder Singh Brar (4):
>>   power: asv: Add common ASV support for samsung SoCs
>>   power: asv: Add a common asv driver for exynos SoCs.
>>   power: asv: Add support for exynos5250
>>   arm: exynos5: Register static platform device for ASV.
>>
>>  arch/arm/mach-exynos/mach-exynos5-dt.c   |    3 +
>>  drivers/power/Kconfig                    |    1 +
>>  drivers/power/Makefile                   |    1 +
>>  drivers/power/asv/Kconfig                |   24 ++++
>>  drivers/power/asv/Makefile               |    2 +
>>  drivers/power/asv/exynos-asv.c           |   81 ++++++++++++++
>>  drivers/power/asv/exynos-asv.h           |   22 ++++
>>  drivers/power/asv/exynos5250-asv.c       |  141 ++++++++++++++++++++++++
>>  drivers/power/asv/samsung-asv.c          |  175 ++++++++++++++++++++++++++++++
>>  include/linux/power/samsung-asv-driver.h |   61 +++++++++++
>>  include/linux/power/samsung-asv.h        |   37 +++++++
>>  11 files changed, 548 insertions(+), 0 deletions(-)
>>  create mode 100644 drivers/power/asv/Kconfig
>>  create mode 100644 drivers/power/asv/Makefile
>>  create mode 100644 drivers/power/asv/exynos-asv.c
>>  create mode 100644 drivers/power/asv/exynos-asv.h
>>  create mode 100644 drivers/power/asv/exynos5250-asv.c
>>  create mode 100644 drivers/power/asv/samsung-asv.c
>>  create mode 100644 include/linux/power/samsung-asv-driver.h
>>  create mode 100644 include/linux/power/samsung-asv.h
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@...ts.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
> _______________________________________________
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> linux-arm-kernel@...ts.infradead.org
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-- 
MyungJoo Ham, Ph.D.
System S/W Lab, S/W Center, Samsung Electronics
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