Re: [PATCH v4 0/5] exynos: Move pmu driver to driver/soc folder and add exynos7 support

[amit daniel kachhap <amit.daniel@samsung.com>]

On Mon, Nov 24, 2014 at 6:50 PM, Bartlomiej Zolnierkiewicz
<b.zolnierkie@samsung.com> wrote:
>
> Hi,
>
> On Monday, November 24, 2014 07:36:10 AM Amit Daniel Kachhap wrote:
>> This patch series [1 - 5] performs,
>>
>> 1) Moves pmu driver to driver/soc/samsung folder. This is needed as exynos7 is
>>    an arm64 based platform and hence PMU driver should be in driver folder.
>>    Some discussion happened about this in the v1 version. Finally adding it in
>>    driver/soc folder as it too SoC specific and not a general driver.
>>    Entire discussion can be found here (A).
>> 2) Add exynos7 PMU support.
>
> Some months ago (when the work on moving PMU driver out of mach-exynos
> started) I asked how much code would be shared between arm32 and arm64
> SoCs.  Now it seems that the code in question is minimal so I still
> wonder whether it is really worth to have a common driver (please note
> that in case of arm32 kernel all arm64 PMU code is just a dead code,
> similarly for arm64 kernel and arm32 PMU code).  Would it be possible
> to do the analysis of the additional source code needed vs saved code
> in the resulting binary for the case of having separate drivers?
yes your suggestion is good. It may done by keeping the data pmu_config[]
arrays in .h file under CONFIG_ARM(or CONFIG_ARM64) and NULL for non required
platforms. Keep them in 2 separate files may be confusing.

>
> Could you also please take a look into fixing patch #4 to be compatible
> with http://lkml.iu.edu/hypermail/linux/kernel/1407.1/00298.html ?
This patch makes sense. Thanks for pointing out.
> (It seems that just adding separate struct exynos_pmu_conf_extra for
> ->pmu_config_extra shold be okay.)
Yes right struct exynos_pmu_conf_extra should work for exynos7.

I think both of the above optimizations may go as a separate patch.

Regards,
Amit D
>
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
>
>> 3) Enables the driver for 32bit arm exynos platforms.
>>
>> Changes from V3:
>> * Fixed Kconfig as per Russell feedback
>> * Rebased the series against Pankaj SoC restart consolidation patches (D) as per
>>   Kukjin request.
>> * Link to V3 can be found here (C)
>>
>> Changes from V2:
>> * Added review comment changes suggested by Pankaj.
>> * Removed mfd client support in this patch series. This will be added later in
>>   the power domain patch series.
>> * Link to V2 can be found here (B)
>>
>> Changes from V1:
>> * Move pmu driver in driver/soc/samsung folder
>> * Removed the power domain features. They will posted as a separate series.
>> * Added exynos7 PMU support.
>> * Link to v1 can be found here (A)
>>
>> This complete patch series is rebased on Kukjin for-next tree.
>>
>> (A) - http://www.spinics.net/lists/linux-samsung-soc/msg38442.html
>> (B) - http://www.spinics.net/lists/arm-kernel/msg375910.html
>> (C) - http://www.spinics.net/lists/linux-samsung-soc/msg39237.html
>> (D) - http://www.spinics.net/lists/linux-samsung-soc/msg39095.html
>>
>> Amit Daniel Kachhap (5):
>>   ARM: EXYNOS: Move pmu specific header files under "linux/soc/samsung"
>>   drivers: soc: Add support for Exynos PMU driver
>>   driver: soc: exynos-pmu: Add an API to be called after wakeup
>>   drivers: soc: exynos-pmu: Add support for Exynos7
>>   arm: exynos: Select SOC_SAMSUNG config option
>>
>>  .../devicetree/bindings/arm/samsung/pmu.txt        |    1 +
>>  arch/arm/mach-exynos/Kconfig                       |    1 +
>>  arch/arm/mach-exynos/Makefile                      |    2 +-
>>  arch/arm/mach-exynos/exynos.c                      |    2 +-
>>  arch/arm/mach-exynos/mcpm-exynos.c                 |    2 +-
>>  arch/arm/mach-exynos/platsmp.c                     |    2 +-
>>  arch/arm/mach-exynos/pm.c                          |    4 +-
>>  arch/arm/mach-exynos/suspend.c                     |    4 +-
>>  drivers/soc/Kconfig                                |    1 +
>>  drivers/soc/Makefile                               |    1 +
>>  drivers/soc/samsung/Kconfig                        |   20 +
>>  drivers/soc/samsung/Makefile                       |    1 +
>>  .../pmu.c => drivers/soc/samsung/exynos-pmu.c      |  442 +++++++++++++++++++-
>>  .../linux/soc/samsung}/exynos-pmu.h                |    1 +
>>  .../linux/soc/samsung/exynos-regs-pmu.h            |  273 ++++++++++++
>>  15 files changed, 744 insertions(+), 13 deletions(-)
>>  create mode 100644 drivers/soc/samsung/Kconfig
>>  create mode 100644 drivers/soc/samsung/Makefile
>>  rename arch/arm/mach-exynos/pmu.c => drivers/soc/samsung/exynos-pmu.c (64%)
>>  rename {arch/arm/mach-exynos => include/linux/soc/samsung}/exynos-pmu.h (89%)
>>  rename arch/arm/mach-exynos/regs-pmu.h => include/linux/soc/samsung/exynos-regs-pmu.h (63%)
>
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