linux-kernel - Re: [PATCHv2 0/8] devfreq: exynos4: Support dt and use common ppmu driver

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Date:	Fri, 14 Mar 2014 12:14:03 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:	myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
	rafael.j.wysocki@...el.com, nm@...com, pawel.moll@....com,
	mark.rutland@....com, swarren@...dotorg.org,
	ijc+devicetree@...lion.org.uk, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCHv2 0/8] devfreq: exynos4: Support dt and use common ppmu
 driver

Hi,

On 03/14/2014 01:43 AM, Bartlomiej Zolnierkiewicz wrote:
> 
> Hi,
> 
> On Thursday, March 13, 2014 05:17:21 PM Chanwoo Choi wrote:
>> This patchset support devicetree and use common ppmu driver instead of
>> individual code of exynos4_bus.c to remove duplicate code. Also this patchset
>> get the resources for busfreq from dt data by using DT helper function.
>> - PPMU register address
>> - PPMU clock
>> - Regulator for INT/MIF block
>>
>> This patchset use SET_SYSTEM_SLEEP_PM_OPS macro intead of legacy method.
>> To remove power-leakage in suspend state, before entering suspend state,
>> disable ppmu clocks.
>>
>> Changes from v1:
>> - Add exynos4_bus.txt documentation for devicetree guide
>> - Fix probe failure if CONFIG_PM_OPP is disabled
>> - Fix typo and resource leak(regulator/clock/memory) when happening probe failure
>> - Add additionally comment for PPMU usage instead of previous PPC
>> - Split separate patch to remove ambiguous of patch
>>
>> Chanwoo Choi (8):
>>   devfreq: exynos4: Support devicetree to get device id of Exynos4 SoC
>>   devfreq: exynos4: Use common ppmu driver and get ppmu address from dt data
>>   devfreq: exynos4: Add ppmu's clock control and code clean about regulator control
>>   devfreq: exynos4: Fix bug of resource leak and code clean on probe()
>>   devfreq: exynos4: Use SET_SYSTEM_SLEEP_PM_OPS macro
>>   devfreq: exynos4: Fix power-leakage of clock on suspend state
>>   devfreq: exynos4: Add CONFIG_PM_OPP dependency to fix probe fail
>>   devfreq: exynos4: Add busfreq driver for exynos4210/exynos4x12
>>
>>  .../devicetree/bindings/devfreq/exynos4_bus.txt    |  49 +++
>>  drivers/devfreq/Kconfig                            |   1 +
>>  drivers/devfreq/exynos/Makefile                    |   2 +-
>>  drivers/devfreq/exynos/exynos4_bus.c               | 415 ++++++++++++++-------
>>  4 files changed, 341 insertions(+), 126 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/devfreq/exynos4_bus.txt
> 
> Thanks for updating this patchset.  There are still some minor issues
> left though:
> 
> - patch #4 should be at beginning of the patch series
> 
> - moving of devfreq_unregister_opp_notifier(dev, data->devfreq) from
>   exynos4_bus_exit() to exynos4_busfreq_remove() should be in patch #4
>   (which should really be at the beggining of patch series) not #3
> 
> - handling of iounmap(data->ppmu[i].hw_base) should be added to
>   exynos4_bus_exit() in patch #2 not #3
> 
> - patch #8 summary and description should mention fact that it adds DT
>   binding documentation (not the driver itself) and the patch itself
>   can be slighlty polished

OK, I'll re-order the sequence of patchset and modify minior issues about your comment.
Also, I'll modify the patch description for patch8.

> 
> One important note about this patchset not mentioned in the cover
> letter is that it is improving currently unused driver (because of
> DT-only mach-exynos conversion the only user was removed in June 2013
> and from the reading the code I suspect that even that user hadn't
> worked previously).  As such this patch series should not cause any
> regressions.

I don't understand correct your meaning.I explained DT support on upper
patchset description by using DT helper function and I added PPMU descritpion.
Also, Each patch include detailed description of patch content.

What is more needed?

Best Regards,
Chanwoo Choi





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