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

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Date:	Fri, 14 Mar 2014 11:47:50 +0100
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Chanwoo Choi <cw00.choi@...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

On Friday, March 14, 2014 12:14:03 PM Chanwoo Choi wrote:
> 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.

Everything is okay, I just noted that since there are no users of this
driver currently (the only user was NURI and it was removed by DT
conversion of mach-exynos) it should be okay to merge the patch series
quickly once reviewed and acked by the respective maintainers.

> What is more needed?

Users of the driver? ;)

Your patchset adds DT support and fixes to the driver but it doesn't
add actual users of the driver to arch/arm/boot/dts/ files.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

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