From: Darren Hart <dvhart@infradead.org>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
Irina Tirdea <irina.tirdea@intel.com>,
linux-clk@vger.kernel.org, "x86@kernel.org" <x86@kernel.org>,
platform-driver-x86@vger.kernel.org,
Stephen Boyd <sboyd@codeaurora.org>,
Thomas Gleixner <tglx@linutronix.de>,
Michael Turquette <mturquette@baylibre.com>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
ALSA Development Mailing List <alsa-devel@alsa-project.org>,
Mark Brown <broonie@kernel.org>, Takashi Iwai <tiwai@suse.com>,
Pierre-Louis Bossart <pierre-louis.bossart@intel.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v6 1/3] clk: x86: Add Atom PMC platform clocks
Date: Fri, 16 Dec 2016 10:36:07 -0800 [thread overview]
Message-ID: <20161216183607.GB44199@f23x64.localdomain> (raw)
In-Reply-To: <CAHp75VccDyiLhWxZYg+d0usrwhfa_hiZAJCKPXXVRod=tB803g@mail.gmail.com>
On Tue, Dec 13, 2016 at 02:26:21AM +0200, Andy Shevchenko wrote:
> On Tue, Dec 13, 2016 at 2:15 AM, Pierre-Louis Bossart
> <pierre-louis.bossart@linux.intel.com> wrote:
> >
> >> Thanks for an update I will comment all the patches.
> >> Here we start.
> >
> >
> > Thanks Andy for the review. Two quick comments before going further in the
> > details later.
> >
> >>
> >>> The BayTrail and CherryTrail platforms provide platform clocks
> >>> through their Power Management Controller (PMC).
> >>>
> >>> The SoC supports up to 6 clocks (PMC_PLT_CLK[5:0]) with a
> >>> frequency of either 19.2 MHz (PLL) or 25 MHz (XTAL) for BayTrail
> >>> and a frequency of 19.2 MHz (XTAL) for CherryTrail. These clocks
> >>> are available for general system use, where appropriate, and each
> >>> have Control & Frequency register fields associated with them.
> >>>
> >>> Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
> >>> Signed-off-by: Pierre-Louis Bossart
> >>> <pierre-louis.bossart@linux.intel.com>
> >>
> >>
> >> Who is the actual author? SoB I guess should be either the author, or
> >> 1st, 2nd, ..., last one who is submitter.
> >
> >
> > I ported the initial code from Android legacy stuff and Irina ported the
> > functionality to the clk framework. It seems appropriate to have both
> > signed-offs?
>
> Yes, but as I mentioned:
> 1) submitter goes last;
> 2) SoB lines and Author(s) should reflect actual state of the sources.
> If patch has 2 SoBs I'm expecting see different names of Authors in
> the source code. *Or* in some cases it's possible to explain in the
> commit message why you have former SoB and for what the credit that
> person(s) get.
>
> >>> +#include <linux/platform_data/x86/clk-byt-plt.h>
> >
> >
> > This was a suggestion of Darren Hart in agreement with Thomas Gleixner.
> > see
> > http://mailman.alsa-project.org/pipermail/alsa-devel/2016-October/113936.html
>
> Hmm... Thanks for pointing to this I didn't aware about such details.
>
> But... I still insist that is not a platform data at all in both cases.
>
> For clock I would suggest include/linux/clk/ with x86_ prefix.
> For the rest I have no strong opinion except trying to avoid
> platform_data wording in the path as much as possible.
>
> As an example I could recall DMA engine subsystem where we have
>
> include/linux/platform_data/dma-*.h
>
> and
>
> include/linux/dma/*.h
>
> So, this sounds more to me as
>
> include/linux/x86/pmc_atom.h
There should really be some Documentation about how to choose an include
directory :-)
My understanding is include/linux should be more generic, rather than platform
specific headers. So while platform_data may refer specifically to the platform
bus drivers, it's the closest thing we have to include/platform, which would be
ideal. I would prefer to stick with include/platform_data because:
1) Semantically, it's the closest thing there is
2) include/linux should be for more generic headers related to the OS or
subsystems
3) It doesn't make sense to create a separate include/platform directory for a
single header.
4) We don't want to rename platform_data to platform now and change all the
drivers, but it could be changed later.
Thomas, do you disagree with any of the above?
>
> > Darren, did we get your proposal right?
>
Yes, your submission matches the intent from Thomas and I as I understand it.
> >>
> >> Is it indeed platform data? I would not create platform_data/x86
> >> without strong argument.
> >> Perhaps include/linux/clk/x86_pmc.h? (Yes, I know about clk-lpss.h
> >> which is old enough and was basically first try of clk stuff on x86)
>
> --
> With Best Regards,
> Andy Shevchenko
>
--
Darren Hart
Intel Open Source Technology Center
next prev parent reply other threads:[~2016-12-16 18:39 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-09 18:01 [PATCH v6 0/3] Add platform clock for BayTrail platforms Irina Tirdea
2016-12-09 18:01 ` [PATCH v6 1/3] clk: x86: Add Atom PMC platform clocks Irina Tirdea
2016-12-12 23:39 ` Andy Shevchenko
2016-12-13 0:15 ` Pierre-Louis Bossart
2016-12-13 0:26 ` Andy Shevchenko
2016-12-16 18:36 ` Darren Hart [this message]
2016-12-16 18:49 ` Andy Shevchenko
2016-12-16 19:19 ` Darren Hart
2016-12-16 22:29 ` Andy Shevchenko
2016-12-16 22:58 ` Darren Hart
2016-12-19 11:04 ` Mark Brown
2016-12-13 1:16 ` Andy Shevchenko
2016-12-13 23:25 ` Stephen Boyd
2016-12-16 5:15 ` [alsa-devel] " Pierre-Louis Bossart
2016-12-16 8:46 ` Andy Shevchenko
2016-12-16 14:57 ` Pierre-Louis Bossart
2016-12-17 1:33 ` Stephen Boyd
2016-12-17 13:57 ` Andy Shevchenko
2016-12-19 16:11 ` Pierre-Louis Bossart
2016-12-21 23:05 ` Stephen Boyd
2016-12-22 1:07 ` Pierre-Louis Bossart
2016-12-22 18:29 ` Stephen Boyd
2016-12-22 18:42 ` Andy Shevchenko
2017-01-05 0:54 ` Pierre-Louis Bossart
2016-12-09 18:01 ` [PATCH v6 2/3] arch/x86/platform/atom: Move pmc_atom to drivers/platform/x86 Irina Tirdea
2016-12-12 23:43 ` Andy Shevchenko
2016-12-16 18:20 ` Darren Hart
2016-12-16 18:39 ` Andy Shevchenko
2016-12-09 18:01 ` [PATCH v6 3/3] platform/x86: Enable Atom PMC platform clocks Irina Tirdea
2016-12-13 0:01 ` Andy Shevchenko
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