From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>,
ALSA Development Mailing List <alsa-devel@alsa-project.org>,
Irina Tirdea <irina.tirdea@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Michael Turquette <mturquette@baylibre.com>,
"x86@kernel.org" <x86@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Takashi Iwai <tiwai@suse.com>,
platform-driver-x86@vger.kernel.org,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>, Mark Brown <broonie@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Darren Hart <dvhart@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>, Len Brown <lenb@kernel.org>,
linux-clk@vger.kernel.org,
Pierre-Louis Bossart <pierre-louis.bossart@intel.com>
Subject: Re: [alsa-devel] [PATCH v6 1/3] clk: x86: Add Atom PMC platform clocks
Date: Fri, 16 Dec 2016 08:57:16 -0600 [thread overview]
Message-ID: <07206bf1-2fab-0bbe-6e1b-762e55f62363@linux.intel.com> (raw)
In-Reply-To: <CAHp75Vf7Sfq3_mSb6xf0NHutq8tO1y7Rhi7opDkomu+-vQZCYw@mail.gmail.com>
On 12/16/16 2:46 AM, Andy Shevchenko wrote:
> On Fri, Dec 16, 2016 at 7:15 AM, Pierre-Louis Bossart
> <pierre-louis.bossart@linux.intel.com> wrote:
>> Hi Stephen,
>>
>> can you elaborate on the last comment?
>
> Please don't do top posting.
>
>>>> devm_kasprintf()
>>>
>>> Please no.
>
> That's why I used modal verb "might" instead of "would".
>
>>> It's all local to this function, devm isn't helping anything.
>>> Having one kfree() would be good though. And using init.name for
>>> the clkdev lookup is probably wrong and should be replaced with
>>> something more generic along with an associated device name.
>>
>> I am not sure I understand this last comment.
>> init.name is not a constant, it's made of the "pmc_plt_clk_" string
>> concatenated with an id which directly maps to which hardware clock is
>> registered. Clients use devm_clk_get() with a "pmc_plt_clk_<n>" argument.
>
> Giving more thoughts about design and use of this I would propose to
> do the following.
>
> 1. Create under clock framework something like clk-pmc-atom clock
> driver (see, for example, clk-fractional-divider, though this one
> should indeed go under x86 folder).
apart from the name the current code already does this with code in
drivers/clk/x86
> 2. In real provider, i.e. pmc_atom, create the necessary clock tree
> with *names*.
>
> Scheme with ID is fragile, imagine another version of PMC where
> ordering would be mixed up? It's not hypothetical since we used to
> have this already in pmc_atom for some registers and bits.
I don't want to deal with hypothetical stuff happening to legacy
hardware. If there is a problem at some point, it's no big deal to add a
platform-dependent lookup table and change the registers being accessed.
next prev parent reply other threads:[~2016-12-16 14:58 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
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 [this message]
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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