linux-kernel - Re: [PATCH v6 1/3] clk: x86: Add Atom PMC platform clocks

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Date:   Mon, 12 Dec 2016 18:15:09 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Irina Tirdea <irina.tirdea@...el.com>
Cc:     linux-clk@...r.kernel.org, "x86@...nel.org" <x86@...nel.org>,
        platform-driver-x86@...r.kernel.org,
        Stephen Boyd <sboyd@...eaurora.org>,
        Darren Hart <dvhart@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Turquette <mturquette@...libre.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        ALSA Development Mailing List <alsa-devel@...a-project.org>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/3] clk: x86: Add Atom PMC platform clocks


> 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@...el.com>
>> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.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?

[snip]
>
>> +#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

Darren, did we get your proposal right?

>
> 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)