linux-kernel - Re: [STLinux Kernel] [PATCH 02/11] drivers: clk: st: Add clock propagation for audio clocks

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Date:	Mon, 30 May 2016 09:30:06 +0200
From:	Gabriel Fernandez <gabriel.fernandez@...aro.org>
To:	Rob Herring <robh@...nel.org>,
	Michael Turquette <mturquette@...libre.com>
Cc:	loic pallardy <loic.pallardy@...com>,
	Mark Rutland <mark.rutland@....com>,
	"kernel@...inux.com" <kernel@...inux.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrzej Hajda <a.hajda@...sung.com>,
	linux-clk <linux-clk@...r.kernel.org>,
	Benjamin GAIGNARD <benjamin.gaignard@...com>,
	Olivier Bideau <olivier.bideau@...com>,
	Russell King <linux@...linux.org.uk>,
	Thierry Reding <treding@...dia.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Vincent ABRIOU <vincent.abriou@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Kumar Gala <galak@...eaurora.org>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>
Subject: Re: [STLinux Kernel] [PATCH 02/11] drivers: clk: st: Add clock
 propagation for audio clocks

On 27 May 2016 at 17:41, Rob Herring <robh@...nel.org> wrote:
> On Fri, May 27, 2016 at 09:23:20AM +0200, loic pallardy wrote:
>>
>>
>> On 05/26/2016 03:20 PM, Rob Herring wrote:
>> >On Thu, May 26, 2016 at 8:05 AM, loic pallardy <loic.pallardy@...com> wrote:
>> >>
>> >>
>> >>On 05/26/2016 02:46 PM, Rob Herring wrote:
>> >>>
>> >>>On Thu, May 26, 2016 at 4:49 AM, Gabriel Fernandez
>> >>><gabriel.fernandez@...aro.org> wrote:
>> >>>>
>> >>>>On 25 May 2016 at 19:24, Rob Herring <robh@...nel.org> wrote:
>> >>>>>
>> >>>>>
>> >>>>>On Wed, May 18, 2016 at 10:41:23AM +0200, Gabriel Fernandez wrote:
>> >>>>>>
>> >>>>>>This patch allows fine tuning of the quads FS for audio clocks
>> >>>>>>accuracy.
>> >>>>>>
>
>> >>>
>> >>>That is no different and suffers the same point I raised. It requires
>> >>>updating the DT for any clock configuration change or enhancement.
>> >>>
>> >>Agree with you, DT update is needed as soon as a clock configuration should
>> >>be changed. This is due to STiH clock driver design based on DT description
>> >>of SoC clock tree.
>> >>
>> >>This clock driver was accepted 2 years ago. At the time being there was
>> >>discussion about clock tree description location: driver or DT.
>> >>Bad choice was done for this driver...
>> >>
>> >>If we decide to redesign STiH clock driver using in-driver clock tree
>> >>description, this will modify STiH clock DT nodes description and so break
>> >>DT backward compatibility.
>> >>
>> >>What's from your pov the best option?
>> >
>> >You can break it once or every time you need a clock change. I'd go
>> >with the former. Maybe more specific compatible strings throughout
>> >alone would be enough rather than a flag day changing the binding.
>>
>> So if I understand you correctly, main issue is d0 and d2 signification.
>> d0 and d2 are indeed location of the flexgen in the SoC. But that's right
>> flexgen are dedicated to clocks generation for features (system, audio,
>> video).
>> What about "st,flexgen-audio" and "st,flexgen-video"?
>
> It is not so much the name of these 2, but whether there are other cases
> for different clock nodes that could need the same thing. If so, update
> them all now rather than 1 by 1.
>
> Rob

Hi Rob,
Ok i will send a V2 for that.

Mike,
the first patch "drivers: clk: st: Add fs660c32 synthesizer algorithm"  can
be taken into account regardless the remark of Rob. Can you have a look ?

Thanks.
Best Regards

Gabriel