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

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Date:	Thu, 26 May 2016 07:46:40 -0500
From:	Rob Herring <robh@...nel.org>
To:	Gabriel Fernandez <gabriel.fernandez@...aro.org>
Cc:	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
	Maxime Coquelin <maxime.coquelin@...com>,
	Patrice Chotard <patrice.chotard@...com>,
	Russell King <linux@...linux.org.uk>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Olivier Bideau <olivier.bideau@...com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Pankaj Dev <pankaj.dev@...com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	Arnd Bergmann <arnd@...db.de>,
	Thierry Reding <treding@...dia.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kernel@...inux.com" <kernel@...inux.com>,
	linux-clk <linux-clk@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>,
	Peter Griffin <peter.griffin@...aro.org>,
	Arnaud POULIQUEN <arnaud.pouliquen@...com>,
	Benjamin GAIGNARD <benjamin.gaignard@...com>,
	Vincent ABRIOU <vincent.abriou@...com>
Subject: Re: [PATCH 02/11] drivers: clk: st: Add clock propagation for audio clocks

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.
>> >
>> > Signed-off-by: Olivier Bideau <olivier.bideau@...com>
>> > Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...aro.org>
>> > ---
>> >  .../devicetree/bindings/clock/st/st,flexgen.txt    |  1 +
>> >  drivers/clk/st/clk-flexgen.c                       | 24 ++++++++++++++++++++++
>> >  2 files changed, 25 insertions(+)
>> >
>> > diff --git a/Documentation/devicetree/bindings/clock/st/st,flexgen.txt b/Documentation/devicetree/bindings/clock/st/st,flexgen.txt
>> > index b7ee5c7..15b33c7 100644
>> > --- a/Documentation/devicetree/bindings/clock/st/st,flexgen.txt
>> > +++ b/Documentation/devicetree/bindings/clock/st/st,flexgen.txt
>> > @@ -60,6 +60,7 @@ This binding uses the common clock binding[2].
>> >  Required properties:
>> >  - compatible : shall be:
>> >    "st,flexgen"
>> > +  "st,stih407-clkgend0", "st,flexgen" (enable clock propagation on parent)
>>
>> What do "d0" and "d2" refer to?
>>
>> This seems to indicate you have too much clock detail in the DT (with
>> individual clocks described) or not enough with genericish compatible
>> strings. What happens for the mext clock you need to adjust the flags
>> on? You should be able to make these adjustments without DT updates.
>> Perhaps you need a wider fixing of clock compatible strings.
>>
>> Rob
>
> Sorry i sent my response in html...
>
> Hi Rob,
>
> Thanks for reviewing.
>
> Can i remove
> "
> st,stih407-clkgend0" & "
> st,stih407-clkgend2" compatible strings and add proprieties instead ?
> I only need to activate 2 features and then we can keep generic
> compatible strings.

That is no different and suffers the same point I raised. It requires
updating the DT for any clock configuration change or enhancement.

Rob