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

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Date:	Thu, 26 May 2016 11:49:46 +0200
From:	Gabriel Fernandez <gabriel.fernandez@...aro.org>
To:	Rob Herring <robh@...nel.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@...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 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.

e.g.

clk_s_d2_flexgen: clk-s-d2-flexgen {
#clock-cells = <1>;
compatible = "st,flexgen";
        ...
       st-sync-mode;
        st-update
-parent-rate;
};

for d0_flexgen i will enable only st-sync-mode;

Best Regards