linux-kernel - Re: [PATCH v2 4/6] dt-bindings: misc: atmel-ssc: LRCLK from TF/RF pin option

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Date:   Wed, 28 Aug 2019 15:02:52 +0200
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Rob Herring <robh@...nel.org>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Arnd Bergmann <arnd@...db.de>,
        Chas Williams <3chas3@...il.com>,
        Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Takashi Iwai <tiwai@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/6] dt-bindings: misc: atmel-ssc: LRCLK from TF/RF
 pin option

On Tue, Aug 27, 2019 at 05:37:16PM -0500, Rob Herring wrote:
> On Sat, Aug 24, 2019 at 10:26:55PM +0200, Michał Mirosław wrote:
> > Add single-pin LRCLK source options for Atmel SSC module.
> > 
> > Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> > 
> > ---
> >   v2: split from implementation patch
> > 
> > ---
> >  Documentation/devicetree/bindings/misc/atmel-ssc.txt | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/misc/atmel-ssc.txt b/Documentation/devicetree/bindings/misc/atmel-ssc.txt
> > index f9fb412642fe..c98e96dbec3a 100644
> > --- a/Documentation/devicetree/bindings/misc/atmel-ssc.txt
> > +++ b/Documentation/devicetree/bindings/misc/atmel-ssc.txt
> > @@ -24,6 +24,11 @@ Optional properties:
> >         this parameter to choose where the clock from.
> >       - By default the clock is from TK pin, if the clock from RK pin, this
> >         property is needed.
> > +  - atmel,lrclk-from-tf-pin: bool property.
> > +  - atmel,lrclk-from-rf-pin: bool property.
> > +     - SSC in slave mode gets LRCLK from RF for receive and TF for transmit
> > +       data direction. This property makes both use single TF (or RF) pin
> > +       as LRCLK. At most one can be present.
> 
> A single property taking 1 of possible 2 values would prevent the error 
> of more than 1 property present.

It still would need a validation check in the code, though: you
could put wrong value then.  It seems more consistent with the
existing parameters to have two bool properties.

Best Regards,
Michał Mirosław