linux-kernel - Re: [PATCH v2 07/10] dt-bindings: adv748x: add information about serial audio interface (I2S/TDM)

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Message-ID: <CAMuHMdUdVb0LwZDx-MH2FLYYPvgq=uj_3Nrzo9obWAi-Q-2ZnA@mail.gmail.com>
Date:   Fri, 20 Mar 2020 09:48:14 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Alex Riesen <alexander.riesen@...itec.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        driverdevel <devel@...verdev.osuosl.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v2 07/10] dt-bindings: adv748x: add information about
 serial audio interface (I2S/TDM)

Hi Alex,

On Fri, Mar 20, 2020 at 9:44 AM Alex Riesen
<alexander.riesen@...itec.com> wrote:
> Laurent Pinchart, Thu, Mar 19, 2020 19:01:25 +0100:
> > On Thu, Mar 19, 2020 at 06:42:36PM +0100, Alex Riesen wrote:
> > > As the driver has some support for the audio interface of the device,
> > > the bindings file should mention it.

> > > @@ -16,6 +18,8 @@ Required Properties:
> > >      slave device on the I2C bus. The main address is mandatory, others are
> > >      optional and remain at default values if not specified.
> > >
> > > +  - #clock-cells: must be <0> if the I2S port is used
> >
> > Wouldn't it be simpler to set it to 0 unconditionally ?
>
> Would it? If the port itself is optional, shouldn't the clock be an option
> too?

You'd be surprised how many board designers would consider this a cheap
12.288 MHz clock source, without using the I2S port ;-)

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds