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

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Date:   Fri, 20 Mar 2020 17:15:39 +0100
From:   Alex Riesen <alexander.riesen@...itec.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        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 Laurent,

Laurent Pinchart, Fri, Mar 20, 2020 10:59:07 +0100:
> On Fri, Mar 20, 2020 at 10:03:39AM +0100, Alex Riesen wrote:
> > Geert Uytterhoeven, Fri, Mar 20, 2020 09:48:14 +0100:
> > > 
> > > You'd be surprised how many board designers would consider this a cheap
> > > 12.288 MHz clock source, without using the I2S port ;-)
> > 
> > Well, I am :-)
> > 
> > Especially considering that the driver will not switch the MCLK pin aktive
> > (all I2S-related pins are tristate by default).
> 
> If the MCLK can't be output without enabling the I2S then I don't mind
> if we make the #clock-cells optional, although, as Geert mentioned,
> someone may still want to use it.

So I settled on just removing the option.

> > And how do I require it to be set unconditionally? By just removing the
> > "if ..." part of the statement?
> 
> Yes. For YAML it's easy too, the hard part is making properties
> conditional :-)

Converting it into YAML turned out a bit more than just reformatting:
some of the explicit bindings schema is only implied in the text format :-(

Takes a while to find out what is what.

Regards,
Alex