linux-kernel - Re: [PATCH v2 4/7] ASoC: dt-bindings: Document dl-mask property

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Date:   Mon, 29 Jul 2019 23:27:17 +0300
From:   Daniel Baluta <daniel.baluta@...il.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     Daniel Baluta <daniel.baluta@....com>,
        Mark Brown <broonie@...nel.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        Mihai Serban <mihai.serban@...il.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Viorel Suman <viorel.suman@....com>,
        Timur Tabi <timur@...nel.org>,
        "S.j. Wang" <shengjiu.wang@....com>,
        "Angus Ainslie (Purism)" <angus@...ea.ca>,
        Takashi Iwai <tiwai@...e.com>,
        dl-linux-imx <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v2 4/7] ASoC: dt-bindings: Document dl-mask property

On Mon, Jul 29, 2019 at 11:15 PM Nicolin Chen <nicoleotsuka@...il.com> wrote:
>
> On Sun, Jul 28, 2019 at 10:24:26PM +0300, Daniel Baluta wrote:
> > SAI supports up to 8 data lines. This property let the user
> > configure how many data lines should be used per transfer
> > direction (Tx/Rx).
>
> This sounds a bit less persuasive to me as we are adding a
> DT property that's used to describe a hardware connections
> and it would be probably better to mention that the mapping
> between the mask and the data lines could be more flexible
> than consecutive active data lines as you said previously.
>
> > Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> > ---
> >  Documentation/devicetree/bindings/sound/fsl-sai.txt | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/sound/fsl-sai.txt b/Documentation/devicetree/bindings/sound/fsl-sai.txt
> > index 2e726b983845..2b38036a4883 100644
> > --- a/Documentation/devicetree/bindings/sound/fsl-sai.txt
> > +++ b/Documentation/devicetree/bindings/sound/fsl-sai.txt
> > @@ -49,6 +49,13 @@ Optional properties:
> >
> >    - big-endian               : Boolean property, required if all the SAI
> >                         registers are big-endian rather than little-endian.
> > +  - fsl,dl-mask              : list of two integers (bitmask, first for RX, second
>
> I am leaving this naming to DT maintainer.
>
> > +                       for TX) representing enabled datalines. Bit 0
> > +                       represents first data line, bit 1 represents second
> > +                       data line and so on. Data line is enabled if
> > +                       corresponding bit is set to 1. By default, if property
> > +                       not present, only dataline 0 is enabled for both
> > +                       directions.
>
> To make this patch more convincing, could we add an example
> as well in the Example section of this binding file? Like:
>         /* RX data lines 0/1 and TX data lines 0/2 are connected */
>         fsl,dl-mask = <0x3 0x5>;

Sure, will add an example.