linux-kernel - Re: [alsa-devel] [PATCH 08/10] ASoC: dt-bindings: Document fcomb

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Date:   Thu, 25 Jul 2019 10:39:19 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Daniel Baluta <daniel.baluta@...il.com>
Cc:     Daniel Baluta <daniel.baluta@....com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Viorel Suman <viorel.suman@....com>,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, "S.j. Wang" <shengjiu.wang@....com>,
        "Angus Ainslie (Purism)" <angus@...ea.ca>,
        Takashi Iwai <tiwai@...e.com>, Mark Brown <broonie@...nel.org>,
        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>,
        Lucas Stach <l.stach@...gutronix.de>
Subject: Re: [alsa-devel] [PATCH 08/10] ASoC: dt-bindings: Document
 fcomb_mode property

On Thu, Jul 25, 2019 at 09:02:22AM +0300, Daniel Baluta wrote:
> On Thu, Jul 25, 2019 at 2:22 AM Nicolin Chen <nicoleotsuka@...il.com> wrote:
> >
> > On Mon, Jul 22, 2019 at 03:48:31PM +0300, Daniel Baluta wrote:
> > > This allows combining multiple-data-line FIFOs into a
> > > single-data-line FIFO.
> > >
> > > Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> > > ---
> > >  Documentation/devicetree/bindings/sound/fsl-sai.txt | 4 ++++
> >
> > This should be sent to devicetree mail-list also.
> >
> > >  1 file changed, 4 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/sound/fsl-sai.txt b/Documentation/devicetree/bindings/sound/fsl-sai.txt
> > > index 59f4d965a5fb..ca27afd840ba 100644
> > > --- a/Documentation/devicetree/bindings/sound/fsl-sai.txt
> > > +++ b/Documentation/devicetree/bindings/sound/fsl-sai.txt
> > > @@ -54,6 +54,10 @@ Optional properties:
> > >                         represents first data line, bit 1 represents second
> > >                         data line and so on. Data line is enabled if
> > >                         corresponding bit is set to 1.
> > > +  - fsl,fcomb_mode   : list of two integers (first for RX, second for TX)
> > > +                       representing FIFO combine mode. Possible values for
> > > +                       combined mode are: 0 - disabled, 1 - Rx/Tx from shift
> > > +                       registers, 2 - Rx/Tx by software, 3 - both.
> >
> > Looks like a software configuration to me, instead of a device
> > property. Is this configurable by user case, or hard-coded by
> > SoC/hardware design?
> 
> Indeed this is a software configuration and configurable by user case.
> Will think of a another way to specify it.

Yea, it needs to be put somewhere else other than devicetree.

Not sure sysfs is a good approach for ASoC components or can
be done via amixer control.