linux-kernel - Re: [PATCH v5 1/7] ASoC: dt-bindings: fsl_asrc: Add new property fsl,asrc-format

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Message-ID: <20200320173213.GA9093@bogus>
Date:   Fri, 20 Mar 2020 11:32:13 -0600
From:   Rob Herring <robh@...nel.org>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     Shengjiu Wang <shengjiu.wang@....com>, timur@...nel.org,
        Xiubo.Lee@...il.com, festevam@...il.com, broonie@...nel.org,
        alsa-devel@...a-project.org, lgirdwood@...il.com, perex@...ex.cz,
        tiwai@...e.com, mark.rutland@....com, devicetree@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/7] ASoC: dt-bindings: fsl_asrc: Add new property
 fsl,asrc-format

On Mon, Mar 09, 2020 at 02:19:44PM -0700, Nicolin Chen wrote:
> On Mon, Mar 09, 2020 at 11:58:28AM +0800, Shengjiu Wang wrote:
> > In order to support new EASRC and simplify the code structure,
> > We decide to share the common structure between them. This bring
> > a problem that EASRC accept format directly from devicetree, but
> > ASRC accept width from devicetree.
> > 
> > In order to align with new ESARC, we add new property fsl,asrc-format.
> > The fsl,asrc-format can replace the fsl,asrc-width, then driver
> > can accept format from devicetree, don't need to convert it to
> > format through width.
> > 
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> > ---
> >  Documentation/devicetree/bindings/sound/fsl,asrc.txt | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/sound/fsl,asrc.txt b/Documentation/devicetree/bindings/sound/fsl,asrc.txt
> > index cb9a25165503..780455cf7f71 100644
> > --- a/Documentation/devicetree/bindings/sound/fsl,asrc.txt
> > +++ b/Documentation/devicetree/bindings/sound/fsl,asrc.txt
> > @@ -51,6 +51,11 @@ Optional properties:
> >  			  will be in use as default. Otherwise, the big endian
> >  			  mode will be in use for all the device registers.
> >  
> > +   - fsl,asrc-format	: Defines a mutual sample format used by DPCM Back
> > +			  Ends, which can replace the fsl,asrc-width.
> > +			  The value is SNDRV_PCM_FORMAT_S16_LE, or
> > +			  SNDRV_PCM_FORMAT_S24_LE
> 
> I am still holding the concern at the DT binding of this format,
> as it uses values from ASoC header file instead of a dt-binding
> header file -- not sure if we can do this. Let's wait for Rob's
> comments.

I assume those are an ABI as well, so it's okay to copy them unless we 
already have some format definitions for DT. But it does need to be copy 
in a header under include/dt-bindings/.

Rob