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

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Date:   Tue, 31 Mar 2020 10:28:25 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     Rob Herring <robh@...nel.org>, Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        linuxppc-dev@...ts.ozlabs.org,
        Shengjiu Wang <shengjiu.wang@....com>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/7] ASoC: dt-bindings: fsl_asrc: Add new property fsl,asrc-format

Hi

On Tue, Mar 24, 2020 at 5:22 AM Nicolin Chen <nicoleotsuka@...il.com> wrote:
>
> On Fri, Mar 20, 2020 at 11:32:13AM -0600, Rob Herring wrote:
> > 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
>
> They are defined under include/uapi. So I think we can use them?
>
> > already have some format definitions for DT. But it does need to be copy
> > in a header under include/dt-bindings/.
>
> Shengjiu is actually quoting those integral values, rather than
> those macros, so actually no need copy to include/dt-bindings,
> yet whoever adds this format property to a new DT would need to
> look up the value in a header file under include/uapi. I's just
> wondering if that's okay.
>
> Thanks
Shall I keep this change or drop this change?

best regards
wang shengjiu