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

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Date:   Mon, 9 Mar 2020 14:19:44 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     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,
        robh+dt@...nel.org, 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 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.