linux-kernel - Re: [PATCH 3/4] ASoC: fsl-asoc-card: Add optional dt property for setting mclk-id

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Date:   Mon, 13 Dec 2021 14:37:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ariel D'Alessandro <ariel.dalessandro@...labora.com>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Xiubo.Lee@...il.com,
        bcousson@...libre.com, broonie@...nel.org, festevam@...il.com,
        kuninori.morimoto.gx@...esas.com, lgirdwood@...il.com,
        michael@...rulasolutions.com, nicoleotsuka@...il.com,
        perex@...ex.cz, shengjiu.wang@...il.com, tiwai@...e.com,
        tony@...mide.com
Subject: Re: [PATCH 3/4] ASoC: fsl-asoc-card: Add optional dt property for
 setting mclk-id

On Fri, Dec 03, 2021 at 10:49:29AM -0300, Ariel D'Alessandro wrote:
> Sound cards may allow using different main clock inputs. In the generic
> fsl-asoc-card driver, these values are hardcoded for each specific card
> configuration.
> 
> Let's make it more flexible, allowing setting mclk-id from the
> device-tree node. Otherwise, the default value for each card
> configuration is used.
> 
> Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@...labora.com>
> ---
>  Documentation/devicetree/bindings/sound/fsl-asoc-card.txt | 1 +
>  sound/soc/fsl/fsl-asoc-card.c                             | 6 ++++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt b/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt
> index 23d83fa7609f..b219626a5403 100644
> --- a/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt
> +++ b/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt
> @@ -82,6 +82,7 @@ Optional properties:
>    - dai-format		: audio format, for details see simple-card.yaml.
>    - frame-inversion	: dai-link uses frame clock inversion, for details see simple-card.yaml.
>    - bitclock-inversion	: dai-link uses bit clock inversion, for details see simple-card.yaml.
> +  - mclk-id		: main clock id, specific for each card configuration.

Ahh, there it is. This change and the header defines should be 1 patch 
and driver changes another.

>  
>  Optional unless SSI is selected as a CPU DAI:
>  
> diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c
> index 90cbed496f98..bb962e04d40b 100644
> --- a/sound/soc/fsl/fsl-asoc-card.c
> +++ b/sound/soc/fsl/fsl-asoc-card.c
> @@ -693,6 +693,12 @@ static int fsl_asoc_card_probe(struct platform_device *pdev)
>  		goto asrc_fail;
>  	}
>  
> +	/*
> +	 * Allow setting mclk-id from the device-tree node. Otherwise, the
> +	 * default value for each card configuration is used.
> +	 */
> +	of_property_read_u32(np, "mclk-id", &priv->codec_priv.mclk_id);
> +
>  	/* Format info from DT is optional. */
>  	snd_soc_daifmt_parse_clock_provider_as_phandle(np, NULL, &bitclkprovider, &frameprovider);
>  	if (bitclkprovider || frameprovider) {
> -- 
> 2.30.2
> 
>