linux-kernel - Re: [PATCH 04/11] ASoC: sun4i-spdif: Support SPDIF output on A523 family

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Message-ID: <13867454.uLZWGnKmhe@jernej-laptop>
Date: Mon, 20 Oct 2025 19:49:34 +0200
From: Jernej Škrabec <jernej.skrabec@...il.com>
To: Chen-Yu Tsai <wens@...nel.org>, Jernej Skrabec <jernej@...nel.org>,
 Samuel Holland <samuel@...lland.org>, Mark Brown <broonie@...nel.org>,
 Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Vinod Koul <vkoul@...nel.org>, Chen-Yu Tsai <wens@...nel.org>
Cc: linux-sunxi@...ts.linux.dev, linux-sound@...r.kernel.org,
 linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 devicetree@...r.kernel.org, dmaengine@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject:
 Re: [PATCH 04/11] ASoC: sun4i-spdif: Support SPDIF output on A523 family

Hi,

Dne ponedeljek, 20. oktober 2025 ob 19:10:50 Srednjeevropski poletni čas je Chen-Yu Tsai napisal(a):
> The TX side of the SPDIF block on the A523 is almost the same the
> previous generations, the only difference being that it has separate
> module clock inputs for the TX and RX side.
> 
> Since this driver currently only supports TX, add support for a
> different clock name so that TX and RX clocks can be separated
> if RX support is ever added. Then add support for the A523.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...nel.org>
> ---
>  sound/soc/sunxi/sun4i-spdif.c | 28 +++++++++++++++++++++++++---
>  1 file changed, 25 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/soc/sunxi/sun4i-spdif.c b/sound/soc/sunxi/sun4i-spdif.c
> index 34e5bd94e9af..6a58dc4311de 100644
> --- a/sound/soc/sunxi/sun4i-spdif.c
> +++ b/sound/soc/sunxi/sun4i-spdif.c
> @@ -177,6 +177,7 @@ struct sun4i_spdif_quirks {
>  	bool has_reset;
>  	unsigned int val_fctl_ftx;
>  	unsigned int mclk_multiplier;
> +	const char *tx_clk_name;
>  };
>  
>  struct sun4i_spdif_dev {
> @@ -323,6 +324,7 @@ static int sun4i_spdif_hw_params(struct snd_pcm_substream *substream,
>  	}
>  	mclk *= host->quirks->mclk_multiplier;
>  
> +	dev_info(&pdev->dev, "Setting SPDIF clock rate to %u\n", mclk);
>  	ret = clk_set_rate(host->spdif_clk, mclk);
>  	if (ret < 0) {
>  		dev_err(&pdev->dev,
> @@ -542,7 +544,6 @@ static struct snd_soc_dai_driver sun4i_spdif_dai = {
>  		.formats = SUN4I_FORMATS,
>  	},
>  	.ops = &sun4i_spdif_dai_ops,
> -	.name = "spdif",

Why this change?

>  };
>  
>  static const struct sun4i_spdif_quirks sun4i_a10_spdif_quirks = {
> @@ -572,6 +573,14 @@ static const struct sun4i_spdif_quirks sun50i_h6_spdif_quirks = {
>  	.mclk_multiplier = 1,
>  };
>  
> +static const struct sun4i_spdif_quirks sun55i_a523_spdif_quirks = {
> +	.reg_dac_txdata = SUN8I_SPDIF_TXFIFO,
> +	.val_fctl_ftx   = SUN50I_H6_SPDIF_FCTL_FTX,
> +	.has_reset      = true,
> +	.mclk_multiplier = 1,
> +	.tx_clk_name	= "tx",
> +};
> +
>  static const struct of_device_id sun4i_spdif_of_match[] = {
>  	{
>  		.compatible = "allwinner,sun4i-a10-spdif",
> @@ -594,6 +603,15 @@ static const struct of_device_id sun4i_spdif_of_match[] = {
>  		/* Essentially the same as the H6, but without RX */
>  		.data = &sun50i_h6_spdif_quirks,
>  	},
> +	{
> +		.compatible = "allwinner,sun55i-a523-spdif",
> +		/*
> +		 * Almost the same as H6, but has split the TX and RX clocks,
> +		 * has a separate reset bit for the RX side, and has some
> +		 * expanded features for the RX side.
> +		 */
> +		.data = &sun55i_a523_spdif_quirks,
> +	},
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, sun4i_spdif_of_match);
> @@ -635,6 +653,7 @@ static int sun4i_spdif_probe(struct platform_device *pdev)
>  	const struct sun4i_spdif_quirks *quirks;
>  	int ret;
>  	void __iomem *base;
> +	const char *tx_clk_name = "spdif";

Reverse tree?

Otherwise it looks good.

Best regards,
Jernej

>  
>  	dev_dbg(&pdev->dev, "Entered %s\n", __func__);
>  
> @@ -671,9 +690,12 @@ static int sun4i_spdif_probe(struct platform_device *pdev)
>  		return PTR_ERR(host->apb_clk);
>  	}
>  
> -	host->spdif_clk = devm_clk_get(&pdev->dev, "spdif");
> +	if (quirks->tx_clk_name)
> +		tx_clk_name = quirks->tx_clk_name;
> +	host->spdif_clk = devm_clk_get(&pdev->dev, tx_clk_name);
>  	if (IS_ERR(host->spdif_clk)) {
> -		dev_err(&pdev->dev, "failed to get a spdif clock.\n");
> +		dev_err(&pdev->dev, "failed to get the \"%s\" clock.\n",
> +			tx_clk_name);
>  		return PTR_ERR(host->spdif_clk);
>  	}
>  
>