linux-kernel - Re: [RFC PATCH] sound: airoha: add support for AN7581 PCM driver

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Message-ID: <4a3266af045b81ab4ae7826db890d5f7333227f4.camel@pengutronix.de>
Date: Thu, 09 Oct 2025 10:33:17 +0200
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Christian Marangi <ansuelsmth@...il.com>, Jaroslav Kysela
 <perex@...ex.cz>,  Takashi Iwai <tiwai@...e.com>,
 linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org,
 upstream@...oha.com
Subject: Re: [RFC PATCH] sound: airoha: add support for AN7581 PCM driver

Hi Christian,

On Fr, 2025-10-03 at 03:54 +0200, Christian Marangi wrote:
> The Airoha AN7581 SoC have alternative Sound Card that expose PCM OPs
> dedicated for VoIP application.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
>  sound/Kconfig             |   2 +
>  sound/Makefile            |   2 +-
>  sound/airoha/Kconfig      |   9 +
>  sound/airoha/Makefile     |   3 +
>  sound/airoha/an7581-pcm.c | 637 ++++++++++++++++++++++++++++++++++++++
>  5 files changed, 652 insertions(+), 1 deletion(-)
>  create mode 100644 sound/airoha/Kconfig
>  create mode 100644 sound/airoha/Makefile
>  create mode 100644 sound/airoha/an7581-pcm.c
> 
[...]
> diff --git a/sound/airoha/an7581-pcm.c b/sound/airoha/an7581-pcm.c
> new file mode 100644
> index 000000000000..bf1fc447aed4
> --- /dev/null
> +++ b/sound/airoha/an7581-pcm.c
> @@ -0,0 +1,637 @@
[...]
> +static int an7581_pcm_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct an7581_pcm_priv *priv;
> +	struct snd_card *card;
> +	struct snd_pcm *pcm;
> +	int irq;
> +	int ret;
> +
> +	ret = snd_devm_card_new(dev, 1, "AN7581 PCM SOUND",
> +				THIS_MODULE, 0, &card);
> +	if (ret)
> +		return ret;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->map = device_node_to_regmap(dev->of_node);
> +	if (!IS_ERR(priv->map))
> +		return PTR_ERR(priv->map);
> +
> +	priv->reset = devm_reset_control_get_exclusive(dev, "pcm1");

Is there more than one reset input per PCM module?
Lookup by name is only needed if there are multiple resets.

This question should be answered by a device tree binding document for
airoha,an7581-pcm.

regards
Philipp