On Mon, Dec 09, 2019 at 07:35:11PM +0100, Daniel Mack wrote:

> +	/*
> +	 * Setting clock inversion is only supported globally for both DAIs,
> +	 * so we ignore the settings made for DAI1 here.
> +	 */
> +	if (index == 0) {
> +		switch (format & SND_SOC_DAIFMT_INV_MASK) {
> +		case SND_SOC_DAIFMT_NB_NF:

I dunno if it's a blocker but it'd feel nicer to try to verify that the
settings are the same and warn if not.

> +static int ad242x_set_dai_fmt_dai0(struct snd_soc_dai *codec_dai,
> +				   unsigned int format)
> +{
> +	return ad242x_set_dai_fmt(codec_dai, format, 0);
> +}
> +
> +static int ad242x_set_dai_fmt_dai1(struct snd_soc_dai *codec_dai,
> +				   unsigned int format)
> +{
> +	return ad242x_set_dai_fmt(codec_dai, format, 1);
> +}

You don't need separate ops, just look at dai->id.

> +module_platform_driver(ad242x_platform_driver);
> +
> +MODULE_AUTHOR("Daniel Mack <daniel@zonque.org>");
> +MODULE_DESCRIPTION("AD242X ALSA SoC driver");
> +MODULE_LICENSE("GPL");

Should have a MODULE_ALIAS() as well for autoloading.