On Fri, Nov 06, 2020 at 02:18:37PM +0800, Shane Chien wrote:

> +static int mt_vaud18_event(struct snd_soc_dapm_widget *w,
> +			   struct snd_kcontrol *kcontrol,
> +			   int event)
> +{
> +	struct snd_soc_component *cmpnt = snd_soc_dapm_to_component(w->dapm);
> +	struct mt6359_priv *priv = snd_soc_component_get_drvdata(cmpnt);
> +	int ret = 0;
> +
> +	switch (event) {
> +	case SND_SOC_DAPM_PRE_PMU:
> +		ret = regulator_enable(priv->avdd_reg);
> +		if (ret)
> +			dev_err(priv->dev, "regulator_enable err: %d\n", ret);
> +		break;
> +	case SND_SOC_DAPM_POST_PMD:
> +		ret = regulator_disable(priv->avdd_reg);
> +		if (ret)
> +			dev_err(priv->dev, "regulator_disable err: %d\n", ret);
> +		break;

This is just a SND_SOC_DAPM_REGULATOR_SUPPLY widget as far as I can see
- why not use one of those rather than open coding?