On Tue, Jun 15, 2021 at 09:03:26PM +0800, Ban Tao wrote:

Other than a few small things this looks good:

> +M:	Ban Tao <fengzheng923@gmail.com>
> +L:	alsa-devel@alsa-project.org (moderated for non-subscribers)
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/sound/allwinner,sun50i-h6-dmic.yaml
> +F:	sound/soc/sunxi/sun50i-dmic.c

Not the binding document?

> @@ -0,0 +1,408 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * ALSA SoC DMIC Audio Layer
> + *
> + * Copyright 2021 Ban Tao <fengzheng923@gmail.com>
> + *

Please make the entire comment a C++ one so things look more
intentional.

> +static void sun50i_snd_rxctrl_enable(struct snd_pcm_substream *substream,
> +				    struct sun50i_dmic_dev *host, bool enable)
> +{
> +	if (enable) {

> +	} else {

> +static int sun50i_dmic_trigger(struct snd_pcm_substream *substream, int cmd,
> +			       struct snd_soc_dai *dai)
> +{
> +	int ret = 0;
> +	struct sun50i_dmic_dev *host = snd_soc_dai_get_drvdata(dai);
> +
> +	if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
> +		return -EINVAL;
> +
> +	switch (cmd) {
> +	case SNDRV_PCM_TRIGGER_START:
> +	case SNDRV_PCM_TRIGGER_RESUME:
> +	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
> +		sun50i_snd_rxctrl_enable(substream, host, true);
> +		break;
> +
> +	case SNDRV_PCM_TRIGGER_STOP:
> +	case SNDRV_PCM_TRIGGER_SUSPEND:
> +	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> +		sun50i_snd_rxctrl_enable(substream, host, false);
> +		break;

This is the only caller of _rxctrl_enable() and _rxctrl_enable() shares
no code between the two cases - just inline _rxctrl_enable() here, it's
clearer what's going on.

> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	base = devm_ioremap_resource(&pdev->dev, res);

devm_platform_ioremap_resource()