Amadeusz Sławiński amadeuszx.slawinski@linux.intel.com 于2022年8月12日周五 23:20写道：

On 8/11/2022 4:49 PM, Ban Tao wrote:

...

The Allwinner H6 and later SoCs have an DMIC block which is capable of capture.

Signed-off-by: Ban Tao fengzheng923@gmail.com

...

...

+#define SUN50I_DMIC_RATES (SNDRV_PCM_RATE_8000_48000)

Seeing supported rates in hw_params callback, you probably want to take a look at SNDRV_PCM_RATE_KNOT?

No, I don't need SNDRV_PCM_RATE_KNOT. Dmic does not support unknown rates.

...

+#define SUN50I_DMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |

SNDRV_PCM_FMTBIT_S24_LE)

...

+static struct snd_soc_dai_driver sun50i_dmic_dai = {

• .capture = {
  

•         .channels_min = 1,
  

•         .channels_max = 8,
  

•         .rates = SUN50I_DMIC_RATES,
  

•         .formats = SUN50I_DMIC_FORMATS,
  

•         .sig_bits = 21,
  

• },
  

• .probe = sun50i_dmic_soc_dai_probe,
  

• .ops = &sun50i_dmic_dai_ops,
  

• .name = "dmic",
  

+};

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