...

• regmap_write(es8326->regmap, ES8326_SDINOUT1_IO,

•     (ES8326_IO_DMIC_CLK << ES8326_SDINOUT1_SHIFT));
  

• regmap_write(es8326->regmap, ES8326_SDINOUT1_IO, ES8326_IO_INPUT);

Why - will this impact existing users?

No, it will not impact existing users, Because I have set this register value to work in es8326_set_bias_level.