在终端中打印出如下信息，请问avdd，dvdd，iovdd是必须的吗，在驱动源码中看ASoC: Failed to set DAI format: -22错误是因为设置主模式时检测到没有时钟，这是什么原因呢
[ 2.340523] pcm186x 0-004a: 0-004a supply avdd not found, using dummy regulator
[ 2.348989] pcm186x 0-004a: 0-004a supply dvdd not found, using dummy regulator
[ 2.357289] pcm186x 0-004a: 0-004a supply iovdd not found, using dummy regulator
[ 2.365938] pcm186x_probe sucess
[ 2.366076] sunxi-i2c sunxi-i2c0: probe success
[ 2.405786] sun8iw20-pinctrl pio: pio supply vcc-pd not found, using dummy regulator
[ 2.449462] debugfs: Directory '2034000.daudio' with parent 'pcm1864' already present!
[ 2.458428] pcm186x 0-004a: operating in master mode requires sysclock to be configured
[ 2.467401] pcm186x 0-004a: ASoC: Failed to set DAI format: -22
附上我的设备树配置
