无波形且电压异常（0.4MV）的问题

longwj

针对SAI接口中MCLK无波形且电压异常（0.4MV）的问题，分析如下： 一、设备树配置检查与修正 确认时钟源与频率设置 确保设备树中为SAI节点正确配置MCLK时钟源（如&cru I2S0_8CH_MCLKOUT），并设置assigned-clock-rates为匹配硬件的频率（通常为12.288MHz或其他编解码器要求的值）1。 若设备树中pinctrl部分被注释，需取消注释并正确配置引脚复用功能，例如启用i2s0_mclk引脚控制1。 验证时钟使能状态 通过命令cat /sys/ke

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