FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/sound/fsl,audmix.txt

     NXP Audio Mixer (AUDMIX).
     
     The Audio Mixer is a on-chip functional module that allows mixing of two
     audio streams into a single audio stream. Audio Mixer has two input serial
     audio interfaces. These are driven by two Synchronous Audio interface
     modules (SAI). Each input serial interface carries 8 audio channels in its
     frame in TDM manner. Mixer mixes audio samples of corresponding channels
     from two interfaces into a single sample. Before mixing, audio samples of
     two inputs can be attenuated based on configuration. The output of the
    Audio Mixer is also a serial audio interface. Like input interfaces it has
    the same TDM frame format. This output is used to drive the serial DAC TDM
    interface of audio codec and also sent to the external pins along with the
    receive path of normal audio SAI module for readback by the CPU.
    
    The output of Audio Mixer can be selected from any of the three streams
     - serial audio input 1
     - serial audio input 2
     - mixed audio
    
    Mixing operation is independent of audio sample rate but the two audio
    input streams must have same audio sample rate with same number of channels
    in TDM frame to be eligible for mixing.
    
    Device driver required properties:
    =================================
      - compatible          : Compatible list, contains "fsl,imx8qm-audmix"
    
      - reg                 : Offset and length of the register set for the device.
    
      - clocks              : Must contain an entry for each entry in clock-names.
    
      - clock-names         : Must include the "ipg" for register access.
    
      - power-domains       : Must contain the phandle to AUDMIX power domain node
    
      - dais                : Must contain a list of phandles to AUDMIX connected
                              DAIs. The current implementation requires two phandles
                              to SAI interfaces to be provided, the first SAI in the
                              list being used to route the AUDMIX output.
    
    Device driver configuration example:
    ======================================
      audmix: audmix@59840000 {
        compatible = "fsl,imx8qm-audmix";
        reg = <0x0 0x59840000 0x0 0x10000>;
        clocks = <&clk IMX8QXP_AUD_AUDMIX_IPG>;
        clock-names = "ipg";
        power-domains = <&pd_audmix>;
        dais = <&sai4>, <&sai5>;
      };

Cache object: cd6f980e8086107f8e579107feb2b975