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

     Freescale Sony/Philips Digital Interface Format (S/PDIF) Controller
     
     The Freescale S/PDIF audio block is a stereo transceiver that allows the
     processor to receive and transmit digital audio via an coaxial cable or
     a fibre cable.
     
     Required properties:
     
       - compatible          : Compatible list, should contain one of the following
                              compatibles:
                              "fsl,imx35-spdif",
                              "fsl,vf610-spdif",
                              "fsl,imx6sx-spdif",
    
      - reg                 : Offset and length of the register set for the device.
    
      - interrupts          : Contains the spdif interrupt.
    
      - dmas                : Generic dma devicetree binding as described in
                              Documentation/devicetree/bindings/dma/dma.txt.
    
      - dma-names           : Two dmas have to be defined, "tx" and "rx".
    
      - clocks              : Contains an entry for each entry in clock-names.
    
      - clock-names         : Includes the following entries:
            "core"            The core clock of spdif controller.
            "rxtx<0-7>"       Clock source list for tx and rx clock.
                              This clock list should be identical to the source
                              list connecting to the spdif clock mux in "SPDIF
                              Transceiver Clock Diagram" of SoC reference manual.
                              It can also be referred to TxClk_Source bit of
                              register SPDIF_STC.
            "spba"            The spba clock is required when SPDIF is placed as a
                              bus slave of the Shared Peripheral Bus and when two
                              or more bus masters (CPU, DMA or DSP) try to access
                              it. This property is optional depending on the SoC
                              design.
    
    Optional properties:
    
       - big-endian         : If this property is absent, the native endian mode
                              will be in use as default, or the big endian mode
                              will be in use for all the device registers.
    
    Example:
    
    spdif: spdif@2004000 {
            compatible = "fsl,imx35-spdif";
            reg = <0x02004000 0x4000>;
            interrupts = <0 52 0x04>;
            dmas = <&sdma 14 18 0>,
                   <&sdma 15 18 0>;
            dma-names = "rx", "tx";
    
            clocks = <&clks 197>, <&clks 3>,
                   <&clks 197>, <&clks 107>,
                   <&clks 0>, <&clks 118>,
                   <&clks 62>, <&clks 139>,
                   <&clks 0>;
            clock-names = "core", "rxtx0",
                    "rxtx1", "rxtx2",
                    "rxtx3", "rxtx4",
                    "rxtx5", "rxtx6",
                    "rxtx7";
    
            big-endian;
    };

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