I2SE Device Tree Bindings
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Duckbill Board
Required root node properties:
    - compatible = "i2se,duckbill", "fsl,imx28";

Duckbill 2 Board
Required root node properties:
    - compatible = "i2se,duckbill-2", "fsl,imx28";

Duckbill 2 485 Board
Required root node properties:
    - compatible = "i2se,duckbill-2-485", "i2se,duckbill-2", "fsl,imx28";

Duckbill 2 EnOcean Board
Required root node properties:
    - compatible = "i2se,duckbill-2-enocean", "i2se,duckbill-2", "fsl,imx28";

Duckbill 2 SPI Board
Required root node properties:
    - compatible = "i2se,duckbill-2-spi", "i2se,duckbill-2", "fsl,imx28";