FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/fpga/lattice-ice40-fpga-mgr.txt

     Lattice iCE40 FPGA Manager
     
     Required properties:
     - compatible:           Should contain "lattice,ice40-fpga-mgr"
     - reg:                  SPI chip select
     - spi-max-frequency:    Maximum SPI frequency (>=1000000, <=25000000)
     - cdone-gpios:          GPIO input connected to CDONE pin
     - reset-gpios:          Active-low GPIO output connected to CRESET_B pin. Note
                             that unless the GPIO is held low during startup, the
                            FPGA will enter Master SPI mode and drive SCK with a
                            clock signal potentially jamming other devices on the
                            bus until the firmware is loaded.
    
    Example:
            fpga: fpga@0 {
                    compatible = "lattice,ice40-fpga-mgr";
                    reg = <0>;
                    spi-max-frequency = <1000000>;
                    cdone-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
                    reset-gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
            };

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