spi device from handle

[Michael Remski]

kernel 2.6.33

relevant section of dts has:
spi@7000 {
        fpga0: fpga@0 {
                #address-cells = <1>;
                #size-cells = <0>;
                compatible = "fsl, espi-fpga";
                reg = <0>;
                linux,modalias = "spidev";
                spi-max-frequency = <1572864>;
        };
}

I have another device driver that needs to talk to this fpga device, but 
for the life of me I can't figure out the appropriate hooks to get there. 
The device can be talked to from userland via /dev/spixyx.k, but how do I 
get to the device from another driver?

Any little hints would be appreciated.  Upgrading kernel is not an option 
(sorry).

thanks

mike
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