when release spi driver for arduino_duo



I am planing to integrate cc2520 to arduino_duo board, but zephyr does not
provide spi driver for this board in current zephyr-1.1.0.
Could anybody tell me when zephyr offers it, Or who is work at it?
So that I can take part in the job and help to integrate and test.

Best Regards
David Dai(戴卫彬)
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