>spi_register_board_info() will add the board information structure to 
>board_list in drivers/spi/spi.c. The list is walked from
scan_boardinfo() in 
>the same file when a SPI master is registered by spi_register_master().
The 
>first step would be to check if spi_register_master() is called, and if
it 
>fails before calling scan_boardinfo(). Add a few printk's there.

>If a master is correctly registered, scan_boardinfo() will call 
>spi_new_device(), which in turn calls device_register(). That's where
the 
>spi_match_device() function should be called, using the function
pointer 
>stored in proxy->dev.bus.match.

Thank you for your help, is it possible that calling
spi_register_master() before the spi_register_board_info() and before
the registration for m25p80 spi device causes the problem? 

Thank you.

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