* extend spi_device struct element 'mode' to u16 (currently u8, fully  
utilized as of 2.6.3x)
* chip_select to s16 (until now also u8)

Background:
Chip select size change: allow specification of SPI-device  
hardware-related spi control per device-specific (native) or gpio-based  
control.
mode size change: obligatory... A mode bit could also be assigned a  
selection bit: chip_select interpreted as native SSEL-index or as  
gpio-index (instead of negative value for chip_select).

Chip select differentiation bottom line: Naming of the device. I'm not  
sure how to establish this. spidev0.x are normally assigned for chip  
selects driven by the SPI peripheral hardware. GPIO-based: spidev0.gpioxx?

-Rob

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