[RFC] MPC8260 SPI driver

[Laurent Pinchart]

Hi everybody,

here's a preliminary version of the MPC8260 SPI driver I'm working on. The 
driver supports master mode only, and has been tested with an MMC device in 
SPI mode.

The driver doesn't support the following features:

- >1024 byte transfers. Those should be easy to support by splitting data 
buffers in <=1024 bytes chunks.
- transfer->delay_usecs
- MPC8260 SPI controller error reporting (BSY and TXE interrupts)
- probably other (hopefully minor) things.

Please test the code and report bugs (patches are welcome :-)).

Laurent Pinchart
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