Add Open Alliance spi protocol support.
Open Alliance is a chunk-based SPI protocol, based on sending
over SPI an ethernet frame divided in smaller chunks, using a
specific 32-bit header for each chunk transferred. All chunks
can be sent or received by a single dma transfer.
Default mode is set to Open Alliance SPI without protection,
since the adin2111 dev. board comes shipped this way.
Tested:
- Open Alliance SPI, no protection (default board shipped)
- Open Alliance SPI, protection
- Generic SPI, no crc
- Generic SPI, with crc8
Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
0ca8b0756b