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Add SPI controller driver implemented in Socionext UniPhier SoCs.
UniPhier SoCs have two types SPI controllers; SCSSI supports a
single channel, and MCSSI supports multiple channels.
This driver supports SCSSI only.
This controller has 32bit TX/RX FIFO with depth of eight entry,
and supports the SPI master mode only.
This commit is implemented in PIO transfer mode, not DMA transfer.
Signed-off-by: Kunihiko Hayashi <[email protected]>
Signed-off-by: Keiji Hayashibara <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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