spi: Add SPI driver for Mikrotik RB4xx series boards

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This driver mediates access between the connected CPLD and other devices
on the bus.

The m25p80-compatible boot flash and (some models) MMC use regular SPI,
bitbanged as required by the SoC. However the SPI-connected CPLD has
a two-wire mode, in which two bits are transferred per SPI clock
cycle. The second bit is transmitted with the SoC's CS2 pin.

Signed-off-by: Bert Vermeulen <bert@biot.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

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Bert Vermeulen 2015-04-15 17:43:52 +02:00 • committed by Mark Brown

parent c517d838eb

commit 05aec35787

3 changed files with 217 additions and 0 deletions

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6

drivers/spi/Kconfig

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1

drivers/spi/Makefile

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210

drivers/spi/spi-rb4xx.c

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