spi: Add SPI driver for Mikrotik RB4xx series boards
PATCH v5 1/1 spi: Add SPI driver for Mikrotik RB4xx series boards
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 "fast write" mode, in which two bits are transferred by SPI clock cycle. The second bit is transmitted with the SoC's CS2 pin.
Protocol drivers using this fast write facility signal this by setting the cs_change flag on transfers.
Signed-off-by Bert Vermeulen <[email protected]>
--- drivers/spi/Kconfig | 6 ++ drivers/spi/Makefile | 1 + drivers/spi/spi-rb4xx.c | 244 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 251 insertions(+) create mode 100644 drivers/spi/spi-rb4xx.c
drivers/spi/Kconfig +6 -0
@@ -429,6 +429,12 @@ config SPI_ROCKCHIP The main usecase of this controller is to use spi flash as boot device. +config SPI_RB4XX + tristate "Mikrotik RB4XX SPI master" + depends on SPI_MASTER && ATH79 + help + SPI controller driver for the Mikrotik RB4xx series boards. + config SPI_RSPI tristate "Renesas RSPI/QSPI controller" depends on SUPERH || ARCH_SHMOBILE || COMPILE_TEST
drivers/spi/Makefile +1 -0
@@ -66,6 +66,7 @@ obj-$(CONFIG_SPI_PXA2XX) += spi-pxa2xx-platform.o obj-$(CONFIG_SPI_PXA2XX_PCI) += spi-pxa2xx-pci.o obj-$(CONFIG_SPI_QUP) += spi-qup.o obj-$(CONFIG_SPI_ROCKCHIP) += spi-rockchip.o +obj-$(CONFIG_SPI_RB4XX) += spi-rb4xx.o obj-$(CONFIG_SPI_RSPI) += spi-rspi.o obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o spi-s3c24xx-hw-y := spi-s3c24xx.o
drivers/spi/spi-rb4xx.c new file +244 -0
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Signature · 1 line
1.9.1