Commit 17f84b79 authored by Hauke Mehrtens's avatar Hauke Mehrtens Committed by Mark Brown
Browse files

spi: lantiq-ssc: add support for Lantiq SSC SPI controller 



This driver supports the Lantiq SSC SPI controller in master
mode. This controller is found on Intel (former Lantiq) SoCs like
the Danube, Falcon, xRX200, xRX300.

The hardware uses two hardware FIFOs one for received and one for
transferred bytes. When the driver writes data into the transmit FIFO
the complete word is taken from the FIFO into a shift register. The
data from this shift register is then written to the wire. This driver
uses the interrupts signaling the status of the FIFOs and not the shift
register. It is also possible to use the interrupts for the shift
register, but they will send a signal after every word. When using the
interrupts for the shift register we get a signal when the last word is
written into the shift register and not when it is written to the wire.
After all FIFOs are empty the driver busy waits till the hardware is
not busy any more and returns the transfer status.

Signed-off-by: default avatarDaniel Schwierzeck <daniel.schwierzeck@gmail.com>
Signed-off-by: default avatarHauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent fafd6794

Documentation/devicetree/bindings/spi/spi-lantiq-ssc.txt

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Lantiq Synchronous Serial Controller (SSC) SPI master driver



Required properties:

- compatible: "lantiq,ase-spi", "lantiq,falcon-spi", "lantiq,xrx100-spi"

- #address-cells: see spi-bus.txt

- #size-cells: see spi-bus.txt

- reg: address and length of the spi master registers

- interrupts: should contain the "spi_rx", "spi_tx" and "spi_err" interrupt.





Optional properties:

- clocks: spi clock phandle

- num-cs: see spi-bus.txt, set to 8 if unset

- base-cs: the number of the first chip select, set to 1 if unset.



Example:





spi: spi@E100800 {

	compatible = "lantiq,xrx200-spi", "lantiq,xrx100-spi";

	reg = <0xE100800 0x100>;

	interrupt-parent = <&icu0>;

	interrupts = <22 23 24>;

	interrupt-names = "spi_rx", "spi_tx", "spi_err";

	#address-cells = <1>;

	#size-cells = <1>;

	num-cs = <6>;

	base-cs = <1>;

};

drivers/spi/Kconfig

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@@ -415,6 +415,14 @@ config SPI_NUC900 
	help

	  SPI driver for Nuvoton NUC900 series ARM SoCs



config SPI_LANTIQ_SSC

	tristate "Lantiq SSC SPI controller"

	depends on LANTIQ

	help

	  This driver supports the Lantiq SSC SPI controller in master

	  mode. This controller is found on Intel (former Lantiq) SoCs like

	  the Danube, Falcon, xRX200, xRX300.



config SPI_OC_TINY

	tristate "OpenCores tiny SPI"

	depends on GPIOLIB || COMPILE_TEST

drivers/spi/Makefile

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@@ -49,6 +49,7 @@ obj-$(CONFIG_SPI_FSL_SPI) += spi-fsl-spi.o 
obj-$(CONFIG_SPI_GPIO)			+= spi-gpio.o

obj-$(CONFIG_SPI_IMG_SPFI)		+= spi-img-spfi.o

obj-$(CONFIG_SPI_IMX)			+= spi-imx.o

obj-$(CONFIG_SPI_LANTIQ_SSC)		+= spi-lantiq-ssc.o

obj-$(CONFIG_SPI_JCORE)			+= spi-jcore.o

obj-$(CONFIG_SPI_LM70_LLP)		+= spi-lm70llp.o

obj-$(CONFIG_SPI_LP8841_RTC)		+= spi-lp8841-rtc.o

drivers/spi/spi-lantiq-ssc.c

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