spi: update Makefile and Kconfig to include bbb spi driver

Updated SPI Makefile and Kconfig in order to contain the option
to compile am335x beaglebone black omap4 spi real-time driver.
Signed-off-by: Laurentiu-Cristian Duca <laurentiu.duca@gmail.com>
[Jan: enabled in CI build]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

.travis.yml

@@ -143,6 +143,7 @@ before_script:
   - ./scripts/config -e XENO_DRIVERS_GPIOPWM
   - ./scripts/config -e XENO_DRIVERS_SPI_BCM2835
   - ./scripts/config -e XENO_DRIVERS_SPI_SUN6I
+  - ./scripts/config -e XENO_DRIVERS_SPI_OMAP2_MCSPI_RT
   - ./scripts/config -e XENO_DRIVERS_SPI_DEBUG
 
   - popd

kernel/drivers/spi/Kconfig

@@ -22,6 +22,16 @@ config XENO_DRIVERS_SPI_SUN6I
 	Enables support for the SPI controller available from
 	Allwinner's A31, H3 SoCs.
 
+config XENO_DRIVERS_SPI_OMAP2_MCSPI_RT
+	tristate "McSPI rt-driver for OMAP"
+	depends on HAS_DMA
+	depends on ARCH_OMAP2PLUS || COMPILE_TEST
+	select XENO_DRIVERS_SPI
+	help
+
+	SPI real-time master controller for OMAP24XX and later Multichannel SPI
+	(McSPI) modules.
+
 config XENO_DRIVERS_SPI_DEBUG
        depends on XENO_DRIVERS_SPI
        bool "Enable SPI core debugging features"

kernel/drivers/spi/Makefile

@@ -7,6 +7,8 @@ xeno_spi-y := spi-master.o spi-device.o
 
 obj-$(CONFIG_XENO_DRIVERS_SPI_BCM2835) += xeno_spi_bcm2835.o
 obj-$(CONFIG_XENO_DRIVERS_SPI_SUN6I) += xeno_spi_sun6i.o
+obj-$(CONFIG_XENO_DRIVERS_SPI_OMAP2_MCSPI_RT) += xeno_spi_omap2_mcspi_rt.o
 
 xeno_spi_bcm2835-y := spi-bcm2835.o
 xeno_spi_sun6i-y := spi-sun6i.o
+xeno_spi_omap2_mcspi_rt-y := spi-omap2-mcspi-rt.o