Merge pull request #191 in SW_PON/linux from...

Merge pull request #191 in SW_PON/linux from feature/DRVLIB_SW-529-port-legacy-spi-driver-for to xrx500

* commit '4181ef7e4ead6cba7e44e6ba69af0df457f2f3be':
  DRVLIB_SW-529 - remove extra spaces
  DRVLIB_SW-529 - [REMOVE] legacy sflash driver for linux 4.5 onward
  DRVLIB_SW-529 - legacy sflash driver for linux 4.5 onward
  DRVLIB_SW-529 - xrx500 legacy ssc driver for linux 4.9 support
  DRVLIB_SW-529 - fix Kconfig language error
  DRVLIB_SW-529 - Legacy SPI Driver for XRX500

drivers/spi/Kconfig

@@ -583,6 +583,30 @@ config SPI_SC18IS602
 	help
 	  SPI driver for NXP SC18IS602/602B/603 I2C to SPI bridge.
 
+config LANTIQ_SPI
+	tristate "Lantiq SPI/SSC driver"
+	depends on SPI_MASTER
+	default n
+
+config LANTIQ_SPI_DEBUG
+    bool "Lantiq SPI/SSC runtime debug support"
+    depends on LANTIQ_SPI
+    default n
+    help
+    Choose this option to enable Lantiq SPI/SSC runtime debug options.
+    This can be enabled by writing debug options into
+    /proc/sys/dev/ltq_ssc/debug.
+
+config LANTIQ_SPI_ASYNCHRONOUS
+	bool "Lantiq SPI/SSC tasklet support"
+	depends on LANTIQ_SPI
+	default y
+	---help---
+	Choose this option to support synchronous and asynchronous APIs
+	at the same time. SPI itself will run in tasklet. If not,
+	only synchronous API is supported. SPI context will in kernel
+	thread mode and belong to caller's context.
+
 config SPI_SH_MSIOF
 	tristate "SuperH MSIOF SPI controller"
 	depends on HAVE_CLK && HAS_DMA

drivers/spi/Makefile

@@ -104,4 +104,5 @@ obj-$(CONFIG_SPI_XLP)			+= spi-xlp.o
 obj-$(CONFIG_SPI_XTENSA_XTFPGA)		+= spi-xtensa-xtfpga.o
 obj-$(CONFIG_SPI_ZYNQMP_GQSPI)		+= spi-zynqmp-gqspi.o
 obj-$(CONFIG_SPI_CADENCE_QSPI)		+= spi-cadence-qspi.o
-obj-$(CONFIG_SPI_CADENCE_QSPI)		+= spi-cadence-qspi-apb.o
\ No newline at end of file
+obj-$(CONFIG_SPI_CADENCE_QSPI)		+= spi-cadence-qspi-apb.o
+obj-$(CONFIG_LANTIQ_SPI)		+= ltq_ssc.o