ARM: NUC900: Add spi driver support for nuc900

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 06e1c0c..b9908e9 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -275,6 +275,13 @@
 	  This is the platform driver for the SPI controller IP
 	  from the Xilinx EDK.
 
+config SPI_NUC900
+	tristate "Nuvoton NUC900 series SPI"
+	depends on ARCH_W90X900 && EXPERIMENTAL
+	select SPI_BITBANG
+	help
+	  SPI driver for Nuvoton NUC900 series ARM SoCs
+
 #
 # Add new SPI master controllers in alphabetical order above this line
 #