Add framework for a SAM3U SPI driver

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4010 42af7a65-404d-4744-a932-0658087f49c3

configs/sam3u-ek/README.txt

@@ -263,8 +263,9 @@ SAM3U-EK-specific Configuration Options
   Individual subsystems can be enabled:
 
 	CONFIG_SAM3U_DMA
-	CONFIG_SAM3U_NAND
 	CONFIG_SAM3U_HSMCI
+	CONFIG_SAM3U_NAND
+	CONFIG_SAM3U_SPI
 	CONFIG_SAM3U_UART
 	CONFIG_SAM3U_USART0
 	CONFIG_SAM3U_USART1

configs/sam3u-ek/touchscreen/defconfig

@@ -2,7 +2,7 @@
 # configs/sam3u-ek/touchscreen/defconfig
 #
 #   Copyright (C) 2011 Gregory Nutt. All rights reserved.
-#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -101,8 +101,9 @@ CONFIG_SAM3U_BUILDROOT=y
 #  Individual subsystems can be enabled:
 #
 CONFIG_SAM3U_DMA=n
-CONFIG_SAM3U_NAND=n
 CONFIG_SAM3U_HSMCI=n
+CONFIG_SAM3U_NAND=n
+CONFIG_SAM3U_SPI=y
 CONFIG_SAM3U_UART=y
 CONFIG_SAM3U_USART0=n
 CONFIG_SAM3U_USART1=n