Blackfin: move default boot SPI CS to common code

Move the default SPI CS that we boot from into common code so that it can
be used in other SPI drivers and environment settings.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

board/bf537-stamp/spi_flash.c

@@ -180,13 +180,7 @@ static struct manufacturer_info flash_manufacturers[] = {
  *	BF51x, BF533, BF561: SSEL2
  */
 #ifndef CONFIG_SPI_FLASH_SSEL
-# if defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \
-     defined(__ADSPBF538__) || defined(__ADSPBF539__) || defined(__ADSPBF561__) || \
-     defined(__ADSPBF51x__)
-#  define CONFIG_SPI_FLASH_SSEL 2
-# else
-#  define CONFIG_SPI_FLASH_SSEL 1
-# endif
+# define CONFIG_SPI_FLASH_SSEL BFIN_BOOT_SPI_SSEL
 #endif
 #define SSEL_MASK (1 << CONFIG_SPI_FLASH_SSEL)
 

include/asm-blackfin/blackfin-config-pre.h

@@ -60,4 +60,13 @@ static inline const char *get_bfin_boot_mode(int bfin_boot)
 }
 #endif
 
+/* Define the default SPI CS used when booting out of SPI */
+#if defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \
+    defined(__ADSPBF538__) || defined(__ADSPBF539__) || defined(__ADSPBF561__) || \
+    defined(__ADSPBF51x__)
+# define BFIN_BOOT_SPI_SSEL 2
+#else
+# define BFIN_BOOT_SPI_SSEL 1
+#endif
+
 #endif