mtd: nand: Export symbol nand_decode_ext_id

In preparation of moving specific nand support that are not jedec
or onfi

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 145de22..174c760 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4160,7 +4160,7 @@
  * chip. The rest of the parameters must be decoded according to generic or
  * manufacturer-specific "extended ID" decoding patterns.
  */
-static void nand_decode_ext_id(struct nand_chip *chip)
+void nand_decode_ext_id(struct nand_chip *chip)
 {
 	struct mtd_info *mtd = &chip->mtd;
 	int extid, id_len;
@@ -4286,6 +4286,7 @@
 
 	}
 }
+EXPORT_SYMBOL_GPL(nand_decode_ext_id);
 
 /*
  * Manufacturer detection. Only used when the NAND is not ONFI or JEDEC
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index d8141cb..8fb2a43 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1374,4 +1374,7 @@
 int nand_write_data_op(struct nand_chip *chip, const void *buf,
 		       unsigned int len, bool force_8bit);
 
+/* Default extended ID decoding function */
+void nand_decode_ext_id(struct nand_chip *chip);
+
 #endif /* __LINUX_MTD_RAWNAND_H */