mtd/atmel_nand: add on_flash_bbt to enable the use of On Flash BBT

This will allow to enable it from the board.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index fb87b03..045d174 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -562,7 +562,7 @@
 		}
 	}
 
-	if (on_flash_bbt) {
+	if (host->board->on_flash_bbt || on_flash_bbt) {
 		printk(KERN_INFO "atmel_nand: Use On Flash BBT\n");
 		nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
 	}
diff --git a/include/linux/platform_data/atmel.h b/include/linux/platform_data/atmel.h
index 7b8a445..d056263 100644
--- a/include/linux/platform_data/atmel.h
+++ b/include/linux/platform_data/atmel.h
@@ -19,6 +19,7 @@
 	u8		cle;			/* address line number connected to CLE */
 	u8		bus_width_16;		/* buswidth is 16 bit */
 	u8		ecc_mode;		/* ecc mode */
+	u8		on_flash_bbt;		/* bbt on flash */
 	struct mtd_partition *parts;
 	unsigned int	num_parts;
 };