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>

drivers/mtd/nand/atmel_nand.c

@@ -562,7 +562,7 @@ static int __init atmel_nand_probe(struct platform_device *pdev)
 		}
 	}
 
-	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;
 	}

include/linux/platform_data/atmel.h

@@ -19,6 +19,7 @@ struct atmel_nand_data {
 	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;
 };