diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index 5465562..dea42f4 100644
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -101,6 +101,7 @@
 				size_t count);
 	unsigned short (*read_word) (void __iomem *addr);
 	void (*write_word) (unsigned short value, void __iomem *addr);
+	int (*chip_probe)(struct mtd_info *mtd);
 	void (*mmcontrol) (struct mtd_info *mtd, int sync_read);
 	int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
 	int (*scan_bbt)(struct mtd_info *mtd);
diff --git a/include/linux/mtd/samsung_onenand.h b/include/linux/mtd/samsung_onenand.h
index 021fa27..ddb29bb 100644
--- a/include/linux/mtd/samsung_onenand.h
+++ b/include/linux/mtd/samsung_onenand.h
@@ -127,5 +127,7 @@
 
 /* common initialize function */
 extern void s3c_onenand_init(struct mtd_info *);
+extern int s5pc110_chip_probe(struct mtd_info *);
+extern int s5pc210_chip_probe(struct mtd_info *);
 
 #endif