mtd: kirkwood: allow machines to register RnB callback

Add a kirkwood_nand_init_rnb() call to allow boards which
have RnB line detection to register this instead of a
static delay.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/arch/arm/mach-kirkwood/common.h b/arch/arm/mach-kirkwood/common.h
index d7de434..05e8a8a 100644
--- a/arch/arm/mach-kirkwood/common.h
+++ b/arch/arm/mach-kirkwood/common.h
@@ -16,6 +16,7 @@
 struct mv_sata_platform_data;
 struct mvsdio_platform_data;
 struct mtd_partition;
+struct mtd_info;
 
 /*
  * Basic Kirkwood init functions used early by machine-setup.
@@ -41,6 +42,7 @@
 void kirkwood_uart0_init(void);
 void kirkwood_uart1_init(void);
 void kirkwood_nand_init(struct mtd_partition *parts, int nr_parts, int delay);
+void kirkwood_nand_init_rnb(struct mtd_partition *parts, int nr_parts, int (*dev_ready)(struct mtd_info *));
 
 extern int kirkwood_tclk;
 extern struct sys_timer kirkwood_timer;