1 files changed, 1 insertions, 0 deletions
diff --git a/device.h b/device.h
index da65a37..fed820e 100644
--- a/device.h
+++ b/device.h
@@ -55,6 +55,7 @@ struct io_register {
 };
 
 #define REG_TO_OFF(reg)	((reg) * sizeof(uint32_t))
+#define OFF_TO_REG(off)	((off) / sizeof(uint32_t))
 
 extern void io_register_init(struct io_register *reg, uint32_t addr,
 			     uint32_t valid, uint32_t readonly, uint32_t value);