diff --git a/hw/i2c/versatile_i2c.c b/hw/i2c/versatile_i2c.c
index 1ac2a6f59a..040139d701 100644
--- a/hw/i2c/versatile_i2c.c
+++ b/hw/i2c/versatile_i2c.c
@@ -24,6 +24,7 @@
 #include "qemu/osdep.h"
 #include "hw/sysbus.h"
 #include "hw/i2c/bitbang_i2c.h"
+#include "hw/registerfields.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
 
@@ -40,14 +41,19 @@ typedef struct VersatileI2CState {
     int in;
 } VersatileI2CState;
 
+REG32(CONTROL_GET, 0)
+REG32(CONTROL_SET, 0)
+REG32(CONTROL_CLR, 4)
+
 static uint64_t versatile_i2c_read(void *opaque, hwaddr offset,
                                    unsigned size)
 {
     VersatileI2CState *s = (VersatileI2CState *)opaque;
 
-    if (offset == 0) {
+    switch (offset) {
+    case A_CONTROL_SET:
         return (s->out & 1) | (s->in << 1);
-    } else {
+    default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Bad offset 0x%x\n", __func__, (int)offset);
         return -1;
@@ -60,10 +66,10 @@ static void versatile_i2c_write(void *opaque, hwaddr offset,
     VersatileI2CState *s = (VersatileI2CState *)opaque;
 
     switch (offset) {
-    case 0:
+    case A_CONTROL_SET:
         s->out |= value & 3;
         break;
-    case 4:
+    case A_CONTROL_CLR:
         s->out &= ~value;
         break;
     default: