i2c_unregister_device(efx->board_info.hwmon_client);
 }
 
-static struct i2c_board_info sfn4111t_hwmon_info = {
+static struct i2c_board_info sfn4111t_a0_hwmon_info = {
        I2C_BOARD_INFO("max6647", 0x4e),
        .irq            = -1,
 };
 
+static struct i2c_board_info sfn4111t_r5_hwmon_info = {
+       I2C_BOARD_INFO("max6646", 0x4d),
+       .irq            = -1,
+};
+
 int sfn4111t_init(struct efx_nic *efx)
 {
        int rc;
 
        efx->board_info.hwmon_client =
-               i2c_new_device(&efx->i2c_adap, &sfn4111t_hwmon_info);
+               i2c_new_device(&efx->i2c_adap,
+                              (efx->board_info.minor < 5) ?
+                              &sfn4111t_a0_hwmon_info :
+                              &sfn4111t_r5_hwmon_info);
        if (!efx->board_info.hwmon_client)
                return -EIO;