struct cpufreq_policy *policy = cpufreq_cpu_get(0);
        unsigned int arm_volt, safe_arm_volt = 0;
        unsigned int mpll_freq_khz = exynos_info->mpll_freq_khz;
+       struct device *dev = exynos_info->dev;
        unsigned int old_freq;
        int index, old_index;
        int ret = 0;
                /* Firstly, voltage up to increase frequency */
                ret = regulator_set_voltage(arm_regulator, arm_volt, arm_volt);
                if (ret) {
-                       pr_err("%s: failed to set cpu voltage to %d\n",
-                               __func__, arm_volt);
+                       dev_err(dev, "failed to set cpu voltage to %d\n",
+                               arm_volt);
                        return ret;
                }
        }
                ret = regulator_set_voltage(arm_regulator, safe_arm_volt,
                                      safe_arm_volt);
                if (ret) {
-                       pr_err("%s: failed to set cpu voltage to %d\n",
-                               __func__, safe_arm_volt);
+                       dev_err(dev, "failed to set cpu voltage to %d\n",
+                               safe_arm_volt);
                        return ret;
                }
        }
                ret = regulator_set_voltage(arm_regulator, arm_volt,
                                arm_volt);
                if (ret) {
-                       pr_err("%s: failed to set cpu voltage to %d\n",
-                               __func__, arm_volt);
+                       dev_err(dev, "failed to set cpu voltage to %d\n",
+                               arm_volt);
                        goto out;
                }
        }
        if (!exynos_info)
                return -ENOMEM;
 
+       exynos_info->dev = &pdev->dev;
+
        if (soc_is_exynos4210())
                ret = exynos4210_cpufreq_init(exynos_info);
        else if (soc_is_exynos4212() || soc_is_exynos4412())
                goto err_vdd_arm;
 
        if (exynos_info->set_freq == NULL) {
-               pr_err("%s: No set_freq function (ERR)\n", __func__);
+               dev_err(&pdev->dev, "No set_freq function (ERR)\n");
                goto err_vdd_arm;
        }
 
        arm_regulator = regulator_get(NULL, "vdd_arm");
        if (IS_ERR(arm_regulator)) {
-               pr_err("%s: failed to get resource vdd_arm\n", __func__);
+               dev_err(&pdev->dev, "failed to get resource vdd_arm\n");
                goto err_vdd_arm;
        }
 
        if (!cpufreq_register_driver(&exynos_driver))
                return 0;
 
-       pr_err("%s: failed to register cpufreq driver\n", __func__);
+       dev_err(&pdev->dev, "failed to register cpufreq driver\n");
        regulator_put(arm_regulator);
 err_vdd_arm:
        kfree(exynos_info);