+/**
+ * cpufreq_add_dev - the cpufreq interface for a CPU device.
+ * @dev: CPU device.
+ * @sif: Subsystem interface structure pointer (not used)
+ */
+static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
+{
+ unsigned cpu = dev->id;
+ int ret;
+
+ dev_dbg(dev, "%s: adding CPU%u\n", __func__, cpu);
+
+ if (cpu_online(cpu)) {
+ ret = cpufreq_online(cpu);
+ } else {
+ /*
+ * A hotplug notifier will follow and we will handle it as CPU
+ * online then. For now, just create the sysfs link, unless
+ * there is no policy or the link is already present.
+ */
+ struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
+
+ ret = policy && !cpumask_test_and_set_cpu(cpu, policy->real_cpus)
+ ? add_cpu_dev_symlink(policy, cpu) : 0;
+ }
+
+ return ret;
+}
+