cpufreq: create cpufreq_generic_init() routine

Many CPUFreq drivers for SMP system (where all cores share same clock lines), do
similar stuff in their ->init() part.

This patch creates a generic routine in cpufreq core which can be used by these
so that we can remove some redundant code.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index f033adf06eaf..985f325adc4f 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -181,6 +181,37 @@ u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy)
 }
 EXPORT_SYMBOL_GPL(get_cpu_idle_time);
 
+/*
+ * This is a generic cpufreq init() routine which can be used by cpufreq
+ * drivers of SMP systems. It will do following:
+ * - validate & show freq table passed
+ * - set policies transition latency
+ * - policy->cpus with all possible CPUs
+ */
+int cpufreq_generic_init(struct cpufreq_policy *policy,
+                struct cpufreq_frequency_table *table,
+                unsigned int transition_latency)
+{
+        int ret;
+
+        ret = cpufreq_table_validate_and_show(policy, table);
+        if (ret) {
+                pr_err("%s: invalid frequency table: %d\n", __func__, ret);
+                return ret;
+        }
+
+        policy->cpuinfo.transition_latency = transition_latency;
+
+        /*
+         * The driver only supports the SMP configuartion where all processors
+         * share the clock and voltage and clock.
+         */
+        cpumask_setall(policy->cpus);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_generic_init);
+
 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 {
         struct cpufreq_policy *policy = NULL;