cpufreq: dt: Identify cpu-sharing for platforms without operating-points-v2

Existing platforms, which do not support operating-points-v2, can
explicitly tell the opp core that some of the CPUs share opp tables,
with help of dev_pm_opp_set_sharing_cpus().

For such platforms, explicitly ask the opp core to provide list of CPUs
sharing the opp table with current cpu device, before falling back to
platform data.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 5f8dbe6..aca9bec 100644 (file)
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -147,7 +147,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
        struct clk *cpu_clk;
        struct dev_pm_opp *suspend_opp;
        unsigned int transition_latency;
-       bool opp_v1 = false;
+       bool fallback = false;
        const char *name;
        int ret;
 
@@ -167,14 +167,16 @@ static int cpufreq_init(struct cpufreq_policy *policy)
        /* Get OPP-sharing information from "operating-points-v2" bindings */
        ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
        if (ret) {
+               if (ret != -ENOENT)
+                       goto out_put_clk;
+
                /*
                 * operating-points-v2 not supported, fallback to old method of
-                * finding shared-OPPs for backward compatibility.
+                * finding shared-OPPs for backward compatibility if the
+                * platform hasn't set sharing CPUs.
                 */
-               if (ret == -ENOENT)
-                       opp_v1 = true;
-               else
-                       goto out_put_clk;
+               if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus))
+                       fallback = true;
        }
 
        /*
@@ -214,7 +216,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
                goto out_free_opp;
        }
 
-       if (opp_v1) {
+       if (fallback) {
                struct cpufreq_dt_platform_data *pd = cpufreq_get_driver_data();
 
                if (!pd || !pd->independent_clocks)