[PATCH V2 2/2] cpufreq: dt: Implement online/offline() callbacks

[Viresh Kumar]

Implement the light-weight tear down and bring up helpers to reduce the
amount of work to do on CPU offline/online operation.

Signed-off-by: Viresh Kumar <viresh.ku...@linaro.org>
---
 drivers/cpufreq/cpufreq-dt.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 7ba392911cd0..1aefaa1b0ca2 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -295,6 +295,21 @@ static int cpufreq_init(struct cpufreq_policy *policy)
        return ret;
 }
 
+static int cpufreq_online(struct cpufreq_policy *policy)
+{
+       /* We did light-weight tear down earlier, nothing to do here */
+       return 0;
+}
+
+static int cpufreq_offline(struct cpufreq_policy *policy)
+{
+       /*
+        * Preserve policy->driver_data and don't free resources on light-weight
+        * tear down.
+        */
+       return 0;
+}
+
 static int cpufreq_exit(struct cpufreq_policy *policy)
 {
        struct private_data *priv = policy->driver_data;
@@ -319,6 +334,8 @@ static struct cpufreq_driver dt_cpufreq_driver = {
        .get = cpufreq_generic_get,
        .init = cpufreq_init,
        .exit = cpufreq_exit,
+       .online = cpufreq_online,
+       .offline = cpufreq_offline,
        .name = "cpufreq-dt",
        .attr = cpufreq_dt_attr,
        .suspend = cpufreq_generic_suspend,
-- 
2.20.1.321.g9e740568ce00