PM / OPP: Add support for opp-suspend

With "operating-points-v2" bindings, it's possible to specify the OPP to
which the device must be switched, before suspending.

This patch adds support for getting that information.

Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index 5d699e3..0ebcea4 100644 (file)
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -133,6 +133,7 @@ struct device_opp {
        struct device_node *np;
        unsigned long clock_latency_ns_max;
        bool shared_opp;
+       struct dev_pm_opp *suspend_opp;
 };
 
 /*
@@ -923,6 +924,16 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
        if (ret)
                goto free_opp;
 
+       /* OPP to select on device suspend */
+       if (of_property_read_bool(np, "opp-suspend")) {
+               if (dev_opp->suspend_opp)
+                       dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n",
+                                __func__, dev_opp->suspend_opp->rate,
+                                new_opp->rate);
+               else
+                       dev_opp->suspend_opp = new_opp;
+       }
+
        if (new_opp->clock_latency_ns > dev_opp->clock_latency_ns_max)
                dev_opp->clock_latency_ns_max = new_opp->clock_latency_ns;