[PATCH 08/10] OPP: Add support for opp-suspend

Viresh Kumar
2015-06-15T11:58:25Z

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

This patch adds support for getting that information.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/base/power/opp.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index 6b554e417b1f..0022453e4b60 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -137,6 +137,7 @@ struct device_opp {
struct device_node *np;
unsigned long clock_latency_ns_max;
bool shared_opp;
+ struct dev_pm_opp *suspend_opp;
};

/*
@@ -1218,6 +1219,8 @@ static int _of_init_opp_table_v2(struct device *dev,
goto put_opp_np;

if (!ret) {
+ const phandle *handle;
+
if (!dev_opp) {
dev_opp = _find_device_opp(dev);
if (WARN_ON(!dev_opp))
@@ -1227,6 +1230,25 @@ static int _of_init_opp_table_v2(struct device *dev,
dev_opp->np = opp_np;
if (of_get_property(opp_np, "opp-shared", NULL))
dev_opp->shared_opp = true;
+
+ /* OPP to select on device suspend */
+ handle = of_get_property(opp_np, "opp-suspend", NULL);
+ if (handle) {
+ struct device_node *suspend_opp_np;
+ struct dev_pm_opp *opp;
+
+ suspend_opp_np = of_find_node_by_phandle(be32_to_cpup(handle));
+
+ list_for_each_entry_rcu(opp, &dev_opp->opp_list, node)
+ if (opp->np == suspend_opp_np) {
+ dev_opp->suspend_opp = opp;
+ break;
+ }
+
+ if (!dev_opp->suspend_opp)
+ dev_err(dev, "%s: Invalid opp-suspend\n",
+ __func__);
+ }
} else {
of_free_opp_table(dev);
}
--
2.4.0