PM / Domains: Provide an always on power domain governor

Since systems are likely to have power domains that can't be turned off
for various reasons at least temporarily while implementing power domain
support provide a default governor which will always refuse to power off
the domain, saving platforms having to implement their own.

Since the code is so tiny don't bother with a Kconfig symbol for it.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c
index da78540e9b406bbb70d831f82a012c9c1b810538..51527ee92d101018680cd5b633265105a2952df1 100644 (file)
--- a/drivers/base/power/domain_governor.c
+++ b/drivers/base/power/domain_governor.c
@@ -141,3 +141,16 @@ struct dev_power_governor simple_qos_governor = {
        .stop_ok = default_stop_ok,
        .power_down_ok = default_power_down_ok,
 };
+
+static bool always_on_power_down_ok(struct dev_pm_domain *domain)
+{
+       return false;
+}
+
+/**
+ * pm_genpd_gov_always_on - A governor implementing an always-on policy
+ */
+struct dev_power_governor pm_domain_always_on_gov = {
+       .power_down_ok = always_on_power_down_ok,
+       .stop_ok = default_stop_ok,
+};

diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index fb809b9048919eb54e246043fb4747e32e9216d4..a03a0ad998b81498b26697927931606d0349e13d 100644 (file)
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -140,6 +140,7 @@ extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
 
 extern bool default_stop_ok(struct device *dev);
 
+extern struct dev_power_governor pm_domain_always_on_gov;
 #else
 
 static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
@@ -193,6 +194,7 @@ static inline bool default_stop_ok(struct device *dev)
 {
        return false;
 }
+#define pm_domain_always_on_gov NULL
 #endif
 
 static inline int pm_genpd_remove_callbacks(struct device *dev)