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 da78540..51527ee 100644
--- a/drivers/base/power/domain_governor.c
+++ b/drivers/base/power/domain_governor.c
@@ -141,3 +141,16 @@
.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 fb809b9..a03a0ad 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -140,6 +140,7 @@
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 @@
{
return false;
}
+#define pm_domain_always_on_gov NULL
#endif
static inline int pm_genpd_remove_callbacks(struct device *dev)