[PATCH 1/3] PM: Provide an always on power domain governor

[broonie@opensource.wolfsonmicro.com (Mark Brown)]

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>
---
 drivers/base/power/domain_governor.c |   13 +++++++++++++
 include/linux/pm_domain.h            |    2 ++
 2 files changed, 15 insertions(+), 0 deletions(-)

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 @@ 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 fbb81bc..fda14f1 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -139,6 +139,7 @@ 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)
@@ -192,6 +193,7 @@ 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)
-- 
1.7.7.3