diff options
| author | MyungJoo Ham <myungjoo.ham@samsung.com> | 2011-09-30 22:35:12 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-09-30 22:35:12 +0200 |
| commit | 03ca370fbf7b76d6d002380dbdc2cdc2319f9c80 (patch) | |
| tree | d6978f3139f109755e0b2966995527a44c2e4681 /include | |
| parent | a102a9ece5489e1718cd7543aa079082450ac3a2 (diff) | |
| download | linux-03ca370fbf7b76d6d002380dbdc2cdc2319f9c80.tar.bz2 | |
PM / OPP: Add OPP availability change notifier.
The patch enables to register notifier_block for an OPP-device in order
to get notified for any changes in the availability of OPPs of the
device. For example, if a new OPP is inserted or enable/disable status
of an OPP is changed, the notifier is executed.
This enables the usage of opp_add, opp_enable, and opp_disable to
directly take effect with any connected entities such as cpufreq or
devfreq.
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Mike Turquette <mturquette@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/opp.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/opp.h b/include/linux/opp.h index 7020e9736fc5..87a9208f8aec 100644 --- a/include/linux/opp.h +++ b/include/linux/opp.h @@ -16,9 +16,14 @@ #include <linux/err.h> #include <linux/cpufreq.h> +#include <linux/notifier.h> struct opp; +enum opp_event { + OPP_EVENT_ADD, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE, +}; + #if defined(CONFIG_PM_OPP) unsigned long opp_get_voltage(struct opp *opp); @@ -40,6 +45,8 @@ int opp_enable(struct device *dev, unsigned long freq); int opp_disable(struct device *dev, unsigned long freq); +struct srcu_notifier_head *opp_get_notifier(struct device *dev); + #else static inline unsigned long opp_get_voltage(struct opp *opp) { @@ -89,6 +96,11 @@ static inline int opp_disable(struct device *dev, unsigned long freq) { return 0; } + +struct srcu_notifier_head *opp_get_notifier(struct device *dev) +{ + return ERR_PTR(-EINVAL); +} #endif /* CONFIG_PM */ #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP) |