diff options
| author | Stephen Boyd <sboyd@codeaurora.org> | 2015-06-01 18:47:56 -0700 |
|---|---|---|
| committer | Srinivas Kandagatla <srinivas.kandagatla@linaro.org> | 2015-11-17 09:23:39 +0000 |
| commit | b457a8762e06b5153dc0e1f5f457c2c5921178f0 (patch) | |
| tree | d3242266ce835362f296f43bbc77d710ce3f0441 /include | |
| parent | 6a13feb9c82803e2b815eca72fa7a9f5561d7861 (diff) | |
PM / OPP: Support adjusting OPP voltages at runtime
On some SoCs the Adaptive Voltage Scaling (AVS) technique is
employed to optimize the operating voltage of a device. At a
given frequency, the hardware monitors dynamic factors and either
makes a suggestion for how much to adjust a voltage for the
current frequency, or it automatically adjusts the voltage
without software intervention. Add an API to the OPP library for
the former case, so that AVS type devices can update the voltages
for an OPP when the hardware determines the voltage should
change. The assumption is that drivers like CPUfreq or devfreq
will register for the OPP notifiers and adjust the voltage
according to suggestions that AVS makes.
Cc: Nishanth Menon <nm@ti.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/pm_opp.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index e817722ee3f0..16380b1f49b5 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -22,6 +22,7 @@ struct device; enum dev_pm_opp_event { OPP_EVENT_ADD, OPP_EVENT_REMOVE, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE, + OPP_EVENT_ADJUST_VOLTAGE, }; #if defined(CONFIG_PM_OPP) @@ -50,6 +51,9 @@ int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt); void dev_pm_opp_remove(struct device *dev, unsigned long freq); +int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, + unsigned long u_volt); + int dev_pm_opp_enable(struct device *dev, unsigned long freq); int dev_pm_opp_disable(struct device *dev, unsigned long freq); @@ -114,6 +118,12 @@ static inline void dev_pm_opp_remove(struct device *dev, unsigned long freq) { } +static inline int dev_pm_opp_adjust_voltage(struct device *dev, + unsigned long freq, unsigned long u_volt) +{ + return 0; +} + static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq) { return 0; |