There are cases for CPUfreq driver flags to be exposed outside of the CPUfreq core code. In particular the CPUFREQ_NO_SLEEP flag can be used by CPUfreq governors to optimize when and how they call that drivers .target callback. In fact this knowledge is a requirement for the on-going work to initiate cpu frequency transitions from the scheduler.
This patch implements a simple function to return the CPUfreq driver flags. While currently the flags are a u8, that could grow at a future date and cpufreq_driver_get_flags returns an int. Additionally the function needs to return an error in case no driver is registered.
Signed-off-by: Mike Turquette mturquette@linaro.org --- drivers/cpufreq/cpufreq.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 9b471b2..f3b9042 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1980,6 +1980,15 @@ int cpufreq_driver_target(struct cpufreq_policy *policy, } EXPORT_SYMBOL_GPL(cpufreq_driver_target);
+int cpufreq_driver_get_flags(void) +{ + if (!cpufreq_driver) + return -ENODEV; + + return cpufreq_driver->flags; +} +EXPORT_SYMBOL_GPL(cpufreq_driver_get_flags); + /* * when "event" is CPUFREQ_GOV_LIMITS */