devfreq_cooling: pass a pointer to devfreq in the power model callbacks
When the devfreq cooling device was designed, it was an oversight not to
pass a pointer to the struct devfreq as the first parameters of the
callbacks. The design patterns of the kernel suggest it for a good
reason.
By passing a pointer to struct devfreq, the driver can register one
function that works with multiple devices. With the current
implementation, a driver that can work with multiple devices has to
create multiple copies of the same function with different parameters so
that each devfreq_cooling_device can use the appropriate one. By
passing a pointer to struct devfreq, the driver can identify which
device it's referring to.
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Reviewed-by: Punit Agrawal <punit.agrawal@arm.com>
Reviewed-by: Ørjan Eide <orjan.eide@arm.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
diff --git a/include/linux/devfreq_cooling.h b/include/linux/devfreq_cooling.h
index 3049f94..c35d0c0 100644
--- a/include/linux/devfreq_cooling.h
+++ b/include/linux/devfreq_cooling.h
@@ -36,8 +36,10 @@
* @dyn_power_coeff * frequency * voltage^2
*/
struct devfreq_cooling_power {
- unsigned long (*get_static_power)(unsigned long voltage);
- unsigned long (*get_dynamic_power)(unsigned long freq,
+ unsigned long (*get_static_power)(struct devfreq *devfreq,
+ unsigned long voltage);
+ unsigned long (*get_dynamic_power)(struct devfreq *devfreq,
+ unsigned long freq,
unsigned long voltage);
unsigned long dyn_power_coeff;
};