RE: Zephyr Device Driver Developement dynamic Power Management Hoo in Trigger_OWN_THREAD

Kazi Afroza Sultana — Thu, 05 Jun 2025 14:40:45 GMT

Hello,

''I have not figured out a better way as using a method to start/stop the thread from normal_user and hook in with the

calls of

- pm_device_runtime_put(dev);

- pm_device_runtime_get(dev);

for powering up/down the nau7802 device.''

When the device runtime power management strategy is enabled on a device, it will go into the suspend state during the initialization process. Then, when the device is to be used, it is the device driver’s responsibility to notify the power management subsystem about this fact. This can be done using the pm_device_runtime_get() function.

When the device’s operation is complete and the device does not need to be in operational mode anymore, the device driver needs to notify the PM subsystem to let it put the device into the suspend state by calling pm_device_runtime_put().

So, your approach using pm_device_runtime_get() and pm_device_runtime_put() in your thread management logic—is valid and in accordance the with Zephyr’s intended device power management strategy (https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-7-device-driver-dev/topic/exercise-2-adding-power-management-to-a-custom-driver/).