Power management-Device State

[zephyrbot]

Reported by Robert Beatty:

The RTOS shall facilitate device state power management.

(Imported from Jira ZEP-1944)

[zephyrbot]

by Robert Beatty:

"Legacy Requirement , already supported
Confirm if current support is sufficient"

[zephyrbot]

by Youvedeep Singh:

Hi Robert Beatty

Current Zephyr implementation "Legacy suspend/resume of device" while entering into Sleep state.
Any driver can make call back to
device_set_power_state(struct device *device, uint32_t device_power_state) with 2nd parameter as "DEVICE_PM_SUSPEND_STATE" (for suspending) or DEVICE_PM_ACTIVE_STATE.
provided device has implemented "device_pm_control" inside "device --> config".

Can you please elaborate further - what is needed on this front from OS perspective?

[zephyrbot]

by Robert Beatty:

Youvedeep Singh , responding directly over email.

[ramakrishnapallala]

Zephyr already supports device PM states and this can be closed.
DEVICE_PM_ACTIVE_STATE
DEVICE_PM_LOW_POWER_STATE
DEVICE_PM_SUSPEND_STATE