Adding Runtime Power Management Capabilities to Device Drivers
summary
Adds runtime-PM to the LTRF216A light sensor driver using helper calls like pm_runtime_resume_and_get and pm_runtime_mark_last_busy, enabling autosuspend with a 1 s inactivity delay via pm_runtime_set_autosuspend_delay. Device resumes before I/O and marks last busy after, so PM core defers suspend; overall system power drops when many devices adopt this pattern. Suspend clears hardware registers; solution is regcache restore on resume.
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chapters (5)
- 0:00Start
- 10:14Helper functions Initialization and Enabling
- 15:20Helper functions - Autosuspend
- 22:31Adding RPM support to LTRF216A light sensor driver
- 26:10What issues you might face?
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