A Primer to Clocks and Power Management Through ARM SCMI
summary
ARM SCMI gets implemented inside ARM Trusted Firmware to expose clock and power controls to Linux and other cores using shared memory or SMC transports; an AM62/K3-style system lists dozens of power domains and clocks (IDs must be contiguous from 0) and ATF advertises them at boot so Linux can toggle PDs and set rates via debugfs—examples show successful on/off and rate changes but reveal limits: ATF uses 16‑char names and adds latency, prompting lazy initialization and pinctrl work.
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chapters (8)
- 0:00Clocks and power management intro
- 1:48ARM SCMI basics
- 3:54Central clock/power entity
- 8:49SCMI in Linux & ARM TF
- 13:28Implementing SCMI in TF
- 16:59Linux SCMI support
- 20:52SCMI improvements & limits
- 24:10Q&A
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