Power Management Integrated Circuits: Keep the Power in Your Hands
Talkat Embedded Linux Conference + OpenIoT Summit North America 2017 · on Wednesday, 2017-02-22· at 10:30· Grand Ballroom I/II·
summary
Describes how PMICs are integrated into Linux via concrete subsystems and code patterns, using XP20x/22x PMICs on Allwinner boards as examples: regulator ops with voltage range 700 mV–2.275 V in 25 µV steps, power rails selected among 0.3–11 V inputs, regmap to avoid concurrent register access, and ADC channels exposed through IIO with micro‑unit scaling mapped into the power_supply framework. Covers MFD cell probing, ADC→power_supply channel mapping, fuel‑gauge CV curve points stored in the PMIC, and which drivers are mainline versus still pending.
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chapters (24)
- 0:00Introduction
- 0:24About Quentin Schulz
- 1:10Summary
- 1:43What is a PM
- 4:31Example of a PM
- 8:05PMAC
- 12:59Regulator Subsystem
- 14:07External Supply
- 15:23For Supplies Subsystem
- 17:10For Supplies Driver
- 18:53Read Write Structure
- 19:09GetSet Property
- 20:06Driver Data
- 20:26MISS Features
- 22:01Current Data
- 22:39ADC Driver
- 24:04ADC Scale
- 31:14Consumer Channel
- 32:05Battery Percentage
- 35:58FD Cell
- 36:58TPM
- 37:16Drivers
- 37:36Example
- 39:11Conclusion
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