Extending Power Over Ethernet to the LTC4266
summary
Adds LTC4266 driver RFC to the Linux PoE framework to support the last major PSE chipset used across many Ericsson routers, implements semi‑automatic mode (detect/classify in hardware, software decides enable), exposes control via netlink/ethtool user API, and surfaces a tricky behavior: the chip enforces current‑based limiting (not power), which complicates system-level budgeting. Driver is posted as RFC and aims for upstream merge soon; discovery of a Skyworks chipset on the mailing list surprised the author.
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chapters (7)
- 0:00PoE and LTC4266 intro
- 3:14Power over Ethernet fundamentals
- 8:42Type three and four PoE specifications
- 11:11PoE power budgeting
- 14:24Kernel PoE framework
- 16:14LTC4266 kernel support
- 18:02Q&A
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