WIZnet W5100/W5200/W5300/W5500 embedded Ethernet controllers
A family of small single-chip Ethernet controllers from Korean vendor WIZnet, popular in embedded and industrial designs and on hobbyist boards (including many Arduino Ethernet shields). The chips attach over SPI or a parallel bus and provide a complete 10/100 Mbps MAC and PHY in one package, and several variants — notably the W5500 and W5300 — are still sold new in 2025.
recommendation
Worth keeping but documenting its niche, because WIZnet still ships the W5500 and W5300 as current products and the code saw upstream maintenance touches as recently as 2025, yet Linux deployments are limited to embedded and industrial gear. An annotation noting that the W5200 is no longer recommended for new designs, while the W5100/W5300/W5500 remain available, would help future maintainers gauge its relevance.
repository signals
sources
- lore.kernel.org
The driver directory was still being touched upstream in 2025, indicating it is not abandoned in-tree.
- docs.wiznet.io
WIZnet still listed W5500, W5300, and W5100 in its Ethernet product family page in 2026; the page also notes W5200 is not recommended for new design.
- docs.wiznet.io
W5500 remained a current WIZnet product, supporting the claim that part of this driver family is still sold new in 2025.
- docs.wiznet.io
W5300 remained documented as a current WIZnet product, supporting continuing niche industrial/embedded availability.
codex reasoning notes (technical)
Local source inspection via exec_command showed this directory is a real driver and that `w5100-spi.c` supports W5100/W5200/W5500 while `w5300.c` covers W5300. lore_activity on `drivers/net/ethernet/wiznet/w5100.c` returned 2025 upstream touches (URL above), but they were mostly treewide maintenance rather than feature work, so activity is present but modest. Web search on official WIZnet docs found current product pages for W5500 and W5300 plus the Ethernet family matrix; that supports keeping the driver because at least part of the family is still sold, while annotating makes sense because deployments are niche Linux embedded/industrial and W5200 is explicitly not recommended for new designs. No natural upstream replacement driver was identified for the same chips.