linux-drivers/
drivers/net/wireless/broadcom/brcm80211/brcmfmac/cyw

Cypress/Infineon CYW FullMAC Wi-Fi chipsets (brcmfmac plugin)

A vendor-specific extension to the brcmfmac driver that handles Cypress (now Infineon) CYW-series FullMAC Wi-Fi chipsets such as the CYW43012, CYW43439, CYW4373, CYW89359, and CYW54591. These parts are widely used in IoT modules, industrial gear, and small embedded boards (including Raspberry Pi Wi-Fi/Bluetooth combos) and are still being sold new in 2025.

keep conf=0.86 last_sold=2025 deploy=medium replacement=none subsystem=net category=networking-wireless
86%

recommendation

It should stay in the kernel because the CYW-series Wi-Fi parts (CYW43012, CYW43439, CYW4373, CYW89359, CYW54591) are still sold as active products by Infineon in 2025 and are common in IoT and embedded boards, including Raspberry Pi-class devices. Upstream activity is healthy: linux-wireless saw new feature work in April 2025 (external SAE support) and bug fixes in July 2025 (WPA3/EXTSAE regression), so the code is actively maintained rather than drifting.

repository signals

5 files
498 source lines
14 commits, 5y
+541 / −31 lines added / removed, 5y
8 authors, 5y
monthly commits · 2021-04-21 → 2026-04-21 · 14 total · active in 7/61 months
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sources

  1. spinics.net

    April 25, 2025 linux-wireless patch series adds CYW external SAE support, showing active upstream feature work in this directory.

  2. spinics.net

    July 23, 2025 linux-wireless patch fixes a CYW WPA3/EXTSAE regression, showing current bug-fix traffic rather than abandonment.

  3. infineon.com

    Infineon lists CYW43012 as Active, with Linux support and stock/buying options, indicating new hardware sales in 2025.

  4. infineon.com

    Infineon lists CYW43439 as Active and preferred, Linux-supported, and aimed at current IoT/industrial applications.

codex reasoning notes (technical)

Local `exec_command` inspection showed this is a real brcmfmac vendor plugin (`module.c` says Cypress/Infineon chipsets) and local source tables tie CYW handling to CYW43012/CYW43439/CYW4373/CYW89359/CYW54591-class devices. `web.search_query` found 2025 linux-wireless patch traffic at the two spinics URLs, with no removal/deprecation thread surfaced in available lore-equivalent search results. The two Infineon product URLs were also obtained via `web.search_query` and show CYW parts still active/new-sale Linux-supported in 2025, so this is an actively maintained embedded/IoT driver family with no natural upstream replacement beyond the existing brcmfmac stack.