Hi, to further improve the driver vt6655 I was reading through the cfg80211 subsystem documentation. https://www.kernel.org/doc/html/latest/driver-api/80211/cfg80211.html#device... The following table shows structs/functions named in the documentation with driver vt6655 implementation status: Documentation in v6655 implemented struct ieee80211_channel yes struct ieee80211_rate yes struct ieee80211_sta_ht_cap no struct ieee80211_supported_band yes struct ieee80211_iface_limit no struct ieee80211_iface_combination no struct wiphy minimal used struct wiphy *wiphy_new(...) no int wiphy_register(struct wiphy *wiphy) no void wiphy_unregister(...) no void wiphy_free(struct wiphy *wiphy) no struct wireless_dev no struct net_device no Does it make sense to start the implementation here? With which struct/function start first? Thanks for your support. Bye Philipp