> +int phy_interface_num_ports(phy_interface_t interface) > +{ > + switch (interface) { > + case PHY_INTERFACE_MODE_NA: > + case PHY_INTERFACE_MODE_INTERNAL: > + return 0; I've not yet looked at how this is used. Returning 0 could have interesting effects i guess? INTERNAL clearly does have some sort of path between the MAC and the PHY, so i think 1 would be a better value. NA is less clear, it generally means Don't touch. But again, there still needs to be a path between the MAC and PHY, otherwise there would not be any to touch. Why did you pick 0? > + > + case PHY_INTERFACE_MODE_MII: > + case PHY_INTERFACE_MODE_GMII: > + case PHY_INTERFACE_MODE_TBI: > + case PHY_INTERFACE_MODE_REVMII: > + case PHY_INTERFACE_MODE_RMII: > + case PHY_INTERFACE_MODE_REVRMII: > + case PHY_INTERFACE_MODE_RGMII: > + case PHY_INTERFACE_MODE_RGMII_ID: > + case PHY_INTERFACE_MODE_RGMII_RXID: > + case PHY_INTERFACE_MODE_RGMII_TXID: > + case PHY_INTERFACE_MODE_RTBI: > + case PHY_INTERFACE_MODE_XGMII: > + case PHY_INTERFACE_MODE_XLGMII: > + case PHY_INTERFACE_MODE_MOCA: > + case PHY_INTERFACE_MODE_TRGMII: > + case PHY_INTERFACE_MODE_USXGMII: > + case PHY_INTERFACE_MODE_SGMII: > + case PHY_INTERFACE_MODE_SMII: > + case PHY_INTERFACE_MODE_1000BASEX: > + case PHY_INTERFACE_MODE_2500BASEX: > + case PHY_INTERFACE_MODE_5GBASER: > + case PHY_INTERFACE_MODE_10GBASER: > + case PHY_INTERFACE_MODE_25GBASER: > + case PHY_INTERFACE_MODE_10GKR: > + case PHY_INTERFACE_MODE_100BASEX: > + case PHY_INTERFACE_MODE_RXAUI: > + case PHY_INTERFACE_MODE_XAUI: > + return 1; > + case PHY_INTERFACE_MODE_QSGMII: > + case PHY_INTERFACE_MODE_QUSGMII: > + return 4; > + > + default: > + return 0; > + } > +} Have you tried without a default: ? I _think_ gcc will then warn about missing enum values, which will help future developers when they add further values to the enum. Andrew