Hi Giuseppe, Here is a build dependency: the below commit used some functions provided by the immediate next commit "phy: add the EEE support and the way to access to the MMD registers." --- Kernel build failed on tree: git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master head: a59a4d1921664da63d801ba477950114c71c88c9 commit: d765955d2ae0b88781a0db3a5bacfe4241925e09 [294/295] stmmac: add the Energy Efficient Ethernet support config: x86_64-allmodconfig All related error/warning messages: drivers/net/ethernet/stmicro/stmmac/stmmac_main.c: In function 'stmmac_eee_init': drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:287:3: error: implicit declaration of function 'phy_init_eee' [-Werror=implicit-function-declaration] drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c: In function 'stmmac_get_ethtool_stats': drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c:380:4: error: implicit declaration of function 'phy_get_eee_err' [-Werror=implicit-function-declaration] drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c: In function 'stmmac_ethtool_op_get_eee': drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c:494:2: error: implicit declaration of function 'phy_ethtool_get_eee' [-Werror=implicit-function-declaration] drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c: In function 'stmmac_ethtool_op_set_eee': drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c:519:2: error: implicit declaration of function 'phy_ethtool_set_eee' [-Werror=implicit-function-declaration] drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:287: 284 /* MAC core supports the EEE feature. */ 285 if (priv->dma_cap.eee) { 286 /* Check if the PHY supports EEE */ > 287 if (phy_init_eee(priv->phydev, 1)) 288 goto out; 289 290 priv->eee_active = 1; --- 0-DAY kernel build testing backend Open Source Technology Centre Fengguang Wu Intel Corporation