Hi! On Mon, Apr 22, 2019 at 9:28 PM Andrew Lunn <andrew@xxxxxxx> wrote: > [...] > > + /* > > + * On most (all?) Atheros/QCA SoCs dual eth interfaces are not equal. > > + * > > + * That is to say eth0 can not work independently. It only works > > + * when eth1 is working. > > + */ > > Please could you explain that some more? Is there just one MDIO bus > shared by two ethernet controllers? If so, it would be better to have > the MDIO bus controller as a separate driver. mdio registers exists on both ethernet blocks. And due to how reset works on this ethernet IP, it's hard to split it into a separated driver. (Only asserting both eth and mdio resets together will reset everything including register values.) The reason why gmac1 should be brought up first is that on some chips, mdio on gmac0 connects to nothing and phy used by gmac0 is on mdio bus of gmac1. > [...] Regards, Chuanhong Guo
