Le 12/8/18 à 7:12 AM, Andrew Lunn a écrit : > It is sometimes necessary to instantiate a bit-banging MDIO bus as a > platform device, without the aid of device tree. > > When device tree is being used, the bus is not scanned for devices, > only those devices which are in device tree are probed. Without device > tree, by default, all addresses on the bus are scanned. This may then > find a device which is not a PHY, e.g. a switch. And the switch may > have registers containing values which look like a PHY. So during the > scan, a PHY device is wrongly created. > > After the bus has been registered, a search is made for > mdio_board_info structures which indicates devices on the bus, and the > driver which should be used for them. This is typically used to > instantiate Ethernet switches from platform drivers. However, if the > scanning of the bus has created a PHY device at the same location as > indicated into the board info for a switch, the switch device is not > created, since the address is already busy. > > This can be avoided by setting the phy_mask of the mdio bus. This mask > prevents addresses on the bus being scanned. > > v2 > -- > int -> u32 in platform data structure > > Signed-off-by: Andrew Lunn <and...@lunn.ch>
Reviewed-by: Florian Fainelli <f.faine...@gmail.com> -- Florian
