On 15/10/15 12:59, Dinh Nguyen wrote: > On 10/15/2015 03:03 PM, Florian Fainelli wrote: >> On 15/10/15 12:09, Dinh Nguyen wrote: >>> Hi, >>> >>> commit "8b63ec1837fa phylib: Make PHYs children of their MDIO bus, not >>> the bus' parent." seems to have broken ethernet support for the SoCFPGA >>> platform which is using the stmmac ethernet driver. >> >> It is not clear to me how this relates to what you are seeing yet. >> >>> >>> It appears that during DHCP, it cannot get an IP address. This only >>> happens if ethernet was not used by the bootloader to tftp an kernel >>> image. If I use the bootloader to tftp an image then ethernet is working >>> fine. So I think the PHY is not getting enabled properly. >>> >>> If I revert this patch, then ethernet is back to working on the platform. >> >> Is the Device Tree source for this platform available somewhere to look at? >> > > Yes, I'm using the DTS that is in the mainline: > > arch/arm/boot/dts/socfpga.dtsi > arch/arm/boot/dts/socfpga_cyclone5.dtsi > arch/arm/boot/dts/socfpga_cyclone5_socdk.dts
There are no PHY devices in any of these DTS files, instead there is the non-standard "phy-addr" property which is set to 0xffffffff supposedly to indicate that the MDIO bus should be scanned. This is likely part of your problem. The stmmac driver seems to be looking for "snps,phy-addr" and not "phy-addr", so I am not even clear how this is supposed to work, and the driver mentions this custom property is deprecated anyway. The core problem is in drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c::stmmac_mdio_register which manually detects the PHY, that is mostly fine, except that it does not really seem to work here for a reason that is still unclear to me. Your Ethernet PHYs need to be declared in Device Tree, see Documentation/devicetree/bindings/net/phy.txt but aside from that, what should be the PHY driver used by our platform? ID 00221611 does not seem to be claimed by any known PHY driver, so that leave us with the Generic PHY driver I guess? Do you have specific PHY fixups required for this platform? -- Florian -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
