> -----Original Message----- > From: Andrew Lunn [mailto:andrew@xxxxxxx] > Sent: Wednesday, July 06, 2016 7:51 PM > To: Punnaiah Choudary Kalluri <punnaia@xxxxxxxxxx> > Cc: Appana Durga Kedareswara Rao <appanad@xxxxxxxxxx>; > robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; Michal Simek > <michals@xxxxxxxxxx>; Soren Brinkmann <sorenb@xxxxxxxxxx>; > nicolas.ferre@xxxxxxxxx; f.fainelli@xxxxxxxxx; Anirudha Sarangi > <anirudh@xxxxxxxxxx>; Harini Katakam <harinik@xxxxxxxxxx>; > netdev@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > Subject: Re: [RFC PATCH v2 1/4] Documentation: DT: net: Add Xilinx > gmiitorgmii converter device tree binding documentation > > > > Hi Kedareswara > > > > > > So looking at the device tree, you have the gmiitorgmii as an mdio > > > device. It will get probed as an mdio device, and from that you know > > > the address on the bus. However, your driver does not actually do > > > this. xilinx_gmii2rgmii.c is just a library of two functions, and does > > > not use any of this device tree information. You device tree binding > > > is completely bogus. > > > > > > What i think is a much more logical structure, and fits the hardware, > > > which is what DT is all about, is to make your driver an mdio driver. > > > Also, have a phy-handle pointing to the PHY in the gmii_to_rgmii node. > > > You then no longer need the exported gmii2rgmii_phyprobe() function. > > > > > > Next, you want gmiitorgmii driver to register a phy. The MAC driver > > > can then look this up using phy-handle: > > > > > > mdio { > > > #address-cells = <1>; > > > #size-cells = <0>; > > > > > > phy: ethernet-phy@0 { > > > reg = <0>; > > > }; > > > > > > gmii_to_rgmii: gmii-to-rgmii@8 { > > > compatible = "xlnx,gmiitorgmii"; > > > reg = <8>; > > > phy-handle = <&phy>; > > > }; > > > }; > > > > > > Thanks for your inputs initially we too thought the similar implementation > > But the GMII2RGMII converter contains only one register and it is > > not compatible to the standard ethernet MII interface. Also it doesn't have > > a standard VID and PID registers So, during the mdio bus scan, this device > will > > not appear. > > Hi Punnaiah > > Use missed some subtlety in my description. I did not call the > GMII2RGMII a PHY device, i called it an MDIO device. These are > different things. Go look at the MDIO subsystem to figure out the > difference. > Hi Andrew Got it. Thanks. Punnaiah > Andrew -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
