From: Stas Sergeev Subject: Re: [PATCH 1/2] of_mdio: add new DT property 'link' for fixed-link Date: Fri, 10 Jul 2015 14:20:17 +0300 Message-ID: <559FAA71.2030209@list.ru> References: <559EB0A4.5080101@list.ru> <559EB1A6.1090008@list.ru> <559EBC59.6020003@gmail.com> <559EDD0C.7020907@list.ru> <559EE45C.4040408@gmail.com> <559EEAE9.4000806@list.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Sebastien Rannou Cc: Florian Fainelli , Linux kernel , Arnaud Ebalard , Stas Sergeev , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Grant Likely , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, netdev , Thomas Petazzoni List-Id: devicetree@vger.kernel.org 10.07.2015 11:46, Sebastien Rannou =D0=BF=D0=B8=D1=88=D0=B5=D1=82: > On Fri, 10 Jul 2015, Stas Sergeev wrote: >=20 >> 10.07.2015 00:15, Florian Fainelli =D0=BF=D0=B8=D1=88=D0=B5=D1=82: >>> Then, if the in-band status indication is not reliable (which reall= y >>> should be completely understood), >> Agree! >> But this is not something I can help with. >> Sebastien Rannou reports the problem, please ask him whatever >> you see fits to get a better understanding of a problem. >> The fact that his HW does not generate the inband status, is >> _my own guess_. >=20 > Yes, I confirm that my HW does not generate an in-band status. AFAIK,= it's > a PHY that aggregates 4xSGMIIs to 1xQSGMII ; the MAC side of the PHY = (with > inband status) is connected to the switch through QSGMII, and in this= context > we are on the media side of the PHY. Hmm, interesting. So if I parse the above correctly, you have something like 88E1340S set up into a mode when SGMII is used as media interface and QSGMII as syst= em interface (terms are from datasheet page 5), then you connect the media interface to armada-xp and system interface to the switch. I wonder if it is the right thing to do. AFAIK you could as well set up armada-xp into QSGMII mode and connect that to switch. The driver would then disable the use of inband status and everything would be fine. Either way, your use-case proves that only DT can decide the use of an inband status. -- To unsubscribe from this list: send the line "unsubscribe devicetree" i= n the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html