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Date: Tue, 25 Jun 2019 11:51:01 +0100 From: Russell King - ARM Linux admin <linux@...linux.org.uk> To: Parshuram Raju Thombare <pthombar@...ence.com> Cc: Andrew Lunn <andrew@...n.ch>, "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>, "davem@...emloft.net" <davem@...emloft.net>, "f.fainelli@...il.com" <f.fainelli@...il.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "hkallweit1@...il.com" <hkallweit1@...il.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Rafal Ciepiela <rafalc@...ence.com>, Anil Joy Varughese <aniljoy@...ence.com>, Piotr Sroka <piotrs@...ence.com> Subject: Re: [PATCH v4 4/5] net: macb: add support for high speed interface On Tue, Jun 25, 2019 at 08:26:29AM +0000, Parshuram Raju Thombare wrote: > Hi Andrew, > > >What i'm saying is that the USXGMII rate is fixed. So why do you need a device > >tree property for the SERDES rate? > This is based on Cisco USXGMII specification, it specify USXGMII 5G and USXGMII 10G. > Sorry I can't share that document here. The closed nature of the USXGMII spec makes it very hard for us to know whether your implementation is correct or not. I have some documentation which suggests that USVGMII is a USXGMII link running at "5GR" rate as opposed to USXGMII running at "10GR" rate. So, I think 5G mode should be left out until it becomes clear that (a) we should specify it as USXGMII with a 5G rate, or as USVGMII. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up
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