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Date: Thu, 18 Jun 2020 20:10:17 +0100 From: Russell King - ARM Linux admin <linux@...linux.org.uk> To: Florian Fainelli <f.fainelli@...il.com> Cc: Helmut Grohne <helmut.grohne@...enta.de>, Nicolas Ferre <nicolas.ferre@...rochip.com>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley <paul.walmsley@...ive.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: [PATCH] net: macb: reject unsupported rgmii delays On Thu, Jun 18, 2020 at 12:02:13PM -0700, Florian Fainelli wrote: > It should not, but that means that when you describe the fixed-link, the > 'phy-mode' within the local fixed-link node is meant to describe how the > other side is configured not how you are configured. For some reason I > did not consider that to be intuitive when I sent out my response, but I > suppose spelling it out would greatly help. Right, so in the MAC-to-MAC setup that is being discussed in this thread, the _local_ side MAC where phy-mode is specified should not care which of the RGMII modes is specified, because the delays are a function of "the other side" of the link. So, the proposal that macb should limit itself to only accepting "rgmii" in it's _local_ phy-mode property because the _local_ MAC does not support delays is wrong. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
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