From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Lunn Subject: Re: [PATCH 1/1] phy: Add 2.5G SGMII interface mode Date: Thu, 30 Nov 2017 16:50:50 +0100 Message-ID: <20171130155050.GD7483@lunn.ch> References: <1512016235-15909-1-git-send-email-Bhaskar.Upadhaya@nxp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org, davem@davemloft.net, linux-arm-kernel@lists.infradead.org To: Bhaskar Upadhaya Return-path: Received: from vps0.lunn.ch ([185.16.172.187]:41707 "EHLO vps0.lunn.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751811AbdK3Puy (ORCPT ); Thu, 30 Nov 2017 10:50:54 -0500 Content-Disposition: inline In-Reply-To: <1512016235-15909-1-git-send-email-Bhaskar.Upadhaya@nxp.com> Sender: netdev-owner@vger.kernel.org List-ID: On Thu, Nov 30, 2017 at 10:00:35AM +0530, Bhaskar Upadhaya wrote: > Add 2.5G SGMII interface mode(PHY_INTERFACE_MODE_2500SGMII) > in existing phy_interface list.As auto-negotiation is not > supported for 2.5G SGMII Hi Bhaskar I've been thinking about this some more... Is auto negotiation not supported in 2.5G SGMII in general, or just in the system you are using? Is it the PHY or the MAC which does not support it. Are we going to get into trouble if we find an 2.5G SGMII link which does negotiate? My understanding is that one of the main differences between SGMII and 1000BASE-X is the negotiation. Andrew