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Received: from andrew by vps0.lunn.ch with local (Exim 4.89) (envelope-from ) id 1hs6p9-0001pS-To; Mon, 29 Jul 2019 16:40:27 +0200 Date: Mon, 29 Jul 2019 16:40:27 +0200 From: Andrew Lunn To: Simon Horman Subject: Re: [PATCH v2] arm64: dts: renesas: ebisu, draak: Limit EtherAVB to 100Mbps Message-ID: <20190729144027.GD4110@lunn.ch> References: <20190729080356.13023-1-horms+renesas@verge.net.au> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190729080356.13023-1-horms+renesas@verge.net.au> User-Agent: Mutt/1.5.23 (2014-03-12) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190729_074038_619211_5301D67B X-CRM114-Status: GOOD ( 10.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Geert Uytterhoeven , Wolfram Sang , Magnus Damm , linux-renesas-soc@vger.kernel.org, Kieran Bingham , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Jul 29, 2019 at 10:03:56AM +0200, Simon Horman wrote: > * According to the R-Car Gen3 Hardware Manual Errata for Rev 1.00 of > August 24, 2018, the TX clock internal delay mode isn't supported > on R-Car E3 (r8a77990) and D3 (r8a77995). > > * TX clock internal delay mode is required for reliable 1Gbps communication > using the KSZ9031RNX phy present on the Ebisu and Draak boards. > > Thus, the E3 based Ebisu and D3 based Draak boards can not reliably > use 1Gbps and the speed should be limited to 100Mbps. > > Based on work by Kazuya Mizuguchi. > > Signed-off-by: Simon Horman Reviewed-by: Andrew Lunn Andrew _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel