From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752777AbdDHNzz (ORCPT ); Sat, 8 Apr 2017 09:55:55 -0400 Received: from shards.monkeyblade.net ([184.105.139.130]:37342 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751646AbdDHNzt (ORCPT ); Sat, 8 Apr 2017 09:55:49 -0400 Date: Sat, 08 Apr 2017 06:55:45 -0700 (PDT) Message-Id: <20170408.065545.2057882592764132853.davem@davemloft.net> To: rogerq@ti.com Cc: tony@atomide.com, nsekhar@ti.com, jsarha@ti.com, netdev@vger.kernel.org, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] net: davinci_mdio: add GPIO reset logic From: David Miller In-Reply-To: <1491381237-24635-1-git-send-email-rogerq@ti.com> References: <1491381237-24635-1-git-send-email-rogerq@ti.com> X-Mailer: Mew version 6.7 on Emacs 25.1 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Sat, 08 Apr 2017 06:14:30 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Roger Quadros Date: Wed, 5 Apr 2017 11:33:57 +0300 > Some boards [1] leave the PHYs at an invalid state > during system power-up or reset thus causing unreliability > issues with the PHY like not being detected by the mdio bus > or link not functional. To work around these boards have > a GPIO connected to the PHY's reset pin. > > Implement GPIO reset handling for such cases. > > [1] - am572x-idk, am571x-idk, a437x-idk. > > Signed-off-by: Roger Quadros > Signed-off-by: Sekhar Nori I have not seen a resolution in this discussion. My understanding is that there are several cases (single MDIO bus whose reset does a reset on all that MDIO bus's PHYs, etc.) and it's unclear how to handle all such cases cleanly.