From patchwork Thu Sep 9 08:49:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 509122 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 430B3C433F5 for ; Thu, 9 Sep 2021 08:50:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 29E8B61178 for ; Thu, 9 Sep 2021 08:50:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232380AbhIIIvN (ORCPT ); Thu, 9 Sep 2021 04:51:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53306 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231892AbhIIIvF (ORCPT ); Thu, 9 Sep 2021 04:51:05 -0400 Received: from albert.telenet-ops.be (albert.telenet-ops.be [IPv6:2a02:1800:110:4::f00:1a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 55490C061757 for ; Thu, 9 Sep 2021 01:49:56 -0700 (PDT) Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed20:7d44:646d:3ffb:9bbf]) by albert.telenet-ops.be with bizsmtp id rkpq2501H3eH4vN06kpqre; Thu, 09 Sep 2021 10:49:54 +0200 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1mOFkk-003Cqm-9d; Thu, 09 Sep 2021 10:49:50 +0200 Received: from geert by rox.of.borg with local (Exim 4.93) (envelope-from ) id 1mOFkj-00Aj4l-2S; Thu, 09 Sep 2021 10:49:49 +0200 From: Geert Uytterhoeven To: Magnus Damm Cc: Biju Das , Adam Ford , Florian Fainelli , Andrew Lunn , Heiner Kallweit , Russell King , Grygorii Strashko , linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH 0/9] renesas: Add compatible properties to Ethernet PHY nodes Date: Thu, 9 Sep 2021 10:49:36 +0200 Message-Id: X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hi all, If an Ethernet PHY reset is asserted when the Ethernet driver is initialized, the PHY cannot be probed: mdio_bus ee700000.ethernet-ffffffff: MDIO device at address 1 is missing This happens because the Linux PHY subsystem tries to read the PHY Identifier registers before handling PHY reset. Hence if the PHY reset was asserted before, identification fails. An easy way to reproduce this issue is by using kexec to launch a new kernel (the PHY reset will be asserted before starting the new kernel), or by unbinding and rebinding the Ethernet driver (the PHY reset will be asserted during unbind), e.g. on koelsch: echo ee700000.ethernet > /sys/bus/platform/drivers/sh-eth/unbind $ echo ee700000.ethernet > /sys/bus/platform/drivers/sh-eth/bind The recommended approach[1][2] seems to be working around this issue by adding compatible values to all ethernet-phy nodes, so Linux can identify the PHY at any time, without reading the PHY ID from the device, and regardless of the state of the PHY reset line. Hence this patch series adds such compatible values to all Ethernet PHY subnodes representing PHYs on all boards with Renesas ARM and ARM64 SoCs. For easier review, I have split the series in one patch per PHY model. On most boards, I could verify the actual PHY ID at runtime[3], on other boards I had to resort to schematics. Kexec and Ethernet driver rebind have been tested on Koelsch and Salvator-XS. I plan to queue these in renesas-devel for v5.16. Thanks for your comments! [1] "Re: [PATCH] RFC: net: phy: of phys probe/reset issue" https://lore.kernel.org/r/ade12434-adf2-6ea7-24ce-ce45ad2e1b5e@gmail.com/ [2] "PHY reset may still be asserted during MDIO probe" https://lore.kernel.org/r/CAMuHMdXno2OUHqsAfO0z43JmGkFehD+FJ2dEjEsr_P53oAAPxA@mail.gmail.com [3] The easiest way to obtain the PHY ID is by adding a debug print to drivers/net/phy/phy_device.c:get_phy_c22_id(), _before_ applying this patch. Geert Uytterhoeven (9): ARM: dts: renesas: Add compatible properties to KSZ8041 Ethernet PHYs ARM: dts: renesas: Add compatible properties to KSZ8081 Ethernet PHYs ARM: dts: renesas: Add compatible properties to KSZ9031 Ethernet PHYs iARM: dts: renesas: Add compatible properties to LAN8710A Ethernet PHYs ARM: dts: renesas: Add compatible properties to RTL8201FL Ethernet PHYs ARM: dts: renesas: Add compatible properties to uPD6061x Ethernet PHYs arm64: dts: renesas: Add compatible properties to AR8031 Ethernet PHYs arm64: dts: renesas: Add compatible properties to KSZ9031 Ethernet PHYs arm64: dts: renesas: Add compatible properties to RTL8211E Ethernet PHYs arch/arm/boot/dts/iwg20d-q7-common.dtsi | 2 ++ arch/arm/boot/dts/r7s72100-genmai.dts | 2 ++ arch/arm/boot/dts/r7s72100-gr-peach.dts | 2 ++ arch/arm/boot/dts/r7s72100-rskrza1.dts | 2 ++ arch/arm/boot/dts/r7s9210-rza2mevb.dts | 2 ++ arch/arm/boot/dts/r8a7740-armadillo800eva.dts | 2 ++ arch/arm/boot/dts/r8a7742-iwg21d-q7-dbcm-ca.dts | 2 ++ arch/arm/boot/dts/r8a7742-iwg21d-q7.dts | 2 ++ arch/arm/boot/dts/r8a7743-sk-rzg1m.dts | 2 ++ arch/arm/boot/dts/r8a7745-iwg22d-sodimm.dts | 2 ++ arch/arm/boot/dts/r8a7745-sk-rzg1e.dts | 2 ++ arch/arm/boot/dts/r8a77470-iwg23s-sbc.dts | 2 ++ arch/arm/boot/dts/r8a7790-lager.dts | 2 ++ arch/arm/boot/dts/r8a7790-stout.dts | 2 ++ arch/arm/boot/dts/r8a7791-koelsch.dts | 2 ++ arch/arm/boot/dts/r8a7791-porter.dts | 2 ++ arch/arm/boot/dts/r8a7793-gose.dts | 2 ++ arch/arm/boot/dts/r8a7794-alt.dts | 2 ++ arch/arm/boot/dts/r8a7794-silk.dts | 2 ++ arch/arm64/boot/dts/renesas/beacon-renesom-som.dtsi | 2 ++ arch/arm64/boot/dts/renesas/cat875.dtsi | 2 ++ arch/arm64/boot/dts/renesas/draak.dtsi | 2 ++ arch/arm64/boot/dts/renesas/ebisu.dtsi | 2 ++ arch/arm64/boot/dts/renesas/hihope-rzg2-ex.dtsi | 2 ++ arch/arm64/boot/dts/renesas/r8a77970-eagle.dts | 2 ++ arch/arm64/boot/dts/renesas/r8a77970-v3msk.dts | 2 ++ arch/arm64/boot/dts/renesas/r8a77980-condor.dts | 2 ++ arch/arm64/boot/dts/renesas/r8a77980-v3hsk.dts | 2 ++ arch/arm64/boot/dts/renesas/r8a779a0-falcon.dts | 2 ++ arch/arm64/boot/dts/renesas/salvator-common.dtsi | 2 ++ arch/arm64/boot/dts/renesas/ulcb.dtsi | 2 ++ 31 files changed, 62 insertions(+)