From mboxrd@z Thu Jan 1 00:00:00 1970 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=-23.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_IN_DEF_DKIM_WL 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 573E9C432BE for ; Mon, 23 Aug 2021 18:13:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3784E6124D for ; Mon, 23 Aug 2021 18:13:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230018AbhHWSO3 (ORCPT ); Mon, 23 Aug 2021 14:14:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229837AbhHWSO2 (ORCPT ); Mon, 23 Aug 2021 14:14:28 -0400 Received: from mail-yb1-xb31.google.com (mail-yb1-xb31.google.com [IPv6:2607:f8b0:4864:20::b31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 78A17C061575 for ; Mon, 23 Aug 2021 11:13:45 -0700 (PDT) Received: by mail-yb1-xb31.google.com with SMTP id z128so35758228ybc.10 for ; Mon, 23 Aug 2021 11:13:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=qcrJUn9SIsn9OtjuWFuCLDPINuV6hNlpD1UCcJXEpKA=; b=TXhX6kzROMX7aShYApBsIAaTL/0UNLI2yhyqlPz1I1AyHDfKPAGux7G0aKABOlIh6E 14COCM9PSN/nXqGZwo3uWS2B1FnmkpV9CA88m4ZYeuzvScQMZgXAvmvUhK2TlfwKMVPl Xv3Mn2AIJD4unJGAxw4Bf2bB7A02pZ0zmy0wJFmrHsgEgJj6TcwhYhZZZvq7eAmwq6uR jGFBxgtszxDNR6tP695CDgQgcowfRy2gr5Pq4F/6EToWr9BQlNx1M7iGQ9ggeq7z1dbg tVxgeP+2tWlztMPB7mprWN6vRK683goLVDdA0Xp4ZiRlEF1KpyFtmsLRwSA5dXVoYI7V FyCQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=qcrJUn9SIsn9OtjuWFuCLDPINuV6hNlpD1UCcJXEpKA=; b=bOPmRxldvds2gZJA3Y4IwwNv8XEuwwV7bYSS02Pru4qFzrWxScJnClWiu7RK/ifjXu ZgwHIuq49nbtGlVkeP3OT9C38P3d+0+KOWnnR+1FAp3Voc+OwUSZIy8DETr8x7la4tXh tlnQvRpf/fsuDFycFDApv6CdqNOjo5XwFSp57xDr8cjSSVeQF9tpS3X5c5dSjanffF/B BnJ7PHy1x3SwI2EId8Lto+RVufeFLyGRRq5vZhb4dnMTrJhUs+pDGjvnAllaLwna+se9 QFRnZZbXKm/agMydXWZ7XHAws7NKwGXimeOsx/GFXS8bLZvXpCZKWuZF6vCh79Tahzas jy6Q== X-Gm-Message-State: AOAM532fwXXAdDk7ACEE7cEUe2GXjWac3N6bFim5d2HGlkQT/5qmc6wH rKBYklDmIkMdkHhN6pRk6OXg39CDH9Y9pTrYrnQsdg== X-Google-Smtp-Source: ABdhPJzqw6BPhf6oRCv5BRo82ewq6xgec0g4rBKEuXqPvbalz4BrNgRFkSM+GKVVNHr1aceAGL/E82+5mc8jUR1HrVw= X-Received: by 2002:a25:b7c8:: with SMTP id u8mr44633182ybj.268.1629742424526; Mon, 23 Aug 2021 11:13:44 -0700 (PDT) MIME-Version: 1.0 References: <20210818021717.3268255-1-saravanak@google.com> <0a2c4106-7f48-2bb5-048e-8c001a7c3fda@samsung.com> In-Reply-To: From: Saravana Kannan Date: Mon, 23 Aug 2021 11:13:08 -0700 Message-ID: Subject: Re: [PATCH v2] of: property: fw_devlink: Add support for "phy-handle" property To: Andrew Lunn Cc: Marek Szyprowski , Rob Herring , Frank Rowand , netdev@vger.kernel.org, kernel-team@android.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Neil Armstrong , linux-amlogic@lists.infradead.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 23, 2021 at 6:16 AM Andrew Lunn wrote: > > On Mon, Aug 23, 2021 at 02:08:48PM +0200, Marek Szyprowski wrote: > > Hi, > > > > On 18.08.2021 04:17, Saravana Kannan wrote: > > > Allows tracking dependencies between Ethernet PHYs and their consumers. > > > > > > Cc: Andrew Lunn > > > Cc: netdev@vger.kernel.org > > > Signed-off-by: Saravana Kannan > > > > This patch landed recently in linux-next as commit cf4b94c8530d ("of: > > property: fw_devlink: Add support for "phy-handle" property"). It breaks > > ethernet operation on my Amlogic-based ARM64 boards: Odroid C4 > > (arm64/boot/dts/amlogic/meson-sm1-odroid-c4.dts) and N2 > > (meson-g12b-odroid-n2.dts) as well as Khadas VIM3/VIM3l > > (meson-g12b-a311d-khadas-vim3.dts and meson-sm1-khadas-vim3l.dts). > > > > In case of OdroidC4 I see the following entries in the > > /sys/kernel/debug/devices_deferred: > > > > ff64c000.mdio-multiplexer > > ff3f0000.ethernet > > > > Let me know if there is anything I can check to help debugging this issue. > > Hi Marek > > Please try this. Completetly untested, not even compile teseted: > > diff --git a/drivers/of/property.c b/drivers/of/property.c > index 0c0dc2e369c0..7c4e257c0a81 100644 > --- a/drivers/of/property.c > +++ b/drivers/of/property.c > @@ -1292,6 +1292,7 @@ DEFINE_SIMPLE_PROP(resets, "resets", "#reset-cells") > DEFINE_SIMPLE_PROP(leds, "leds", NULL) > DEFINE_SIMPLE_PROP(backlight, "backlight", NULL) > DEFINE_SIMPLE_PROP(phy_handle, "phy-handle", NULL) > +DEFINE_SIMPLE_PROP(mdio_parent_bus, "mdio-parent-bus", NULL); > DEFINE_SUFFIX_PROP(regulators, "-supply", NULL) > DEFINE_SUFFIX_PROP(gpio, "-gpio", "#gpio-cells") > > @@ -1381,6 +1382,7 @@ static const struct supplier_bindings of_supplier_bindings[] = { > { .parse_prop = parse_leds, }, > { .parse_prop = parse_backlight, }, > { .parse_prop = parse_phy_handle, }, > + { .parse_prop = parse_mdio_parent_bus, }, > { .parse_prop = parse_gpio_compat, }, > { .parse_prop = parse_interrupts, }, > { .parse_prop = parse_regulators, }, Looking at the code, I'm fairly certain that the device that corresponds to a DT node pointed to by mdio-parent-bus will be a "bus" device that's registered with the mdio_bus_class. If my understanding is right, then Nak for this patch. It'll break a lot of probes. TL;DR is that stateful/managed device links don't make sense for devices that are never probed/bound to a driver. I plan to improve device links to try and accommodate these cases nicely, but that's in my TO DO list. Until that's completed, this patch will break stuff. -Saravana