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From:   Rob Herring <robh+dt@kernel.org>
Date:   Mon, 23 Aug 2021 07:42:08 -0500
Message-ID: <CAL_JsqJ50mU2OfHs5eJmgn_8YnJsAsQXzGrzr4_3LQFb6336hg@mail.gmail.com>
Subject: Re: [PATCH v2] of: property: fw_devlink: Add support for "phy-handle" property
To:     Marek Szyprowski <m.szyprowski@samsung.com>
Cc:     Saravana Kannan <saravanak@google.com>,
        Frank Rowand <frowand.list@gmail.com>,
        Andrew Lunn <andrew@lunn.ch>, netdev <netdev@vger.kernel.org>,
        Android Kernel Team <kernel-team@android.com>,
        devicetree@vger.kernel.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Neil Armstrong <narmstrong@baylibre.com>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@lists.infradead.org>
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On Mon, Aug 23, 2021 at 7:08 AM Marek Szyprowski
<m.szyprowski@samsung.com> wrote:
>
> Hi,
>
> On 18.08.2021 04:17, Saravana Kannan wrote:
> > Allows tracking dependencies between Ethernet PHYs and their consumers.
> >
> > Cc: Andrew Lunn <andrew@lunn.ch>
> > Cc: netdev@vger.kernel.org
> > Signed-off-by: Saravana Kannan <saravanak@google.com>
>
> 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.

Looks to me like we need to handle 'mdio-parent-bus' dependency.

Rob