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From:   Heiko =?ISO-8859-1?Q?St=FCbner?= <heiko@sntech.de>
To:     Jose Abreu <Jose.Abreu@synopsys.com>
Cc:     Katsuhiro Suzuki <katsuhiro@katsuster.net>,
        Giuseppe Cavallaro <peppe.cavallaro@st.com>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        Andrew Lunn <andrew@lunn.ch>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: stmmac regression on ASUS TinkerBoard
Date:   Tue, 25 Jun 2019 09:50:34 +0200
Message-ID: <4489696.oEgVQY3s1y@diego>
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Hi,

Am Dienstag, 25. Juni 2019, 09:46:12 CEST schrieb Jose Abreu:
> From: Katsuhiro Suzuki <katsuhiro@katsuster.net>
> 
> > I checked drivers/net/ethernet/stmicro/stmmac/stmmac_main.c and found
> > stmmac_init_phy() is going to fail if ethernet device node does not
> > have following property:
> >    - phy-handle
> >    - phy
> >    - phy-device
> > 
> > This commit broke the device-trees such as TinkerBoard. The mdio
> > subnode creating a mdio bus is changed to required or still optional?
> 
> Yeah, with PHYLINK the PHY binding is always required ...
> 
> How do you want to proceed ? I think DT bindings can never break between 
> releases so I will probably need to cook a patch for stmmac.

Correct ... old devicetrees on new kernels should not break.
Especially as this affects a big number of boards potentially loosing
network support and in the devicetree binding the phy property is also
marked as optional.

Heiko