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Date: Tue, 28 Jul 2026 19:12:05 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Maxime Chevallier <maxime.chevallier@bootlin.com>
Cc: Zxyan Zhu <zxyan0222@gmail.com>, netdev@vger.kernel.org, Andrew Lunn
 <andrew+netdev@lunn.ch>, "David S . Miller" <davem@davemloft.net>, Eric
 Dumazet <edumazet@google.com>, Paolo Abeni <pabeni@redhat.com>, Maxime
 Coquelin <mcoquelin.stm32@gmail.com>, Alexandre Torgue
 <alexandre.torgue@foss.st.com>, Russell King <linux@armlinux.org.uk>,
 Russell King <rmk+kernel@armlinux.org.uk>, Serge Semin
 <fancer.lancer@gmail.com>, Romain Gantois <romain.gantois@bootlin.com>,
 Hariprasad Kelam <hkelam@marvell.com>,
 linux-stm32@st-md-mailman.stormreply.com,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next v2 0/2] net: stmmac: Fix PHY attach when custom
 PCS is in use
Message-ID: <20260728191205.53e347c0@kernel.org>
In-Reply-To: <f14a1712-8315-4e64-b23b-ac00d7f82c3a@bootlin.com>
References: <20260726132618.3580612-1-zxyan0222@gmail.com>
	<f14a1712-8315-4e64-b23b-ac00d7f82c3a@bootlin.com>
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On Mon, 27 Jul 2026 08:49:11 +0200 Maxime Chevallier wrote:
> On 7/26/26 15:26, Zxyan Zhu wrote:
> > This series fixes the issue where stmmac platforms using a custom PCS
> > via the pcs_init callback fail to probe when no phy-handle is specified
> > in the device tree.
> > 
> > Patch 1 is Russell King's phylink patch that relaxes phylink_expects_phy()
> > to allow PHYs to be attached in 802.3z inband mode.
> > 
> > Patch 2 skips the PHY attach in stmmac when a custom PCS is already
> > configured via priv->hw->phylink_pcs, avoiding the "no phy found" error
> > for platforms that manage link state entirely through the PCS.  
> 
> I've tested this series on the board that saw the regression from Russell's
> first attempt, and now with the associated stmmac patch, it works :)

Both Sashikos see a risk of regression here, could you TAL and confirm
it's not real / unlikely?