netdev - Re: [PATCH net-next 1/5] arm64: dts: ls1043a-qds: switch to new fixed-link binding

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Message-ID: <a5411ede-5312-4510-a559-e3b09e7e763b@gmail.com>
Date: Mon, 1 Sep 2025 21:39:44 +0200
From: Heiner Kallweit <hkallweit1@...il.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>
Cc: Shawn Guo <shawnguo@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Patrice Chotard <patrice.chotard@...s.st.com>, Andrew Lunn <andrew@...n.ch>,
 Andrew Lunn <andrew+netdev@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>,
 David Miller <davem@...emloft.net>,
 "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 1/5] arm64: dts: ls1043a-qds: switch to new
 fixed-link binding

On 8/30/2025 11:27 PM, Russell King (Oracle) wrote:
> On Sat, Aug 30, 2025 at 12:27:23PM +0200, Heiner Kallweit wrote:
>> The old array-type fixed-link binding has been deprecated
>> for more than 10 yrs. Switch to the new binding.
> 
> ... and the fact we have device trees that use it today means that we
> can't remove support for it from the kernel.
> 
> I think it would make sense to update the dts files, and add a noisy
> warning when we detect that it's being used to prevent future usage.
> 
Usage of the deprecated binding was added to this dt file with ab9d8032dbd0
("arm64: dts: ls1043a-qds: add mmio based mdio-mux support") in 2022.
At that time the binding had been marked deprecated for years already.
I think it would be good if dtc would warn already if a deprecated
binding is detected, so that CI can complain.