linux-kernel - Re: [PATCH v2 resend] net: stmmac: add support for dwmac 5.20

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Message-ID: <aR3p4NBK-AnCGK6a@xhacker>
Date: Thu, 20 Nov 2025 00:01:36 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 resend] net: stmmac: add support for dwmac 5.20

On Wed, Nov 19, 2025 at 04:13:17PM +0000, Russell King (Oracle) wrote:
> On Wed, Nov 19, 2025 at 11:35:26PM +0800, Jisheng Zhang wrote:
> > The dwmac 5.20 IP can be found on some synaptics SoCs. 
> > 
> > The binding doc has been already upstreamed by
> > commit 13f9351180aa ("dt-bindings: net: snps,dwmac: Add dwmac-5.20
> > version")
> > 
> > So we just need to add a compatibility flag in dwmac generic driver.
> 
> Do we _need_ to add it to the generic driver? Do the platforms that are
> using this really not need any additional code to support them?
> 
> Looking at all the DT that mention dwmac-5.20 in their compatible
> strings, that is always after other compatibles that point to other
> platform specific drivers.
> 
> So, can you point to a platform that doesn't have its own platform
> glue, and would be functional when using the dwmac-generic driver?

Synatpics platforms use the dwmac-generic driver, it's enough now.
But we haven't upstreamed related platforms, but will do soon.
> 
> For reference, the dts that refer to dwmac-5.20 are:
> 
> arch/arm64/boot/dts/renesas/r9a09g047.dtsi
> arch/arm64/boot/dts/renesas/r9a09g056.dtsi
> arch/arm64/boot/dts/renesas/r9a09g057.dtsi
> arch/arm64/boot/dts/st/stm32mp251.dtsi
> arch/arm64/boot/dts/st/stm32mp253.dtsi
> arch/arm64/boot/dts/st/stm32mp233.dtsi
> arch/arm64/boot/dts/st/stm32mp231.dtsi
> arch/riscv/boot/dts/starfive/jh7110.dtsi
> 
> Thanks.
> 
> -- 
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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