linux-kernel - Re: [PATCH net-next 2/4] dt-bindings: net: renesas,rzv2h-gbeth: Document Renesas RZ/T2H and RZ/N2H SoCs

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Message-ID: <CA+V-a8sUgu9YgtnkCYEzGtfH=2dQCyj9Q7Wu1+WaKrDWy3vjiw@mail.gmail.com>
Date: Wed, 3 Sep 2025 10:56:19 +0100
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
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>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, 
	Russell King <linux@...linux.org.uk>, Giuseppe Cavallaro <peppe.cavallaro@...com>, 
	Jose Abreu <joabreu@...opsys.com>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Magnus Damm <magnus.damm@...il.com>, linux-renesas-soc@...r.kernel.org, 
	netdev@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, Biju Das <biju.das.jz@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH net-next 2/4] dt-bindings: net: renesas,rzv2h-gbeth:
 Document Renesas RZ/T2H and RZ/N2H SoCs

Hi Geert,

Thank you for the review.

On Wed, Sep 3, 2025 at 10:09 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> Thanks for your patch!
>
> On Tue, 2 Sept 2025 at 02:13, Prabhakar <prabhakar.csengg@...il.com> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Document the Ethernet MAC (GMAC) IP present on the Renesas RZ/T2H
> > (R9A09G077) and RZ/N2H (R9A09G087) SoCs. The GMAC IP on RZ/N2H is
> > identical to that found on the RZ/T2H SoC.
> >
> > While the RZ/V2H(P), RZ/T2H, and RZ/N2H SoCs all integrate the Synopsys
> > DesignWare MAC (version 5.20), the hardware is synthesized with different
> > options compared to the RZ/V2H(P):
> >   - RZ/T2H requires only 3 clocks instead of 7
> >   - RZ/T2H supports 8 RX/TX queue pairs instead of 4
> >   - RZ/T2H needs 2 reset controls with reset-names property, vs. a single
> >     unnamed reset
> >   - RZ/T2H has the split header feature enabled, while it is disabled on
> >     RZ/V2H(P)
> >
> > To accommodate these differences, introduce a new generic compatible
> > string `renesas,rzt2h-gbeth`, used as a fallback for both RZ/T2H and
> > RZ/N2H SoCs.
>
> Until now, we didn't have any family-specific "renesas,rzt2h-*"
> compatible values.  Instead, we always used " renesas,r9a09g077-<foo>"
> as a fallback for "renesas,r9a09g087-<foo>".
> Is there any good reason to start deviating from this?
>
Right, I missed that! I 'll switch back to the previous approach.

Cheers,
Prabhakar