netdev - 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: <CAMuHMdU_BHtHznN8C7s0Yf=nxBaXb94MLFD-Pcz73W8hJhxc-w@mail.gmail.com>
Date: Wed, 3 Sep 2025 11:09:21 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Prabhakar <prabhakar.csengg@...il.com>
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 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?

> The DT schema is updated to validate the clocks, resets, reset-names,
> interrupts, and interrupt-names properties accordingly. Also extend
> `snps,dwmac.yaml` with the new `renesas,rzt2h-gbeth` compatible.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds