linux-kernel - Re: [PATCH 3/3] net: stmmac: Add DWMAC glue layer for Renesas GBETH

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Message-ID: <CA+V-a8u8KUgv0xOW9Nf=GFVHw8SibsWjx+ZUZ0Vfq5kjdsMAjw@mail.gmail.com>
Date: Sat, 8 Mar 2025 12:44:10 +0000
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>, 
	Philipp Zabel <p.zabel@...gutronix.de>, 
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>, Giuseppe Cavallaro <peppe.cavallaro@...com>, 
	Jose Abreu <joabreu@...opsys.com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, 
	netdev@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.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 3/3] net: stmmac: Add DWMAC glue layer for Renesas GBETH

Hi Geert,

Thank you for the review.

On Thu, Mar 6, 2025 at 1:11 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Sun, 2 Mar 2025 at 19:18, Prabhakar <prabhakar.csengg@...il.com> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Renesas RZ/V2H(P) SoC is equipped with Synopsys DesignWare Ethernet
> > Quality-of-Service IP block version 5.20. This commit adds DWMAC glue
> > layer for the Renesas GBETH found on the RZ/V2H(P) SoC.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Thanks for your patch!
>
> A few early comments...
>
> > --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> > +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> > @@ -131,6 +131,17 @@ config DWMAC_QCOM_ETHQOS
> >           This selects the Qualcomm ETHQOS glue layer support for the
> >           stmmac device driver.
> >
> > +config DWMAC_RENESAS_GBETH
> > +       tristate "Renesas RZ/V2H(P) GBETH support"
> > +       default ARCH_RENESAS
>
> This auto-enables DWMAC_RENESAS_GBETH when building a kernel for e.g
> RZ/N1D, which uses stmmac with DWMAC_RZN1.  So I'll have to disable
> this explicitly in shmobile_defconfig.  This is not a big issue,
> we already have similar constructs (DRM_RCAR_USE_MIPI_DSI defaults to
> DRM_RCAR_DU, but is not used on R-Car Gen1/2).
>
I added this based on the recent comments received while add WDT
support for RZ/G3E.

> > +       depends on OF && (ARCH_RENESAS || COMPILE_TEST)
> > +       help
> > +         Support for Gigabit Ethernet Interface (GBETH) on Renesas
> > +         RZ/V2H(P) SoCs.
> > +
> > +         This selects the Renesas RZ/V2H(P) Soc specific glue layer support
> > +         for the stmmac device driver.
> > +
> >  config DWMAC_ROCKCHIP
> >         tristate "Rockchip dwmac support"
> >         default ARCH_ROCKCHIP
>
> > --- /dev/null
> > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
>
> > +static const char *const renesas_gbeth_clks[] __initconst = {
>
> WARNING: modpost: vmlinux: section mismatch in reference:
> renesas_gbeth_probe+0x1e0 (section: .text) -> renesas_gbeth_clks
> (section: .init.rodata)
>
> Please drop the __initconst.
>
Ok, I will drop that.

Cheers,
Prabhakar