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

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Message-ID: <CAMuHMdX-JwWQfU_hOXY5d_YEzGkyEV-VzFYhrCBFhYtTGEOh1Q@mail.gmail.com>
Date: Thu, 6 Mar 2025 14:11:21 +0100
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>, 
	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 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).

> +       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.

> +       "rx", "rx-180", "tx-180",
> +};

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