linux-kernel - Re: [PATCH net-next v2 4/5] net: stmmac: add support for RZ/N1 GMAC

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Date: Wed, 10 Apr 2024 14:25:18 +0200 (CEST)
From: Romain Gantois <romain.gantois@...tlin.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
cc: Romain Gantois <romain.gantois@...tlin.com>, 
    "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 <krzysztof.kozlowski+dt@...aro.org>, 
    Conor Dooley <conor+dt@...nel.org>, 
    Geert Uytterhoeven <geert+renesas@...der.be>, 
    Magnus Damm <magnus.damm@...il.com>, 
    Alexandre Torgue <alexandre.torgue@...s.st.com>, 
    Jose Abreu <joabreu@...opsys.com>, 
    Maxime Coquelin <mcoquelin.stm32@...il.com>, 
    Russell King <linux@...linux.org.uk>, 
    Clément Léger <clement.leger@...tlin.com>, 
    Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org, 
    devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
    linux-renesas-soc@...r.kernel.org, 
    linux-stm32@...md-mailman.stormreply.com, 
    linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v2 4/5] net: stmmac: add support for RZ/N1
 GMAC

Hi Geert,

On Tue, 9 Apr 2024, Geert Uytterhoeven wrote:

> > +config DWMAC_RZN1
> > +       tristate "Renesas RZ/N1 dwmac support"
> > +       default ARCH_RZN1
> 
> Why default to enabled?
> 
> > +       depends on OF && (ARCH_RZN1 || COMPILE_TEST)

The kernel doc states this as one of the possible cases where setting default 
y/m makes sense:

```
Sub-driver behavior or similar options for a driver that is “default n”. This 
allows you to provide sane defaults.
```

In the case of DWMAC_RZN1, it is a suboption of stmmac which is "default n", and 
I think it makes sense to enable the RZN1 ethernet controller driver if both the 
stmmac driver and the RZN1 architecture were explicitely selected.

Best Regards,

-- 
Romain Gantois, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com