netdev - Re: [PATCH v2 12/12] [UNTESTED] riscv: dts: starfive: beaglev-starlight: Enable gmac

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Date: Sat, 16 Dec 2023 11:24:40 -0800
From: Emil Renner Berthing <emil.renner.berthing@...onical.com>
To: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>, 
	Emil Renner Berthing <emil.renner.berthing@...onical.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+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Emil Renner Berthing <kernel@...il.dk>, Samin Guo <samin.guo@...rfivetech.com>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Torgue <alexandre.torgue@...s.st.com>, 
	Jose Abreu <joabreu@...opsys.com>, Maxime Coquelin <mcoquelin.stm32@...il.com>, 
	Richard Cochran <richardcochran@...il.com>, Giuseppe Cavallaro <peppe.cavallaro@...com>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v2 12/12] [UNTESTED] riscv: dts: starfive:
 beaglev-starlight: Enable gmac

Cristian Ciocaltea wrote:
> On 11/28/23 02:40, Cristian Ciocaltea wrote:
> > On 11/26/23 23:10, Emil Renner Berthing wrote:
> >> Cristian Ciocaltea wrote:
> >>> The BeagleV Starlight SBC uses a Microchip KSZ9031RNXCA PHY supporting
> >>> RGMII-ID.
> >>>
>
> [...]
>
> >> You've alse removed the phy reset gpio on the Starlight board:
> >>
> >>   snps,reset-gpios = <&gpio 63 GPIO_ACTIVE_LOW>
> >>
> >> Why?
> >
> > I missed this in v1 as the gmac handling was done exclusively in
> > jh7100-common. Thanks for noticing!
>
> Hi Emil,
>
> I think the reset doesn't actually trigger because "snps,reset-gpios" is
> not a valid property, it should have been "snps,reset-gpio" (without the
> trailing "s").
>
> However, this seems to be deprecated now, and the recommended approach
> would be to define the reset gpio in the phy node, which I did in [1].
>
> Hopefully this won't cause any unexpected behaviour. Otherwise we should
> probably simply drop it.
>
> [1]: https://lore.kernel.org/lkml/20231215204050.2296404-8-cristian.ciocaltea@collabora.com/

Oh, nice catch! With your v3 patches the Starlight board still works fine and
GPIO63 is correctly grabbed and used for "PHY reset".

/Emil