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

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Date: Fri, 15 Dec 2023 23:13:12 +0200
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: 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

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/