linux-kernel - Re: [PATCH v4 11/11] ARM: multi_v7_defconfig: Add MCP23S08 pinctrl support

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Date: Tue, 4 Jun 2024 18:55:00 +0200
From: Marek Vasut <marex@...x.de>
To: Christophe Roullier <christophe.roullier@...s.st.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>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Richard Cochran <richardcochran@...il.com>, Jose Abreu
 <joabreu@...opsys.com>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 11/11] ARM: multi_v7_defconfig: Add MCP23S08 pinctrl
 support

On 6/4/24 4:35 PM, Christophe Roullier wrote:
> Need to enable MCP23S08 I/O expanders to manage Ethernet PHY
> reset in STM32MP135F-DK board.
> Put this config in built-in like STMMAC to avoid huge of Ethernet
> messages during boot (deferred)

You're not avoiding any error/defer/messages here, you simply need to 
enable the MCP23S08 GPIO controller driver, so the kernel can use the 
GPIO provided by that driver instance to release the ethernet PHY from 
reset on STM32MP135F-DK, that's all.