linux-kernel - Re: [PATCH net-next v3 2/3] dt-bindings: net: dsa: microchip: Add strap description to set SPI mode

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Message-ID: <175856174145.496533.6230819934968287513.robh@kernel.org>
Date: Mon, 22 Sep 2025 12:22:22 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: "Bastien Curutchet (Schneider Electric)" <bastien.curutchet@...tlin.com>
Cc: Paolo Abeni <pabeni@...hat.com>,
	Woojung Huh <Woojung.Huh@...rochip.com>, netdev@...r.kernel.org,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Marek Vasut <marex@...x.de>, Vladimir Oltean <olteanv@...il.com>,
	UNGLinuxDriver@...rochip.com,
	Woojung Huh <woojung.huh@...rochip.com>,
	Eric Dumazet <edumazet@...gle.com>, Andrew Lunn <andrew@...n.ch>,
	Miquèl Raynal <miquel.raynal@...tlin.com>,
	Pascal Eberhard <pascal.eberhard@...com>,
	linux-kernel@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next v3 2/3] dt-bindings: net: dsa: microchip: Add
 strap description to set SPI mode


On Thu, 18 Sep 2025 10:33:51 +0200, Bastien Curutchet (Schneider Electric) wrote:
> At reset, KSZ8463 uses a strap-based configuration to set SPI as
> interface bus. If the required pull-ups/pull-downs are missing (by
> mistake or by design to save power) the pins may float and the
> configuration can go wrong preventing any communication with the switch.
> 
> Add a 'reset' pinmux state
> Add a KSZ8463 specific strap description that can be used by the driver
> to drive the strap pins during reset. Two GPIOs are used. Users must
> describe either both of them or none of them.
> 
> Signed-off-by: Bastien Curutchet (Schneider Electric) <bastien.curutchet@...tlin.com>
> ---
>  .../devicetree/bindings/net/dsa/microchip,ksz.yaml    | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>