linux-kernel - Re: [PATCH net-next v2 1/2] dt-bindings: net: dsa: lantiq,gswip: add MaxLinear R(G)MII slew rate

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Message-ID: <20251219204324.GA3881969-robh@kernel.org>
Date: Fri, 19 Dec 2025 14:43:24 -0600
From: Rob Herring <robh@...nel.org>
To: "A. Sverdlin" <alexander.sverdlin@...mens.com>
Cc: netdev@...r.kernel.org, Hauke Mehrtens <hauke@...ke-m.de>,
	Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Daniel Golle <daniel@...rotopia.org>
Subject: Re: [PATCH net-next v2 1/2] dt-bindings: net: dsa: lantiq,gswip: add
 MaxLinear R(G)MII slew rate

On Tue, Dec 16, 2025 at 01:17:00PM +0100, A. Sverdlin wrote:
> From: Alexander Sverdlin <alexander.sverdlin@...mens.com>
> 
> Add new maxlinear,mii-slew-rate-slow boolean property. This property is
> only applicable for ports in R(G)MII mode and allows for slew rate
> reduction in comparison to "normal" default configuration with the purpose
> to reduce radiated emissions.
> 
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...mens.com>
> ---
> Changelog:
> v2:
> - unchanged
> 
>  Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> index 205b683849a53..6cd5c6152c9e9 100644
> --- a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> +++ b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> @@ -106,6 +106,11 @@ patternProperties:
>          unevaluatedProperties: false
>  
>          properties:
> +          maxlinear,mii-slew-rate-slow:

I would just reuse the pinctrl "slew-rate" property here. The values are 
binding specific.

> +            type: boolean
> +            description:
> +              Configure R(G)MII TXD/TXC pads' slew rate to "slow" instead
> +              of "normal" to reduce radiated emissions.
>            maxlinear,rmii-refclk-out:
>              type: boolean
>              description:
> -- 
> 2.52.0
>