netdev - Re: [PATCH net-next v4 1/2] dt-bindings: net: dsa: lantiq,gswip: add MaxLinear R(G)MII slew rate

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Message-ID: <CAL_JsqJyCPnSMeJ9y_qQcAgVqU6YtoXXKWB6h4REyJkrxoG73g@mail.gmail.com>
Date: Tue, 13 Jan 2026 20:04:55 -0600
From: Rob Herring <robh@...nel.org>
To: Daniel Golle <daniel@...rotopia.org>
Cc: "A. Sverdlin" <alexander.sverdlin@...mens.com>, 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
Subject: Re: [PATCH net-next v4 1/2] dt-bindings: net: dsa: lantiq,gswip: add
 MaxLinear R(G)MII slew rate

On Tue, Jan 13, 2026 at 10:59 AM Daniel Golle <daniel@...rotopia.org> wrote:
>
> On Tue, Jan 13, 2026 at 10:41:28AM -0600, Rob Herring wrote:
> > On Wed, Jan 07, 2026 at 10:00:16AM +0100, A. Sverdlin wrote:
> > > From: Alexander Sverdlin <alexander.sverdlin@...mens.com>
> > >
> > > Add new maxlinear,slew-rate-txc and maxlinear,slew-rate-txd uint32
> > > properties. The properties are only applicable for ports in R(G)MII mode
> > > and allow 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:
> > > v4:
> > > - separate properties for TXD and TXC pads ("maxlinear," prefix re-appears)
> > > v3:
> > > - use [pinctrl] standard "slew-rate" property as suggested by Rob
> > >   https://lore.kernel.org/all/20251219204324.GA3881969-robh@kernel.org/
> > > v2:
> > > - unchanged
> > >
> > >  .../devicetree/bindings/net/dsa/lantiq,gswip.yaml  | 14 ++++++++++++++
> > >  1 file changed, 14 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> > > index 205b683849a53..747106810cc17 100644
> > > --- a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> > > +++ b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> > > @@ -106,6 +106,20 @@ patternProperties:
> > >          unevaluatedProperties: false
> > >
> > >          properties:
> > > +          maxlinear,slew-rate-txc:
> > > +            $ref: /schemas/types.yaml#/definitions/uint32
> > > +            enum: [0, 1]
> >
> > default: 0
>
> Not really. The default is not to touch the register value which may
> have already been setup by the bootloader.

Okay, please add that to the description.

Rob