Re: [PATCH net-next v5 06/12] dt-bindings: net: dsa: lantiq,gswip: add support for MII delay properties

From: Rob Herring

Date: Thu Oct 30 2025 - 20:37:06 EST


On Thu, Oct 30, 2025 at 07:29:24PM -0500, Rob Herring wrote:
> On Thu, Oct 30, 2025 at 11:28:35AM +0000, Daniel Golle wrote:
> > Add support for standard tx-internal-delay-ps and rx-internal-delay-ps
> > properties on port nodes to allow fine-tuning of RGMII clock delays.
> >
> > The GSWIP switch hardware supports delay values in 500 picosecond
> > increments from 0 to 3500 picoseconds, with a post-reset default of 2000
> > picoseconds for both TX and RX delays. The driver currently sets the
> > delay to 0 in case the PHY is setup to carry out the delay by the
> > corresponding interface modes ("rgmii-id", "rgmii-rxid", "rgmii-txid").
> >
> > This corresponds to the driver changes that allow adjusting MII delays
> > using Device Tree properties instead of relying solely on the PHY
> > interface mode.
> >
> > Signed-off-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
> > ---
> > v4:
> > * remove misleading defaults
> >
> > v3:
> > * redefine ports node so properties are defined actually apply
> > * RGMII port with 2ps delay is 'rgmii-id' mode
> >
> > .../bindings/net/dsa/lantiq,gswip.yaml | 31 +++++++++++++++++--
> > 1 file changed, 28 insertions(+), 3 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> > index f3154b19af78..8ccbc8942eb3 100644
> > --- a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> > +++ b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> > @@ -6,8 +6,31 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
> >
> > title: Lantiq GSWIP Ethernet switches
> >
> > -allOf:
> > - - $ref: dsa.yaml#/$defs/ethernet-ports
>
> I think you can keep this as you aren't adding custom properties.

Nevermind, I see the next patch now...