[RFC PATCH v2 3/7] dt-bindings: net: amlogic,meson-dwmac: add amlogic,t7-dwmac

[Lucas Tanure]

On Wed, Oct 7, 2026 at 10:51 AM Conor Dooley <conor at kernel.org> wrote:
>
> On Wed, Oct 07, 2026 at 09:26:23AM +0100, Lucas Tanure wrote:
> > The T7 has the same ethernet glue as the G12A, but the controller
> > reaches memory through a pipeline stage that this SoC inserts in the
> > bus path. That stage has a gate of its own, which no other member of
> > the family has, and nothing else in Linux claims it. It is therefore
> > switched off as unused, and the port can then no longer finish a
> > transfer.
> >
> > Describing it needs a fourth clock, and the fourth clock of the
> > existing list drives the timing adjustment logic, which the T7 never
> > uses. So the T7 gets a list of its own with the gate in that place,
> > under the name the SD and eMMC controllers already use.
> >
> > Assisted-by: LLM
> > Signed-off-by: Lucas Tanure <tanure at linux.com>
>
> Didn't I ack the previous version?
Sorry, I didn't receive one.
>
> What changed?
Nothing.
>
> Thanks,
> Conor.
>
> > ---
> >  .../bindings/net/amlogic,meson-dwmac.yaml     | 47 +++++++++++++++++++
> >  1 file changed, 47 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
> > index 90ef79161ab1..96118b4d1560 100644
> > --- a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
> > +++ b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
> > @@ -23,6 +23,7 @@ select:
> >            - amlogic,meson-gxbb-dwmac
> >            - amlogic,meson-axg-dwmac
> >            - amlogic,meson-g12a-dwmac
> > +          - amlogic,t7-dwmac
> >    required:
> >      - compatible
> >
> > @@ -57,6 +58,47 @@ allOf:
> >              - const: clkin1
> >              - const: timing-adjustment
> >
> > +  # The T7 applies the RGMII RX delay through PRG_ETH1 and never enables the
> > +  # timing adjustment logic, so it has no timing-adjustment clock. What it does
> > +  # need is the gate of the pipeline stage the controller reaches DRAM through.
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: amlogic,t7-dwmac
> > +    then:
> > +      properties:
> > +        clocks:
> > +          items:
> > +            - description: GMAC main clock
> > +            - description: First parent clock of the internal mux
> > +            - description: Second parent clock of the internal mux
> > +            - description:
> > +                clock of the pipeline stage inserted in the bus path between
> > +                the controller and the DRAM. Without it, the controller cannot
> > +                complete DMA transfers.
> > +
> > +        clock-names:
> > +          items:
> > +            - const: stmmaceth
> > +            - const: clkin0
> > +            - const: clkin1
> > +            - const: pipeline
> > +
> > +  # Delay definitions for Meson8b and newer (including T7)
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - amlogic,meson8b-dwmac
> > +              - amlogic,meson8m2-dwmac
> > +              - amlogic,meson-gxbb-dwmac
> > +              - amlogic,meson-axg-dwmac
> > +              - amlogic,meson-g12a-dwmac
> > +              - amlogic,t7-dwmac
> > +    then:
> > +      properties:
> >          amlogic,tx-delay-ns:
> >            enum: [0, 2, 4, 6]
> >            default: 2
> > @@ -106,6 +148,7 @@ allOf:
> >            contains:
> >              enum:
> >                - amlogic,meson-g12a-dwmac
> > +              - amlogic,t7-dwmac
> >      then:
> >        properties:
> >          rx-internal-delay-ps:
> > @@ -143,6 +186,10 @@ properties:
> >                - amlogic,meson6-dwmac
> >                - amlogic,meson8m2-dwmac
> >            - const: snps,dwmac
> > +      - items:
> > +          - const: amlogic,t7-dwmac
> > +          - const: snps,dwmac-5.10a
> > +          - const: snps,dwmac
> >
> >    reg:
> >      items:
> > --
> > 2.56.0
> >