# Re: \[PATCH v2 2/3\] dt-bindings: net: meson-dwmac: add T7 support

- From: Lucas Tanure \<hidden\>
- Date: 2026-10-04 14:06:46 
- List: netdev
- Page: https://ratatoskr.run/netdev/2026/10/17690551
- Thread: https://ratatoskr.run/linux-spi/2026/09/17633833/t.md

```text
On 24/09/2026 18:21, Conor Dooley wrote:
> On Thu, Sep 24, 2026 at 05:51:09AM +0000, Xianwei Zhao via B4 Relay wrote:
>> From: Xianwei Zhao <xianwei.zhao@amlogic.com>
>>
>> Add the T7 compatible to the Meson DWMAC binding.
>>
>> The T7 DWMAC controller requires the following compatible combination:
>>
>> amlogic,t7-dwmac
>> amlogic,meson-axg-dwmac
>> snps,dwmac-4.00
>>
>> Add a conditional schema check to enforce this compatible combination
>> when amlogic,t7-dwmac is used.
>>
>> Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
>> ---
>>   .../devicetree/bindings/net/amlogic,meson-dwmac.yaml    | 17 +++++++++++++++++
>>   1 file changed, 17 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
>> index 5c91716d1f21..b529ca5577a9 100644
>> --- a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
>> +++ b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
>> @@ -23,11 +23,24 @@ select:
>>             - amlogic,meson-gxbb-dwmac
>>             - amlogic,meson-axg-dwmac
>>             - amlogic,meson-g12a-dwmac
>> +          - amlogic,t7-dwmac
>>     required:
>>       - compatible
>>   
>>   allOf:
>>     - $ref: snps,dwmac.yaml#
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            const: amlogic,t7-dwmac
>> +    then:
>> +      properties:
>> +        compatible:
>> +          items:
>> +            - const: amlogic,t7-dwmac
>> +            - const: amlogic,meson-axg-dwmac
>> +            - const: snps,dwmac-4.00
>
> This is not how fallback compatibles are described.
>
> Instead of doing this, which affects all other compatibles in the file
> by allowing dwmac-4.00 for all devices, please do this the normal way.
> dwmac isn't special, it's just this binding that's weird!
> Can whats currently in the binding (before this patch) be largely
> replaced by just doing:
>    compatible:
>      oneOf:
>        - items:
>            - enum:
>                - amlogic,meson8b-dwmac
>                - amlogic,meson-gxbb-dwmac
>                - amlogic,meson-axg-dwmac
>                - amlogic,meson-g12a-dwmac
>            - const: snps,dwmac-3.70a
>            - const: snps,dwmac
>        - items:
>            - enum:
>                - amlogic,meson6-dwmac
>                - amlogic,meson8m2-dwmac
>            - const: snps,dwmac
>
> You'll have to check this yourself against the amlogic devicetrees and
> see if this is correct, but with this you should be able to add your new
> device without doing anything special.

I have the same patch in my T7 work and checked it against the amlogic device trees: meson6 and meson8m2 use the two entry form, the rest add snps,dwmac-3.70a. dt_binding_check and dtbs_check are clean. The example needs fixing.

Xianwei, from my VIM4: the MAC reports Synopsys ID 0x51, DWMAC_CORE_5_10
in common.h, so the core is 5.10a, not 4.00. And the controller reaches
DRAM through a pipeline stage. Nothing claims its gate, sys_ampipe_eth,
so clk_disable_unused switches it off. My node lists it as a fourth
clock. Does the AN400 differ?

I will send my series today so the code is on the list. Not a race: I
will drop or rebase whatever overlaps once you tell me.

Thanks,
Lucas

>
> pw-bot: changes-requested
>
> Thanks,
> Conor.
>
>>     - if:
>>         properties:
>>           compatible:
>> @@ -38,6 +51,7 @@ allOf:
>>                 - amlogic,meson-gxbb-dwmac
>>                 - amlogic,meson-axg-dwmac
>>                 - amlogic,meson-g12a-dwmac
>> +              - amlogic,t7-dwmac
>>   
>>       then:
>>         properties:
>> @@ -93,6 +107,7 @@ allOf:
>>                 - amlogic,meson8m2-dwmac
>>                 - amlogic,meson-gxbb-dwmac
>>                 - amlogic,meson-axg-dwmac
>> +              - amlogic,t7-dwmac
>>       then:
>>         properties:
>>           rx-internal-delay-ps:
>> @@ -139,8 +154,10 @@ properties:
>>             - amlogic,meson-gxbb-dwmac
>>             - amlogic,meson-axg-dwmac
>>             - amlogic,meson-g12a-dwmac
>> +          - amlogic,t7-dwmac
>>       contains:
>>         enum:
>> +        - snps,dwmac-4.00
>>           - snps,dwmac-3.70a
>>           - snps,dwmac
>>   
>>
>> -- 
>> 2.52.0
>>
>>
```