netdev - Re: [PATCH v3 2/7] dt-bindings: net: snps,dwmac: Update the maxitems number of resets and reset-names

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Message-ID: <2328562d-59a2-f60e-b17b-6cf16392e01f@linaro.org>
Date:   Fri, 6 Jan 2023 13:44:56 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Yanhong Wang <yanhong.wang@...rfivetech.com>,
        linux-riscv@...ts.infradead.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Richard Cochran <richardcochran@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Peter Geis <pgwipeout@...il.com>
Subject: Re: [PATCH v3 2/7] dt-bindings: net: snps,dwmac: Update the maxitems
 number of resets and reset-names

On 06/01/2023 03:59, Yanhong Wang wrote:
> Some boards(such as StarFive VisionFive v2) require more than one value
> which defined by resets property, so the original definition can not
> meet the requirements. In order to adapt to different requirements,
> adjust the maxitems number definition.
> 
> Signed-off-by: Yanhong Wang <yanhong.wang@...rfivetech.com>
> ---
>  .../devicetree/bindings/net/snps,dwmac.yaml   | 36 ++++++++++++++-----
>  1 file changed, 28 insertions(+), 8 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> index e26c3e76ebb7..f7693e8c8d6d 100644
> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> @@ -132,14 +132,6 @@ properties:
>          - pclk
>          - ptp_ref
>  
> -  resets:
> -    maxItems: 1
> -    description:
> -      MAC Reset signal.
> -
> -  reset-names:
> -    const: stmmaceth
> -
>    power-domains:
>      maxItems: 1
>  
> @@ -463,6 +455,34 @@ allOf:
>              Enables the TSO feature otherwise it will be managed by
>              MAC HW capability register.
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: starfive,jh7110-dwmac
> +

Looking at your next binding patch, this seems a bit clearer. First of
all, this patch on itself has little sense. It's not usable on its own,
because you need the next one.

Probably the snps,dwmac should be just split into common parts used by
devices. It makes code much less readable and unnecessary complicated to
support in one schema both devices and re-usability.

Otherwise I propose to make the resets/reset-names just like clocks are
made: define here wide constraints and update all other users of this
binding to explicitly restrict resets.


Best regards,
Krzysztof