linux-kernel - Re: [PATCH v5 03/12] dt-bindings: net: snps,dwmac: Add an optional resets single 'ahb'

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Date:   Wed, 8 Mar 2023 15:57:09 -0600
From:   Rob Herring <robh@...nel.org>
To:     Samin Guo <samin.guo@...rfivetech.com>
Cc:     linux-riscv@...ts.infradead.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        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>,
        Yanhong Wang <yanhong.wang@...rfivetech.com>
Subject: Re: [PATCH v5 03/12] dt-bindings: net: snps,dwmac: Add an optional
 resets single 'ahb'

On Fri, Mar 03, 2023 at 04:59:19PM +0800, Samin Guo wrote:
> According to:
> stmmac_platform.c: stmmac_probe_config_dt
> stmmac_main.c: stmmac_dvr_probe

That's not really a reason on its own. Maybe the driver is wrong. Do we 
know what hardware needs this?

> dwmac controller may require one (stmmaceth) or two (stmmaceth+ahb)
> reset signals, and the maxItems of resets/reset-names is going to be 2.
> 
> Signed-off-by: Samin Guo <samin.guo@...rfivetech.com>
> ---
>  .../devicetree/bindings/net/snps,dwmac.yaml        | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> index b4135d5297b4..89099a888f0b 100644
> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> @@ -133,12 +133,18 @@ properties:
>          - ptp_ref
>  
>    resets:
> -    maxItems: 1
> -    description:
> -      MAC Reset signal.
> +    minItems: 1
> +    items:
> +      - description: GMAC stmmaceth reset
> +      - description: AHB reset
>  
>    reset-names:
> -    const: stmmaceth
> +    minItems: 1
> +    maxItems: 2
> +    contains:

This means 'reset-names = "foo", "ahb";' is valid. You want 'items' 
instead. However, that still allows the below string in any order. Do we 
really need that? If not, then you want:

items:
  - const: stmmaceth
  - const: ahb

> +      enum:
> +        - stmmaceth
> +        - ahb
>  
>    power-domains:
>      maxItems: 1
> -- 
> 2.17.1
>