netdev - Re: [PATCH 1/1] dt-bindings: net: snps,dwmac: Document queue config subnodes

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Date:   Wed, 26 Oct 2022 10:34:36 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH 1/1] dt-bindings: net: snps,dwmac: Document queue config
 subnodes

On 21/10/2022 13:10, Sebastian Reichel wrote:
> The queue configuration is referenced by snps,mtl-rx-config and
> snps,mtl-tx-config. Most in-tree DTs put the referenced object
> as child node of the dwmac node.
> 
> This adds proper description for this setup, which has the
> advantage of properly making sure only known properties are
> used.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> ---
>  .../devicetree/bindings/net/snps,dwmac.yaml   | 154 ++++++++++++------
>  1 file changed, 108 insertions(+), 46 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> index 13b984076af5..0bf6112cec2f 100644
> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> @@ -167,56 +167,118 @@ properties:
>    snps,mtl-rx-config:
>      $ref: /schemas/types.yaml#/definitions/phandle
>      description:
> -      Multiple RX Queues parameters. Phandle to a node that can
> -      contain the following properties
> -        * snps,rx-queues-to-use, number of RX queues to be used in the
> -          driver
> -        * Choose one of these RX scheduling algorithms
> -          * snps,rx-sched-sp, Strict priority
> -          * snps,rx-sched-wsp, Weighted Strict priority
> -        * For each RX queue
> -          * Choose one of these modes
> -            * snps,dcb-algorithm, Queue to be enabled as DCB
> -            * snps,avb-algorithm, Queue to be enabled as AVB
> -          * snps,map-to-dma-channel, Channel to map
> -          * Specifiy specific packet routing
> -            * snps,route-avcp, AV Untagged Control packets
> -            * snps,route-ptp, PTP Packets
> -            * snps,route-dcbcp, DCB Control Packets
> -            * snps,route-up, Untagged Packets
> -            * snps,route-multi-broad, Multicast & Broadcast Packets
> -          * snps,priority, bitmask of the tagged frames priorities assigned to
> -            the queue
> +      Multiple RX Queues parameters. Phandle to a node that
> +      implements the 'rx-queues-config' object described in
> +      this binding.
> +
> +  rx-queues-config:
> +    type: object
> +    properties:
> +      snps,rx-queues-to-use:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: number of RX queues to be used in the driver
> +      snps,rx-sched-sp:
> +        type: boolean
> +        description: Strict priority
> +      snps,rx-sched-wsp:
> +        type: boolean
> +        description: Weighted Strict priority
> +    patternProperties:
> +      "^queue[0-9]$":
> +        description: Each subnode represents a queue.
> +        type: object
> +        properties:
> +          snps,dcb-algorithm:
> +            type: boolean
> +            description: Queue to be enabled as DCB
> +          snps,avb-algorithm:
> +            type: boolean
> +            description: Queue to be enabled as AVB
> +          snps,map-to-dma-channel:
> +            $ref: /schemas/types.yaml#/definitions/uint32
> +            description: DMA channel id to map
> +          snps,route-avcp:
> +            type: boolean
> +            description: AV Untagged Control packets
> +          snps,route-ptp:
> +            type: boolean
> +            description: PTP Packets
> +          snps,route-dcbcp:
> +            type: boolean
> +            description: DCB Control Packets
> +          snps,route-up:
> +            type: boolean
> +            description: Untagged Packets
> +          snps,route-multi-broad:
> +            type: boolean
> +            description: Multicast & Broadcast Packets
> +          snps,priority:
> +            $ref: /schemas/types.yaml#/definitions/uint32
> +            description: Bitmask of the tagged frames priorities assigned to the queue

If we are not going to fix it, at least let's improve the constraints,
so add allOf:if:then here (with proper indentation) which disallows
mixing mutually exclusive properties.
Here's example:
https://elixir.bootlin.com/linux/v5.17-rc2/source/Documentation/devicetree/bindings/mfd/samsung,s5m8767.yaml#L155

Best regards,
Krzysztof