linux-kernel - Re: [PATCH v2 04/14] dt-bindings: arm: mediatek: document WED binding for MT7622

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Message-ID: <d0bffa9a-0ea6-0f59-06b2-7eef3c746de1@linaro.org>
Date:   Wed, 6 Apr 2022 10:09:24 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Felix Fietkau <nbd@....name>, netdev@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/14] dt-bindings: arm: mediatek: document WED binding
 for MT7622

On 05/04/2022 21:57, Felix Fietkau wrote:
> From: Lorenzo Bianconi <lorenzo@...nel.org>
> 
> Document the binding for the Wireless Ethernet Dispatch core on the MT7622
> SoC, which is used for Ethernet->WLAN offloading
> Add related info in mediatek-net bindings.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> Signed-off-by: Felix Fietkau <nbd@....name>

Thank you for your patch. There is something to discuss/improve.

> ---
>  .../arm/mediatek/mediatek,mt7622-wed.yaml     | 50 +++++++++++++++++++
>  .../devicetree/bindings/net/mediatek-net.txt  |  2 +
>  2 files changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-wed.yaml

Don't store drivers in arm directory. See:
https://lore.kernel.org/linux-devicetree/YkJa1oLSEP8R4U6y@robh.at.kernel.org/

Isn't this a network offload engine? If yes, then probably it should be
in "net/".

> 
> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-wed.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-wed.yaml
> new file mode 100644
> index 000000000000..787d6673f952
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-wed.yaml
> @@ -0,0 +1,50 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/arm/mediatek/mediatek,mt7622-wed.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: MediaTek Wireless Ethernet Dispatch Controller for MT7622
> +
> +maintainers:
> +  - Lorenzo Bianconi <lorenzo@...nel.org>
> +  - Felix Fietkau <nbd@....name>
> +
> +description:
> +  The mediatek wireless ethernet dispatch controller can be configured to
> +  intercept and handle access to the WLAN DMA queues and PCIe interrupts
> +  and implement hardware flow offloading from ethernet to WLAN.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - mediatek,mt7622-wed
> +      - const: syscon
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    soc {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +      wed0: wed@...0a000 {

Generic node name, "wed" is specific. Maybe "network-offload"? Or
"network-accelerator"? You probably know better what this device does,
so maybe come with some generic name?

The same in DTS patch.

The bindings themself look ok.

Best regards,
Krzysztof