linux-kernel - Re: [PATCH net-next v3 1/2] dt-bindings: mt76: support setting per-band MAC address

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Date:   Fri, 11 Aug 2023 13:09:44 -0600
From:   Rob Herring <robh@...nel.org>
To:     Daniel Golle <daniel@...rotopia.org>
Cc:     Felix Fietkau <nbd@....name>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Shayne Chen <shayne.chen@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Kalle Valo <kvalo@...nel.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>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next v3 1/2] dt-bindings: mt76: support setting
 per-band MAC address

On Mon, Jul 31, 2023 at 11:23:16PM +0100, Daniel Golle wrote:
> Introduce support for setting individual per-band MAC addresses using
> NVMEM cells by adding a 'bands' object with enumerated child nodes
> representing the 2.4 GHz, 5 GHz and 6 GHz bands.
> 
> In case it is defined, call of_get_mac_address for the per-band child
> node, otherwise try with of_get_mac_address on the main device node and
> fall back to a random address like it used to be.
> 
> While at it, add MAC address related properties also for the main node.
> 
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
> Changes since v2:
>  * drop items list with only a single item
> 
> Changes since v1:
>  * add dt-bindings
> 
>  .../bindings/net/wireless/mediatek,mt76.yaml  | 58 ++++++++++++++++++-
>  1 file changed, 57 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml b/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
> index 252207adbc54c..7eafed53da1de 100644
> --- a/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
> +++ b/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
> @@ -37,6 +37,12 @@ properties:
>      description:
>        MT7986 should contain 3 regions consys, dcm, and sku, in this order.
>  
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
>    interrupts:
>      maxItems: 1
>  
> @@ -72,13 +78,23 @@ properties:
>  
>    ieee80211-freq-limit: true
>  
> +  address: true

What's this? Not a documented property.


> +
> +  local-mac-address: true
> +
> +  mac-address: true

You really need a ref to the schema defining these. But first we need to 
split them out from ethernet-controller.yaml. Which I think there were 
patches for, but it stalled out.

Anyways, it's fine for now if you're not up for that.

> +
>    nvmem-cells:
> +    minItems: 1
>      items:
>        - description: NVMEM cell with EEPROM
> +      - description: NVMEM cell with the MAC address
>  
>    nvmem-cell-names:
> +    minItems: 1
>      items:
>        - const: eeprom
> +      - const: mac-address
>  
>    mediatek,eeprom-data:
>      $ref: /schemas/types.yaml#/definitions/uint32-array
> @@ -213,6 +229,29 @@ properties:
>                      description:
>                        Half-dBm power delta for different numbers of antennas
>  
> +patternProperties:
> +  '^band@[0-2]+$':
> +    type: object
> +    additionalProperties: false
> +    properties:
> +      reg:
> +        maxItems: 1
> +
> +      address: true
> +      local-mac-address: true
> +      mac-address: true
> +
> +      nvmem-cells:
> +        description: NVMEM cell with the MAC address
> +
> +      nvmem-cell-names:
> +        const: mac-address
> +
> +    required:
> +      - reg
> +
> +    unevaluatedProperties: false
> +
>  required:
>    - compatible
>    - reg
> @@ -225,10 +264,13 @@ examples:
>        #address-cells = <3>;
>        #size-cells = <2>;
>        wifi@0,0 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
>          compatible = "mediatek,mt76";
>          reg = <0x0000 0 0 0 0>;
>          ieee80211-freq-limit = <5000000 6000000>;
> -        mediatek,mtd-eeprom = <&factory 0x8000>;
> +        nvmem-cells = <&factory_eeprom>;
> +        nvmem-cell-names = "eeprom";
>          big-endian;
>  
>          led {
> @@ -257,6 +299,20 @@ examples:
>               };
>            };
>          };
> +
> +        band@0 {
> +          /* 2.4 GHz */
> +          reg = <0>;
> +          nvmem-cells = <&macaddr 0x4>;
> +          nvmem-cell-names = "mac-address";
> +        };
> +
> +        band@1 {
> +          /* 5 GHz */
> +          reg = <1>;
> +          nvmem-cells = <&macaddr 0xa>;
> +          nvmem-cell-names = "mac-address";
> +        };
>        };
>      };
>  
> -- 
> 2.41.0