linux-kernel - Re: [PATCH V2 1/3] dt-bindings: nvmem: brcm,nvram: add #nvmem-cell-cells for MACs

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Date:   Fri, 12 May 2023 11:14:51 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Rafał Miłecki <zajec5@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH V2 1/3] dt-bindings: nvmem: brcm,nvram: add
 #nvmem-cell-cells for MACs



On 21/04/2023 09:43, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
> 
> Broadcom's NVRAM contains MACs for Ethernet interfaces. Those MACs are
> usually base addresses that are also used for calculating other MACs.
> 
> For example if a router vendor decided to use gmac0 it most likely
> programmed NVRAM of each unit with a proper "et0macaddr" value. That is
> a base.
> 
> Ethernet interface is usually connected to switch port. Switch usually
> includes few LAN ports and a WAN port. MAC of WAN port gets calculated
> as relative address to the interface one. Offset varies depending on
> device model.
> 
> Wireless MACs may also need to be calculated using relevant offsets.
> 
> To support all those scenarios let MAC NVMEM cells be referenced with an
> index specifying MAC offset. Disallow additionalProperties while at it.
> 
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---

Applied thanks,

--srini
> V2: Add additionalProperties: false
> ---
>   .../devicetree/bindings/nvmem/brcm,nvram.yaml     | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml b/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml
> index 36def7128fca..13412af7f046 100644
> --- a/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml
> +++ b/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml
> @@ -36,14 +36,29 @@ properties:
>     et0macaddr:
>       type: object
>       description: First Ethernet interface's MAC address
> +    properties:
> +      "#nvmem-cell-cells":
> +        description: The first argument is a MAC address offset.
> +        const: 1
> +    additionalProperties: false
>   
>     et1macaddr:
>       type: object
>       description: Second Ethernet interface's MAC address
> +    properties:
> +      "#nvmem-cell-cells":
> +        description: The first argument is a MAC address offset.
> +        const: 1
> +    additionalProperties: false
>   
>     et2macaddr:
>       type: object
>       description: Third Ethernet interface's MAC address
> +    properties:
> +      "#nvmem-cell-cells":
> +        description: The first argument is a MAC address offset.
> +        const: 1
> +    additionalProperties: false
>   
>   unevaluatedProperties: false
>