linux-kernel - Re: [PATCH 1/3] dt-bindings: nvmem: u-boot,env: add MAC's #nvmem-cell-cells

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Date:   Sun, 8 Jan 2023 16:17:34 -0600
From:   Rob Herring <robh@...nel.org>
To:     Rafał Miłecki <zajec5@...il.com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Michael Walle <michael@...le.cc>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        u-boot@...ts.denx.de,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH 1/3] dt-bindings: nvmem: u-boot,env: add MAC's
 #nvmem-cell-cells

On Thu, Jan 05, 2023 at 06:10:36PM +0100, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
> 
> U-Boot's "ethaddr" environment variable is very often used to store
> *base* MAC address. It's used as a base for calculating addresses for
> multiple interfaces. It's done by adding proper values. Actual offsets
> are picked by manufacturers and vary across devices.
> 
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> ---
>  Documentation/devicetree/bindings/nvmem/u-boot,env.yaml | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml b/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
> index cbc5c69fd405..1c139bd689ea 100644
> --- a/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
> +++ b/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
> @@ -50,7 +50,11 @@ properties:
>  
>    ethaddr:
>      type: object
> -    description: Ethernet interface's MAC address
> +    description:
> +      Ethernet interfaces base MAC address. The first argument is an offset.

The 2nd sentence belongs in the '#nvmem-cell-cells' description.

> +    properties:
> +      "#nvmem-cell-cells":
> +        const: 1
>  
>  additionalProperties: false
>  
> @@ -72,6 +76,7 @@ examples:
>              reg = <0x40000 0x10000>;
>  
>              mac: ethaddr {
> +                #nvmem-cell-cells = <1>;
>              };
>          };
>      };
> -- 
> 2.34.1
> 
>