linux-kernel - Re: [PATCH V1 1/4] bindings: nvmem: introduce "reverse-data" property

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Date:   Wed, 11 Aug 2021 11:16:49 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Joakim Zhang <qiangqing.zhang@....com>, robh+dt@...nel.org,
        shawnguo@...nel.org
Cc:     kernel@...gutronix.de, linux-imx@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 1/4] bindings: nvmem: introduce "reverse-data" property

On 10/08/2021 08:35, Joakim Zhang wrote:
> Introduce "reverse-data" property for nvmem provider to reverse buffer.
> 
> Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
> ---
>   Documentation/devicetree/bindings/nvmem/nvmem.yaml | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/nvmem/nvmem.yaml b/Documentation/devicetree/bindings/nvmem/nvmem.yaml
> index b8dc3d2b6e92..bc745083fc64 100644
> --- a/Documentation/devicetree/bindings/nvmem/nvmem.yaml
> +++ b/Documentation/devicetree/bindings/nvmem/nvmem.yaml
> @@ -61,6 +61,11 @@ patternProperties:
>                 description:
>                   Size in bit within the address range specified by reg.
>   
> +      reverse-data:
> +        $ref: /schemas/types.yaml#/definitions/flag
> +        description:
> +          Reverse the data that read from the storage device.
> +

This new property is only going to solve one of the reverse order issue 
here.
If I remember correctly we have mac-address stored in various formats 
ex: from old thread I can see

Type 1: Octets in ASCII without delimiters. (Swapped/non-Swapped)
Type 2: Octets in ASCII with delimiters like (":", ",", ".", "-"... so 
on) (Swapped/non-Swapped)
Type 3: Is the one which stores mac address in Type1/2 but this has to 
be incremented to be used on other instances of eth.
Type 4: Octets as bytes/u8, swapped/non-swapped

I think its right time to consider adding compatibles to nvmem-cells to 
be able to specify encoding information and handle post processing.

Lets see what Rob would say on this approach.

--srini

>       required:
>         - reg
>   
>