Re: [PATCH v4 12/39] dt-bindings: serial: atmel,at91-usart: add compatible for sam9x7.

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On Fri, Feb 23, 2024 at 10:55:59PM +0530, Varshini Rajendran wrote:
> Add sam9x7 compatible to DT bindings documentation.
> 
> Signed-off-by: Varshini Rajendran <varshini.rajendran@xxxxxxxxxxxxx>
> ---
> Changes in v4:
> - Fixed the wrong addition of compatible
> - Added further compatibles that are possible correct (as per DT)
> ---
>  .../devicetree/bindings/serial/atmel,at91-usart.yaml | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/serial/atmel,at91-usart.yaml b/Documentation/devicetree/bindings/serial/atmel,at91-usart.yaml
> index 65cb2e5c5eee..30af537e8e81 100644
> --- a/Documentation/devicetree/bindings/serial/atmel,at91-usart.yaml
> +++ b/Documentation/devicetree/bindings/serial/atmel,at91-usart.yaml
> @@ -23,11 +23,17 @@ properties:
>            - const: atmel,at91sam9260-dbgu
>            - const: atmel,at91sam9260-usart
>        - items:
> -          - const: microchip,sam9x60-usart
> +          - enum:
> +              - microchip,sam9x60-usart
> +              - microchip,sam9x7-usart
>            - const: atmel,at91sam9260-usart
>        - items:
> -          - const: microchip,sam9x60-dbgu
> -          - const: microchip,sam9x60-usart
> +          - enum:
> +              - microchip,sam9x60-dbgu
> +              - microchip,sam9x7-dbgu

> +          - enum:
> +              - microchip,sam9x60-usart
> +              - microchip,sam9x7-usart

This doesn't make sense - this enum should be a const.
I don't really understand the idea behind of the original binding here that
allowed:
"microchip,sam9x60-dbgu", "microchip,sam9x60-usart", "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart"

Specifically, I don't get the purpose of the "microchip,sam9x60-usart".
Either make it
      - items:
          - enum:
              - microchip,sam9x60-dbgu
              - microchip,sam9x7-dbgu
          - const: microchip,sam9x60-usart
          - const: atmel,at91sam9260-dbgu
          - const: atmel,at91sam9260-usart
or add
      - items:
          - const: microchip,sam9x60-dbgu
          - const: atmel,at91sam9260-dbgu
          - const: atmel,at91sam9260-usart
or explain exactly why this needs to be
"chipa-dgbu", "chipa-usart", "chipb-dbgu", "chipb-dbgu"

Thanks,
Conor.

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