linux-kernel - Re: [PATCH v2 3/5] dt-bindings: spi: add stm32f7-spi compatible

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Date:   Fri, 3 Nov 2023 12:50:53 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Ben Wolsieffer <ben.wolsieffer@...ring.com>
Cc:     linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Alain Volmat <alain.volmat@...s.st.com>,
        Erwan Leray <erwan.leray@...s.st.com>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>
Subject: Re: [PATCH v2 3/5] dt-bindings: spi: add stm32f7-spi compatible

On Thu, Nov 02, 2023 at 03:37:20PM -0400, Ben Wolsieffer wrote:
> The STM32F7 SPI peripheral is nearly identical to the STM32F4, with the
> only significant differences being support for a wider range of word
> sizes and the addition of 32-bit transmit and receive FIFOs.

A wider range of supported word sizes and some additional buffers,
implies that the F4 could be used as a fallback compatible. Does the
register map change incompatibly in the process of widening the FIFOs or
something like that?

Cheers,
Conor.

> 
> Signed-off-by: Ben Wolsieffer <ben.wolsieffer@...ring.com>
> ---
>  Documentation/devicetree/bindings/spi/st,stm32-spi.yaml | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
> index ae0f082bd377..5754d603f34f 100644
> --- a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
> +++ b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
> @@ -23,6 +23,7 @@ properties:
>    compatible:
>      enum:
>        - st,stm32f4-spi
> +      - st,stm32f7-spi
>        - st,stm32h7-spi
>  
>    reg:
> -- 
> 2.42.0
> 

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