linux-kernel - Re: [PATCH 1/3] dt-bindings: spi: stm32: Add st,dual-flash property in st,stm32-qspi.yaml

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Date:   Mon, 8 Aug 2022 12:01:28 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     patrice.chotard@...s.st.com, Mark Brown <broonie@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org
Cc:     linux-spi@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        christophe.kerello@...s.st.com, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: spi: stm32: Add st,dual-flash property
 in st,stm32-qspi.yaml

On 08/08/2022 10:40, patrice.chotard@...s.st.com wrote:
> From: Patrice Chotard <patrice.chotard@...s.st.com>
> 
> Add new property st,dual-flash which allows to use the QSPI interface as a
> communication channel using up to 8 qspi line.
> This mode can only be used if cs-gpios property is defined.
> 
> Signed-off-by: Patrice Chotard <patrice.chotard@...s.st.com>
> ---
>  Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
> index 6ec6f556182f..5e4f9109799e 100644
> --- a/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
> +++ b/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
> @@ -46,6 +46,14 @@ properties:
>        - const: tx
>        - const: rx
>  
> +  st,dual-flash:
> +    type: boolean
> +    description:
> +      Allows to use 8 data lines in case cs-gpios property is defined.

It's named dual-flash, but what if you want to use QSPI to connect for
example to FPGA?

Also how is this related to parallel-memories property?

Best regards,
Krzysztof