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

[Krzysztof Kozlowski]

On 08/08/2022 19:08, Patrice CHOTARD wrote:
> Hi Krzystof
> 
> On 8/8/22 11:01, Krzysztof Kozlowski wrote:
>> On 08/08/2022 10:40, patrice.chotard@xxxxxxxxxxx wrote:
>>> From: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>
>>>
>>> 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@xxxxxxxxxxx>
>>> ---
>>>  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?
> 
> I called it "dual-flash" simply because it enable the dual flash feature of the QSPI block (bit CR_DFM : Dual Flash Mode)
> which allows to use the 8 lines simultaneously of our dual QSPI block.

And how is it related to existing parallel-memories property?

Best regards,
Krzysztof