Re: [PATCH 1/2] spi: dt-bindings: spi-fsl-qspi: add optional sampling-delay

[Michael Walle <michael@xxxxxxxx>]

From: "han.xu" <han.xu@xxxxxxx>

Hi,

>>> unfortunately, the rx-sample-delay-ns property does not fit here, as we 
>>> can only delay
>>> the sampling point between zero and three "half cycles" (or edges), not 
>>> by an arbitrary
>>> number of nanoseconds.
>> 
>> Why this is a problem for FSL but not for other platforms having exactly
>> the same constraints/property?
>
> Please use the common delay in DT and calculate to half cycle in driver, we have
> the similar discussion before for fspi controller delay settings.

Do you mean [1]? There my suggestion was to use a -degrees property (because
it doesn't depend on the frequency). There wasn't any follow-up, or did I miss
something?

-michael

[1] https://lore.kernel.org/linux-spi/62f113a0cdb0d58bf04ab0b274912eb7@xxxxxxxx/