Re: [PATCH v2 1/6] dt-bindings: spi: sun6i: add DT bindings for Allwinner R329 SPI

[Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>]

On 06/05/2023 14:59, Maxim Kiselev wrote:
>> Should this not be set up as a fallback compatible, per Samuel's
>> suggestion here:
> 
> Ok, I'll do it in the next version.
> 
>> I wonder what is the difference of DBI compatible. You refer to "helper
>> functions", which sounds like driver... do you mean some parts of SPI
>> controller?
> 
> According to the D1 datasheet the SPI_DBI controller uses the same
> registers layout as the regular SPI0 controller.
> But also it has an additional DBI mode functionality. Support for this
> mode is not yet implemented.
> So there is no difference between 'sun50i-r329-spi' and
> 'sun50i-r329-spi-dbi' controllers types in the SPI driver.
> 
> Maybe we should drop 'sun50i-r329-spi-dbi' compatible struct from here
> https://lore.kernel.org/lkml/20230506073018.1411583-5-bigunclemax@xxxxxxxxx/
> for a while the DBI mode functionality will not be implemented?

You need both compatibles, but keep DBI compatible with regular one.

Best regards,
Krzysztof