SPI not working on 5.10 and 5.11, bisected to 766c6b63aa04 ("spi: fix client driver breakages when using GPIO descriptors")

[Christophe Leroy]

Le 14/01/2021 à 14:22, Mark Brown a écrit :
> 
> For GPIO chipselects you should really fix the driver to just hand the
> GPIO off to the core rather than trying to implement this itself, that
> will avoid driver specific differences like this.
> 

IIUC, it is not trivial as it requires implementing transfer_one() instead of the existing 
transfer_one_message() in the driver. Am I right ?

What's the difference/benefit of transfer_one() compared to the existing transfer_one_message() ?