Allow using the RX half and TX half in different (CPU/DMA) modes (Sometimes you only really need DMA in one half of the SPI transfer. This one might be difficult to support)

[bjoernQ]

No description provided.

[MabezDev]

This feels out of scope for the HAL, and more like a 3rd party driver down the line.

[Dominaezzz]

As the one who raised the issue, I somewhat agree.

This is a problem for the SPI DMA driver to tackle, which isn't getting stabilised, so I'd say this isn't a 1.0 blocker and can't really be investigated until DMA is up for stabilisation.