drivers: spi: siwx91x: Use GPDMA rather than UDMA
Silabs siwx91x offer two DMA hardware block: GPDMA and UDMA.
While UDMA has some benefit when running in low power modes, GPDMA offer
better performances. So GDMA is probably better suited for SPI device.
Ideally, we would like to leave the ability to switch back to UDMA.
Unfortunately, UDMA and GPDMA are not configured in the same way:
- the maximum length of the block are different (1024 or 2048 for UDMA
and 4096 for GPDMA)
- the burst length is different
So, we only support GPDMA.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
1 file changed
