dt-bindings: dma: snps,dw-axi-dmac: Allow devices to be marked as noncoherent

A RISC-V platform can have both DMA coherent/noncoherent devices.
Since the RISC-V architecture is marked coherent, devices should
be marked as noncoherent when coherent devices exist.

Add dma-noncoherent property for snps,dw-axi-dmac device. It will
be used on SG2044, and it has other coherent devices.

Signed-off-by: Inochi Amaoto <[email protected]>
Acked-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: inochisa

Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml

@@ -59,6 +59,8 @@ properties:
     minimum: 1
     maximum: 8
 
+  dma-noncoherent: true
+
   resets:
     minItems: 1
     maxItems: 2