dmaengine: sh: rz-dmac: Allow for multiple DMACs

dma_request_channel() calls into __dma_request_channel() with
NULL as value for np, which won't allow for the selection of the
correct DMAC when multiple DMACs are available.

Switch to using __dma_request_channel() directly so that we can
choose the desired DMA for the channel. This is in preparation
of adding DMAC support for the Renesas RZ/V2H(P) and similar SoCs.

Signed-off-by: Fabrizio Castro <[email protected]>
Reviewed-by: Lad Prabhakar <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: Fabrizio Castro

drivers/dma/sh/rz-dmac.c

@@ -748,7 +748,8 @@ static struct dma_chan *rz_dmac_of_xlate(struct of_phandle_args *dma_spec,
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
-	return dma_request_channel(mask, rz_dmac_chan_filter, dma_spec);
+	return __dma_request_channel(&mask, rz_dmac_chan_filter, dma_spec,
+				     ofdma->of_node);
 }
 
 /*