mtd: rawnand: lpx32xx: Request DMA channels using DT entries

Move away from pl08x platform data towards device tree.
Signed-off-by: Piotr Wojtaszczyk <piotr.wojtaszczyk@timesys.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240627150046.258795-11-piotr.wojtaszczyk@timesys.com

drivers/mtd/nand/raw/lpc32xx_mlc.c

@@ -574,6 +574,9 @@ static int lpc32xx_dma_setup(struct lpc32xx_nand_host *host)
 	struct mtd_info *mtd = nand_to_mtd(&host->nand_chip);
 	dma_cap_mask_t mask;
 
+	host->dma_chan = dma_request_chan(mtd->dev.parent, "rx-tx");
+	if (!host->dma_chan) {
+		/* fallback to request using platform data */
 		if (!host->pdata || !host->pdata->dma_filter) {
 			dev_err(mtd->dev.parent, "no DMA platform data\n");
 			return -ENOENT;
@@ -581,12 +584,13 @@ static int lpc32xx_dma_setup(struct lpc32xx_nand_host *host)
 
 		dma_cap_zero(mask);
 		dma_cap_set(DMA_SLAVE, mask);
-	host->dma_chan = dma_request_channel(mask, host->pdata->dma_filter,
-					     "nand-mlc");
+		host->dma_chan = dma_request_channel(mask, host->pdata->dma_filter, "nand-mlc");
+
 		if (!host->dma_chan) {
 			dev_err(mtd->dev.parent, "Failed to request DMA channel\n");
 			return -EBUSY;
 		}
+	}
 
 	/*
 	 * Set direction to a sensible value even if the dmaengine driver

drivers/mtd/nand/raw/lpc32xx_slc.c

@@ -721,6 +721,9 @@ static int lpc32xx_nand_dma_setup(struct lpc32xx_nand_host *host)
 	struct mtd_info *mtd = nand_to_mtd(&host->nand_chip);
 	dma_cap_mask_t mask;
 
+	host->dma_chan = dma_request_chan(mtd->dev.parent, "rx-tx");
+	if (!host->dma_chan) {
+		/* fallback to request using platform data */
 		if (!host->pdata || !host->pdata->dma_filter) {
 			dev_err(mtd->dev.parent, "no DMA platform data\n");
 			return -ENOENT;
@@ -728,12 +731,13 @@ static int lpc32xx_nand_dma_setup(struct lpc32xx_nand_host *host)
 
 		dma_cap_zero(mask);
 		dma_cap_set(DMA_SLAVE, mask);
-	host->dma_chan = dma_request_channel(mask, host->pdata->dma_filter,
-					     "nand-slc");
+		host->dma_chan = dma_request_channel(mask, host->pdata->dma_filter, "nand-slc");
+
 		if (!host->dma_chan) {
 			dev_err(mtd->dev.parent, "Failed to request DMA channel\n");
 			return -EBUSY;
 		}
+	}
 
 	return 0;
 }