fsldma: Set correct dma_mask based on hw capability

The driver currently hardcodes DMA_BIT_MASK to 36-bits, which is only
correct on eloplus:

elo3		supports 40-bits
eloplus		supports 36-bits
elo		supports 32-bits

This is based on 0x08 cdar register documention in the respective
reference manuals. Set the dma mask accordingly.

Feedback from Arnd Bergmann:

- Use match data to set address bit mask

Signed-off-by: Ben Collins <bcollins@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: dmaengine@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/2025050513-complex-crane-2babb6@boujee-and-buff
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: Ben Collins

drivers/dma/fsldma.c

@@ -1226,6 +1226,8 @@ static int fsldma_of_probe(struct platform_device *op)
 
 	fdev->dev = &op->dev;
 	INIT_LIST_HEAD(&fdev->common.channels);
+	/* The DMA address bits supported for this device. */
+	fdev->addr_bits = (long)device_get_match_data(fdev->dev);
 
 	/* ioremap the registers for use */
 	fdev->regs = of_iomap(op->dev.of_node, 0);
@@ -1254,7 +1256,7 @@ static int fsldma_of_probe(struct platform_device *op)
 	fdev->common.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 	fdev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
 
-	dma_set_mask(&(op->dev), DMA_BIT_MASK(36));
+	dma_set_mask(&(op->dev), DMA_BIT_MASK(fdev->addr_bits));
 
 	platform_set_drvdata(op, fdev);
 
@@ -1387,10 +1389,20 @@ static const struct dev_pm_ops fsldma_pm_ops = {
 };
 #endif
 
+/* The .data field is used for dma-bit-mask. */
 static const struct of_device_id fsldma_of_ids[] = {
-	{ .compatible = "fsl,elo3-dma", },
-	{ .compatible = "fsl,eloplus-dma", },
-	{ .compatible = "fsl,elo-dma", },
+	{
+		.compatible = "fsl,elo3-dma",
+		.data = (void *)40,
+	},
+	{
+		.compatible = "fsl,eloplus-dma",
+		.data = (void *)36,
+	},
+	{
+		.compatible = "fsl,elo-dma",
+		.data = (void *)32,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, fsldma_of_ids);

drivers/dma/fsldma.h

@@ -124,6 +124,7 @@ struct fsldma_device {
 	struct fsldma_chan *chan[FSL_DMA_MAX_CHANS_PER_DEVICE];
 	u32 feature;		/* The same as DMA channels */
 	int irq;		/* Channel IRQ */
+	int addr_bits;		/* DMA addressing bits supported */
 };
 
 /* Define macros for fsldma_chan->feature property */