Replace the per-controller irq_of_parse_and_map() call with
platform_get_irq_optional(). The controller IRQ is optional — when
absent (-ENXIO) the driver falls back to per-channel IRQs. Any other
error is treated as fatal. The corresponding irq_dispose_mapping()
calls in the probe error path and remove function are removed.

The per-channel IRQ mapping in fsl_dma_chan_probe() uses a child
device_node rather than the platform device's of_node, so it is not
converted here.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <redacted>
---
 drivers/dma/fsldma.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 98d02809ade5..08a8090178f8 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c

@@ -1239,7 +1239,16 @@ static int fsldma_of_probe(struct platform_device *op)
 	}

 	/* map the channel IRQ if it exists, but don't hookup the handler yet */
-	fdev->irq = irq_of_parse_and_map(op->dev.of_node, 0);
+	fdev->irq = platform_get_irq_optional(op, 0);
+	if (fdev->irq < 0) {
+		if (fdev->irq != -ENXIO) {
+			err = fdev->irq;
+			iounmap(fdev->regs);
+			kfree(fdev);

+			return err;
+		}
+		fdev->irq = 0;
+	}

 	dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask);
 	dma_cap_set(DMA_SLAVE, fdev->common.cap_mask);

@@ -1301,7 +1310,6 @@ static int fsldma_of_probe(struct platform_device *op)
 		if (fdev->chan[i])
 			fsl_dma_chan_remove(fdev->chan[i]);
 	}
-	irq_dispose_mapping(fdev->irq);
 	iounmap(fdev->regs);
 out_free:
 	kfree(fdev);

@@ -1323,7 +1331,6 @@ static void fsldma_of_remove(struct platform_device *op)
 		if (fdev->chan[i])
 			fsl_dma_chan_remove(fdev->chan[i]);
 	}
-	irq_dispose_mapping(fdev->irq);

 	iounmap(fdev->regs);
 	kfree(fdev);
--

2.54.0