[PATCHv3] dmaengine: fsldma: convert to platform_get_irq_optional()

[Rosen Penev <rosenp@gmail.com>]

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

Moved before anything else in order to handle -EPROBE_DEFER and to avoid
doing extra work. Simplifies the if statements as well.

Assisted-by: LLM
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 v3: fix build error from the move
 v2: move to the front of probe.
 drivers/dma/fsldma.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index fb19c60540be..6db2c4d284c9 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -1224,8 +1224,13 @@ static int fsldma_of_probe(struct platform_device *op)
 	struct fsldma_device *fdev;
 	struct device_node *child;
 	unsigned int i;
+	int irq;
 	int err;
 
+	irq = platform_get_irq_optional(op, 0);
+	if (irq == -EPROBE_DEFER)
+		return irq;
+
 	fdev = kzalloc_obj(*fdev);
 	if (!fdev) {
 		err = -ENOMEM;
@@ -1246,7 +1251,9 @@ 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 = irq;
+	if (fdev->irq < 0)
+		fdev->irq = 0;
 
 	dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask);
 	dma_cap_set(DMA_SLAVE, fdev->common.cap_mask);
@@ -1308,7 +1315,6 @@ 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);
@@ -1330,7 +1336,6 @@ 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);
-- 
2.55.0