[PATCH 6.12.y-cip 4/8] dmaengine: sh: rz_dmac: make error interrupt optional

From: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>

commit b34f3fcae72a0afdd1a966fd68309b461bf678e6 upstream.

The Renesas RZ/T2H (R9A09G077) and RZ/N2H (R9A09G087) SoCs do not have
an error interrupt for the DMACs, and the current driver implementation
does not make much use of it.

To prepare for adding support for these SoCs, do not error out if the
error interrupt is missing.

Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260105114445.878262-2-cosmin-gabriel.tanislav.xa@renesas.com (local)
Signed-off-by: Vinod Koul <vkoul@kernel.org>
[PL: manually applied the changes.]
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/dma/sh/rz-dmac.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c
index 52cfd31890947..2097c3033a567 100644
--- a/drivers/dma/sh/rz-dmac.c
+++ b/drivers/dma/sh/rz-dmac.c

@@ -987,18 +987,15 @@ static int rz_dmac_probe(struct platform_device *pdev)
 	}
 
 	/* Register interrupt handler for error */
-	irq = platform_get_irq_byname(pdev, irqname);
-	if (irq < 0) {
-		ret = irq;
-		goto err;
-	}
-
-	ret = devm_request_irq(&pdev->dev, irq, rz_dmac_irq_handler, 0,
-			       irqname, NULL);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to request IRQ %u (%d)\n",
-			irq, ret);
-		goto err;
+	irq = platform_get_irq_byname_optional(pdev, irqname);
+	if (irq > 0) {
+		ret = devm_request_irq(&pdev->dev, irq, rz_dmac_irq_handler, 0,
+				       irqname, NULL);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to request IRQ %u (%d)\n",
+				irq, ret);
+			goto err;
+		}
 	}
 
 	/* Register the DMAC as a DMA provider for DT. */

-- 
2.43.0