linux-kernel - [PATCH v4 1/4] dmaengine: sh: rz_dmac: make error interrupt optional

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Message-ID: <20260105114445.878262-2-cosmin-gabriel.tanislav.xa@renesas.com>
Date: Mon,  5 Jan 2026 13:44:42 +0200
From: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
To: Vinod Koul <vkoul@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	Johan Hovold <johan@...nel.org>,
	Biju Das <biju.das.jz@...renesas.com>
Cc: dmaengine@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org
Subject: [PATCH v4 1/4] dmaengine: sh: rz_dmac: make error interrupt optional

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@...esas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
---

V4:
 * pick up Geert's Reviewed-by

V3:
 * no changes

V2:
 * remove notes

 drivers/dma/sh/rz-dmac.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c
index 9e5f088355e2..801e363f341f 100644
--- a/drivers/dma/sh/rz-dmac.c
+++ b/drivers/dma/sh/rz-dmac.c
@@ -959,16 +959,15 @@ static int rz_dmac_probe(struct platform_device *pdev)
 	}
 
 	/* Register interrupt handler for error */
-	irq = platform_get_irq_byname(pdev, irqname);
-	if (irq < 0)
-		return irq;
-
-	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);
-		return ret;
+	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);
+			return ret;
+		}
 	}
 
 	/* Initialize the channels. */
-- 
2.52.0