linux-kernel - [PATCH v2 1/6] dmaengine: sh: rz_dmac: make error interrupt optional

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Message-ID: <20251201124911.572395-2-cosmin-gabriel.tanislav.xa@renesas.com>
Date: Mon,  1 Dec 2025 14:49:06 +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 v2 1/6] 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>
---

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 38137e8d80b9..20a5c1766a58 100644
--- a/drivers/dma/sh/rz-dmac.c
+++ b/drivers/dma/sh/rz-dmac.c
@@ -954,16 +954,15 @@ 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