linux-kernel - [PATCH v2 01/13] dmaengine: of_dma: Add devm_of_dma_controller

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Message-Id: <20260115-mxsdma-module-v2-1-0e1638939d03@nxp.com>
Date: Thu, 15 Jan 2026 11:06:40 -0500
From: Frank Li <Frank.Li@....com>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, 
 Vinod Koul <vkoul@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: dmaengine@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, Shawn Guo <shawn.guo@...escale.com>, 
 Frank Li <Frank.Li@....com>
Subject: [PATCH v2 01/13] dmaengine: of_dma: Add
 devm_of_dma_controller_register()

Add a managed API, devm_of_dma_controller_register(), to simplify DMA
engine controller registration by automatically handling resource
cleanup.

Signed-off-by: Frank Li <Frank.Li@....com>
---
change in v2
- fixed missing int at stub funciton.
---
 include/linux/of_dma.h | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/include/linux/of_dma.h b/include/linux/of_dma.h
index fd706cdf255c61c82ce30ef9a2c44930bef34bc8..16b08234d03b33476ea3f8cc6654f6fd72e60df3 100644
--- a/include/linux/of_dma.h
+++ b/include/linux/of_dma.h
@@ -38,6 +38,26 @@ extern int of_dma_controller_register(struct device_node *np,
 		void *data);
 extern void of_dma_controller_free(struct device_node *np);
 
+static void __of_dma_controller_free(void *np)
+{
+	of_dma_controller_free(np);
+}
+
+static inline int
+devm_of_dma_controller_register(struct device *dev, struct device_node *np,
+				struct dma_chan *(*of_dma_xlate)
+				(struct of_phandle_args *, struct of_dma *),
+				void *data)
+{
+	int ret;
+
+	ret = of_dma_controller_register(np, of_dma_xlate, data);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev, __of_dma_controller_free, np);
+}
+
 extern int of_dma_router_register(struct device_node *np,
 		void *(*of_dma_route_allocate)
 		(struct of_phandle_args *, struct of_dma *),
@@ -64,6 +84,15 @@ static inline void of_dma_controller_free(struct device_node *np)
 {
 }
 
+static inline int
+devm_of_dma_controller_register(struct device *dev, struct device_node *np,
+				struct dma_chan *(*of_dma_xlate)
+				(struct of_phandle_args *, struct of_dma *),
+				void *data)
+{
+	return -ENODEV;
+}
+
 static inline int of_dma_router_register(struct device_node *np,
 		void *(*of_dma_route_allocate)
 		(struct of_phandle_args *, struct of_dma *),

-- 
2.34.1