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@nxp.com>
Link: https://patch.msgid.link/20260225-mxsdma-module-v3-1-8f798b13baa6@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/include/linux/of_dma.h b/include/linux/of_dma.h
index fd706cdf255c61c82ce30ef9a2c44930bef34bc8..16b08234d03b33476ea3f8cc6654f6fd72e60df3 100644 (file)
--- 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 *),