of: reserved_mem: set dma_ops for devices using reserved mem

For some IPs, there may be virtual child devices created and for them its
necessary to set the dma_ops if it's using reserved memory else it will call
the dummy dma_ops during buffer operations for the child devices which will
lead to memory mapping failure.
Signed-off-by: Smitha T Murthy <smitha.t@samsung.com>
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Rob Herring <robh@kernel.org>

drivers/of/of_reserved_mem.c

@@ -354,6 +354,10 @@ int of_reserved_mem_device_init_by_idx(struct device *dev,
 		mutex_lock(&of_rmem_assigned_device_mutex);
 		list_add(&rd->list, &of_rmem_assigned_device_list);
 		mutex_unlock(&of_rmem_assigned_device_mutex);
+		/* ensure that dma_ops is set for virtual devices
+		 * using reserved memory
+		 */
+		of_dma_configure(dev, np);
 
 		dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
 	} else {