spi: stm32-ospi: Use of_reserved_mem_region_to_resource() for "memory-region"

Use the newly added of_reserved_mem_region_to_resource() function to
handle "memory-region" properties.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250709021638.2047365-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: robherring

drivers/spi/spi-stm32-ospi.c

@@ -766,9 +766,7 @@ static int stm32_ospi_get_resources(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct stm32_ospi *ospi = platform_get_drvdata(pdev);
-	struct resource *res;
-	struct reserved_mem *rmem = NULL;
-	struct device_node *node;
+	struct resource *res, _res;
 	int ret;
 
 	ospi->regs_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
@@ -820,17 +818,13 @@ static int stm32_ospi_get_resources(struct platform_device *pdev)
 			goto err_dma;
 	}
 
-	node = of_parse_phandle(dev->of_node, "memory-region", 0);
-	if (node)
-		rmem = of_reserved_mem_lookup(node);
-	of_node_put(node);
-
-	if (rmem) {
-		ospi->mm_size = rmem->size;
-		ospi->mm_base = devm_ioremap(dev, rmem->base, rmem->size);
+	res = &_res;
+	ret = of_reserved_mem_region_to_resource(dev->of_node, 0, res);
+	if (!ret) {
+		ospi->mm_size = resource_size(res);
+		ospi->mm_base = devm_ioremap_resource(dev, res);
 		if (!ospi->mm_base) {
-			dev_err(dev, "unable to map memory region: %pa+%pa\n",
-				&rmem->base, &rmem->size);
+			dev_err(dev, "unable to map memory region: %pR\n", res);
 			ret = -ENOMEM;
 			goto err_dma;
 		}