device property: Unify access to of_node

Historically we have a few variants how we access dev->fwnode
and dev->of_node. Some of the functions during development
gained different versions of the getters. Unify access to of_node
and as a side change slightly refactor ACPI specific branches.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: andy-shev

drivers/base/property.c

@@ -759,13 +759,8 @@ EXPORT_SYMBOL_GPL(fwnode_get_next_available_child_node);
 struct fwnode_handle *device_get_next_child_node(struct device *dev,
 						 struct fwnode_handle *child)
 {
-	struct acpi_device *adev = ACPI_COMPANION(dev);
-	struct fwnode_handle *fwnode = NULL, *next;
-
-	if (dev->of_node)
-		fwnode = of_fwnode_handle(dev->of_node);
-	else if (adev)
-		fwnode = acpi_fwnode_handle(adev);
+	const struct fwnode_handle *fwnode = dev_fwnode(dev);
+	struct fwnode_handle *next;
 
 	/* Try to find a child in primary fwnode */
 	next = fwnode_get_next_child_node(fwnode, child);
@@ -868,28 +863,31 @@ EXPORT_SYMBOL_GPL(device_get_child_node_count);
 
 bool device_dma_supported(struct device *dev)
 {
+	const struct fwnode_handle *fwnode = dev_fwnode(dev);
+
 	/* For DT, this is always supported.
 	 * For ACPI, this depends on CCA, which
 	 * is determined by the acpi_dma_supported().
 	 */
-	if (IS_ENABLED(CONFIG_OF) && dev->of_node)
+	if (is_of_node(fwnode))
 		return true;
 
-	return acpi_dma_supported(ACPI_COMPANION(dev));
+	return acpi_dma_supported(to_acpi_device_node(fwnode));
 }
 EXPORT_SYMBOL_GPL(device_dma_supported);
 
 enum dev_dma_attr device_get_dma_attr(struct device *dev)
 {
+	const struct fwnode_handle *fwnode = dev_fwnode(dev);
 	enum dev_dma_attr attr = DEV_DMA_NOT_SUPPORTED;
 
-	if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
-		if (of_dma_is_coherent(dev->of_node))
+	if (is_of_node(fwnode)) {
+		if (of_dma_is_coherent(to_of_node(fwnode)))
 			attr = DEV_DMA_COHERENT;
 		else
 			attr = DEV_DMA_NON_COHERENT;
 	} else
-		attr = acpi_get_dma_attr(ACPI_COMPANION(dev));
+		attr = acpi_get_dma_attr(to_acpi_device_node(fwnode));
 
 	return attr;
 }
@@ -1007,14 +1005,13 @@ EXPORT_SYMBOL(device_get_mac_address);
  * Returns Linux IRQ number on success. Other values are determined
  * accordingly to acpi_/of_ irq_get() operation.
  */
-int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index)
+int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index)
 {
-	struct device_node *of_node = to_of_node(fwnode);
 	struct resource res;
 	int ret;
 
-	if (IS_ENABLED(CONFIG_OF) && of_node)
-		return of_irq_get(of_node, index);
+	if (is_of_node(fwnode))
+		return of_irq_get(to_of_node(fwnode), index);
 
 	ret = acpi_irq_get(ACPI_HANDLE_FWNODE(fwnode), index, &res);
 	if (ret)

include/linux/property.h

@@ -119,7 +119,7 @@ struct fwnode_handle *device_get_named_child_node(struct device *dev,
 struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
 void fwnode_handle_put(struct fwnode_handle *fwnode);
 
-int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index);
+int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
 
 unsigned int device_get_child_node_count(struct device *dev);