of: address: Retrieve a parent through a callback in __of_translate_address

The __of_translate_address function is used to translate the device tree
addresses to physical addresses using the various ranges property to create
the offset.

However, it's shared between the CPU addresses (based on the ranges
property) and the DMA addresses (based on dma-ranges). Since we're going to
add support for a DMA parent node that is not the DT parent node, we need
to change the logic a bit to have a callback function that will retrieve
the parent node we should use.
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Rob Herring <robh@kernel.org>

drivers/of/address.c

@@ -569,6 +569,7 @@ static int of_translate_one(struct device_node *parent, struct of_bus *bus,
  * relative to that node.
  */
 static u64 __of_translate_address(struct device_node *dev,
+				  struct device_node *(*get_parent)(const struct device_node *),
 				  const __be32 *in_addr, const char *rprop,
 				  struct device_node **host)
 {
@@ -585,7 +586,7 @@ static u64 __of_translate_address(struct device_node *dev,
 
 	*host = NULL;
 	/* Get parent & match bus type */
-	parent = of_get_parent(dev);
+	parent = get_parent(dev);
 	if (parent == NULL)
 		goto bail;
 	bus = of_match_bus(parent);
@@ -609,7 +610,7 @@ static u64 __of_translate_address(struct device_node *dev,
 		/* Switch to parent bus */
 		of_node_put(dev);
 		dev = parent;
-		parent = of_get_parent(dev);
+		parent = get_parent(dev);
 
 		/* If root, we have finished */
 		if (parent == NULL) {
@@ -665,7 +666,8 @@ u64 of_translate_address(struct device_node *dev, const __be32 *in_addr)
 	struct device_node *host;
 	u64 ret;
 
-	ret = __of_translate_address(dev, in_addr, "ranges", &host);
+	ret = __of_translate_address(dev, of_get_parent,
+				     in_addr, "ranges", &host);
 	if (host) {
 		of_node_put(host);
 		return OF_BAD_ADDR;
@@ -680,7 +682,8 @@ u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
 	struct device_node *host;
 	u64 ret;
 
-	ret = __of_translate_address(dev, in_addr, "dma-ranges", &host);
+	ret = __of_translate_address(dev, of_get_parent,
+				     in_addr, "dma-ranges", &host);
 
 	if (host) {
 		of_node_put(host);
@@ -736,7 +739,8 @@ static u64 of_translate_ioport(struct device_node *dev, const __be32 *in_addr,
 	unsigned long port;
 	struct device_node *host;
 
-	taddr = __of_translate_address(dev, in_addr, "ranges", &host);
+	taddr = __of_translate_address(dev, of_get_parent,
+				       in_addr, "ranges", &host);
 	if (host) {
 		/* host-specific port access */
 		port = logic_pio_trans_hwaddr(&host->fwnode, taddr, size);