[PATCH 1/3] dm: core: fdtaddr: Avoid multiple calls to fdt_parent_offset()

[Jonas Karlman]

Use of fdt_parent_offset() is very expensive as detailed by the function
documentation:

  NOTE: This function is expensive, as it must scan the device tree
  structure from the start to nodeoffset, *twice*.

Re-use the returned value from a single call instead of having to make
multiple calls for same nodeoffset.

Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
---
 drivers/core/fdtaddr.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/core/fdtaddr.c b/drivers/core/fdtaddr.c
index 9e59968df016..2aa58b006f1a 100644
--- a/drivers/core/fdtaddr.c
+++ b/drivers/core/fdtaddr.c
@@ -19,11 +19,10 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-fdt_addr_t devfdt_get_addr_index(const struct udevice *dev, int index)
+#if CONFIG_IS_ENABLED(OF_REAL) || CONFIG_IS_ENABLED(OF_CONTROL)
+fdt_addr_t devfdt_get_addr_index_parent(const struct udevice *dev, int index,
+					int offset, int parent)
 {
-#if CONFIG_IS_ENABLED(OF_REAL)
-	int offset = dev_of_offset(dev);
-	int parent = fdt_parent_offset(gd->fdt_blob, offset);
 	fdt_addr_t addr;
 
 	if (CONFIG_IS_ENABLED(OF_TRANSLATE)) {
@@ -89,6 +88,15 @@ fdt_addr_t devfdt_get_addr_index(const struct udevice *dev, int index)
 #endif
 
 	return addr;
+}
+#endif
+
+fdt_addr_t devfdt_get_addr_index(const struct udevice *dev, int index)
+{
+#if CONFIG_IS_ENABLED(OF_REAL)
+	int offset = dev_of_offset(dev);
+	int parent = fdt_parent_offset(gd->fdt_blob, offset);
+	return devfdt_get_addr_index_parent(dev, index, offset, parent);
 #else
 	return FDT_ADDR_T_NONE;
 #endif
@@ -113,14 +121,16 @@ fdt_addr_t devfdt_get_addr_size_index(const struct udevice *dev, int index,
 	 * next call to the exisiting dev_get_xxx function which handles
 	 * all config options.
 	 */
-	fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, dev_of_offset(dev),
-					   "reg", index, size, false);
+	int offset = dev_of_offset(dev);
+	int parent = fdt_parent_offset(gd->fdt_blob, offset);
+	fdtdec_get_addr_size_auto_parent(gd->fdt_blob, parent, offset,
+					 "reg", index, size, false);
 
 	/*
 	 * Get the base address via the existing function which handles
 	 * all Kconfig cases
 	 */
-	return devfdt_get_addr_index(dev, index);
+	return devfdt_get_addr_index_parent(dev, index, offset, parent);
 #else
 	return FDT_ADDR_T_NONE;
 #endif
-- 
2.45.2