dm: core: ofnode: Avoid multiple calls to ofnode_get_parent()
Until a live tree is used in U-Boot proper after relocation, use of
ofnode_get_parent() will trigger a call to the very expensive
fdt_parent_offset() 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 node.
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index 4d563b4..7e3b371 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -762,8 +762,9 @@
return of_read_number(prop_val, na);
}
} else {
- na = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
- ns = ofnode_read_simple_size_cells(ofnode_get_parent(node));
+ ofnode parent = ofnode_get_parent(node);
+ na = ofnode_read_simple_addr_cells(parent);
+ ns = ofnode_read_simple_size_cells(parent);
return fdtdec_get_addr_size_fixed(ofnode_to_fdt(node),
ofnode_to_offset(node), "reg",
index, na, ns, size,