dt: add of_alias_scan and of_alias_get_id

The patch adds function of_alias_scan to populate a global lookup
table with the properties of 'aliases' node and function
of_alias_get_id for drivers to find alias id from the lookup table.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
[grant.likely: add locking and rework parse loop]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 65200af29c52..13d6d3a96b31 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -707,10 +707,12 @@ void __init unflatten_device_tree(void)
         __unflatten_device_tree(initial_boot_params, &allnodes,
                                 early_init_dt_alloc_memory_arch);
 
-        /* Get pointer to OF "/chosen" node for use everywhere */
+        /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
         of_chosen = of_find_node_by_path("/chosen");
         if (of_chosen == NULL)
                 of_chosen = of_find_node_by_path("/chosen@0");
+        of_aliases = of_find_node_by_path("/aliases");
+        of_alias_scan();
 }
 
 #endif /* CONFIG_OF_EARLY_FLATTREE */