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dt: add of_alias_scan and of_alias_get_id

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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.

v3: Split out automatic addition of aliases on id lookup so that it can be
    debated separately from the core functionality.
v2: - Add of_chosen/of_aliases populating and of_alias_scan() invocation
    for OF_PROMTREE.
    - Add locking
    - rework parse loop

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Shawn Guo
2011-08-15 15:28:14 +08:00
committed by Grant Likely
parent a81dd364de
commit 611cad7201
4 changed files with 138 additions and 4 deletions
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drivers/of/fdt.c
+2 -4
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@@ -707,10 +707,8 @@ 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 */
of_chosen = of_find_node_by_path("/chosen");
if (of_chosen == NULL)
of_chosen = of_find_node_by_path("/chosen@0");
/* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
of_alias_scan(early_init_dt_alloc_memory_arch);
}
#endif /* CONFIG_OF_EARLY_FLATTREE */