diff options
| author | Simon Glass <sjg@chromium.org> | 2012-02-03 15:13:53 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-03-29 08:12:49 +0200 |
| commit | c67822704b73dcfb86debf4c25151e43309af844 (patch) | |
| tree | 1ed8997f2f8f023fa3ddf2a244c69ba5434deddd /lib | |
| parent | f4589a7d6f477876c18eb8087e3ee7fa0a8655ca (diff) | |
| download | u-boot-c67822704b73dcfb86debf4c25151e43309af844.tar.gz | |
fdt: Add function to allow aliases to refer to multiple nodes
Some devices can deal with multiple compatible properties. The devices
need to know which nodes to bind to which features. For example an
I2C driver which supports two different controller types will want to
know which type it is dealing with in each case.
The new fdtdec_add_aliases_for_id() function deals with this by allowing
the driver to search for additional compatible nodes for a different ID.
It can then detect the new ones and perform appropriate processing.
Another option considered was to return a tuple (node offset, compat id)
and have the function be passed a list of compatible IDs. This is more
overhead for the common case though. We may add such a function later if
more drivers in U-Boot require it.
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/fdtdec.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 5239e79479..2149bd7068 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -153,10 +153,18 @@ int fdtdec_next_alias(const void *blob, const char *name, return node; } -/* TODO: Can we tighten this code up a little? */ int fdtdec_find_aliases_for_id(const void *blob, const char *name, enum fdt_compat_id id, int *node_list, int maxcount) { + memset(node_list, '\0', sizeof(*node_list) * maxcount); + + return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); +} + +/* TODO: Can we tighten this code up a little? */ +int fdtdec_add_aliases_for_id(const void *blob, const char *name, + enum fdt_compat_id id, int *node_list, int maxcount) +{ int name_len = strlen(name); int nodes[maxcount]; int num_found = 0; @@ -185,8 +193,6 @@ int fdtdec_find_aliases_for_id(const void *blob, const char *name, __func__, name); /* Now find all the aliases */ - memset(node_list, '\0', sizeof(*node_list) * maxcount); - for (offset = fdt_first_property_offset(blob, alias_node); offset > 0; offset = fdt_next_property_offset(blob, offset)) { @@ -233,11 +239,19 @@ int fdtdec_find_aliases_for_id(const void *blob, const char *name, * it as done. */ if (fdtdec_get_is_enabled(blob, node)) { + if (node_list[number]) { + debug("%s: warning: alias '%s' requires that " + "a node be placed in the list in a " + "position which is already filled by " + "node '%s'\n", __func__, path, + fdt_get_name(blob, node, NULL)); + continue; + } node_list[number] = node; if (number >= num_found) num_found = number + 1; } - nodes[j] = 0; + nodes[found] = 0; } /* Add any nodes not mentioned by an alias */ |