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fdt: introduce fdtdec_get_child_count

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Introduce fdtdec_get_child_count for get the number of subnodes
of one parent node.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Peng Fan 2016-02-01 13:31:15 +08:00 committed by Anatolij Gustschin
parent c4a45d4bdd
commit 1889a7e275
2 changed files with 20 additions and 0 deletions
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9
include/fdtdec.h
View File

@ -722,6 +722,15 @@ const u32 *fdtdec_locate_array(const void *blob, int node,
*/
int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
/*
* Count child nodes of one parent node.
*
* @param blob FDT blob
* @param node parent node
* @return number of child node; 0 if there is not child node
*/
int fdtdec_get_child_count(const void *blob, int node);
/**
* Look in the FDT for a config item with the given name and return its value
* as a 32-bit integer. The property must have at least 4 bytes of data. The

11
lib/fdtdec.c
View File

@ -831,6 +831,17 @@ int fdtdec_parse_phandle_with_args(const void *blob, int src_node,
return rc;
}
int fdtdec_get_child_count(const void *blob, int node)
{
int subnode;
int num = 0;
fdt_for_each_subnode(blob, subnode, node)
num++;
return num;
}
int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
u8 *array, int count)
{