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libfdt: add convenience function fdt_find_and_setprop()

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Given the path to a node, fdt_find_and_setprop() allows a property value
to be set directly.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely 2007-09-06 09:46:17 -06:00
parent 60174746c6
commit 41bb76e941
2 changed files with 28 additions and 0 deletions
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2
include/libfdt.h
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@ -140,6 +140,8 @@ int fdt_setprop(void *fdt, int nodeoffset, const char *name,
})
#define fdt_setprop_string(fdt, nodeoffset, name, str) \
fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
const void *val, int len, int create);
int fdt_delprop(void *fdt, int nodeoffset, const char *name);
int fdt_add_subnode_namelen(void *fdt, int parentoffset,
const char *name, int namelen);

26
libfdt/fdt_rw.c
View File

@ -188,6 +188,32 @@ int fdt_setprop(void *fdt, int nodeoffset, const char *name,
return 0;
}
/**
* fdt_find_and_setprop: Find a node and set it's property
*
* @fdt: ptr to device tree
* @node: path of node
* @prop: property name
* @val: ptr to new value
* @len: length of new property value
* @create: flag to create the property if it doesn't exist
*
* Convenience function to directly set a property given the path to the node.
*/
int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
const void *val, int len, int create)
{
int nodeoff = fdt_find_node_by_path(fdt, node);
if (nodeoff < 0)
return nodeoff;
if ((!create) && (fdt_get_property(fdt, nodeoff, prop, 0) == NULL))
return 0; /* create flag not set; so exit quietly */
return fdt_setprop(fdt, nodeoff, prop, val, len);
}
int fdt_delprop(void *fdt, int nodeoffset, const char *name)
{
struct fdt_property *prop;