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fdt: Add functions to retrieve strings

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Given a device tree node, a property name and an index, the new function
fdt_get_string_index() will return in an output argument a pointer to
the index'th string in the property's value.

The fdt_get_string() is a shortcut for the above with the index being 0.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Thierry Reding 2014-08-26 17:33:52 +02:00 committed by Simon Glass
parent fc503c1791
commit 5094eb408a
2 changed files with 57 additions and 0 deletions
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27
include/libfdt.h
View File

@ -877,6 +877,33 @@ int fdt_count_strings(const void *fdt, int node, const char *property);
int fdt_find_string(const void *fdt, int node, const char *property,
const char *string);
/**
* fdt_get_string_index() - obtain the string at a given index in a string list
* @fdt: pointer to the device tree blob
* @node: offset of the node
* @property: name of the property containing the string list
* @index: index of the string to return
* @output: return location for the string
* @return: 0 if the string was found or a negative error code otherwise
*/
int fdt_get_string_index(const void *fdt, int node, const char *property,
int index, const char **output);
/**
* fdt_get_string() - obtain the string at a given index in a string list
* @fdt: pointer to the device tree blob
* @node: offset of the node
* @property: name of the property containing the string list
* @output: return location for the string
* @return: 0 if the string was found or a negative error code otherwise
*
* This is a shortcut for:
*
* fdt_get_string_index(fdt, node, property, 0, output).
*/
int fdt_get_string(const void *fdt, int node, const char *property,
const char **output);
/**********************************************************************/
/* Read-only functions (addressing related) */
/**********************************************************************/

30
lib/libfdt/fdt_ro.c
View File

@ -537,6 +537,36 @@ int fdt_find_string(const void *fdt, int node, const char *property,
return -FDT_ERR_NOTFOUND;
}
int fdt_get_string_index(const void *fdt, int node, const char *property,
int index, const char **output)
{
const char *list;
int length, i;
list = fdt_getprop(fdt, node, property, &length);
for (i = 0; i < length; i++) {
int len = strlen(list);
if (index == 0) {
*output = list;
return 0;
}
list += len + 1;
i += len;
index--;
}
return FDT_ERR_NOTFOUND;
}
int fdt_get_string(const void *fdt, int node, const char *property,
const char **output)
{
return fdt_get_string_index(fdt, node, property, 0, output);
}
int fdt_node_check_compatible(const void *fdt, int nodeoffset,
const char *compatible)
{