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-rw-r--r--drivers/of/base.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 133908a6fd8d..13ba72875e25 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -761,6 +761,42 @@ int of_property_read_string_index(struct device_node *np, const char *propname,
761} 761}
762EXPORT_SYMBOL_GPL(of_property_read_string_index); 762EXPORT_SYMBOL_GPL(of_property_read_string_index);
763 763
764/**
765 * of_property_match_string() - Find string in a list and return index
766 * @np: pointer to node containing string list property
767 * @propname: string list property name
768 * @string: pointer to string to search for in string list
769 *
770 * This function searches a string list property and returns the index
771 * of a specific string value.
772 */
773int of_property_match_string(struct device_node *np, const char *propname,
774 const char *string)
775{
776 struct property *prop = of_find_property(np, propname, NULL);
777 size_t l;
778 int i;
779 const char *p, *end;
780
781 if (!prop)
782 return -EINVAL;
783 if (!prop->value)
784 return -ENODATA;
785
786 p = prop->value;
787 end = p + prop->length;
788
789 for (i = 0; p < end; i++, p += l) {
790 l = strlen(p) + 1;
791 if (p + l > end)
792 return -EILSEQ;
793 pr_debug("comparing %s with %s\n", string, p);
794 if (strcmp(string, p) == 0)
795 return i; /* Found it; return index */
796 }
797 return -ENODATA;
798}
799EXPORT_SYMBOL_GPL(of_property_match_string);
764 800
765/** 801/**
766 * of_property_count_strings - Find and return the number of strings from a 802 * of_property_count_strings - Find and return the number of strings from a