Import the Linux helper of_property_match_string. This function searches
a string list property and returns the index of a specific string value.
Signed-off-by: Rahul Singh <rahul.si...@arm.com>
---
Changes in v3:
- This patch is introduce in this verison.
---
xen/common/device_tree.c | 27 +++++++++++++++++++++++++++
xen/include/xen/device_tree.h | 12 ++++++++++++
2 files changed, 39 insertions(+)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index e107c6f89f..18825e333e 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -208,6 +208,33 @@ int dt_property_read_string(const struct dt_device_node
*np,
return 0;
}
+int dt_property_match_string(const struct dt_device_node *np,
+ const char *propname, const char *string)
+{
+ const struct dt_property *dtprop = dt_find_property(np, propname, NULL);
+ size_t l;
+ int i;
+ const char *p, *end;
+
+ if ( !dtprop )
+ return -EINVAL;
+ if ( !dtprop->value )
+ return -ENODATA;
+
+ p = dtprop->value;
+ end = p + dtprop->length;
+
+ for ( i = 0; p < end; i++, p += l )
+ {
+ l = strnlen(p, end - p) + 1;
+ if ( p + l > end )
+ return -EILSEQ;
+ if ( strcmp(string, p) == 0 )
+ return i; /* Found it; return index */
+ }
+ return -ENODATA;
+}
+
bool_t dt_device_is_compatible(const struct dt_device_node *device,
const char *compat)
{
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index f2ad22b79c..b02696be94 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -400,6 +400,18 @@ static inline bool_t dt_property_read_bool(const struct
dt_device_node *np,
int dt_property_read_string(const struct dt_device_node *np,
const char *propname, const char **out_string);
+/**
+ * dt_property_match_string() - Find string in a list and return index
+ * @np: pointer to node containing string list property
+ * @propname: string list property name
+ * @string: pointer to string to search for in string list
+ *
+ * This function searches a string list property and returns the index
+ * of a specific string value.
+ */
+int dt_property_match_string(const struct dt_device_node *np,
+ const char *propname, const char *string);
+
/**
* Checks if the given "compat" string matches one of the strings in
* the device's "compatible" property
--
2.17.1
