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Index: sys/dev/ofw/ofw_bus_subr.h
===================================================================
--- sys/dev/ofw/ofw_bus_subr.h
+++ sys/dev/ofw/ofw_bus_subr.h
@@ -118,6 +118,8 @@
int ofw_bus_parse_xref_list_alloc(phandle_t node, const char *list_name,
const char *cells_name, int idx, phandle_t *producer, int *ncells,
pcell_t **cells);
+int ofw_bus_parse_xref_list_get_length(phandle_t node, const char *list_name,
+ const char *cells_name, int *count);
int ofw_bus_find_string_index(phandle_t node, const char *list_name,
const char *name, int *idx);
int ofw_bus_string_list_to_array(phandle_t node, const char *list_name,
Index: sys/dev/ofw/ofw_bus_subr.c
===================================================================
--- sys/dev/ofw/ofw_bus_subr.c
+++ sys/dev/ofw/ofw_bus_subr.c
@@ -629,13 +629,16 @@
* node - consumers device node
* list_name - name of parsed list - "clocks"
* cells_name - name of size property - "#clock-cells"
+ * idx - the index of the requested list entry, or, if -1, an indication
+ * to return the number of entries in the parsed list.
* Output arguments:
* producer - handle of producer
- * ncells - number of cells in result
+ * ncells - number of cells in result or the number of items in the list when
+ * idx == -1.
* cells - array of decoded cells
*/
-int
-ofw_bus_parse_xref_list_alloc(phandle_t node, const char *list_name,
+static int
+ofw_bus_parse_xref_list_internal(phandle_t node, const char *list_name,
const char *cells_name, int idx, phandle_t *producer, int *ncells,
pcell_t **cells)
{
@@ -649,7 +652,7 @@
(void **)&elems);
if (nelems <= 0)
return (ENOENT);
- rv = ENOENT;
+ rv = (idx == -1) ? 0 : ENOENT;
for (i = 0, cnt = 0; i < nelems; i += pcells, cnt++) {
pnode = elems[i++];
if (OF_getencprop(OF_node_from_xref(pnode),
@@ -678,10 +681,58 @@
}
if (elems != NULL)
free(elems, M_OFWPROP);
+ if (idx == -1 && rv == 0)
+ *ncells = cnt;
return (rv);
}
/*
+ * Parse property that contain list of xrefs and values
+ * (like standard "clocks" and "resets" properties)
+ * Input arguments:
+ * node - consumers device node
+ * list_name - name of parsed list - "clocks"
+ * cells_name - name of size property - "#clock-cells"
+ * idx - the index of the requested list entry (>= 0)
+ * Output arguments:
+ * producer - handle of producer
+ * ncells - number of cells in result
+ * cells - array of decoded cells
+ */
+int
+ofw_bus_parse_xref_list_alloc(phandle_t node, const char *list_name,
+ const char *cells_name, int idx, phandle_t *producer, int *ncells,
+ pcell_t **cells)
+{
+
+ KASSERT(idx >= 0,
+ ("ofw_bus_parse_xref_list_alloc: negative index supplied"));
+
+ return (ofw_bus_parse_xref_list_internal(node, list_name, cells_name,
+ idx, producer, ncells, cells));
+}
+
+/*
+ * Parse property that contain list of xrefs and values
+ * (like standard "clocks" and "resets" properties)
+ * and determine the number of items in the list
+ * Input arguments:
+ * node - consumers device node
+ * list_name - name of parsed list - "clocks"
+ * cells_name - name of size property - "#clock-cells"
+ * Output arguments:
+ * count - number of items in list
+ */
+int
+ofw_bus_parse_xref_list_get_length(phandle_t node, const char *list_name,
+ const char *cells_name, int *count)
+{
+
+ return (ofw_bus_parse_xref_list_internal(node, list_name, cells_name,
+ -1, NULL, count, NULL));
+}
+
+/*
* Find index of string in string list property (case sensitive).
*/
int

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