Index: sys/dev/extres/clk/clk.h
===================================================================
--- sys/dev/extres/clk/clk.h
+++ sys/dev/extres/clk/clk.h
@@ -131,6 +131,7 @@
 int clk_enable(clk_t clk);
 int clk_disable(clk_t clk);
 int clk_stop(clk_t clk);
+int clk_mux(clk_t clk, int index);
 int clk_get_parent(clk_t clk, clk_t *parent);
 int clk_set_parent_by_clk(clk_t clk, clk_t parent);
 const char *clk_get_name(clk_t clk);
Index: sys/dev/extres/clk/clk.c
===================================================================
--- sys/dev/extres/clk/clk.c
+++ sys/dev/extres/clk/clk.c
@@ -376,6 +376,8 @@
 		*clk = clknode_find_by_id(clkdom, 1);
 	else if (ncells == 1)
 		*clk = clknode_find_by_id(clkdom, cells[0]);
+	else if (ncells == 2)
+		*clk = clknode_find_by_id(clkdom, cells[0]);
 	else
 		return  (ERANGE);
 
@@ -1265,6 +1267,22 @@
 	CLK_TOPO_SLOCK();
 	rv = clknode_stop(clknode, 0);
 	CLK_TOPO_UNLOCK();
+	return (rv);
+}
+
+int
+clk_mux(clk_t clk, int index)
+{
+	int rv;
+	struct clknode *clknode;
+
+	clknode = clk->clknode;
+	KASSERT(clknode->ref_cnt > 0,
+	    ("Attempt to access unreferenced clock: %s\n", clknode->name));
+	CLK_TOPO_SLOCK();
+	rv = CLKNODE_SET_MUX(clknode, index);
+	CLK_TOPO_UNLOCK();
+
 	return (rv);
 }