clk_reparent
clk_reparent(core, parent);
clk_reparent(core, old_parent);
clk_reparent(core, new_parent);
ret = clk_reparent(clk, parent);
clk_reparent(clk, clk->parent_table[val]);
ret = clk_reparent(clk, parent);
ret = clk_reparent(clk, parent);
int clk_reparent(struct clk *child, struct clk *parent);