clk_get_by_ofw_index_prop
rv = clk_get_by_ofw_index_prop(dev, 0,
rv = clk_get_by_ofw_index_prop(dev, 0, "assigned-clocks",
return (clk_get_by_ofw_index_prop(dev, cnode, "clocks", idx, clk));
int clk_get_by_ofw_index_prop(device_t dev, phandle_t cnode, const char *prop, int idx, clk_t *clk);