This flag is a no-op now (see commit 
47b0eeb3dc8a "clk: Deprecate
CLK_IS_ROOT", 2016-02-02) so remove it.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
 
        of_property_read_string(np, "clock-output-names", &clk_name);
 
-       clk = clk_register_fixed_rate(dev, clk_name, parent_clk_name,
-                                     (parent_clk_name) ? 0 : CLK_IS_ROOT,
-                                     rate);
+       clk = clk_register_fixed_rate(dev, clk_name, parent_clk_name, 0, rate);
        if (!IS_ERR(clk))
                of_clk_add_provider(np, of_clk_src_simple_get, clk);