sunxi_ccu_phase_get_parent_rate
p_rate = sunxi_ccu_phase_get_parent_rate(clkp);
gp_rate = sunxi_ccu_phase_get_parent_rate(clk_get_parent(clkp));
p_rate = sunxi_ccu_phase_get_parent_rate(clkp);
gp_rate = sunxi_ccu_phase_get_parent_rate(clk_get_parent(clkp));