SMUX_INDEX
parent = clk_hw_get_parent_by_index(hw, SMUX_INDEX);
[SMUX_INDEX] = &pwrcl_smux.clkr.hw,
[SMUX_INDEX] = &perfcl_smux.clkr.hw,
clk_cpu_8996_pmux_set_parent(&cpuclk->clkr.hw, SMUX_INDEX);