dss_ctrl_pll_set_control_mux
r = dss_ctrl_pll_set_control_mux(dss, clk_src, channel);
dss_ctrl_pll_set_control_mux(pll->id, dpi->output.dispc_channel);
void dss_ctrl_pll_set_control_mux(enum dss_pll_id pll_id,