mux_control_select
ret = mux_control_select(mux->control, chan);
ret = mux_control_select(control, 1);
ret = mux_control_select(s->muxc, desired_child);
ret = mux_control_select(am654_phy->control, args->args[1]);
ret = mux_control_select(priv->mux, spi_get_chipselect(spi, 0));