I'm using a MKV58 and observing the TRACE_CLKOUT. I found the divider enable in CLKDIV4 disables the output but the divisor appears to have no effect. I only see the fixed divide-by-2 applied to MCGOUTCLK. Are additional configuration steps required?
SIM->CLKDIV4 &= ~(SIM_CLKDIV4_TRACEDIV_MASK | SIM_CLKDIV4_TRACEFRAC_MASK);
SIM->CLKDIV4 |= (SIM_CLKDIV4_TRACEDIVEN_MASK | SIM_CLKDIV4_TRACEDIV(3U));