ADAU1787 can I have the PLL in power-down mode if PLL_BYPASS=1?

I plan to bring in my own 24.576MHz MCLK to the ADAU1787and I see in the PLL_MB_PGA_PWR register a PLL_EN bit for PLL power. 

If I have the PLL_BYPASS=1, do I still have to enable PLL power?

Thanks,

Dan