TLV320AIC3204: Should SCLK / MFP3 be grounded if I don't use it for SPI or otherwise?

Tool/software:

Hello forum,

As title says. The datasheet details how analog inputs outputs should be handled if not needed, but it's a digital IO pin. Can SCLK / MFP3 be left floating, or do I need to ground it? 

Thanks,
Mark