TAS2521: Unused output pin

Part Number:TAS2521

Hello,

Regarding to unused pin in TAS2521,I have a question.

My customer won’t use the following pin.

HPOUT(5pin)

MISO(17pin)

GPIO/DOUT(18pin)

Which is best connection at TAS2521? (Open OK?)

Could you please give comment or advice about it?

Regards,

Tao_2199