How to force USB device into SPI mode?

Not quite sure where to ask this, but I have a Macbook Pro 12,1; which has the controller that can operate both in USB and SPI modes. SPI seems superior to me (higher throughput, no USB polling et) but I have no idea how to 'switch' to it. The code says ACPI can be used to switch between the various implementations, but doesn't tell me 'how' this can be done.

Any insights?