I understand from the datasheet that the IO voltage of the WP modules are determined by VDD_PX and that various levels like 1.2V, 1.8V etc. are possible. But there is no clear info as to how VDD_PX can be configured to a particular voltage. In our case, we need 1.8V IOs.
Also there is no clear answer as to what the capabilities and limitations of each interface is. Mostly we are using USB. But there is no clear info on what UART/SDIO/I2C can do or cannot do.