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Where are the pad configuration fields documented?

I'm developing an application on a Teensy 4.0 using the arm cortex m7 processor that incorporates imxrt1060 functionality. In order to set the pad to support a i2C port I need some detailed information  on the fields used to define the pad configuration..

The statement I need to configure is

#define PAD_CONFIG IOMUXC_PAD_DSE(4) | IOMUXC_PAD_SPEED(1) | IOMUXC_PAD_PKE | IOMUXC_PAD_PUE | IOMUXC_PAD_PUS(3) | IOMUXC_PAD_ODE | IOMUXC_PAD_HYS

I've searched and can't find detailed information on fields like DSE, SPEED, and PUS. What do the subscripts mean? What do the PKE, PUE, PUS fields mean and now should they be set when using an external pull up resistor. I'm sure that these values are documented. I just can't find where. Any help would be appreciated.