Backward Compatibility
USB OTG devices are backward-compatible with USB 2.0 (USB 3.0 for SuperSpeed OTG devices) and will behave as standard USB hosts or devices when connected to standard (non-OTG) USB devices. The main exception is that OTG hosts are only required to provide enough power for the products listed on the TPL, which may or may not be enough to connect to a peripheral which is not listed. A powered USB hub may sidestep the issue if supported since this will then provide its own power according to either the USB 2.0 or USB 3.0 specifications.
Some incompatibilities in both HNP and SRP were introduced between the 1.3 and 2.0 versions of the On-The-Go supplement which may lead to interoperability issues when using these protocols.
Read more about this topic: USB On-The-Go