Can output pin withstand any reverse voltage/current?

[Sudip]

Hi,
In my application I need to drive a stepper motor and depending on the speed of stepper motor the device that generates the drive signal is selectable. Out1 is from rpi for very low speeds and Out2 is from an arduino. Only one of the output pin will be used in any instance. Will the following circuit protect the pin in output mode on rpi assuming the reverse voltage is around 700mV in the diode.
Thank you in Advance
Sudip