We have a control unit used in marine applications running of 12V nominal voltage with a current consumption of about 1A.
Today we are using a P-Channel MOSFET with some added circuitry (Zener, capacitors and a resistor) as polarity protection.
We want to implement a good power ORing solution and without adding to much cost we were thinking to use the exact same circuit for the second power input.
There are much litterature on using N-channel MOSFETS instead for lower RDs on etc. But since we now have a good tested solution using P-channel we want to try and reuse this as much as possible.
See picture for schematic.
EDIT: After reviewing the feedback on this post we have taken the solution in a slightly different direction to a Smart Diode Controller controlling an N-Channel MOSFET. This effectively shuts down the MOSFET in a reverse voltage scenario.