As Kelvin describes (and without my looking at the specs of the devices), that should work. Usually, the only things special about "uplink" ports are they often might ofter more bandwidth than other ports, they might offer for Ethernet the option to use a straight thru cable vs. cross over. They sometimes offer additional software features not found on other ports.
Your configuration is sometimes known as a "star" configuration, and it's often the preferred configuration.
PS:
Some variations would be to use the second uplink port on the leaf switches with to another top switch which connects to the top switch (avoids failure of the one top switch stopping your whole network), or using both uplink ports to the same top switch in some kind of Etherchannel configuration (if supported on both switches).
