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TM4C1294KCPDT: Ethernet PHY clocking

Part Number: TM4C1294KCPDT


Hi!

as I understood, the Ethernet PHY requires a 25MHz external clock source to work and cannot be clocked trough the system clock, but in the datasheet, at the system clock schematic, I also noticed that there is an another clock source coming from GPIO (maybe PM4).

The question is: Is it a valid source? can the PHY getting work by attaching a 25MHz signal to the PM4? Maybe generating trough an internal timer...

Regards