There is a discrepancy about GPIO1 and GPIO1 of P1022 between its application note AN4343 and its datasheet and reference manual.
Datasheet and Reference Manual: The pin TSEC2_TX_CLK/USB2_CLK/TSEC2_GTX_CLK (Package pin number: AC26) is GPIO1_5:
Application Note (AN4343): The pin TSEC2_TX_CLK/USB2_CLK/TSEC2_GTX_CLK is GPIO1_:
Reference Manual again: The pins TSEC_1588_CLK_OUT and TSEC2_TX_CLK/USB2_CLK/TSEC2_GTX_CLK are both shown as GPIO1 in the figure of signal groupings:
But, the pin TSEC_1588_CLK_OUT's alternate function is given as GPO1 two pages after the figure:
My guess is:
TSEC2_TX_CLK/USB2_CLK/TSEC2_GTX_CLK -> GPIO1
TSEC_1588_CLK_OUT -> GPO1
Could you confirm?