AM3517 GPIO MAXIMUM FREQUENCY

Re:  Kshitij

On Technical Manual of AM3517:

Check: Table 21-2. Clocks

Each GPIO module uses two clocks:
1. Debounce clock:  32-KHz

2. Interface clock:
The interface clock, GPIOi_ICLK (where i = 1, 2, 3, 4, 5, and 6), comes from the PRCM module and is used throughout the GPIO module (except within the debounce cell logic). The interface clock clocks the data exchanges between the L4 interconnect and the internal logic. The clock-gating features allow module power consumption to be adapted to the activity.
For GPIO1, this clock is controlled by the EN_GPIO1 bit PRCM.CM_ICLKEN_WKUP[3] (0: disabled, 1:enabled the clock) and AUTO_GPIO1 bit PRCM.CM_AUTOIDLE_WKUP[3] (enables/disables automatic control of the interface clock). For GPIO2 to GPIO6, this clock is controlled by the EN_GPIOi ( where i = 2 to 6 ) bit PRCM.CM_ICLKEN_PER (0: disabled, 1: enabled the clock) and AUTO_GPIOi (where i = 2 to 6) bit PRCM.CM_AUTOIDLE_PER (enables/disables automatic control of the interfaceclock).