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AM625: PPS external signal configuration

Part Number: AM625

I am using ti-processor-sdk-linux-rt-am62xx-evm-

When I wanted to test the PTP pair using an external PPS signal source, I did not find the detailed description of "Time synchronization" in the 62X data manual, but after adding the following device nodes to the device tree file in the 64X user data manual, there was no PPS signal output in the test. Can you provide the device tree node related configuration or data for using external PPS signal source to test the PTP timing function?