Hi John,
There is no specific value for a single GPIO current value. It should be calculated considering all the GPIOs currents from NVCC_GPIO rail, as mentioned on Note 5 of Table 13 “Maximum Supply Currents” of i.MX6ULL Datasheet, available at the following link:
http://www.nxp.com/docs/en/data-sheet/IMX6ULLIEC.pdf
You could also take a look at the following Community threads:
https://community.nxp.com/thread/385130
https://community.nxp.com/thread/322294
Hope this will be useful for you.
Best regards!
/Carlos
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