Hi Thinh
if these signals can not be found in dts, seems they are not used in particular bsp.
In general this depends on used bsp, as different vendors improve or add additional bsp capabilities
FSL Community BSP Release Notes 2.2 documentation
For example on below case ENET_TX_EN was used as wake on lan
https://community.nxp.com/message/959401?commentID=959401#comment-959401
Best regards
igor
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