jerpelea opened a new pull request, #21276:
URL: https://github.com/apache/nuttx/pull/21276

   ## Summary
   
   With CONFIG_ETH0_PHY_MULTI, the YT8512 specific initialization in 
imxrt_initphy() was executed for every PHY except the YT8512, because the 
imxrt_phy_is() test was inverted.  On a LAN8720 it writes to registers 30/31 
(interrupt mask and special control/status), clearing the 4B5B enable bit and 
breaking 100BASE-TX.  Only run it when the detected PHY is a YT8512.
   
   imxrt_phyintenable() returned -ENOSYS for the LAN8720/LAN8742A, so 
SIOCMIINOTIFY (used by the NETINIT link monitor) failed on boards using these 
PHYs.  Enable the link down and auto-negotiation complete interrupts on them, 
both when selected at compile time and at run time with CONFIG_ETH0_PHY_MULTI.
   
   ## Impact
   
   RELEASE
   
   ## Testing
   
   CI


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