matiamic opened a new pull request, #16911:
URL: https://github.com/apache/nuttx/pull/16911

   ## Summary
   This patch adds SIOCGMMDREG and SIOCSMMDREG ioctl commands with accompanying 
logic.
   SIOCGMMDREG: Get MMD register.
   SIOCGMMDREG: Set MMD register.
   A new structure `mmd_ioctl_data_s` is introduced into `include/net/if.h` in 
order to accommodate command data.
   MMD registers are an extension to the MII management interface, both are 
defined in IEEE 802.3.
   
   ## Impact
   Network drivers may implement these ioctl commands. When implemented, PHY 
features configurable by
   MMD access can now be managed from the user application.
   
   ## Testing
   The testing was performed by a testing application during development of a 
driver for 10BASE-T1x SPI MAC-PHYs.
   This mechanism was used to control PHY behavior, especially to configure 
10BASE-T1S PLCA access method.


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