nuttx/Documentation/components/drivers/special/ethernet.rst

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Ethernet Device Drivers
=======================
- ``include/nuttx/net/netdev.h``. All structures and APIs
needed to work with Ethernet drivers are provided in this
header file. The structure ``struct net_driver_s`` defines the
interface and is passed to the network via
``netdev_register()``.
- ``int netdev_register(FAR struct net_driver_s *dev, enum net_lltype_e lltype);``.
Each Ethernet driver registers itself by calling
``netdev_register()``.
- **Examples**: ``drivers/net/dm90x0.c``,
``arch/drivers/arm/src/c5471/c5471_ethernet.c``,
``arch/z80/src/ez80/ez80_emac.c``, etc.