docs: Add quickref and docs for mimxrt, including network.LAN docs.

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diff --git a/docs/library/network.LAN.rst b/docs/library/network.LAN.rst
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+.. currentmodule:: network
+.. _network.LAN:
+
+class LAN -- control an Ethernet module
+=======================================
+
+This class allows you to control the Ethernet interface. The PHY hardware type is board-specific.
+
+Example usage::
+
+    import network
+    nic = network.LAN(0)
+    print(nic.ifconfig())
+
+    # now use socket as usual
+    ...
+
+
+Constructors
+------------
+
+.. class:: LAN(id, *, phy_type=<board_default>, phy_addr=<board_default>, phy_clock=<board_default>)
+
+   Create a LAN driver object, initialise the LAN module using the given
+   PHY driver name, and return the LAN object.
+
+   Arguments are:
+
+     - *id* is the number of the Ethernet port, either 0 or 1.
+     - *phy_type* is the name of the PHY driver. For most board the on-board PHY has to be used and
+       is the default. Suitable values are port specific.
+     - *phy_addr* specifies the address of the PHY interface. As with *phy_type*, the hardwired value has
+       to be used for most boards and that value is the default.
+     - *phy_clock* specifies, whether the data clock is provided by the Ethernet controller or the PYH interface.
+       The default value is the one that matches the board. If set to ``True``, the clock is driven by the
+       Ethernet controller, otherwise by the PHY interface.
+
+   For example, with the Seeed Arch Mix board you can  use::
+
+     nic = LAN(0, phy_type=LAN.PHY_LAN8720, phy_addr=2, phy_clock=False)
+
+Methods
+-------
+
+.. method:: LAN.active([state])
+
+   With a parameter, it sets the interface active if *state* is true, otherwise it
+   sets it inactive.
+   Without a parameter, it returns the state.
+
+.. method:: LAN.isconnected()
+
+   Returns ``True`` if the physical Ethernet link is connected and up.
+   Returns ``False`` otherwise.
+
+.. method:: LAN.status()
+
+   Returns the LAN status.
+
+.. method:: LAN.ifconfig([(ip, subnet, gateway, dns)])
+
+   Get/set IP address, subnet mask, gateway and DNS.
+
+   When called with no arguments, this method returns a 4-tuple with the above information.
+
+   To set the above values, pass a 4-tuple with the required information.  For example::
+
+    nic.ifconfig(('192.168.0.4', '255.255.255.0', '192.168.0.1', '8.8.8.8'))
+
+.. method:: LAN.config(config_parameters)
+
+   Sets or gets parameters of the LAN interface. The only parameter that can be
+   retrieved is the MAC address, using::
+
+      mac = LAN.config("mac")
+
+   The parameters that can be set are:
+
+    - ``trace=n`` sets trace levels; suitable values are:
+
+        - 2: trace TX
+        - 4: trace RX
+        - 8: full trace
+
+    - ``low_power=bool`` sets or clears low power mode, valid values being ``False``
+      or ``True``.
+
+
+Specific LAN class implementations
+----------------------------------
+
+On the mimxrt port, suitable values for the *phy_type* constructor argument are:
+``PHY_KSZ8081``, ``PHY_DP83825``, ``PHY_DP83848``, ``PHY_LAN8720``, ``PHY_RTL8211F``.