arm64: imx: Add support for imx8mp-beacon-kit

Beacon Embedded has an i.MX8M Plus development kit which consists
of a SOM + baseboard.  The SOM includes Bluetooth, WiFi, QSPI, eMMC,
and one Ethernet PHY. The baseboard includes audio, HDMI, USB-C Dual
Role port, USB Hub with five ports, a PCIe slot, and a second Ethernet
PHY.  The device trees are already queued for inclusion in Linux 6.3.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/doc/board/beacon/beacon-imx8mp.rst b/doc/board/beacon/beacon-imx8mp.rst
new file mode 100644
index 0000000..375931c
--- /dev/null
+++ b/doc/board/beacon/beacon-imx8mp.rst
@@ -0,0 +1,52 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+U-Boot for the Beacon EmbeddedWorks i.MX8M Plus Devkit
+======================================================
+
+Quick Start
+-----------
+
+- Build the ARM Trusted firmware binary
+- Get DDR firmware
+- Build U-Boot
+- Burn U-Noot to microSD Card
+- Boot
+
+Get and Build the ARM Trusted firmware
+--------------------------------------
+
+.. code-block:: bash
+
+    $ git clone https://github.com/nxp-imx/imx-atf.git -b v2.6
+    $ make PLAT=imx8mp bl31 CROSS_COMPILE=aarch64-linux-gnu-
+    $ cp build/imx8mn/release/bl31.bin ../
+
+Get the DDR firmware
+--------------------
+
+.. code-block:: bash
+
+    $ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.15.bin
+    $ chmod +x firmware-imx-8.15.bin
+    $ ./firmware-imx-8.15
+    $ cp firmware-imx-8.15/firmware/ddr/synopsys/lpddr4*.bin .
+
+Build U-Boot
+------------
+
+.. code-block:: bash
+
+    $ make imx8mp_beacon_defconfig
+    $ make CROSS_COMPILE=aarch64-linux-gnu-
+
+Burn U-Boot to microSD Card
+---------------------------
+
+.. code-block:: bash
+
+    $ sudo dd if=flash.bin of=/dev/sd[x] bs=1024 seek=32
+
+Boot
+----
+Set baseboard DIP switch:
+S17: 1100XXXX
diff --git a/doc/board/beacon/index.rst b/doc/board/beacon/index.rst
new file mode 100644
index 0000000..1fe1046
--- /dev/null
+++ b/doc/board/beacon/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Beacon
+======
+
+.. toctree::
+   :maxdepth: 2
+
+   beacon-imx8mp
diff --git a/doc/board/index.rst b/doc/board/index.rst
index 618d22e..69e2cd5 100644
--- a/doc/board/index.rst
+++ b/doc/board/index.rst
@@ -14,6 +14,7 @@
    apple/index
    armltd/index
    atmel/index
+   beacon/index
    broadcom/index
    bsh/index
    cloos/index