hw/omnia: Add page about Omnia add-ons, add LTE setup guide

It adds a page about two Omnia add-ons (LTE kit and Wi-Fi 6 upgrade kit)
and a guide for LTE kit setup.

Author: Filip Hron

docs/geek/lte/index.md

@@ -0,0 +1,60 @@
+---
+board: omnia, mox
+competency: advanced
+---
+
+# LTE connection setup
+
+!!! warning
+    This manual is intended to be used with the modem we provide in retail as
+    a part of the LTE kit. In case you use any other modem ePCIe card this
+    might not apply.
+
+## Prerequisties
+
+### Support packages and drivers
+
+For the modem to work, we first need to install drivers and utilities.
+
+| Component             | Description                                                                       |
+|-----------------------|-----------------------------------------------------------------------------------|
+| kmod-usb-net-qmi-wwan | QMI WWAN driver for Qualcomm MSM based 3G and LTE modems.                         |
+| libqmi                | Helper library talk to QMI enabled modems. Add qmi-utils for extra utilities.     |
+| uqmi                  | Command line tool for controlling mobile broadband modems using the QMI-protocol. |
+
+We can do it simply in CLI (via ssh) using the following commands:
+
+```shell
+opkg update
+opkg install kmod-usb-net-qmi-wwan libqmi uqmi luci-proto-qmi
+```
+
+## UCi setup
+
+First we need to determine if the settings are on place.
+
+```shell
+uci show network.LTE
+```
+
+Standard settings (common for most configurations)
+
+```shell
+network.LTE=interface
+network.LTE.pincode='0000'
+network.LTE.proto='qmi'
+network.LTE.device='/dev/cdc-wdm0'
+network.LTE.auth='none'
+network.LTE.apn='internet'
+network.LTE.pdptype='ipv4'
+```
+
+The setting ``network.LTE.apn`` depends on your mobile network operator.
+
+### Footnote
+
+Some mobile operators require additional authentication setup with
+
+- auth type (NONE/PAP/CHAP)
+- username
+- password

docs/hw/omnia/add-ons/index.md

@@ -0,0 +1,41 @@
+---
+board: omnia
+---
+
+# Turris Omnia add-ons
+
+Omnia is a very powerful device in and of itself. You may find the add-ons very
+useful when your network requirements are higher than what is in standard
+versions.
+
+## Turris Omnia LTE kit
+
+!!! info
+    It is not yet possible to setup LTE in the reForis GUI, however you are
+    able to use the below manual to set it up over ssh.
+
+In order to use LTE, you need to equip your Omnia with an LTE modem.
+Turris Omnia LTE kit is based on the miniPCI card with modem chip Quectel EP06,
+so an LTE module category 6 optimized for M2M and IoT applications. It provides
+maximum of 300 Mb/s downlink and 50 Mb/s uplink speeds.
+
+![Turris Omnia LTE kit](turris-omnia-lte-upgrade-kit.jpg)
+
+You will find the guide on how to setup the LTE connection
+over [here](../../../geek/lte/index.md).
+
+## Turris Omnia Wi-Fi 6 upgrade kit
+
+!!! info
+    The Turris Omnia Wi-Fi 6 upgrade kit can be used to upgrade Turris Omnia
+    routers manufactured since 2016. It can be used in all models – Omnia
+    1GB, Omnia 2GB, Omnia 2019, and Omnia 2020.
+
+![Turris Omnia Wi-Fi 6 Upgrade kit](turris-omnia-wifi-6-upgrade-kit.jpg)
+
+The kit is based on Dual Band WiFi 6 card AW7915-NP1,
+miniPCI-e bus with 4× u.Fl connectors, WPA2 encryption support,
+modulation speed 2401 Mbps in the 5GHz band (4×4 MU-MIMO)
+or 574 Mbps in the 2,4GHz band (2×2 MU-MIMO).
+This kit comes also with a special cover with special holes for additional
+antennas, longer pigtails, and an extra antenna.

docs/hw/omnia/add-ons/turris-omnia-lte-upgrade-kit.jpg

@@ -230,6 +230,7 @@ nav:
       - Omnia:
           - About: hw/omnia/omnia.md
           - Revisions: hw/omnia/revisions.md
+          - Add-ons: hw/omnia/add-ons/index.md
           - Boot from SSD: hw/omnia/ssd-boot.md
           - GPIO: hw/omnia/gpio.md
       - Shield: