Support for Hynitron Microelectronics CST826 capacitive touch

[lboue]

Describe the problem you have/What new integration you would like

Support for Hynitron Microelectronics CST826 capacitive touch

Please describe your use case for this integration and alternatives you've tried:

Used in folowing boards screens:

• Adafruit Round RGB 666 TTL TFT Display - 2.1" 480x480 - Capacitive Touch
• MaTouch ESP32 S3 2.1 Rotary TFT with Touch

Additional context

There is ESPHome support for cst816 Touch Screen Controller:

This controller is used in the Lilygo T-Display S3 AMOLED. The component should work with CST816T, CST816S, CST820 and CST716 controller chips.

It was added in this PR: Add CST816 touchscreen driver #5941

But not yet for CST826:

• CST826 Data sheet. High performance self-capacitance touch chip

I've only found these bookshops for the moment as examples:

• Adafruit CST8XX Library - Arduino Reference
• Adafruit CST8xx capacitive touch driver for CircuitPython

Schematics

• MaTouch-ESP32-S3-Rotary-IPS-Display-with-Touch-2.1 schematic