Support for Waveshare-ESP32-S3-Touch-LCD-3.5B-C

Proposed board support: Waveshare ESP32-S3-Touch-LCD-3.5B-C

I have tested Tessera on a physical Waveshare ESP32-S3-Touch-LCD-3.5B-C (320×480 portrait, ESP32-S3, AXS15231B LCD and touch). This is not the existing waveshare35 hardware (ST7796 / FT6336).

Using the existing waveshare35 profile with a local Override YAML, Tessera successfully displays its UI, navigates between two pages by touch, connects to Home Assistant, and controls a real HA switch (switch.grillplats_plug). This was also tested from a USB power bank.

Working hardware configuration:

• LCD: mipi_spi model WAVESHARE-ESP32-S3-TOUCH-LCD-3.5B
• Bus: quad SPI, CLK GPIO5, DATA GPIO1/GPIO2/GPIO3/GPIO4
• Backlight: LEDC PWM GPIO6 (already correct in waveshare35)
• Touch: axs15231, I²C SDA GPIO8, SCL GPIO7 (same I²C pins as existing waveshare35)
• LVGL: full_refresh: true and buffer_size: 100% are essential. Without them the bottom page selector was visible but most of the display showed colour noise.

The following is the override reconstructed from the successful experiments; it should be compared with the actual saved override before being attached as a definitive reproduction:

spi:
  id: lcd
  type: quad
  clk_pin: GPIO5
  mosi_pin: !remove
  miso_pin: !remove
  data_pins: [GPIO1, GPIO2, GPIO3, GPIO4]

display:
  - id: !extend my_display
    model: WAVESHARE-ESP32-S3-TOUCH-LCD-3.5B
    dc_pin: !remove
    cs_pin: !remove
    reset_pin: !remove
    color_order: !remove
    invert_colors: !remove
    spi_mode: 0

touchscreen:
  - id: !extend ts_touch
    platform: axs15231
    i2c_id: touch_bus
    display: my_display

lvgl:
  full_refresh: true
  buffer_size: 100%

This would be a useful dedicated board profile instead of requiring users to select incompatible waveshare35 hardware and apply an override. I can provide further testing on the physical device, including firmware updates, touch, Home Assistant actions, and weather/media tiles.

Suggested upstream workflow: request the board in Tessera's New boards wishlist category, then prepare a pull request linked to that request, following docs/ADDING_A_BOARD.md.