diy: add support for Waveshare Touch LCD 3.5

[bota87]

Adds diy support for the Waveshare ESP32-S3-Touch-LCD-3.5 (esp32s3, 480x320 ST7796 display, FT6336 touch, AXP2101 pmu, and an OV5640 camera on the -C version). It follows the existing Touch LCD 2 support, with the same three virtual buttons along the bottom of the screen.

Tested on the hardware: display, touch, QR scanning, brightness, battery level and charging.

On this board the touch controller, the camera sccb and the pmu are all on the same two i2c pins, so the touchscreen owns the only bus on them and the pmu and the camera attach to it (the camera the same way as the T-Display S3 Pro). The camera.c changes only apply to this board.

The 3.5B variant uses a different (QSPI) display controller and is not supported (#243).

[jgriffiths]

Thanks - this may have to sit for a bit while we push the next release out. Will try to get to it soon, thanks.

[jgriffiths]

Thanks, looking good. This will need a rebase and testing on v5.5.5 when I push that to master in the next few hours.

For the touchscreen change I'll defer to @cateim and @oroderico to review when they get time, to make sure it doesn't break their touchscreen devices.

[bota87]

Rebased on master (IDF v5.5.5) and tested again on the hardware

[bota87]

I changed how the shared i2c pins are handled: the camera now reuses the touchscreen bus, so the camera.c change only applies to this board and there is nothing to check on other touchscreen devices anymore. Description updated.

[jgriffiths]

Looks good, I can merge once the below review comment is addressed thanks.

[cateim]

Thanks, looking good. This will need a rebase and testing on v5.5.5 when I push that to master in the next few hours.

For the touchscreen change I'll defer to @cateim and @oroderico to review when they get time, to make sure it doesn't break their touchscreen devices.

Thanks for the ping @jgriffiths. I don't have the Touch LCD 3.5, so I can't test the board itself, but I checked the current head (ff6f5ec) against master: resolving CONFIG_BOARD_TYPE_WS_TOUCH_LCD35 as unset, every shared file (camera.c, touchscreen.inc, display.h, display_hw.c, power.c, both dashboard.c, ota_defines.h and Kconfig.projbuild) comes out identical to master. So nothing changes for my Touch LCD 2 or any other touchscreen board, no objections from me.

One heads-up on rolling this into the CONFIG_BOARD_TYPE_TTGO_TDISPLAYS3PROCAMERA block: CONFIG_DISPLAY_TOUCHSCREEN_I2C depends on DISPLAY_TOUCHSCREEN, which the T-Display S3 Pro Camera config doesn't enable, so the symbol isn't generated for that board and using it there unguarded won't compile.

[jgriffiths]

Merged with rebase/formatting changes, closing thanks!