Mobile phone based on Taishanpai development board

This project uses a 3.1-inch 480*800 MIPI 24-pin TFT touchscreen from Daxian Weiye. This screen uses the MIPI_DSI interface, and the screen cable has 24 pins.
The interface definitions are as follows:
It's important to note that pin 24 (GND) corresponds to pin 1 of the 24-pin FPC4 connector on the adapter board.
Pin 6 (VDD-28) of the touchscreen TP interface corresponds to pin 6 (VCC_3V3) of the 3.1-inch touchscreen interface FPC connector on the adapter board.
The Taishanpai MIPI interface is a standard 31-pin, while the touchscreen interface is 6-pin. Although the 3.1-inch screen touch interface is also 6-pin, the pinout of each interface is different from the Taishanpai.
The onboard backlight circuit on the Taishanpai has an output current of 110mA. Our 3.1-inch screen can only withstand a maximum drive current of 25mA, so it's not suitable to directly connect to the 3.1-inch screen's FPC.
Therefore, we designed a separate backlight circuit on the adapter board.
The backlight circuit mainly consists of a backlight selection circuit, a backlight driving circuit, and a backlight adjustment circuit.
My profession is a structural engineer. I've loved assembling and disassembling electronic products since childhood, and watching the hardware and software engineers in my project team fiddling with circuit boards and burning firmware always made me itch to try it myself.
JLCPCB's quick-draw board has always been the company's first choice. Last year, I accidentally came across JLCPCB's EDA software and downloaded it to learn, but I never had the opportunity to practice it.
Although I had studied embedded Linux systems before, I found them very difficult. By chance, I joined the Taishan School (a training program), finally stepping into the world of electronics and fulfilling a childhood dream. Unexpectedly,
although it was my first time using EDA software to design a board, I didn't make any mistakes, except for one Schottky diode being placed backwards.