On 6/11/21 3:54 PM, Geert Uytterhoeven wrote:

While Linux uses a different driver, the Ilitek
ILI210x/ILI2117/ILI2120/ILI251x touchscreen controller Device Tree
binding documentation is very similar.

   - Drop the fixed reg value, as some controllers use a different
     address,
   - Make reset-gpios optional, as it is not always wired.

It looks like there are now two drivers for the same hardware,
drivers/input/touchscreen/ili210x.c
drivers/input/touchscreen/ilitek_ts_i2c.c
The ilitek_ts_i2c (newer) seems to be derived from the ilitek example 
code / driver, while the ili210x was written from scratch as far as I 
can tell.