Hi Geert, Maerek,

On Fri, Jun 11, 2021 at 08:23:10PM +0200, Geert Uytterhoeven wrote:

Hi Marek,

On Fri, Jun 11, 2021 at 4:20 PM Marek Vasut [off-list ref] wrote:

quoted

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

quoted

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.

I'm not so sure they're for the same hardware, but you may know better?
https://www.displayvisions.us/fileadmin/html-seiten/eng/pdf/zubehoer/ILITek_TP_Programming_Guide_V1.50.pdf
lists only Ilitek parts handled by ilitek_ts_i2c.c.

Ilitek folks said that the new driver is for their "Lego" series
controllers, whereas ili210x.c is for older hardware.

Thanks.

-- 
Dmitry