RE: Compatible for two version of a ST7735R driver

Einar Thorsrud — Wed, 10 Jan 2024 09:12:02 GMT

Hi,

You can think of compatible as "use this driver", so you are effectively trying to include both drivers, which will cause conflict. So that will not work.

RE: Compatible for two version of a ST7735R driver

Trymme — Mon, 08 Jan 2024 13:28:50 GMT

Thank you for you answer Einar.

I already have different naming conventions so this should not be an issue.

I solved the issues by adjusting config includes in the prj.conf.

To add my driver i added the Kconfig CONFIG_BM_ST7735R=y (different name than the Zephyr driver CONFIG_ST7735R ).

However, to use it i also needed to add the Kconfig CONFIG_DISPLAY=y. And after looking into this Kconfig i found out that when i set this to yes, it implicitly include CONFIG_ST7735R=y by default, which result in duplicates. Therefore, to remove the include of the Zephyr driver i had to explicitly remove the driver by adding CONFIG_ST7735R=n to the prj.conf.

Therefore, for it too function correctly i had these configuration:

CONFIG_BM_ST7735R=y

CONFIG_DISPLAY=y

CONFIG_ST7735R=n

It would still be interesting to understand why i could not use 1 compatible for two drivers, with both driver included. What made the compiler believe that these where duplicates when the only link between them was that they shared the same compatible?

RE: Compatible for two version of a ST7735R driver

Einar Thorsrud — Mon, 08 Jan 2024 12:52:42 GMT

Hi,

I suggest you name your driver something else, to avoid conflict (then refer to the device by the new name you use for your driver to use it).