Hello Andy,

Andy Shevchenko [off-list ref] hat am 18.03.2021 13:40 geschrieben:
You may look into the commit
7cba1a4d5e16 ("gpiolib: generalize devprop_gpiochip_set_names() for
device properties")
which unifies the logic, but at the same time removed one comment:

-       /* If the chip defines names itself, these take precedence */

Well, that could be added again. And if that precedence stays as is, it should be documented in the gpio devicetree bindings to not cause further confusion?

So, logic was that for a long time. And unfortunately I don't see how
we may change this without breakage. This backs us to the discussion
if the name of the line is ABI or not.

I want to point out one point for consideration. There's usually a difference between the SoC and the boards using that SoC. So those pins are all the same from the chips point of view and the default names are set in a driver related to the chip (family).  However the line names set in device tree are probably related to a board.  Obviously different boards may have different line names, even when using the same SoC.

In other words: if I design a new board, there's no interface I would break, at least not from the userspace point of view just looking at the line names, or is there?

Thanks for looking into this.

Greets
Alex