Re: [PATCH v2] gpiolib: Disallow identical line names in the same chip

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Wed, Jan 6, 2021 at 11:09 AM Bartosz Golaszewski
<bgolaszewski@xxxxxxxxxxxx> wrote:

> I can do it alright. But in the context of user-space I think this
> doesn't really change anything. DT users still can use non-unique
> names and libgpiod still has to account for that if the API is to be
> considered correct. Is this change really useful? How does it affect
> ACPI users that already define non-unique names?

For hardware description instances the problem remains: device tree
line-names and device properties can be non-unique.

What it solves is to enforce unique line names for gpio chips with
the struct gpio_chip .names array set to some names, that each
name in this array must be unique.

This happens for example when two USB FTDI converters
with the same GPIO lines are plugged in. Each chip can have a
"TX" line but it can no longer have two "TX" lines.

Yours,
Linus Walleij