Re: [PATCH] gpio: Do not trigger WARN() with sysfs gpio export/unexport

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Fri, Nov 6, 2020 at 12:27 PM Damien Le Moal <Damien.LeMoal@xxxxxxx> wrote:

> It may not be the best interface for regular end users to
> manipulate gpios, but it is definitely super useful for developers to do quick
> tests of their setup/drivers (which is what I did for my work with the Kendryte
> K210 RISC-V SoC support).

It is a bit discouraging that RISC-V, which was invented after we already
obsoleted the sysfs ABI, is deploying this for development and test.

We need to think about a similar facility for users which is less
damaging but fulfils the same needs. I think I saw something a while
back that looked promising and added some funky files in debugfs
in a hierarchical manner per-gpiochip instead. That is how debugfs
should be used.

Yours,
Linus Walleij