Re: [RFC v2 GPIO lines [was: GPIO User I/O]

[Andy Shevchenko <andy.shevchenko@xxxxxxxxx>]

On Mon, Apr 26, 2021 at 11:44 AM Rodolfo Giometti <giometti@xxxxxxxxxxxx> wrote:
>
> On 20/07/20 10:17, Linus Walleij wrote:
> > IIUC Rodolfo's idea is to provide this with a DT compatible.
> > The use case will be industrial automation-ish tasks from userspace.
> >
> > Currently the only mechanism we have in the device tree to
> > assign a use for a line is the "gpio-line-names" property,
> > which creates a name that is reported upward to the character
> > device.
> >
> > Rodolfo's patch is for scripting use cases, assigning some lines
> > for some cases to be handled by scripts, not the character device.
> >
> > What I am a bit worried about is if this would be a Linuxism, as DT
> > should be OS neutral.

Not only neutral but be software'isms free!
It's only about hardware.

What I understand here is that we have missed the intermediate layer
(let's call it 'platform abstraction') where it's related to the
platform and neither strictly speaking hardware, nor software per se.

> I'm currently using my solution for GPIOs management as input or output lines
> described in the DT on several systems.
>
> Are you re-thinking about this topic? Can we go further for inclusion or should
> I continue doing out-of-tree? :(


-- 
With Best Regards,
Andy Shevchenko