Re: [PATCH v2] ARM: dts: am335x-pocketbeagle: set default mux for gpio pins

Tony Lindgren
2020-06-30T21:34:31Z

* Drew Fustini <drew@beagleboard.org> [200630 21:32]:
> On Tue, Jun 30, 2020 at 11:20:37AM -0700, Tony Lindgren wrote:
...
> > > > Needing to change the dts does not sound good to me.. But maybe you mean
> > > > this is needed until the gpio-omap and pinctrl-single patches are merged?
> > >
> > > I agree that I would like for userspace to be able to do run-time
> > > changes. However, I think something would need to be added to the
> > > pinconf support in pinctrl-single for that to be possible. There are
> > > bias properties but non for receiver enable.
> > >
> > > Does it seem sensible to add that?
> >
> > Well let's see with Linus W says. To me it seems this might be a good
> > reason to allow a sysfs interface to change the pinctrl if we don't
> > have it yet? With the proper gpio line naming it should be quite simple
> > to use too :)
>
> I think if pinctrl-single allowed mux to be set through debugfs that
> could be one solution to the use case of users prototyping with a
> beaglebone. Maybe that could be acceptable?

I think this should not depend on debugfs though, it should be a
generic interface.

Regards,

Tony