Re: [RFC PATCH v2] pinctrl: add helper to expose pinctrl state in debugfs

[Tony Lindgren]

Hi,

* Linus Walleij <linus.walleij@xxxxxxxxxx> [210109 21:14]:
> On Sat, Jan 9, 2021 at 3:55 AM Drew Fustini <drew@xxxxxxxxxxxxxxx> wrote:
> 
> > I discussed my use case and this patch on #armlinux earlier this week
> > and Alexandre Belloni suggested looking at the pinmux-pins debugfs file.
> 
> This sounds reasonable.
> 
> > This made me think that a possible solution could be to define a store
> > function for pinmux-pins to handle something like "<pin#> <function#>".
> > I believe the ability to activate a pin function (or pin group) from
> > userspace would satisfy our beagleboard.org use-case.
> >
> > Does that seem like a reasonable approach?
> 
> This sounds like a good approach.

Makes sense to me too.

We may want to make it into a proper sysfs interface eventually to not
require debugfs be enabled in .config. But that's another set of patches,
certainly makes sense to first enable it for debugfs.

Regards,

Tony