Re: gpio-omap: add support gpiolib bias (pull-up/down) flags?

[Robert Nelson <robertcnelson@xxxxxxxxx>]

On Wed, Apr 15, 2020 at 8:47 AM Grygorii Strashko
<grygorii.strashko@xxxxxx> wrote:
>
>
>
> On 15/04/2020 16:20, Robert Nelson wrote:
> > Hi Grygorii,
> >
> > On Wed, Apr 15, 2020 at 8:15 AM Grygorii Strashko
> > <grygorii.strashko@xxxxxx> wrote:
> >>
> >> For this platforms the dynamic GPIO muxing/configuration is not supported, and GPIO block by itself
> >> does not provide such functions as pullup/pulldown.
> >
> > Correct, that's the state today, while Drew is investing time into
> > trying to figure out how to properly extend this feature into our
> > platform.
>
> Sry, but it's not clear what's the final target (at least from public part of this thread).

We are mainly targeting am335x based devices.  Today (well last few
years) we've utilized a "hack-ish" kernel module (bone-pinmux-helper)
to allow users to overide/change the pinmux-ing directly from
user-space...  (This evil module allows us to specify a list of
options for each pin, thus users can easily configure specifies of the
pin, aka gpio_pd/gpio_pu/etc from user-space...).  Since that time,
mainline has now grown a generic gpio pull-up/pull-down functionality,
with the ability to re-control these values directly from a generic
gpio library (libgpiod).

Regards,

-- 
Robert Nelson
https://rcn-ee.com/