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From: Robert Nelson <robertcnelson@gmail.com>
To: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Drew Fustini <drew@pdp7.com>,
	Haojian Zhuang <haojian.zhuang@linaro.org>,
	Drew Fustini <pdp7pdp7@gmail.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Santosh Shilimkar <ssantosh@kernel.org>,
	Kevin Hilman <khilman@kernel.org>,
	"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
	Drew Fustini <drew@beagleboard.org>,
	Jason Kridner <jkridner@beagleboard.org>,
	Tony Lindgren <tony@atomide.com>,
	linux-omap <linux-omap@vger.kernel.org>
Subject: Re: gpio-omap: add support gpiolib bias (pull-up/down) flags?
Date: Wed, 15 Apr 2020 08:59:09 -0500	[thread overview]
Message-ID: <CAOCHtYgNH-OUWdKgKLr7U8Zy2OZb=P9Rpsv4mFii+VwU7h-vGA@mail.gmail.com> (raw)
In-Reply-To: <db5e49dc-41b4-2ba5-87b3-f345749d7984@ti.com>

On Wed, Apr 15, 2020 at 8:47 AM Grygorii Strashko
<grygorii.strashko@ti.com> 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@ti.com> 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/

  reply	other threads:[~2020-04-15 13:59 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-08 13:08 gpio-omap: add support gpiolib bias (pull-up/down) flags? Drew Fustini
2020-03-12 10:43 ` Linus Walleij
2020-03-13  0:39   ` Drew Fustini
2020-03-13  5:23     ` Haojian Zhuang
2020-04-13 12:39       ` Drew Fustini
2020-04-15 13:15         ` Grygorii Strashko
2020-04-15 13:20           ` Robert Nelson
2020-04-15 13:47             ` Grygorii Strashko
2020-04-15 13:59               ` Robert Nelson [this message]
2020-04-15 23:37                 ` Drew Fustini
2020-04-16 12:03                   ` Linus Walleij
2020-04-16 16:07                     ` Drew Fustini
2020-04-16 14:16                   ` Grygorii Strashko
2020-04-17 10:37                     ` Linus Walleij
2020-04-16 16:32                   ` Tony Lindgren
2020-04-23 13:17                     ` Drew Fustini
2020-04-23 16:42                       ` Tony Lindgren
2020-04-24 17:32                         ` Drew Fustini
2020-04-24 17:49                           ` Tony Lindgren
2020-05-25 13:17                             ` Drew Fustini

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