* GPIO controller driver pull up/down without pinctrl
@ 2019-10-11 6:26 Jay Aurabind
2019-10-11 7:02 ` Linus Walleij
0 siblings, 1 reply; 3+ messages in thread
From: Jay Aurabind @ 2019-10-11 6:26 UTC (permalink / raw)
To: Linus Walleij, Thomas Petazzoni; +Cc: linux-gpio, Bartosz Golaszewski
Hi,
Quoting "Documentation/devicetree/bindings/gpio/gpio.txt":
Optional standard bitfield specifiers for the last cell:
[snip]
This setting only applies to hardware with a simple on/off
control for pull-up configuration. If the hardware has more
elaborate pull-up configuration, it should be represented
using a pin control binding.
So if I do not want a separate pinctrl driver, how can I do the
necessary pull up/down setup in the gpio controller driver? I could
not find any drivers using the simple interface. Is this facility
available?
--
Thanks and Regards,
Jay
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: GPIO controller driver pull up/down without pinctrl
2019-10-11 6:26 GPIO controller driver pull up/down without pinctrl Jay Aurabind
@ 2019-10-11 7:02 ` Linus Walleij
2019-10-11 7:24 ` Jay Aurabind
0 siblings, 1 reply; 3+ messages in thread
From: Linus Walleij @ 2019-10-11 7:02 UTC (permalink / raw)
To: Jay Aurabind
Cc: Thomas Petazzoni, open list:GPIO SUBSYSTEM, Bartosz Golaszewski
On Fri, Oct 11, 2019 at 8:26 AM Jay Aurabind <jay.aurabind@gmail.com> wrote:
> Quoting "Documentation/devicetree/bindings/gpio/gpio.txt":
>
> Optional standard bitfield specifiers for the last cell:
>
> [snip]
>
> This setting only applies to hardware with a simple on/off
> control for pull-up configuration. If the hardware has more
> elaborate pull-up configuration, it should be represented
> using a pin control binding.
>
> So if I do not want a separate pinctrl driver, how can I do the
> necessary pull up/down setup in the gpio controller driver? I could
> not find any drivers using the simple interface. Is this facility
> available?
See:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpio/gpio-pca953x.c
Callbacks pca953x_gpio_set_config() and what it calls further from there.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: GPIO controller driver pull up/down without pinctrl
2019-10-11 7:02 ` Linus Walleij
@ 2019-10-11 7:24 ` Jay Aurabind
0 siblings, 0 replies; 3+ messages in thread
From: Jay Aurabind @ 2019-10-11 7:24 UTC (permalink / raw)
To: Linus Walleij
Cc: Thomas Petazzoni, open list:GPIO SUBSYSTEM, Bartosz Golaszewski
On Fri, 11 Oct 2019 at 12:39, Linus Walleij <linus.walleij@linaro.org> wrote:
>
> On Fri, Oct 11, 2019 at 8:26 AM Jay Aurabind <jay.aurabind@gmail.com> wrote:
>
> > Quoting "Documentation/devicetree/bindings/gpio/gpio.txt":
> >
> > Optional standard bitfield specifiers for the last cell:
> >
> > [snip]
> >
> > This setting only applies to hardware with a simple on/off
> > control for pull-up configuration. If the hardware has more
> > elaborate pull-up configuration, it should be represented
> > using a pin control binding.
> >
> > So if I do not want a separate pinctrl driver, how can I do the
> > necessary pull up/down setup in the gpio controller driver? I could
> > not find any drivers using the simple interface. Is this facility
> > available?
>
> See:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpio/gpio-pca953x.c
> Callbacks pca953x_gpio_set_config() and what it calls further from there.
>
Thank you very much for the quick response!
--
Thanks and Regards,
Jay
^ permalink raw reply [flat|nested] 3+ messages in thread
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