Re: GPIO controller driver pull up/down without pinctrl

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Fri, Oct 11, 2019 at 8:26 AM Jay Aurabind <jay.aurabind@xxxxxxxxx> 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