Re: [PATCH V5 0/4] gpio: tegra: Cleanups and support for debounce

[Laxman Dewangan <ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

On Saturday 30 April 2016 04:37 PM, Linus Walleij wrote:
> On Fri, Apr 29, 2016 at 11:20 AM, Laxman Dewangan <ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> wrote:
>> On Friday 29 April 2016 02:37 PM, Linus Walleij wrote:
>>> On Mon, Apr 25, 2016 at 12:38 PM, Laxman Dewangan <ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>>> wrote:
>>>
>>>> Add support for the debounce as Tegra210 support debounce in HW.
>>>> Also do the clenaups to remove all global variables.
>>> OK this v5 is applied.
>>>
>>> Laxman does this GPIO also have open drain and/or open source
>>> handling?
>>
>> Some of the pins support the open drain and these are part of pinmux
>> register set.
>> For that we have property for setting open drain.
>>
>> Is it possible to link the gpio APIs to pincontrol for setting that pin?
> I have the same issue with Nomadik pin control that I use as a
> testbed: there is a backend in pin control to the GPIO side.
>
> I was thinking about adding a new cross call. We now have this:
>
> /* External interface to pin control */
> extern int pinctrl_request_gpio(unsigned gpio);
> extern void pinctrl_free_gpio(unsigned gpio);
> extern int pinctrl_gpio_direction_input(unsigned gpio);
> extern int pinctrl_gpio_direction_output(unsigned gpio);
>
> I was going to add:
>
> extern int pinctrl_gpio_set_config(unsigned gpio, unsigned long config);
>
> That can be used by GPIO drivers to call back into pincontrol
> and set up any config flags using the conventions of the
> corresponding pin control back-end.
>
> This could be used for as well open drain as other things (like
> pull-up) as the userspace ABI matures (it currently only has
> in/out and open drain/source).
>
> What do you think about this idea?
>

Yes, this will be great.
We will have generic interface which help in extending it in option.