Re: [PATCH V2 3/3] gpio: tegra: Add support for gpio debounce

[Laxman Dewangan]

On Tuesday 19 April 2016 09:41 PM, Stephen Warren wrote:
> On 04/19/2016 03:43 AM, Laxman Dewangan wrote:
> > NVIDIA's Tegra210 support the HW debounce in the GPIO
> > controller for all its GPIO pins.
> >
> > Add support for setting debounce timing by implementing the
> > set_debounce callback of gpiochip.
>
> > diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
>
> > @@ -327,6 +360,9 @@ static int tegra_gpio_resume(struct device *dev)
> >               tegra_gpio_writel(bank->oe[p], GPIO_OE(gpio));
> >               tegra_gpio_writel(bank->int_lvl[p], GPIO_INT_LVL(gpio));
> >               tegra_gpio_writel(bank->int_enb[p], GPIO_INT_ENB(gpio));
> > +            tegra_gpio_writel(bank->dbc_cnt[p], GPIO_DBC_CNT(gpio));
> > +            tegra_gpio_writel(bank->dbc_enb[p],
> > +                      GPIO_MSK_DBC_EN(gpio));
>
> Why not just write to the "regular" register rather than the mask 
> register here...

There is no regular register for enabling debounce. Only masked register 
exist.