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

[Laxman Dewangan <ldewangan@nvidia.com>]

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.