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

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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...

> @@ -351,6 +387,10 @@ static int tegra_gpio_suspend(struct device *dev)
>   			bank->oe[p] = tegra_gpio_readl(GPIO_OE(gpio));
>   			bank->int_enb[p] = tegra_gpio_readl(GPIO_INT_ENB(gpio));
>   			bank->int_lvl[p] = tegra_gpio_readl(GPIO_INT_LVL(gpio));
> +			bank->dbc_enb[p] = tegra_gpio_readl(
> +							GPIO_MSK_DBC_EN(gpio));
> +			bank->dbc_enb[p] = (bank->dbc_enb[p] << 8) ||
> +						bank->dbc_enb[p];

... since that would avoid having to or in the mask value in the saved 
register value here; you could just save/restore the regular register in 
the same way as any other register.

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[PATCH V2 1/3] gpio: tegra: Don't open code of_device_get_match_data() Laxman Dewangan <ldewangan@nvidia.com> - 2016-04-19 12:00 +0200
  [PATCH V2 2/3] gpio: tegra: Remove the need of keeping device handle for gpio driver Laxman Dewangan <ldewangan@nvidia.com> - 2016-04-19 12:00 +0200
    Re: [PATCH V2 2/3] gpio: tegra: Remove the need of keeping device  handle for gpio driver Thierry Reding <thierry.reding@gmail.com> - 2016-04-19 14:40 +0200
      Re: [PATCH V2 2/3] gpio: tegra: Remove the need of keeping device  handle for gpio driver Laxman Dewangan <ldewangan@nvidia.com> - 2016-04-19 15:00 +0200
        Re: [PATCH V2 2/3] gpio: tegra: Remove the need of keeping device  handle for gpio driver Stephen Warren <swarren@wwwdotorg.org> - 2016-04-19 18:10 +0200
  [PATCH V2 3/3] gpio: tegra: Add support for gpio debounce Laxman Dewangan <ldewangan@nvidia.com> - 2016-04-19 12:00 +0200
    Re: [PATCH V2 3/3] gpio: tegra: Add support for gpio debounce Jon Hunter <jonathanh@nvidia.com> - 2016-04-19 12:50 +0200
      Re: [PATCH V2 3/3] gpio: tegra: Add support for gpio debounce Thierry Reding <thierry.reding@gmail.com> - 2016-04-19 14:40 +0200
    Re: [PATCH V2 3/3] gpio: tegra: Add support for gpio debounce Thierry Reding <thierry.reding@gmail.com> - 2016-04-19 14:40 +0200
      Re: [PATCH V2 3/3] gpio: tegra: Add support for gpio debounce Laxman Dewangan <ldewangan@nvidia.com> - 2016-04-19 15:00 +0200
    Re: [PATCH V2 3/3] gpio: tegra: Add support for gpio debounce Stephen Warren <swarren@wwwdotorg.org> - 2016-04-19 18:20 +0200
      Re: [PATCH V2 3/3] gpio: tegra: Add support for gpio debounce Laxman Dewangan <ldewangan@nvidia.com> - 2016-04-19 18:40 +0200
        Re: [PATCH V2 3/3] gpio: tegra: Add support for gpio debounce Stephen Warren <swarren@wwwdotorg.org> - 2016-04-19 18:40 +0200
  Re: [PATCH V2 1/3] gpio: tegra: Don't open code  of_device_get_match_data() Thierry Reding <thierry.reding@gmail.com> - 2016-04-19 14:10 +0200

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