linux-kernel - Re: [PATCH v2 2/4] pinctrl: amd: use higher precision for 512 RtcClk

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Date:   Thu, 5 Nov 2020 13:13:07 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Coiby Xu <coiby.xu@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        "open list:PIN CONTROL SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] pinctrl: amd: use higher precision for 512 RtcClk

On Thu, Nov 5, 2020 at 1:07 AM Coiby Xu <coiby.xu@...il.com> wrote:
>
> RTC is 32.768kHz thus 512 RtcClk equals 15625 usec.

I could add that the documentation likely has dropped precision and
that's why the driver mistakenly took the slightly deviated value.

Anyway.
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Suggested-by: Hans de Goede <hdegoede@...hat.com>
> Link: https://lore.kernel.org/linux-gpio/2f4706a1-502f-75f0-9596-cc25b4933b6c@redhat.com/
> Signed-off-by: Coiby Xu <coiby.xu@...il.com>
> ---
>  drivers/pinctrl/pinctrl-amd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
> index d6b2b4bd337c..4aea3e05e8c6 100644
> --- a/drivers/pinctrl/pinctrl-amd.c
> +++ b/drivers/pinctrl/pinctrl-amd.c
> @@ -156,7 +156,7 @@ static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset,
>                         pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
>                         pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
>                 } else if (debounce < 250000) {
> -                       time = debounce / 15600;
> +                       time = debounce / 15625;
>                         pin_reg |= time & DB_TMR_OUT_MASK;
>                         pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
>                         pin_reg |= BIT(DB_TMR_LARGE_OFF);
> --
> 2.28.0
>


-- 
With Best Regards,
Andy Shevchenko