linux-kernel - Re: [PATCH v3 2/4] pinctrl: amd: use higher precision for 512 RtcClk

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Date:   Mon, 9 Nov 2020 14:50:23 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Coiby Xu <coiby.xu@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-gpio@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/4] pinctrl: amd: use higher precision for 512 RtcClk

Hi,

On 11/6/20 12:19 AM, Coiby Xu wrote:
> RTC is 32.768kHz thus 512 RtcClk equals 15625 usec. The documentation
> likely has dropped precision and that's why the driver mistakenly took
> the slightly deviated value.
> 
> Reported-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Suggested-by: Hans de Goede <hdegoede@...hat.com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Link: https://lore.kernel.org/linux-gpio/2f4706a1-502f-75f0-9596-cc25b4933b6c@redhat.com/
> Signed-off-by: Coiby Xu <coiby.xu@...il.com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans


> ---
>  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);
>