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

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Message-Id: <20201105231912.69527-3-coiby.xu@gmail.com>
Date:   Fri,  6 Nov 2020 07:19:10 +0800
From:   Coiby Xu <coiby.xu@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-gpio@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 2/4] pinctrl: amd: use higher precision for 512 RtcClk

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>
---
 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