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.

Cc: stable@vger.kernel.org
Reported-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Suggested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Coiby Xu <coiby.xu@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/linux-gpio/2f4706a1-502f-75f0-9596-cc25b4933b6c@redhat.com/
Link: https://lore.kernel.org/r/20201105231912.69527-3-coiby.xu@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
index d6b2b4bd337c3574877e73e352a7ee43249b1d5f..4aea3e05e8c65745e5275df4a3f0348865da6405 100644 (file)
--- 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);