On 11/16/2020 3:37 PM, Mark Tomlinson wrote:
> When setting a GPIO pin to an output, it is important to set the value
> correctly before enabling the output so that a glitch is not seen on the
> pin. This glitch may be very short, but can be important if this is a
> reset signal.
>
> Fixes: 8bfcbbbcabe0 ("pinctrl: nsp: add gpio-a driver support for Broadcom
> NSP SoC")
> Signed-off-by: Mark Tomlinson <[email protected]>
> ---
> drivers/pinctrl/bcm/pinctrl-nsp-gpio.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pinctrl/bcm/pinctrl-nsp-gpio.c
> b/drivers/pinctrl/bcm/pinctrl-nsp-gpio.c
> index a00a42a61a90..942f04ca4868 100644
> --- a/drivers/pinctrl/bcm/pinctrl-nsp-gpio.c
> +++ b/drivers/pinctrl/bcm/pinctrl-nsp-gpio.c
> @@ -289,8 +289,8 @@ static int nsp_gpio_direction_output(struct gpio_chip
> *gc, unsigned gpio,
> unsigned long flags;
>
> raw_spin_lock_irqsave(&chip->lock, flags);
> - nsp_set_bit(chip, REG, NSP_GPIO_OUT_EN, gpio, true);
> nsp_set_bit(chip, REG, NSP_GPIO_DATA_OUT, gpio, !!(val));
> + nsp_set_bit(chip, REG, NSP_GPIO_OUT_EN, gpio, true);
> raw_spin_unlock_irqrestore(&chip->lock, flags);
>
> dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val);
> The fix looks good to me. Thanks! Acked-by: Ray Jui <[email protected]>
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