linux-kernel - Re: [PATCH] pinctrl: bcm: pinctrl-nsp-gpio: Fix setting GPIO as output

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Message-ID: <87cfa20f-697f-3123-23bd-22e2771bf663@broadcom.com>
Date:   Mon, 16 Nov 2020 15:55:49 -0800
From:   Ray Jui <ray.jui@...adcom.com>
To:     Mark Tomlinson <mark.tomlinson@...iedtelesis.co.nz>,
        rjui@...adcom.com, sbranden@...adcom.com
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: bcm: pinctrl-nsp-gpio: Fix setting GPIO as
 output



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 <mark.tomlinson@...iedtelesis.co.nz>
> ---
>  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 <ray.jui@...adcom.com>

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