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

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Message-ID: <2d0ed323-d2c4-b60c-7f10-a313458e4656@broadcom.com>
Date:   Mon, 16 Nov 2020 14:23:24 -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-iproc-gpio: Fix setting GPIO as
 output



On 11/16/2020 1:58 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: b64333ce769c ("pinctrl: cygnus: add gpio/pinconf driver")
> Signed-off-by: Mark Tomlinson <mark.tomlinson@...iedtelesis.co.nz>
> ---
>  drivers/pinctrl/bcm/pinctrl-iproc-gpio.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c b/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c
> index e2bd2dce6bb4..cadcf5eb0466 100644
> --- a/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c
> +++ b/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c
> @@ -348,8 +348,8 @@ static int iproc_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
>  	unsigned long flags;
>  
>  	raw_spin_lock_irqsave(&chip->lock, flags);
> -	iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, true);
>  	iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val));
> +	iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, true);
>  	raw_spin_unlock_irqrestore(&chip->lock, flags);
>  
>  	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val);
> 

Thanks. The fix looks good. Would you be able to also help fix this in
pinctrl-nsp-gpio.c ?

Acked-by: Ray Jui <ray.jui@...adcom.com>

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