linux-kernel - RE: [PATCH v2] iio: adis: set GPIO reset pin direction

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Date:   Thu, 8 Jul 2021 10:05:40 +0000
From:   "Sa, Nuno" <Nuno.Sa@...log.com>
To:     Antti Keränen <detegr@....email>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
CC:     Hannu Hartikainen <hannu@...k.in>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] iio: adis: set GPIO reset pin direction



> -----Original Message-----
> From: Antti Keränen <detegr@....email>
> Sent: Thursday, July 8, 2021 11:54 AM
> To: linux-iio@...r.kernel.org
> Cc: Antti Keränen <detegr@....email>; Hannu Hartikainen
> <hannu@...k.in>; Lars-Peter Clausen <lars@...afoo.de>; Hennerich,
> Michael <Michael.Hennerich@...log.com>; Sa, Nuno
> <Nuno.Sa@...log.com>; Jonathan Cameron <jic23@...nel.org>;
> open list <linux-kernel@...r.kernel.org>
> Subject: [PATCH v2] iio: adis: set GPIO reset pin direction
> 
> Set reset pin direction to output as the reset pin needs to be an active
> low output pin.
> 
> Co-developed-by: Hannu Hartikainen <hannu@...k.in>
> Signed-off-by: Hannu Hartikainen <hannu@...k.in>
> Signed-off-by: Antti Keränen <detegr@....email>
> ---
> Removed unnecessary toggling of the pin as requested by Lars-Peter. I
> missed out on the conversation, but I agree this is better.
> 
>  drivers/iio/imu/adis.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c
> index 319b64b2fd88..f8b7837d8b8f 100644
> --- a/drivers/iio/imu/adis.c
> +++ b/drivers/iio/imu/adis.c
> @@ -415,12 +415,11 @@ int __adis_initial_startup(struct adis *adis)
>  	int ret;
> 
>  	/* check if the device has rst pin low */
> -	gpio = devm_gpiod_get_optional(&adis->spi->dev, "reset",
> GPIOD_ASIS);
> +	gpio = devm_gpiod_get_optional(&adis->spi->dev, "reset",
> GPIOD_OUT_HIGH);
>  	if (IS_ERR(gpio))
>  		return PTR_ERR(gpio);
> 
>  	if (gpio) {
> -		gpiod_set_value_cansleep(gpio, 1);
>  		msleep(10);
>  		/* bring device out of reset */
>  		gpiod_set_value_cansleep(gpio, 0);
> --

Reviewed-by: Nuno Sá <nuno.sa@...log.com> 


Thanks!

- Nuno Sá