linux-kernel - Re: [PATCH v4 23/25] media: i2c: imx258: Add support for reset gpio

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Message-ID: <Zh1PGuTjFlttNnLX@tom-HP-ZBook-Fury-15-G7-Mobile-Workstation>
Date: Mon, 15 Apr 2024 18:00:26 +0200
From: Tommaso Merciai <tomm.merciai@...il.com>
To: git@...gi311.com
Cc: linux-media@...r.kernel.org, dave.stevenson@...pberrypi.com,
	jacopo.mondi@...asonboard.com, mchehab@...nel.org, robh@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
	festevam@...il.com, sakari.ailus@...ux.intel.com,
	devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	pavel@....cz, phone-devel@...r.kernel.org,
	Ondrej Jirman <megous@...ous.com>
Subject: Re: [PATCH v4 23/25] media: i2c: imx258: Add support for reset gpio

Hi Luis,

On Sun, Apr 14, 2024 at 02:35:01PM -0600, git@...gi311.com wrote:
> From: Luis Garcia <git@...gi311.com>
> 
> It was documented in DT, but not implemented.

Good catch :-)

> 
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> Signed-off-by: Luis Garcia <git@...gi311.com>
> ---
>  drivers/media/i2c/imx258.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
> index f0bd72f241e4..5de71cb7c1ae 100644
> --- a/drivers/media/i2c/imx258.c
> +++ b/drivers/media/i2c/imx258.c
> @@ -699,6 +699,7 @@ struct imx258 {
>  	unsigned int csi2_flags;
>  
>  	struct gpio_desc *powerdown_gpio;
> +	struct gpio_desc *reset_gpio;
>  
>  	/*
>  	 * Mutex for serialized access:
> @@ -1250,7 +1251,11 @@ static int imx258_power_on(struct device *dev)
>  		regulator_bulk_disable(IMX258_NUM_SUPPLIES, imx258->supplies);
>  	}
>  
> -	return ret;
> +	gpiod_set_value_cansleep(imx258->reset_gpio, 0);
> +

I think you can remove this new line here.

> +	usleep_range(400, 500);
> +
> +	return 0;
>  }
>  
>  static int imx258_power_off(struct device *dev)
> @@ -1260,6 +1265,7 @@ static int imx258_power_off(struct device *dev)
>  
>  	clk_disable_unprepare(imx258->clk);
>  
> +	gpiod_set_value_cansleep(imx258->reset_gpio, 1);
>  	gpiod_set_value_cansleep(imx258->powerdown_gpio, 1);
>  
>  	regulator_bulk_disable(IMX258_NUM_SUPPLIES, imx258->supplies);
> @@ -1573,6 +1579,12 @@ static int imx258_probe(struct i2c_client *client)
>  	if (IS_ERR(imx258->powerdown_gpio))
>  		return PTR_ERR(imx258->powerdown_gpio);
>  
> +	/* request optional reset pin */
> +	imx258->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
> +						     GPIOD_OUT_HIGH);
> +	if (IS_ERR(imx258->reset_gpio))
> +		return PTR_ERR(imx258->reset_gpio);
> +
>  	/* Initialize subdev */
>  	v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops);
>  

Looks good to me.
Reviewed-by: Tommaso Merciai <tomm.merciai@...il.com>

> -- 
> 2.44.0
> 
>