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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <e4d0d1a2-117e-4106-9674-f78165060e8e@luigi311.com>
Date: Mon, 15 Apr 2024 10:25:53 -0600
From: Luis Garcia <git@...gi311.com>
To: Tommaso Merciai <tomm.merciai@...il.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

On 4/15/24 10:00, Tommaso Merciai wrote:
> 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.
> 

Done

>> +	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>
>

Thanks!
 
>> -- 
>> 2.44.0
>>
>>