linux-kernel - Re: [PATCH v3 24/25] drivers: media: i2c: imx258: Add support for reset gpio

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Message-ID: <1080d78d-73f4-41d3-ab72-f2cc1001e184@luigi311.com>
Date: Wed, 3 Apr 2024 13:48:43 -0600
From: Luigi311 <git@...gi311.com>
To: Ondřej Jirman <megous@...ous.com>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 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, 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
Subject: Re: [PATCH v3 24/25] drivers: media: i2c: imx258: Add support for
 reset gpio

On 4/3/24 11:03, Ondřej Jirman wrote:
> Hi,
> 
> On Wed, Apr 03, 2024 at 04:28:59PM GMT, Sakari Ailus wrote:
>> Hi Luis,
>>
>> Could you unify the subject prefix for the driver patches, please? E.g.
>> "media: imx258: " would be fine.
>>
>> On Wed, Apr 03, 2024 at 09:03:53AM -0600, git@...gi311.com wrote:
>>> From: Luis Garcia <git@...gi311.com>
>>>
>>> It was documented in DT, but not implemented.
>>>
>>> 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 163f04f6f954..4c117c4829f1 100644
>>> --- a/drivers/media/i2c/imx258.c
>>> +++ b/drivers/media/i2c/imx258.c
>>> @@ -680,6 +680,7 @@ struct imx258 {
>>>  	unsigned int csi2_flags;
>>>  
>>>  	struct gpio_desc *powerdown_gpio;
>>> +	struct gpio_desc *reset_gpio;
>>>  
>>>  	/*
>>>  	 * Mutex for serialized access:
>>> @@ -1232,7 +1233,11 @@ 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);
>>> +
>>> +	usleep_range(400, 500);
>>
>> You could mention this at least in the commit message.
> 
> This is T6 in the datasheet: https://megous.com/dl/tmp/92c9223ce877216e.png
> 
> 
>>> +
>>> +	return 0;
>>>  }
>>>  
>>>  static int imx258_power_off(struct device *dev)
>>> @@ -1243,6 +1248,7 @@ static int imx258_power_off(struct device *dev)
>>>  	clk_disable_unprepare(imx258->clk);
>>>  	regulator_bulk_disable(IMX258_NUM_SUPPLIES, imx258->supplies);
>>>  
>>> +	gpiod_set_value_cansleep(imx258->reset_gpio, 1);
>>
>> Same question than on the other GPIO: does this belong here?
> 
> No, this should be before the regulator_bulk_disable.
> 
> See: https://megous.com/dl/tmp/c96180b23d7ce63a.png
> 
> kind regards,
> 	o.
> 

Since I'm supposed to move the reset up should I also
move the power up with it to match your downstream
driver?

>>>  	gpiod_set_value_cansleep(imx258->powerdown_gpio, 1);
>>>  
>>>  	return 0;
>>> @@ -1554,6 +1560,12 @@ 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);
>>>  
>>
>> -- 
>> Regards,
>>
>> Sakari Ailus