linux-kernel - Re: [PATCH v2] media: i2c: imx258: Parse and register properties

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Date:   Wed, 4 Jan 2023 15:14:50 +0100
From:   Robert Mader <robert.mader@...labora.com>
To:     Jacopo Mondi <jacopo.mondi@...asonboard.com>
Cc:     linux-kernel@...r.kernel.org, nicholas@...hemail.net,
        javierm@...hat.com, Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org
Subject: Re: [PATCH v2] media: i2c: imx258: Parse and register properties

On 04.01.23 15:11, Jacopo Mondi wrote:
> Hi Robert
>
> On Wed, Jan 04, 2023 at 01:23:37PM +0100, Robert Mader wrote:
>> Analogous to e.g. the imx219. This enables propagating
>> V4L2_CID_CAMERA_ORIENTATION and V4L2_CID_CAMERA_SENSOR_ROTATION
>> values.
>> The motivation is to allow libcamera detect these values from the
>> device tree and propagate them further to e.g. Pipewire.
>>
>> While at it, reserve space for 3 additional controls even if
>> v4l2_ctrl_new_fwnode_properties() can only register 2 of
>> them, to fix the existing implementation which reserve space for 8
>> controls but actually registers 9.
>>
>> Changes in v2:
>>   - Reserve 11 instead of 10 controls
>>   - Change order of variable declaration
>>   - Slightly extend description
> This part should go below, after ---, as it shouldn't be part of the commit
> message
>
> The patch looks good
>
> Reviewed-by: Jacopo Mondi <jacopo.mondi@...asonboard.com>
Thanks! And ops, right, make sense. Should I spin a v3 for that or is it 
simple enough to fix when pulling?
>> Signed-off-by: Robert Mader <robert.mader@...labora.com>
>> ---
>>   drivers/media/i2c/imx258.c | 13 ++++++++++++-
>>   1 file changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
>> index eab5fc1ee2f7..3b560865b657 100644
>> --- a/drivers/media/i2c/imx258.c
>> +++ b/drivers/media/i2c/imx258.c
>> @@ -9,6 +9,7 @@
>>   #include <linux/pm_runtime.h>
>>   #include <media/v4l2-ctrls.h>
>>   #include <media/v4l2-device.h>
>> +#include <media/v4l2-fwnode.h>
>>   #include <asm/unaligned.h>
>>
>>   #define IMX258_REG_VALUE_08BIT		1
>> @@ -1148,6 +1149,7 @@ static const struct v4l2_subdev_internal_ops imx258_internal_ops = {
>>   static int imx258_init_controls(struct imx258 *imx258)
>>   {
>>   	struct i2c_client *client = v4l2_get_subdevdata(&imx258->sd);
>> +	struct v4l2_fwnode_device_properties props;
>>   	struct v4l2_ctrl_handler *ctrl_hdlr;
>>   	s64 vblank_def;
>>   	s64 vblank_min;
>> @@ -1156,7 +1158,7 @@ static int imx258_init_controls(struct imx258 *imx258)
>>   	int ret;
>>
>>   	ctrl_hdlr = &imx258->ctrl_handler;
>> -	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 8);
>> +	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 11);
>>   	if (ret)
>>   		return ret;
>>
>> @@ -1232,6 +1234,15 @@ static int imx258_init_controls(struct imx258 *imx258)
>>   		goto error;
>>   	}
>>
>> +	ret = v4l2_fwnode_device_parse(&client->dev, &props);
>> +	if (ret)
>> +		goto error;
>> +
>> +	ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, &imx258_ctrl_ops,
>> +					      &props);
>> +	if (ret)
>> +		goto error;
>> +
>>   	imx258->sd.ctrl_handler = ctrl_hdlr;
>>
>>   	return 0;
>> --
>> 2.39.0
>>