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

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Date:   Wed, 4 Jan 2023 15:11:59 +0100
From:   Jacopo Mondi <jacopo.mondi@...asonboard.com>
To:     Robert Mader <robert.mader@...labora.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

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>

>
> 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
>