linux-kernel - Re: [PATCH v2] media: i2c: ov5640: Implement get_mbus

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Date:   Tue, 14 Mar 2023 14:13:46 +0200
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Marcel Ziswiler <marcel@...wiler.com>
Cc:     linux-media@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Philipp Zabel <p.zabel@...gutronix.de>, kernel@...gutronix.de,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        Jacopo Mondi <jacopo.mondi@...asonboard.com>,
        Aishwarya Kothari <aishwarya.kothari@...adex.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Steve Longerbeam <slongerbeam@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: i2c: ov5640: Implement get_mbus_config

Hi Marcel,

On Mon, Mar 06, 2023 at 07:36:49AM +0100, Marcel Ziswiler wrote:
> From: Aishwarya Kothari <aishwarya.kothari@...adex.com>
> 
> Implement the introduced get_mbus_config operation to report the
> config of the MIPI CSI-2, BT.656 and Parallel interface.
> 
> Signed-off-by: Aishwarya Kothari <aishwarya.kothari@...adex.com>
> Signed-off-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
> 
> ---
> 
> Changes in v2:
> - Take care of MIPI CSI-2, BT.656 and Parallel interface as
>   pointed out by Jacopo. Thanks!
> 
>  drivers/media/i2c/ov5640.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
> index 1536649b9e90..43373416fcba 100644
> --- a/drivers/media/i2c/ov5640.c
> +++ b/drivers/media/i2c/ov5640.c
> @@ -3774,6 +3774,24 @@ static int ov5640_init_cfg(struct v4l2_subdev *sd,
>  	return 0;
>  }
>  
> +static int ov5640_get_mbus_config(struct v4l2_subdev *sd,
> +				   unsigned int pad,
> +				   struct v4l2_mbus_config *cfg)
> +{
> +	struct ov5640_dev *sensor = to_ov5640_dev(sd);
> +
> +	cfg->type = sensor->ep.bus_type;
> +	if (ov5640_is_csi2(sensor)) {
> +		cfg->bus.mipi_csi2.num_data_lanes =
> +			sensor->ep.bus.mipi_csi2.num_data_lanes;
> +		cfg->bus.mipi_csi2.flags = sensor->ep.bus.mipi_csi2.flags;
> +	} else {
> +		cfg->bus.parallel.flags = sensor->ep.bus.parallel.flags;
> +	}
> +
> +	return 0;
> +}
> +
>  static const struct v4l2_subdev_core_ops ov5640_core_ops = {
>  	.log_status = v4l2_ctrl_subdev_log_status,
>  	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
> @@ -3794,6 +3812,7 @@ static const struct v4l2_subdev_pad_ops ov5640_pad_ops = {
>  	.get_selection = ov5640_get_selection,
>  	.enum_frame_size = ov5640_enum_frame_size,
>  	.enum_frame_interval = ov5640_enum_frame_interval,
> +	.get_mbus_config = ov5640_get_mbus_config,

What's the reasoning for this patch?

Drivers that don't have e.g. dynamic lane configuration shouldn't need to
implement get_mbus_config.

-- 
Kind regards,

Sakari Ailus