[PATCH 02/16] media: v4l2-device: Add struct v4l2_device.flags

[Gjorgji Rosikopulos (Consultant)]

Hi Daniel,

On 11/3/2026 9:40 AM, Daniel Scally wrote:
> Add a flags field to struct v4l2_device, along with a single flag
> value that is designed to tell v4l2-async in which direction data
> flows for this v4l2 device so that it knows how to set up device
> links between subdevices connected using the async APIs.
> 
> Signed-off-by: Daniel Scally <dan.scally at ideasonboard.com>
> ---
>  include/media/v4l2-device.h | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h
> index 25f69b1b8db03d077f7570471d5c6910fcafe110..9b17916d63641ba637cf8c37aa925749bd4e2134 100644
> --- a/include/media/v4l2-device.h
> +++ b/include/media/v4l2-device.h
> @@ -15,6 +15,9 @@
>  
>  struct v4l2_ctrl_handler;
>  
> +/* Set this flag if this V4L2 device is an "output" rather than an "input". */
> +#define V4L2_DEVICE_FL_IS_OUTPUT			BIT(0)

Just for the clarification do we change the meaning of output->capture to input->output?
I know that output is confusing for everyone including me but somehow i get used to it.
However to clarify what this means will be helpful :-)

~Gjorgji

> +
>  /**
>   * struct v4l2_device - main struct to for V4L2 device drivers
>   *
> @@ -30,6 +33,9 @@ struct v4l2_ctrl_handler;
>   * @ref: Keep track of the references to this struct.
>   * @release: Release function that is called when the ref count
>   *	goes to 0.
> + * @flags: device flags. Can be:
> + *   %V4L2_DEVICE_FL_IS_OUTPUT - Set this flag if this V4L2 device is an
> + *   "output" rather than an "input"
>   *
>   * Each instance of a V4L2 device should create the v4l2_device struct,
>   * either stand-alone or embedded in a larger struct.
> @@ -54,6 +60,7 @@ struct v4l2_device {
>  	struct v4l2_prio_state prio;
>  	struct kref ref;
>  	void (*release)(struct v4l2_device *v4l2_dev);
> +	u32 flags;
>  };
>  
>  /**
>