linux-kernel - Re: [PATCH v2 12/27] media: v4l2-subdev: Introduce v4l2 subdev context

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Message-ID: <pdxsi4fskze6mvgro5foa3jvmrvl3ihmksnzukonoihkb5xum5@kph26jtiayda>
Date: Tue, 30 Sep 2025 11:53:39 +0200
From: Jacopo Mondi <jacopo.mondi@...asonboard.com>
To: Anthony McGivern <Anthony.McGivern@....com>
Cc: "jacopo.mondi@...asonboard.com" <jacopo.mondi@...asonboard.com>, 
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Subject: Re: [PATCH v2 12/27] media: v4l2-subdev: Introduce v4l2 subdev
 context

Hi Anthony

On Thu, Sep 25, 2025 at 09:26:56AM +0000, Anthony McGivern wrote:
>
> Hi Jacopo,
>
> On Thu, Jul 24, 2025 at 16:10:19 +0200, Jacopo Mondi write:
> > Introduce a new type in v4l2 subdev that represents a v4l2 subdevice
> > contex. It extends 'struct media_entity_context' and is intended to be
> > extended by drivers that can store driver-specific information
> > in their derived types.
> >
> > Signed-off-by: Jacopo Mondi <jacopo.mondi@...asonboard.com>
>
> I am interested in how the sub-device context will handle the Streams API? Looking at the commits the v4l2_subdev_enable/disable_streams functions still appear to operate on the main sub-device only. I take it we would have additional context-aware functions here that can fetch the subdev state from the sub-device context, though I imagine some fields will have to be moved into the context such as s_stream_enabled, or even enabled_pads for non stream-aware drivers?
>

mmm good question, I admit I might have not considered that part yet.

Streams API should go in a soon as Sakari's long awaited series hits
mainline, and I will certainly need to rebase soon, so I'll probably
get back to this.

Have you any idea about how this should be designed ?

Thanks
  j

> Anthony