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

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Message-Id: <20250925105508.2323797-1-Anthony.McGivern@arm.com>
Date: Thu, 25 Sep 2025 11:55:08 +0100
From: Anthony McGivern <Anthony.McGivern@....com>
To: jacopo.mondi@...asonboard.com
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Subject: [PATCH v2 12/27] media: v4l2-subdev: Introduce v4l2 subdev context

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?

Anthony