Re: [PATCH 6/8] arm64: dts: freescale: imx8mm-verdin: Add Toradex OV5640 CSI Cameras

[Francesco Dolcini <francesco@dolcini.it>]

Hello Kieran,

On Wed, Jul 22, 2026 at 11:30:29AM +0100, Kieran Bingham wrote:
> Quoting Ernest Van Hoecke (2026-07-22 10:27:32)
> > On Mon, Jul 20, 2026 at 02:16:46PM -0400, Frank Li wrote:
> > > On Mon, Jul 13, 2026 at 05:06:27PM +0200, Ernest Van Hoecke wrote:
> > > > From: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
> > > >
> > > > Add device tree overlays for the Toradex OV5640 CSI Camera on Verdin CSI_1.
> > > >
> > > > The default overlay describes the current CSI Camera Set 5MP OV5640 with a
> > > > 27 MHz on-board oscillator. Add a separate 24 MHz overlay for the legacy
> > > > camera module.
> > > >
> > > > Link: https://developer.toradex.com/hardware/accessories/cameras/csi-camera-module-5mp-ov5640-arducam
> > > > Link: https://www.toradex.com/accessories/csi-camera-ov5640
> > > > Link: https://developer.toradex.com/hardware/legacy-products/other/csi-camera-module-5mp-ov5640/
> > > > Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@toradex.com>
> > > > ---
> > > >  arch/arm64/boot/dts/freescale/Makefile             |  6 ++
> > > >  .../dts/freescale/imx8mm-verdin-ov5640-24mhz.dtso  | 17 +++++
> > > >  .../boot/dts/freescale/imx8mm-verdin-ov5640.dtsi   | 78 ++++++++++++++++++++++
> > > >  .../boot/dts/freescale/imx8mm-verdin-ov5640.dtso   | 18 +++++
> > > >  4 files changed, 119 insertions(+)
...
> I think with the Toradex ecosystem there would be some value in
> supporting or helping with the ongoing dt-connectors or dt-addons topics
> so that we can abstract the hardware which is being 'added'.
> 
> I think it's important that we tackle the problem of combinatorial
> explosions of overlays when we can add a component to multiple
> platforms.
> 
> For example, your OV5640 camera could be added to many different boards
> - and each board could have many different cameras - in different ports.
> 
> We should not be copy/pasting overlays for each combination, or we'll
> have 'thousands' of identical overlays.

I see your point, and I agree that it would be valuable to move this
topic forward. I will raise it internally at Toradex and see how we can
contribute.

At the same time, quoting Marex (https://lore.kernel.org/all/dec2a7f6-80fd-4692-8936-969f8837a555@nabladev.com/):

 | DT connectors have been discussed for the last 10 or so years and three 
 | is still no real progress.
 | 
 | I would be happy to send a follow up patchset which would convert the 
 | DTOs to whatever connector implementation format lands in the future, 
 | but I am concerned that waiting for DT connectors will block this 
 | patchset from landing for a long time.


Francesco