Re: [PATCH v3 4/4] arm64: dts: freescale: imx8mp-verdin: Add mezzanine OV5640 overlays

[Frank Li]

On Fri, Oct 23, 2026 at 03:51:17PM +0200, Ernest Van Hoecke wrote:
> On Thu, Oct 22, 2026 at 05:20:48PM -0400, Frank Li wrote:
> > On Thu, Oct 22, 2026 at 04:31:28PM +0200, Ernest Van Hoecke wrote:
> > > From: Ernest Van Hoecke <ernest.vanhoecke@xxxxxxxxxxx>
> > >
> > > The Verdin iMX8M Plus exposes its second MIPI CSI-2 interface through the
> > > Verdin iMX8M Plus Mezzanine. Add overlays for using a Toradex OV5640 camera
> > > on this interface.
> > >
> > > The mezzanine can route the camera control signals through two jumper
> > > configurations. Describe each configuration as a GPIO nexus mapping so the
> > > camera description remains independent of the physical routing.
> > >
> > > The default positions share the native CSI_1 GPIOs and are intended for a
> > > single camera. The alternate positions permit simultaneous native and
> > > mezzanine cameras, but conflict with the Atmel MXT touchscreen GPIO.
> > >
> > > The current camera set uses a 27 MHz on-board oscillator. The legacy camera
> > > module uses 24 MHz, so provide variants for both.
> > >
> > > Link: https://developer.toradex.com/hardware/verdin-som-family/add-ons/verdin-imx8m-plus-mezzanine/
> > > Link: https://developer.toradex.com/hardware/accessories/cameras/csi-camera-module-5mp-ov5640-arducam
> > > Link: https://developer.toradex.com/hardware/legacy-products/other/csi-camera-module-5mp-ov5640/
> > > Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@xxxxxxxxxxx>
> > > ---
> > >  arch/arm64/boot/dts/freescale/Makefile             | 19 ++++++
> > >  ...-verdin-mezzanine-ov5640-24mhz-alt-jumpers.dtso | 19 ++++++
> > >  ...din-mezzanine-ov5640-24mhz-default-jumpers.dtso | 18 +++++
> > >  ...imx8mp-verdin-mezzanine-ov5640-alt-jumpers.dtso | 38 +++++++++++
> > >  ...mp-verdin-mezzanine-ov5640-default-jumpers.dtso | 42 ++++++++++++
> > >  .../freescale/imx8mp-verdin-mezzanine-ov5640.dtsi  | 78 ++++++++++++++++++++++
> >
> > why not share with imx8m-verdin-ov5640.dtsi, which is almost the same.
> >
> > Frank
>
> Hi Frank,
>
> Both camera modules have their own oscillator, and the native and
> Mezzanine connectors have their own supply, so each overlay describes its
> own clock and regulator nodes. They also use a different I2C bus, CSI
> receiver and connector. Both overlays are applied together for two
> cameras (imx8mp-verdin-wifi-dev-dual-ov5640),

Okay, I see share one imx8m-verdin-ov5640.dtso

> so their node names and
> labels must be unique, and a single .dtsi cannot be included twice.

mezzanine actually connect by another connectors ? so it need new one files
because current nexus node's limitation.

Can you make imx8mp-verdin-mezzanine-ov5640.dtsi also standardize, like
use unified camera_i2c_2, camera_connector2, compre to imx8m-verdin-ov5640.dtso

And avoid dtso include dtso file.  Now perfer only include dtsi file.

Frank

>
> The connector nexus makes the GPIOs independent of the routing, but an
> overlay still has to name the connector, bus and receiver it uses. One
> overlay for either connector would need the target to be chosen when it
> is applied, which is what the DT connector/addon work is about, so sadly
> we have to wait for that to make things more generic.
>
> What is left in common is a few constant sensor properties, so I would
> like to keep the two files.
>
> Thanks for your input and best regards,
> Ernest
>