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

[Ernest Van Hoecke]

On Sun, Oct 25, 2026 at 12:43:20PM +0100, Ernest Van Hoecke wrote:
> Hi Frank,
> 
> On Fri, Oct 23, 2026 at 03:23:12PM -0500, Frank Li wrote:
> > 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 at toradex.com>
> > > > >
> > > > > 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 at toradex.com>
> > > > > ---
> > > > >  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.
> >
> 
> Yes, the Mezzanine has its own camera connector, wired to the second
> MIPI CSI-2 receiver of the i.MX8M Plus. Its GPIOs already go through a
> connector nexus of their own, defined in the Mezzanine overlays.
>  
> > Can you make imx8mp-verdin-mezzanine-ov5640.dtsi also standardize, like
> > use unified camera_i2c_2, camera_connector2, compre to imx8m-verdin-ov5640.dtso
> >
> 
> This is possible, but the labels used by imx8m-verdin-ov5640.dtso exist
> because that overlay is shared by Verdin iMX8M Mini and Verdin iMX8M Plus.
> The Mezzanine is specific to the Verdin iMX8M Plus and connects to its
> module-specific pins, which another module could wire differently. New
> labels in the SoM dtsi would become ABI with these overlays as their only
> user, so I would rather not add them. If a future Verdin module shares
> this connector, I will add the labels then.
>  
> > And avoid dtso include dtso file.  Now perfer only include dtsi file.
> > 
> > Frank
> 
> Okay I will go back to only including dtsi in v4 of this series, and
> also for the next SMARC series. Thanks.
> 
> Kind regards,
> Ernest

Hi Frank,

Just a heads-up that I'll be off in November so you can expect these
changes in December, together with v3 of SMARC iMX8MP camera series.

Thanks,
Ernest