RE: [PATCH v3 13/13] arm64: dts: renesas: Add LVDS overlay for RZ/G3L SMARC EVK with ITE6263

[Biju Das]

Hi Geert,


> -----Original Message-----
> From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Sent: 09 September 2026 08:44
> Subject: Re: [PATCH v3 13/13] arm64: dts: renesas: Add LVDS overlay for RZ/G3L SMARC EVK with ITE6263
> 
> Hi Biju,
> 
> On Wed, 9 Sept 2026 at 04:57, Biju Das <biju.das.jz@xxxxxxxxxxxxxx> wrote:
> > > From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> On Wed, 26 Aug 2026
> > > at 19:49, Biju <biju.das.au@xxxxxxxxx> wrote:
> > > > Add a Device Tree overlay (r9a08g046l48-smarc-lvds-ite6263.dtso)
> > > > for the RZ/G3L (R9A08G046) SMARC EVK board to support LVDS-to-HDMI
> > > > output via the ITE 6263 HDMI transmitter.
> > > >
> > > > The overlay enables the LVDS controller and the display unit
> > > > (DU/LCDC), and configures the ITE6263 on I2C2.
> > > >
> > > > Update the Makefile to build the overlay as both a standalone
> > > > .dtbo and a composite .dtb (base DTB + overlay).
> > > >
> > > > Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> 
> > > > --- /dev/null
> > > > +++ b/arch/arm64/boot/dts/renesas/r9a08g046l48-smarc-lvds-ite6263.
> > > > +++ dtso
> 
> > > > +&{/} {
> > > > +       lvds-to-hdmi-out {
> > > > +               compatible = "hdmi-connector";
> > > > +               type = "d";
> > > > +
> > > > +               port {
> > > > +                       lvds_to_hdmi_con_out: endpoint {
> > > > +                               remote-endpoint = <&it6263_out>;
> > > > +                       };
> > > > +               };
> > >
> > > No DDC?
> >
> > The driver uses parent i2c bus as ddc-i2c-bus. That is the reason not added.
> 
> Neat trick. Do you know where that is handled? I couldn't find it.

https://elixir.bootlin.com/linux/v7.3-rc1/source/drivers/gpu/drm/bridge/ite-it6263.c#L527

Cheers,
Biju