Re: [PATCH] arm64: dts: qcom: hamoa-iot-evk: Enable display support

[Yongxing Mou]

On 2025/7/23 19:21, Dmitry Baryshkov wrote:
> On Wed, Jul 23, 2025 at 02:14:55PM +0800, Yongxing Mou wrote:
> > Enable DisplayPort support on all three USB-C ports of the
> > hamoa-iot-evk platform.
> >
> > Unlike most X1E-based boards, this platform uses FSUSB42 USB
> > switches for the USB0 Type-C port, while USB1 and USB2 rely on
> > Parade PS8830 retimers for Alt Mode switching.
> >
> > Support for the PS8830 retimers was already included in the
> > initial DTS, so this change adds support for the FSUSB42 switches.
> >
> > Due to limitations in the USB/DP combo PHY driver, DisplayPort
> > functionality is limited to 2 lanes instead of the maximum 4,
> > consistent with other X1E-based platforms.
> >
> > The platform also supports embedded DisplayPort (eDP) by default.
> >
> > Signed-off-by: Yongxing Mou <quic_yongmou@xxxxxxxxxxx>
> > ---
> > This change made top of initial DTS:
> > https://lore.kernel.org/all/20250716-hamoa_initial-v1-0-f6f5d0f9a163@xxxxxxxxxxxxxxxx/
> > ---
> >   arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts | 156 +++++++++++++++++++++++++++++
> >   1 file changed, 156 insertions(+)
> > +
> > +	ports {
> > +		port@1 {
> > +			reg = <1>;
> > +			mdss_dp3_out: endpoint {
>
> Add empty endpoint to x1e80100.dtsi, then patch it here like you do for
> all other DP endpoints.
Hi So i need to add mdss_dp3_out: endpoint {} in x1e80100.dtsi and 
+&mdss_dp3_out {
+       data-lanes = <0 1 2 3>;
...
in board dts..  is this understanding correct?

i just wondering that here can we just follow other x1e80100-based dts?
others 8 x1e80100-based board dts all introduce edp-panel in this way..
> > +				data-lanes = <0 1 2 3>;
> > +				link-frequencies = /bits/ 64 <1620000000 2700000000
> > +							      5400000000 8100000000>;
> > +
> > +				remote-endpoint = <&edp_panel_in>;
> > +			};
> > +		};
> > +	};
> > +};
> > +