Starting Point is the Radxa DTS

needed to add an include ...

#include <dt-bindings/soc/rockchip,vop2.h>

Modified this section. Changed the compatible string, added the power-supply key and fixed the active area (width and height)
 

dsi0_panel: panel@0 {
        status = "okay";
        compatible = "panel-dsi-simple";
        reg = <0>;
        backlight = <&dsi0_backlight>;

        power-supply = <&vcc_lcd_mipi0>;
        vdd-supply = <&vcc_lcd_mipi0>;
        vccio-supply = <&vcc_1v8_s0>;
        reset-gpios = <&gpio3 RK_PC1 GPIO_ACTIVE_HIGH>;
        pinctrl-names = "default";
        pinctrl-0 = <&dsi0_lcd_rst_gpio>;

        prepare-delay-ms = <120>;
        reset-delay-ms = <120>;
        init-delay-ms = <120>;
        enable-delay-ms = <100>;
        disable-delay-ms = <120>;
        unprepare-delay-ms = <120>;

        width-mm = <135>;
        height-mm = <217>;

Modified this section (renamed the endpoint)

&mipi_dcphy0 {
    status = "okay";
};

&route_dsi0 {
    status = "okay";
    connect = <&vp3_out_dsi0>;
};

&dsi0_in_vp2 {
    status = "disabled";
};

&dsi0_in_vp3 {
    status = "okay";
};

to simply

&mipidcphy0 {
    status = "okay";
};

Added this section / endpoint

&vp3 {
    #address-cells = <1>;
    #size-cells = <0>;
    vp3_out_dsi0: endpoint@ROCKCHIP_VOP2_EP_MIPI0 {
        reg = <ROCKCHIP_VOP2_EP_MIPI0>;
        remote-endpoint = <&dsi0_in_vp3>;
    };
};

And then completely redid the i2c touch controller section to be
 

&i2c5 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&i2c5m2_xfer>;
    clock-frequency = <400000>;
    #address-cells = <1>;
    #size-cells = <0>;

    gt9xx: gt9271@14 {
        status = "okay";
        compatible = "goodix,gt9271";
        reg = <0x14>;
        pinctrl-names = "default";
        pinctrl-0 = <&gt9xx_gpio>;
        interrupt-parent = <&gpio3>;
        interrupts = <RK_PC6 IRQ_TYPE_EDGE_FALLING>;
        irq-gpios = <&gpio3 RK_PC6 GPIO_ACTIVE_HIGH>;
        reset-gpios = <&gpio3 RK_PC5 GPIO_ACTIVE_HIGH>;
        touchscreen-size-x = <1200>;
        touchscreen-size-y = <1920>;
        AVDD28-supply = <&vcc_tp>;
        VDDIO-supply = <&vcc_tp>;
    };

Final DTS is attached.

Worked for 6.18.53.

I had Claude write a bash script to pull everything and make the required changes and compile the device tree and can make it available, if needed.
 

rock-5a-radxa-display-10fhd.dts