STM32MP157F-DK2 Connection to Raspberry Pi 7 inch screen v1.1

[tannerg02]

Hello,

I have been trying for some time now to connect a Raspberry Pi 7" screen to my STM32MP157F development kit, as the screen that comes with it is too small for my purposes. I do not have a large amount of experience with embedded systems or working at the Linux kernel level. I have been referencing the display wiki page, however I have not been able to get the screen to output anything, only for the backlight to turn on. I have been plugging in the 15 pin connector into the 20 pin CN4 port on the board, which is stated to work on the wiki. I have seen this adapter  referenced online, but I would rather not have to order it if not necessary as I am on a time crunch. I have tried many different device tree configurations, in addition to the example given on the wiki. I am at a loss here, and would greatly appreciate any guidance. Below is snippet from my device tree, which I have modified from the wiki. 

&dsi {
	status = "okay";

	ports {
		port@0 {
			reg = <0>;
			dsi_in: endpoint {
				remote-endpoint = <&ltdc_ep1_out>;
			};
		};

		port@1 {
			reg = <1>;
			dsi_out: endpoint {
				remote-endpoint = <&bridge_in>;
			};
		};
	};

	bridge@0 {
		compatible = "toshiba,tc358762";
		reg = <0>;
		vddc-supply = <&reg_rpi>;
		status = "okay";

		ports {
			#address-cells = <1>;
			#size-cells = <0>;

			port@0 {
				reg = <0>;
				bridge_in: endpoint {
					remote-endpoint = <&dsi_out>;
				};
			};
			port@1 {
				reg = <1>;
				bridge_out: endpoint {
					remote-endpoint = <&panel_in>;
				};
			};
		};
	};
};

/ {
    panel-rgb {
        compatible = "panel-dpi";
        power-supply = <&reg_rpi>;
        status = "okay";

        port {
            panel_in: endpoint {
                remote-endpoint = <&bridge_out>;
            };
        };
    };
};
&i2c1 {
	reg_rpi: regulator@45 {
		compatible = "raspberrypi,7inch-touchscreen-panel-regulator";
		reg = <0x45>;
		vin-supply = <&v3v3>;
		status = "okay";
	};
};

However, from what I understand the output of i2cdetect reveals that the screen itself is never detected, as it would show up in row 40.

root@stm32mp1-e5-59-0e:~# i2cdetect -y 1

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f

00:                         -- -- -- -- -- -- -- -- 

10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

20: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- 

30: -- -- -- UU -- -- -- -- -- -- -- -- -- -- -- -- 

40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

70: -- -- -- -- -- -- -- --                     

Thanks,

Tanner