Editing the device tree for P3767 SOM board to enable USB superspeed on both ports

[lefebvresam]

When I use the scarthgap branch, in conf/machine/include/tegra-common.inc there is a reference to:
PREFERRED_PROVIDER_virtual/kernel ?= "linux-jammy-nvidia-tegra"

When I want to update the device tree:
devtool modify virtual/kernel

I get a project in build/workspace based on https://github.com/OE4T/linux-jammy-nvidia-tegra.git with a folder 'arch/arm64/boot/dts/nvidia' not containing any tegra234 P3767 - P3768 related dts files.

ls -l arch/arm64/boot/dts/nvidia/
total 860
-rw-r--r-- 2 sam sam   1283 Jul 24 11:12 Makefile
-rw-r--r-- 2 sam sam  31836 Jul 24 11:12 tegra132-norrin.dts
-rw-r--r-- 2 sam sam  33899 Jul 24 11:12 tegra132.dtsi
-rw-r--r-- 2 sam sam  19265 Jul 24 11:12 tegra186-p2771-0000.dts
-rw-r--r-- 2 sam sam   8050 Jul 24 11:12 tegra186-p3310.dtsi
-rw-r--r-- 2 sam sam  13115 Jul 24 11:12 tegra186-p3509-0000+p3636-0001.dts
-rw-r--r-- 2 sam sam  58853 Jul 24 11:12 tegra186.dtsi
-rw-r--r-- 2 sam sam   7918 Jul 24 11:12 tegra194-p2888.dtsi
-rw-r--r-- 2 sam sam  17077 Jul 24 11:12 tegra194-p2972-0000.dts
-rw-r--r-- 2 sam sam    252 Jul 24 11:12 tegra194-p3509-0000+p3668-0000.dts
-rw-r--r-- 2 sam sam    249 Jul 24 11:12 tegra194-p3509-0000+p3668-0001.dts
-rw-r--r-- 2 sam sam  17010 Jul 24 11:12 tegra194-p3509-0000.dtsi
-rw-r--r-- 2 sam sam    712 Jul 24 11:12 tegra194-p3668-0000.dtsi
-rw-r--r-- 2 sam sam    401 Jul 24 11:12 tegra194-p3668-0001.dtsi
-rw-r--r-- 2 sam sam   5950 Jul 24 11:12 tegra194-p3668.dtsi
-rw-r--r-- 2 sam sam  81745 Jul 24 11:12 tegra194.dtsi
-rw-r--r-- 2 sam sam   7582 Jul 24 11:12 tegra210-p2180.dtsi
-rw-r--r-- 2 sam sam    236 Jul 24 11:12 tegra210-p2371-0000.dts
-rw-r--r-- 2 sam sam   7728 Jul 24 11:12 tegra210-p2371-2180.dts
-rw-r--r-- 2 sam sam    988 Jul 24 11:12 tegra210-p2530.dtsi
-rw-r--r-- 2 sam sam  42925 Jul 24 11:12 tegra210-p2571.dts
-rw-r--r-- 2 sam sam  42054 Jul 24 11:12 tegra210-p2595.dtsi
-rw-r--r-- 2 sam sam  51217 Jul 24 11:12 tegra210-p2597.dtsi
-rw-r--r-- 2 sam sam    189 Jul 24 11:12 tegra210-p2894-0050-a08.dts
-rw-r--r-- 2 sam sam  55441 Jul 24 11:12 tegra210-p2894.dtsi
-rw-r--r-- 2 sam sam  22076 Jul 24 11:14 tegra210-p3450-0000.dts
-rw-r--r-- 2 sam sam  56571 Jul 24 11:12 tegra210-smaug.dts
-rw-r--r-- 2 sam sam  54877 Jul 24 11:12 tegra210.dtsi
-rw-r--r-- 2 sam sam   4045 Jul 24 11:12 tegra234-p3701-0000.dtsi
-rw-r--r-- 2 sam sam  37138 Jul 24 11:14 tegra234-p3737-0000+p3701-0000.dts
-rw-r--r-- 2 sam sam    218 Jul 24 11:12 tegra234-p3737-0000.dtsi
-rw-r--r-- 2 sam sam    591 Jul 24 11:12 tegra234-sim-vdk.dts
-rw-r--r-- 2 sam sam 120833 Jul 24 11:12 tegra234.dtsi

I have in my conf files:
require conf/machine/p3768-0000-p3767-0003.conf
require conf/distro/poky.conf

Where:
`KERNEL_DEVICETREE ?= "tegra234-p3768-0000+p3767-0003-nv-super.dtb"'

The purpose is to find the right dts files to extend both USB ports using 3.0 superspeed.

There is a file tegra234-p3737-0000+p3701-0000.dts containing already three 3.0 configurations:

padctl@3520000 {
			status = "okay";

			pads {
				usb2 {
					lanes {
						usb2-0 {
							status = "okay";
						};

						usb2-1 {
							status = "okay";
						};

						usb2-2 {
							status = "okay";
						};

						usb2-3 {
							status = "okay";
						};
					};
				};

				usb3 {
					lanes {
						usb3-0 {
							status = "okay";
						};

						usb3-1 {
							status = "okay";
						};

						usb3-2 {
							status = "okay";
						};
					};
				};
			};

			ports {
				usb2-0 {
					mode = "otg";
					usb-role-switch;
					status = "okay";
					port {
						hs_typec_p1: endpoint {
							remote-endpoint = <&hs_ucsi_ccg_p1>;
						};
					};
				};

				usb2-1 {
					mode = "host";
					status = "okay";
					port {
						hs_typec_p0: endpoint {
							remote-endpoint = <&hs_ucsi_ccg_p0>;
						};
					};
				};

				usb2-2 {
					mode = "host";
					status = "okay";
				};

				usb2-3 {
					mode = "host";
					status = "okay";
				};

				usb3-0 {
					nvidia,usb2-companion = <1>;
					status = "okay";
					port {
						ss_typec_p0: endpoint {
							remote-endpoint = <&ss_ucsi_ccg_p0>;
						};
					};
				};

				usb3-1 {
					nvidia,usb2-companion = <0>;
					status = "okay";
					port {
						ss_typec_p1: endpoint {
							remote-endpoint = <&ss_ucsi_ccg_p1>;
						};
					};
				};

				usb3-2 {
					nvidia,usb2-companion = <3>;
					status = "okay";
				};
			};
		};

When I connect an USB3.0 enabled webcam on one of the ports I get (not enumerating to superspeed):

(EOS) 12:36 ~ # lsusb -t
/:  Bus 001.Port 001: Dev 001, Class=root_hub, Driver=tegra-xusb/4p, 480M
    |__ Port 003: Dev 002, If 0, Class=Video, Driver=[none], 480M
    |__ Port 003: Dev 002, If 1, Class=Video, Driver=[none], 480M
    |__ Port 003: Dev 002, If 2, Class=Video, Driver=[none], 480M
    |__ Port 003: Dev 002, If 3, Class=Video, Driver=[none], 480M
    |__ Port 003: Dev 002, If 4, Class=Video, Driver=[none], 480M
    |__ Port 003: Dev 002, If 5, Class=Human Interface Device, Driver=usbhid, 480M
/:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=tegra-xusb/4p, 10000M

And the other port is enumerating to superspeed:

(EOS) 12:36 ~ # lsusb -t
/:  Bus 001.Port 001: Dev 001, Class=root_hub, Driver=tegra-xusb/4p, 480M
/:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=tegra-xusb/4p, 10000M
    |__ Port 002: Dev 002, If 0, Class=Video, Driver=[none], 5000M
    |__ Port 002: Dev 002, If 1, Class=Video, Driver=[none], 5000M
    |__ Port 002: Dev 002, If 2, Class=Video, Driver=[none], 5000M
    |__ Port 002: Dev 002, If 3, Class=Video, Driver=[none], 5000M
    |__ Port 002: Dev 002, If 4, Class=Video, Driver=[none], 5000M
    |__ Port 002: Dev 002, If 5, Class=Human Interface Device, Driver=usbhid, 5000M

[kekiefer]

The devicetree files no longer live with the kernel recipe since the r36 release series. Now they are pulled from sources by the nvidia-kernel-oot recipe, and picked up by nvidia-kernel-oot-dtb.

An alternative example for building a custom dtb also exists: https://github.com/OE4T/tegra-demo-distro/blob/master/layers/meta-tegrademo/recipes-bsp/tegrademo-devicetree/tegrademo-devicetree_1.0.bb

[lefebvresam]

I did a lot of tests by changing the file kernel_tegra234-p3768-0000+p3767-0003-nv-super.dtb by decompile it, change USB setting and recompile it in the output folder and reflash the device, but the USB behavior is not changing. This must be something in the device that override this settings and I don't know what.