When I connect the Jetson tx2 on our custom board it is not probing the USB hardware, Please check why it is not probing the USB… Customboard.txt (3.0 KB)
Since we are using only using usb0 otg port as device/host in our end device, This are the signal conditions…
USB0_D+ = connected to USB port
USB0_D- = connected to USB port
USB0_VBUS_DET = Connected to 5V
USB0_OTG_ID = Not connected floating
USB0_EN_OC = Not connected floating
All other USB connection are pulled low
It is not just related to which hardware is in use. If you change the board design, then the software side change is required.
Even changing a power source may also need to change the software. Please refer to the adaptation guide inside our developer guide document and change the device tree to match your board.
After spending some time on debugging the USB code
I figured out that ,if I changed the following linw TEGRA186_UTMI_PHYS to 2, Then usb0 otg starts working,
I saw the failure come from the following file, if TEGRA186_UTMI_PHYS is 3
in file
drivers/phy/tegra/xusb.c
function
static int tegra_xusb_usb2_port_parse_dt (struct tegra_xusb_usb2_port *usb2)
line
usb2->supply = devm_regulator_get(&port->dev, “vbus”);
if (IS_ERR(usb2->supply))
return PTR_ERR(usb2->supply);
==>Can you help me with what dts entry, I have to change, to get the same thing resolved… I did not understand how to change dts only, to do the same thing work without actually changing the kernel code…
==>Also, what does it means to change TEGRA186_UTMI_PHYS to 2 … what happens to the USB subsystem initialization… Can you explain