Dear @eoin_oc1 ,
Have you set anything from your device tree already? On the Linux Kernel Github you can find an example of what would be needed for a device for this device: https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/usb/usb251xb.txt .
Also, in figure 25 of our carrier board design guide, you can see the following sample of the USB Hubs we made for the Verdin Carrier Boards:
. As you correctly said, on the Dahlia and on the Dev Board, the USB2 is the one used for the Hub connection. Here is where you can find its information on our device trees:
assigned-clock-rates = <500000000>;
interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
phys = <&usb3_phy0>, <&usb3_phy0>;
phy-names = "usb2-phy", "usb3-phy";
snps,dis-u2-freeclk-exists-quirk;
status = "disabled";
};
};
usb3_phy1: usb-phy@382f0040 {
compatible = "fsl,imx8mp-usb-phy";
reg = <0 0x382f0040 0 0x40>;
clocks = <&clk IMX8MP_CLK_USB_PHY_ROOT>;
clock-names = "phy";
assigned-clocks = <&clk IMX8MP_CLK_USB_PHY_REF>;
assigned-clock-parents = <&clk IMX8MP_CLK_24M>;
#phy-cells = <0>;
status = "disabled";
};
&usb_dwc3_0 {
extcon = <&extcon_usb_1_id>;
dr_mode = "otg";
hnp-disable;
srp-disable;
adp-disable;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usb1_en>;
};
/* Verdin USB_2 */
&usb3_phy1 {
fsl,phy-tx-preemp-amp-tune = <2>;
};
&usb_dwc3_1 {
dr_mode = "host";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usb2_en>;
};
Do you think that these files can help you?
Best regards,
