Cyclone5 SoC: U-Boot not detecting USB-HUB

Hi teiram,

Let's try these:

1. Do you have a PHY node for USB3300 in the your previous working u-boot? Something like the example below. Add it into the dtsi:

{
    /* Define the PHY node outside the soc bus */
    usb_phy0: usb-phy {
        compatible = "usb-nop-xceiv";
        #phy-cells = <0>;
        reset-gpios = <&portb 0 GPIO_ACTIVE_LOW>; 
        status = "okay";
    };
};

&usb1 {
    status = "okay";
    dr_mode = "host";             // Usually 'host' for Cyclone V boards
    usb-phy = <&usb_phy0>;        // Link to the PHY node
};

2. Make sure the Linux kconfig options (set in defconfig) are set:

CONFIG_USB_DWC2=y
CONFIG_USB_OHCI_HCD=y --- sometimes needed for full/low speed support
CONFIG_PHY=y
CONFIG_NOP_USB_XCEIV=y --- Essential if using the usb-nop-xceiv compatible string.
CONFIG_USB_ULPI=y --- Required for the ULPI interface protocol.

3. The USB3300 or an downstream hub requires specific GPIO states to be enabled before the USB stack starts. You can do this in U-Boot with:

gpio set 9
usb start