Allwinner A133 Usb Driver

Once your USB driver is correctly installed, follow these rules to avoid bricking your device:

(Assumes kernel with configfs)

One of the most complex aspects of the A133 USB driver is the Dual-Role Switching. allwinner a133 usb driver

When porting or debugging the A133 USB driver, engineers often encounter the following issues: Once your USB driver is correctly installed, follow

Cause: Faulty USB cable, incorrect FEL button timing, or a dead battery on the A133 device. (Assumes kernel with configfs)

Solution:

Below is a representative structure of the A133 OTG node in the DTS:

usb_otg: usb@5100000 
    compatible = "allwinner,sun50i-a133-otg", "snps,dwc2";
    reg = <0x05100000 0x10000>;
    interrupts = <GIC_SPI 23 IRQ_TYPE_LEVEL_HIGH>;
    clocks = <&ccu CLK_BUS_OTG>;
    resets = <&ccu RST_BUS_OTG>;
    dr_mode = "otg"; /* Options: "host", "peripheral", "otg" */
    g-rx-fifo-size = <256>;
    g-np-tx-fifo-size = <32>;
    g-tx-fifo-size = <128 128 128>;
    status = "okay";
;