EUSB2_TUNE_USB2_PREEM
regmap_write(regmap, base + EUSB2_TUNE_USB2_PREEM, val);
{ EUSB2_TUNE_USB2_PREEM, 0x5 },
{ EUSB2_TUNE_USB2_PREEM, 0x2 },
{ EUSB2_TUNE_USB2_PREEM, 0x0 },