EUSB2_TUNE_IUSB2
regmap_write(regmap, base + EUSB2_TUNE_IUSB2, val);
{ EUSB2_TUNE_IUSB2, 0x8 },
{ EUSB2_TUNE_IUSB2, 0x5 },
{ EUSB2_TUNE_IUSB2, 0x4 },