wait_for_latch
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_WRITE_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);