CAR_CLK_ENB_U_SET_REG
CAR_CLK_ENB_U_SET_REG, CAR_CLK_ENB_U_CLR_REG, \
CAR_CLK_ENB_U_SET_REG, CAR_CLK_ENB_U_CLR_REG, \
bus_space_write_4(bst, bsh, CAR_CLK_ENB_U_SET_REG, CAR_DEV_U_AFI);
bus_space_write_4(bst, bsh, CAR_CLK_ENB_U_SET_REG, CAR_DEV_U_PCIE);