reg_read_poll_tout
ret = reg_read_poll_tout(sc, FSPI_INTR, FSPI_INTR_IPRXWA,
ret = reg_read_poll_tout(sc, FSPI_INTR, FSPI_INTR_IPTXWE,
err = reg_read_poll_tout(sc, FSPI_STS0,
ret = reg_read_poll_tout(sc, FSPI_MCR0, FSPI_MCR0_SWRST, 1000, POLL_TOUT, 0);