uart_phy_read_register
err = uart_phy_read_register(fd, debug, q, &b);
err = uart_phy_read_register(fd, debug, SCMD_REG_REM_READ, &b);
err = uart_phy_read_register(fd, debug, SCMD_REG_REM_DATA_RD, &b);
err = uart_phy_read_register(fd, debug, SCMD_REG_REM_WRITE, &b);