95 struct uart_8250_port {  struct
96 	struct uart_port	port;
97 	struct timer_list	timer;		/* "no irq" timer */
98 	struct list_head	list;		/* ports on this IRQ */
99 	u32			capabilities;	/* port capabilities */
100 	unsigned short		bugs;		/* port bugs */
101 	bool			fifo_bug;	/* min RX trigger if enabled */
102 	unsigned int		tx_loadsz;	/* transmit fifo load size */
103 	unsigned char		acr;
104 	unsigned char		fcr;
105 	unsigned char		ier;
106 	unsigned char		lcr;
107 	unsigned char		mcr;
108 	unsigned char		cur_iotype;	/* Running I/O type */
132 	int			(*dl_read)(struct uart_8250_port *);  argument
133 	void			(*dl_write)(struct uart_8250_port *, int);  argument
136 	void			(*rs485_start_tx)(struct uart_8250_port *);  argument
137 	void			(*rs485_stop_tx)(struct uart_8250_port *);  argument
144 static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up)  in up_to_u8250p()  argument