From 6056f20f27e99fb67582f299468328505f130e36 Mon Sep 17 00:00:00 2001 From: Crescent CY Hsieh Date: Fri, 1 Dec 2023 15:15:54 +0800 Subject: tty: serial: Add RS422 flag to struct serial_rs485 Add "SER_RS485_MODE_RS422" flag to struct serial_rs485, so that serial port can switch interface into RS422 if supported by using ioctl command "TIOCSRS485". By treating RS422 as a mode of RS485, which means while enabling RS422 there are two flags need to be set (SER_RS485_ENABLED and SER_RS485_MODE_RS422), it would make things much easier. For example some places that checks for "SER_RS485_ENABLED" won't need to be rewritten. Signed-off-by: Crescent CY Hsieh Link: https://lore.kernel.org/r/20231201071554.258607-3-crescentcy.hsieh@moxa.com Signed-off-by: Greg Kroah-Hartman --- include/uapi/linux/serial.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/uapi') diff --git a/include/uapi/linux/serial.h b/include/uapi/linux/serial.h index 6c75ebdd7797..9086367db043 100644 --- a/include/uapi/linux/serial.h +++ b/include/uapi/linux/serial.h @@ -138,6 +138,7 @@ struct serial_icounter_struct { * * %SER_RS485_ADDRB - Enable RS485 addressing mode. * * %SER_RS485_ADDR_RECV - Receive address filter (enables @addr_recv). Requires %SER_RS485_ADDRB. * * %SER_RS485_ADDR_DEST - Destination address (enables @addr_dest). Requires %SER_RS485_ADDRB. + * * %SER_RS485_MODE_RS422 - Enable RS422. Requires %SER_RS485_ENABLED. */ struct serial_rs485 { __u32 flags; @@ -149,6 +150,7 @@ struct serial_rs485 { #define SER_RS485_ADDRB _BITUL(5) #define SER_RS485_ADDR_RECV _BITUL(6) #define SER_RS485_ADDR_DEST _BITUL(7) +#define SER_RS485_MODE_RS422 _BITUL(8) __u32 delay_rts_before_send; __u32 delay_rts_after_send; -- cgit v1.2.3