Re: [PATCH v9 5/6] serial: Support for RS-485 multipoint addresses
From: Lukas Wunner <lukas@wunner.de>
Date: 2022-09-20 11:20:23
Also in:
linux-arch, linux-doc, linux-serial, lkml
On Fri, Jun 24, 2022 at 11:42:09PM +0300, Ilpo Järvinen wrote:
ADDRB in termios indicates 9th bit addressing mode is enabled. In this mode, 9th bit is used to indicate an address (byte) within the communication line. ADDRB can only be enabled/disabled through ->rs485_config() that is also responsible for setting the destination and receiver (filter) addresses.
[...]
quoted hunk ↗ jump to hunk
--- a/include/uapi/asm-generic/termbits-common.h +++ b/include/uapi/asm-generic/termbits-common.h@@ -46,6 +46,7 @@ typedef unsigned int speed_t; #define EXTA B19200 #define EXTB B38400 +#define ADDRB 0x20000000 /* address bit */ #define CMSPAR 0x40000000 /* mark or space (stick) parity */ #define CRTSCTS 0x80000000 /* flow control */
You may want to consider submitting a patch to the Linux man-pages project to document the newly introduced bit: https://www.kernel.org/doc/man-pages/patches.html https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/man3/termios.3 Thanks, Lukas