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serial: add PORT_GENERIC definition

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Current pattern in the linux kernel is that every new serial driver adds
one or more new PORT_ definitions because uart_ops::config_port()
callback documentation prescribes setting port->type according to the
type of port found, or to PORT_UNKNOWN if no port was detected.

When the specific type of the port is not important to the userspace
there's no need for a unique PORT_ value, but so far there's no suitable
identifier for that case.

Provide generic port type identifier other than PORT_UNKNOWN for ports
which type is not important to userspace.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Suggested-by: Jiri Slaby <jirislaby@kernel.org>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20231008001804.889727-1-jcmvbkbc@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Max Filippov 2023-10-07 17:18:04 -07:00 committed by Greg Kroah-Hartman
parent 3047b5b53c
commit c7c5be5862
1 changed files with 3 additions and 0 deletions
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3
include/uapi/linux/serial_core.h
View file

@ -231,4 +231,7 @@
/* Sunplus UART */
#define PORT_SUNPLUS 123
/* Generic type identifier for ports which type is not important to userspace. */
#define PORT_GENERIC (-1)
#endif /* _UAPILINUX_SERIAL_CORE_H */