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@xxxxxxxx>
Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Max Filippov <jcmvbkbc@xxxxxxxxx>
---
include/uapi/linux/serial.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/uapi/linux/serial.h b/include/uapi/linux/serial.h
index 53bc1af67a41..070e50cf9e1e 100644
--- a/include/uapi/linux/serial.h
+++ b/include/uapi/linux/serial.h
@@ -47,6 +47,8 @@ struct serial_struct {
/*
* These are the supported serial types.
*/
+/* Generic type identifier for ports which type is not important to userspace. */
+#define PORT_ANY (-1)
#define PORT_UNKNOWN 0
#define PORT_8250 1
#define PORT_16450 2
--
2.30.2
