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.
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| @@ -231,4 +231,7 @@ · 230 unmodified lines | ||
| 231 | 231 | /* Sunplus UART */ |
| 232 | 232 | #define PORT_SUNPLUS 123 |
| 233 | 233 | |
| 234 | +/* Generic type identifier for ports which type is not important to userspace. */ | |
| 235 | +#define PORT_GENERIC (-1) | |
| 236 | + | |
| 234 | 237 | #endif /* _UAPILINUX_SERIAL_CORE_H */ |