From: Andy Shevchenko Date: Mon, 4 Mar 2024 12:27:03 +0000 (+0200) Subject: serial: core: Add UPIO_UNKNOWN constant for unknown port type X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=79d713baf63c8f23cc58b304c40be33d64a12aaf;p=linux.git serial: core: Add UPIO_UNKNOWN constant for unknown port type In some APIs we would like to assign the special value to iotype and compare against it in another places. Introduce UPIO_UNKNOWN for this purpose. Note, we can't use 0, because it's a valid value for IO port access. Signed-off-by: Andy Shevchenko Link: https://lore.kernel.org/r/20240304123035.758700-3-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index f9d7f0a625fdd..3b64c9a269458 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -470,6 +470,7 @@ struct uart_port { unsigned char iotype; /* io access style */ +#define UPIO_UNKNOWN ((unsigned char)~0U) /* UCHAR_MAX */ #define UPIO_PORT (SERIAL_IO_PORT) /* 8b I/O port access */ #define UPIO_HUB6 (SERIAL_IO_HUB6) /* Hub6 ISA card */ #define UPIO_MEM (SERIAL_IO_MEM) /* driver-specific */