Commit 79d713ba authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Greg Kroah-Hartman
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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: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240304123035.758700-3-andriy.shevchenko@linux.intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 35c822a3

include/linux/serial_core.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */