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serial: core: add comment about definitely used port types

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When port type 18 was removed, it was deduced that the code could go but
its define has to stay because it is used in userspace. Share that
knowledge by adding a comment about it.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20230922063642.4120-3-wsa+renesas@sang-engineering.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wolfram Sang 2023-09-22 08:36:42 +02:00 committed by Greg Kroah-Hartman
parent b02d006194
commit 00c77bcf2a
1 changed files with 2 additions and 0 deletions
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2
include/uapi/linux/serial_core.h
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@ -11,6 +11,8 @@
* The type definitions. These are from Ted Ts'o's serial.h
* By historical reasons the values from 0 to 13 are defined
* in the include/uapi/linux/serial.h, do not define them here.
* Values 0 to 19 are used by setserial from busybox and must never
* be modified.
*/
#define PORT_NS16550A 14
#define PORT_XSCALE 15