Wolfram Sang 00c77bcf2a serial: core: add comment about definitely used port types
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>
2023-10-03 14:57:12 +02:00
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