diff mbox series

[2/2] serial: core: add comment about definitely used port types

Message ID 20230922063642.4120-3-wsa+renesas@sang-engineering.com
State New
Headers
Series serial: core: updates to uapi header |

Commit Message

Wolfram Sang Sept. 22, 2023, 6:36 a.m. UTC 
  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>
---
 include/uapi/linux/serial_core.h | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index 92e3dd56f631..46e06c483899 100644
--- a/include/uapi/linux/serial_core.h
+++ b/include/uapi/linux/serial_core.h
@@ -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