Documentation: devices.txt: Update ttyUL major number allocation details

Describe when uartlite driver uses static/dynamic allocation for major
number based on maximum number of uartlite serial ports.

Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@amd.com>
Link: https://lore.kernel.org/r/20231116134003.3762725-2-manikanta.guntupalli@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/admin-guide/devices.txt b/Documentation/admin-guide/devices.txt
index 8390549235304f07ff29a283fa1f89a73d574727..94c98be1329a42def5a81307df77774f48645faf 100644 (file)
--- a/Documentation/admin-guide/devices.txt
+++ b/Documentation/admin-guide/devices.txt
@@ -2704,6 +2704,9 @@
                    ...
                 185 = /dev/ttyNX15             Hilscher netX serial port 15
                 186 = /dev/ttyJ0               JTAG1 DCC protocol based serial port emulation
+
+                If maximum number of uartlite serial ports is more than 4, then the driver
+                uses dynamic allocation instead of static allocation for major number.
                 187 = /dev/ttyUL0              Xilinx uartlite - port 0
                    ...
                 190 = /dev/ttyUL3              Xilinx uartlite - port 3