Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/ABI/testing/debugfs-moxtet b/Documentation/ABI/testing/debugfs-moxtet
new file mode 100644
index 0000000..67b1717
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-moxtet
@@ -0,0 +1,23 @@
+What: /sys/kernel/debug/moxtet/input
+Date: March 2019
+KernelVersion: 5.3
+Contact: Marek Behún <marek.behun@nic.cz>
+Description: (R) Read input from the shift registers, in hexadecimal.
+ Returns N+1 bytes, where N is the number of Moxtet connected
+ modules. The first byte is from the CPU board itself.
+ Example: 101214
+ 10: CPU board with SD card
+ 12: 2 = PCIe module, 1 = IRQ not active
+ 14: 4 = Peridot module, 1 = IRQ not active
+
+What: /sys/kernel/debug/moxtet/output
+Date: March 2019
+KernelVersion: 5.3
+Contact: Marek Behún <marek.behun@nic.cz>
+Description: (RW) Read last written value to the shift registers, in
+ hexadecimal, or write values to the shift registers, also
+ in hexadecimal.
+ Example: 0102
+ 01: 01 was last written, or is to be written, to the
+ first module's shift register
+ 02: the same for second module