Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/i2c/index.rst b/Documentation/i2c/index.rst
new file mode 100644
index 0000000..cd8d020
--- /dev/null
+++ b/Documentation/i2c/index.rst
@@ -0,0 +1,37 @@
+. SPDX-License-Identifier: GPL-2.0
+
+===================
+I2C/SMBus Subsystem
+===================
+
+.. toctree::
+   :maxdepth: 1
+
+   dev-interface
+   dma-considerations
+   fault-codes
+   functionality
+   gpio-fault-injection
+   i2c-protocol
+   i2c-stub
+   i2c-topology
+   instantiating-devices
+   old-module-parameters
+   slave-eeprom-backend
+   slave-interface
+   smbus-protocol
+   summary
+   ten-bit-addresses
+   upgrading-clients
+   writing-clients
+
+   muxes/i2c-mux-gpio
+
+   busses/index
+
+.. only::  subproject and html
+
+   Indices
+   =======
+
+   * :ref:`genindex`