[PATCH v2 01/28] docs: i2c: sort index logically

[Luca Ceresoli]

The index page currently lists sections in alphabetical file order without
caring about their content. Sort sections based on their content logically,
according to the following structure:

 * Intro to I2C/SMBus and their usage in Linux: summary, i2c-protocol,
   smbus-protocol, instantiating-devices, busses/index, i2c-topology,
   muxes/i2c-mux-gpio
 * Implementing drivers: writing-clients, dev-interface,
   dma-considerations, fault-codes, functionality
 * Debugging: gpio-fault-injection, i2c-stub
 * Slave I2C: slave-interface, slave-eeprom-backend
 * Advanced: ten-bit-addresses
 * Obsolete info: upgrading-clients, old-module-parameters

Signed-off-by: Luca Ceresoli <luca@xxxxxxxxxxxxxxxx>
Reviewed-by: Jean Delvare <jdelvare@xxxxxxx>

---

Changes in v2:
 - split sections in groups (suggested by Jean Delvare)
 - remove consecutive blank lines (reported by Jean Delvare)
---
 Documentation/i2c/index.rst | 59 ++++++++++++++++++++++++++++++-------
 1 file changed, 48 insertions(+), 11 deletions(-)

diff --git a/Documentation/i2c/index.rst b/Documentation/i2c/index.rst
index a0fbaf6d0675..f0f3b9c97abb 100644
--- a/Documentation/i2c/index.rst
+++ b/Documentation/i2c/index.rst
@@ -4,30 +4,67 @@
 I2C/SMBus Subsystem
 ===================
 
+Introduction
+============
+
+.. toctree::
+   :maxdepth: 1
+
+   summary
+   i2c-protocol
+   smbus-protocol
+   instantiating-devices
+   busses/index
+   i2c-topology
+   muxes/i2c-mux-gpio
+
+
+Writing device drivers
+======================
+
 .. toctree::
    :maxdepth: 1
 
+   writing-clients
    dev-interface
    dma-considerations
    fault-codes
    functionality
+
+Debugging
+=========
+
+.. toctree::
+   :maxdepth: 1
+
    gpio-fault-injection
-   i2c-protocol
    i2c-stub
-   i2c-topology
-   instantiating-devices
-   old-module-parameters
-   slave-eeprom-backend
+
+Slave I2C
+=========
+
+.. toctree::
+   :maxdepth: 1
+
    slave-interface
-   smbus-protocol
-   summary
+   slave-eeprom-backend
+
+Advanced topics
+===============
+
+.. toctree::
+   :maxdepth: 1
+
    ten-bit-addresses
-   upgrading-clients
-   writing-clients
 
-   muxes/i2c-mux-gpio
+Legacy documentation
+====================
 
-   busses/index
+.. toctree::
+   :maxdepth: 1
+
+   upgrading-clients
+   old-module-parameters
 
 .. only::  subproject and html
 
-- 
2.25.0