This not only includes rewording, but also where to put which emphasis
on terms in this document.
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/i2c/summary.rst | 33 ++++++++++++++++++++-------------
1 file changed, 20 insertions(+), 13 deletions(-)
diff --git a/Documentation/i2c/summary.rst b/Documentation/i2c/summary.rst
index ff8bda32b9c3..90f46f1504fe 100644
--- a/Documentation/i2c/summary.rst
+++ b/Documentation/i2c/summary.rst
@@ -31,9 +31,7 @@ implement all the common SMBus protocol semantics or messages.
Terminology
===========
-The I2C bus connects one or more *controller* chips and one or more *target*
-chips.
-
+The I2C bus connects one or more controller chips and one or more target chips.
.. kernel-figure:: i2c_bus.svg
:alt: Simple I2C bus with one controller and 3 targets
@@ -41,16 +39,16 @@ chips.
Simple I2C bus
A **controller** chip is a node that starts communications with targets. In the
-Linux kernel implementation it is called an **adapter** or bus. Adapter
-drivers are in the ``drivers/i2c/busses/`` subdirectory.
+Linux kernel implementation it is called an "adapter" or "bus". Controller
+drivers are usually in the ``drivers/i2c/busses/`` subdirectory.
-An **algorithm** contains general code that can be used to implement a
-whole class of I2C adapters. Each specific adapter driver either depends on
-an algorithm driver in the ``drivers/i2c/algos/`` subdirectory, or includes
-its own implementation.
+An **algorithm** contains general code that can be used to implement a whole
+class of I2C controllers. Each specific controller driver either depends on an
+algorithm driver in the ``drivers/i2c/algos/`` subdirectory, or includes its
+own implementation.
A **target** chip is a node that responds to communications when addressed by a
-controller. In the Linux kernel implementation it is called a **client**. While
+controller. In the Linux kernel implementation it is called a "client". While
targets are usually separate external chips, Linux can also act as a target
(needs hardware support) and respond to another controller on the bus. This is
then called a **local target**. In contrast, an external chip is called a
@@ -60,9 +58,18 @@ Target drivers are kept in a directory specific to the feature they provide,
for example ``drivers/gpio/`` for GPIO expanders and ``drivers/media/i2c/`` for
video-related chips.
-For the example configuration in figure, you will need a driver for your
-I2C adapter, and drivers for your I2C devices (usually one driver for each
-device).
+For the example configuration in the figure above, you will need one driver for
+the I2C controller, and drivers for your I2C targets. Usually one driver for
+each target.
+
+Synonyms
+--------
+
+As mentioned above, the Linux I2C implementation historically uses the terms
+"adapter" for controller and "client" for target. A number of data structures
+have these synonyms in their name. So, to discuss implementation details, it
+might be easier to use these terms. If speaking about I2C in general, the
+official terminology is preferred.
Outdated terminology
--------------------
--
2.43.0
