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docs: i2c: summary: document 'local' and 'remote' targets

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Because Linux can be a target as well, add terminology to differentiate
between Linux being the target and Linux accessing targets.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Easwar Hariharan <eahariha@linux.microsoft.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
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Wolfram Sang 2024-06-21 09:30:12 +02:00
parent d77367fff7
commit 1e926ea190
1 changed files with 9 additions and 4 deletions
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Documentation/i2c/summary.rst
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@ -49,10 +49,15 @@ 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.
A **target** chip is a node that responds to communications when addressed
by the controller. In Linux it is called a **client**. Client drivers are kept
in a directory specific to the feature they provide, for example
``drivers/media/gpio/`` for GPIO expanders and ``drivers/media/i2c/`` for
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
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
**remote target**.
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