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doc: clarify what a subsystem is

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Clarify what a subsystem is, this has been missing the docs.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
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Anas Nashif 2024-04-12 07:01:55 -04:00 • committed by Carles Cufí
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doc/glossary.rst
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@ -140,6 +140,10 @@ Glossary of Terms
A number of different :term:`SoCs <SoC>` that share similar characteristics and
features, and that the vendor typically names and markets together.
subsystem
A subsystem refers to a logically distinct part of the operating system
that handles specific functionality or provides certain services.
system power state
System power states describe the power consumption of the system as a
whole. System power states are represented by :c:enum:`pm_state`.

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doc/introduction/index.rst
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@ -23,6 +23,14 @@ The Zephyr kernel supports multiple architectures, including:
The full list of supported boards based on these architectures can be found :ref:`here <boards>`.
In the context of the Zephyr OS, a :term:`subsystem` refers to a logically distinct
part of the operating system that handles specific functionality or provides
certain services. Subsystems can include components such as networking,
file systems, device driver classes, power management, and communication protocols,
among others. Each subsystem is designed to be modular and can be configured,
customized, and extended to meet the requirements of different embedded
applications.
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