[PATCH] media: add glossary.rst with a glossary of terms used at V4L2 spec

[Mauro Carvalho Chehab]

Add a glossary of terms for V4L2, as several concepts are complex
enough to cause misunderstandings.

Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
---
 Documentation/media/uapi/v4l/glossary.rst | 150 ++++++++++++++++++++++++++++++
 Documentation/media/uapi/v4l/v4l2.rst     |   1 +
 2 files changed, 151 insertions(+)
 create mode 100644 Documentation/media/uapi/v4l/glossary.rst

diff --git a/Documentation/media/uapi/v4l/glossary.rst b/Documentation/media/uapi/v4l/glossary.rst
new file mode 100644
index 000000000000..08980e9cb98e
--- /dev/null
+++ b/Documentation/media/uapi/v4l/glossary.rst
@@ -0,0 +1,150 @@
+========
+Glossary
+========
+
+.. note::
+
+   This goal of section is to standardize the terms used within the V4L2
+   documentation. It is written incrementally as they are standardized in
+   the V4L2 documentation. So, it is a Work In Progress.
+
+.. Please keep the glossary entries in alphabetical order
+
+.. glossary::
+
+    Bridge driver
+	A driver that provides a bridge between the CPU's bus to the
+	data and control buses of a media hardware. Often, the
+	bridge driver is the same as V4L2 main driver.
+
+    Chip:
+	See: Integrated circuit.
+
+    Device Node
+	A character device node in the file system used to control and/or
+	do input/output data transfers from/to a Kernel driver.
+
+    Digital Signal Processor - DSP
+	A specialized microprocessor, with its architecture optimized for
+	the operational requirements of digital signal processing.
+
+    Driver
+	The part of the Linux Kernel that implements support
+	for a hardware component.
+
+    Field-programmable Gate Array - FPGA
+	A field-programmable gate array (FPGA) is an integrated circuit
+	designed to be configured by a customer or a designer after
+	manufacturing.
+
+	See https://en.wikipedia.org/wiki/Field-programmable_gate_array.
+
+    Hardware component
+	A subset of the media hardware. For example an IÂC or SPI device,
+	or an IP block inside an SoC or FPGA.
+
+    Image Signal Processor - ISP
+	A specialised processor that implements a set of algorithms for
+	processing image data. ISPs may implement algorithms for lens
+	shading correction, demosaic, scaling and pixel format conversion
+	as well as produce statistics for the use of the control
+	algorithms (e.g. automatic exposure, white balance and focus).
+
+	ISP drivers often contain a receiver for image data from external
+	sources such as sensors and act as V4L2 main driver.
+
+    Inter-Integrated Circuit - IÂC
+	A  multi-master, multi-slave, packet switched, single-ended,
+	serial computer bus. Most V4L2 sub-devices are controlled
+	via this bus.
+
+	See http://www.nxp.com/docs/en/user-guide/UM10204.pdf.
+
+    Integrated circuit - IC
+	A set of electronic circuits on one small flat piece of
+	semiconductor material, normally silicon.
+
+	Also known as chip.
+
+    Intellectual property core - IP core
+	In electronic design a semiconductor intellectual property core,
+	is a reusable unit of logic, cell, or integrated circuit layout
+	design that is the intellectual property of one party.
+	IP cores may be licensed to another party or can be owned
+	and used by a single party alone.
+
+	See https://en.wikipedia.org/wiki/Semiconductor_intellectual_property_core).
+
+    IP block
+	See: IP core.
+
+    Media Controller
+	An API designed to expose and control the relationships of the Media
+	Harware to applications.
+
+	See :ref:`media_controller`.
+
+    Media Controller centric - MC-centric
+	V4L2 hardware that requires a Media controller.
+
+	See :ref:`v4l2_hardware_control`.
+
+    Media hardware
+	A group of hardware components that together form the
+	functional media hardware. For instance the SoC ISP IP
+	cores and external camera sensors together form the
+	camera media hardware.
+
+    Media hardware control
+	Type of control for a media hardware supported by V4L2 drivers.
+
+	See :ref:`v4l2_hardware_control`.
+
+    Microprocessor
+	An electronic circuitry that carries out the instructions
+	of a computer program by performing the basic arithmetic, logical,
+	control and input/output (I/O) operations specified by the
+	instructions on a single integrated circuit.
+
+    SMBus
+	A subset of IÂC, with defines a stricter usage of the bus.
+
+    Serial Peripheral Interface Bus - SPI
+	Synchronous serial communication interface specification used for
+	short distance communication, primarily in embedded systems.
+
+    System on a Chip - SoC
+	An integrated circuit that integrates all components of a computer
+	or other electronic systems.
+
+    V4L2 device node
+	A device node that is associated to a V4L2 main driver,
+	as specified in :ref:`v4l2_device_naming`.
+
+    V4L2 hardware
+	Hardware that is controlled by a V4L2 main driver or a V4L2
+	sub-device driver. V4L2 hardware is a subset of the
+	Media hardware. Often the two are the same, but Media hardware
+	can also contain other non-V4L2 hardware such as DVB hardware.
+
+    V4L2 main driver
+	The V4L2 device driver that implements the main logic to talk with
+	the V4L2 hardware.
+
+	Also known as bridge driver.
+
+	See :ref:`v4l2_hardware_control`.
+
+    V4L2 sub-device
+	See: :ref:`V4L2 sub-device driver`
+
+    V4L2 sub-device driver
+	A driver for a media component whose bus(es) connects it
+	to the hardware controlled via the V4L2 main driver.
+
+	See :ref:`subdev`.
+
+    Video device node centric - Vdevnode-centric
+	V4L2 hardware that is controlled via V4L2 device nodes.
+
+	See :ref:`v4l2_hardware_control`.
diff --git a/Documentation/media/uapi/v4l/v4l2.rst b/Documentation/media/uapi/v4l/v4l2.rst
index 2128717299b3..698c060939f0 100644
--- a/Documentation/media/uapi/v4l/v4l2.rst
+++ b/Documentation/media/uapi/v4l/v4l2.rst
@@ -32,6 +32,7 @@ This part describes the Video for Linux API version 2 (V4L2 API) specification.
     videodev
     capture-example
     v4l2grab-example
+    glossary
     biblio
 
 
-- 
2.13.6