Hi Mauro, Thanks for the set! A few quick comments below, mainly additions and language. On Tue, Sep 25, 2018 at 09:06:51AM -0300, Mauro Carvalho Chehab wrote: > From: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx> > > Add a glossary of terms for V4L2, as several concepts are complex > enough to cause misunderstandings. > > Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx> > --- > Documentation/media/uapi/v4l/glossary.rst | 108 ++++++++++++++++++++++ > Documentation/media/uapi/v4l/v4l2.rst | 1 + > 2 files changed, 109 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..3dff6430d79f > --- /dev/null > +++ b/Documentation/media/uapi/v4l/glossary.rst > @@ -0,0 +1,108 @@ > +======== > +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 > + The same as V4L2 main driver. > + > + Device Node > + A character device node in the file system used to control and do > + input/output data transfers from/to a Kernel driver. > + > + Digital Signal Processor - DSP > + A specialized microprocessor, with its architecture optimized for > + the operational needs 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. > + > + Inter-Integrated Circuit - I²C > + A multi-master, multi-slave, packet switched, single-ended, > + serial computer bus used to control V4L2 sub-devices. > + > + 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. > + > + IP block > + The same as IP core. > + > + Intelectual 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. "Intellectual property" is not really the main point here, but I don't object. You could use "hardware block" as well; I think that could be more commonly used. Either way, we should be fine with just one of "IP block" and "IP core". > + > + See https://en.wikipedia.org/wiki/Semiconductor_intellectual_property_core). > + > + 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). > + > + Media Controller > + An API designed to expose and control devices and sub-devices > + relationships to applications. > + > + See :ref:`media_controller`. Could you also add: Media device A device node that implements the Media controller interface. Used to access the Media device complex besides the V4L2 and V4L2 sub-device nodes. Media hardware complex A collection of hardware components that together constitute an complex that can be seen as a single device. An example of this is a raw Bayer camera and an ISP that processes the images from the camera before writing them to system memory. > + > + MC-centric > + V4L2 hardware that requires a Media controller. How about: Hardware the image data pipeline configuration of which requires the use of Media controller and V4L2 sub-device interfaces. > + > + 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 I²C, 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. > + > + Sub-device hardware components > + Hardware components that aren't controlled by the > + V4L2 main driver. > + > + V4L2 main driver > + The V4L2 device driver that implements the main logic to talk with > + the V4L2 hardware. How about: V4L2 hardware -> hardware There's no "V4L2 hardware" as such. > + > + Also known as bridge driver. > + > + V4L2 sub-device > + Part of the media hardware that it is implemented by a device > + driver that is not part of the main V4L2 driver. I would agree with the definition if this were the kernel documentation. Towards user space the API matters. How about: Control interface for V4L2 sub-devices that are a part of the Media device. > + > + See :ref:`subdev`. > diff --git a/Documentation/media/uapi/v4l/v4l2.rst b/Documentation/media/uapi/v4l/v4l2.rst > index b89e5621ae69..74b397a8d033 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 > > -- Kind regards, Sakari Ailus e-mail: sakari.ailus@xxxxxx
