On 29/08/17 15:17, Mauro Carvalho Chehab wrote: > Add a glossary of terms for V4L2, as several concepts are complex > enough to cause misunderstandings. > > Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com> > --- > 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..afafe1bc1894 > --- /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 > + 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. > + > + Hardware component > + A subset of the media hardware. For example an I²C or SPI device, > + or an IP block inside an SoC or FPGA. > + > + Hardware peripheral
As I mentioned before, I really don't like the term 'peripheral'. I am fine with "Media hardware". A peripheral to me are keyboards, mice, webcams, printers, etc. Not an SoC with a CSI sensor on the board. > + A group of hardware components that together make a larger > + user-facing functional peripheral. For instance the SoC ISP IP > + cores and external camera sensors together make a > + camera hardware peripheral. > + > + Also known as peripheral. > + > + Hardware peripheral control So this would become "Media hardware control" > + Type of control for a hardware peripheral supported by V4L2 drivers. > + > + See :ref:`v4l2_hardware_control`. > + > + 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 Typo: Intellectual > + 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). > + > + 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). > + > + Peripheral > + The same as hardware peripheral. I'd drop this. > + > + Media Controller > + An API designed to expose and control devices and sub-devices > + relationships to applications. > + > + See :ref:`media_controller`. > + > + MC-centric > + V4L2 hardware that requires a Media controller. > + > + 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 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. Do we really need this? If we do, then this description needs to be fixed: you only say what it isn't controller by, not what actually does control it. > + > + V4L2 device node > + A device node that is associated to a V4L2 main driver, > + as specified in :ref:`v4l2_device_naming`. > + > + V4L2 hardware > + A hardware used to on a media device supported by the V4L2 > + subsystem. > + > + V4L2 hardware control > + The type of hardware control that a device supports. > + > + See :ref:`v4l2_hardware_control`. ??? This is the same as "Hardware peripheral control". I'd stick to just one term (i.e. "Media hardware control" as I proposed). > + > + 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 > + Part of the media hardware that it is implemented by a device it is -> is I don't think this is right. A V4L2 sub-device not hardware. It represents a media hardware component and is implemented in a V4L2 sub-device driver. > + driver that is not part of the main V4L2 driver. > + > + See :ref:`subdev`. > + > + Vdev-centric I strongly prefer to call this vdevnode-centric. 'vdev' is too vague and it only works for us because we use 'vdev' in our code as the name for a video device node structure. End-users has no knowledge of that. I agree with the text in patches 2-7, except for the terminology. If others agree, then once it is changed in a v7 patch series I'll review again for consistent usage of the terminology. Regards, Hans > + V4L2 hardware that it 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 f52a11c949d3..1ee4b86d18e1 100644 > --- a/Documentation/media/uapi/v4l/v4l2.rst > +++ b/Documentation/media/uapi/v4l/v4l2.rst > @@ -31,6 +31,7 @@ This part describes the Video for Linux API version 2 (V4L2 > API) specification. > videodev > capture-example > v4l2grab-example > + glossary > biblio > > >
