1 .. SPDX-License-Identifier: GFDL-1.1-no-invari
2
3 .. _media-controller-model:
4
5 Media device model
6 ==================
7
8 Discovering a device internal topology, and co
9 is one of the goals of the media controller AP
10 hardware devices and Linux Kernel interfaces a
11 objects on an oriented graph. The object types
12 are:
13
14 - An **entity** is a basic media hardware or
15 It can correspond to a large variety of log
16 physical hardware devices (CMOS sensor for
17 hardware devices (a building block in a Sys
18 processing pipeline), DMA channels or physi
19
20 - An **interface** is a graph representation
21 userspace API interface, like a device node
22 controls one or more entities in the graph.
23
24 - A **pad** is a data connection endpoint thr
25 interact with other entities. Data (not res
26 by an entity flows from the entity's output
27 inputs. Pads should not be confused with ph
28 boundaries.
29
30 - A **data link** is a point-to-point oriente
31 pads, either on the same entity or on diffe
32 from a source pad to a sink pad.
33
34 - An **interface link** is a point-to-point b
35 connection between a Linux Kernel interface
36
37 - An **ancillary link** is a point-to-point co
38 entities form a single logical unit. For exa
39 fact that a particular camera sensor and len
40 physical module, meaning this lens controlle
41 camera sensor.
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