1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/display/allwinner,sun4i-a10-display-engine.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Allwinner A10 Display Engine Pipeline Device Tree Bindings
maintainers:
- Chen-Yu Tsai <wens@csie.org>
- Maxime Ripard <mripard@kernel.org>
description: |
The display engine pipeline (and its entry point, since it can be
either directly the backend or the frontend) is represented as an
extra node.
The Allwinner A10 Display pipeline is composed of several components
that are going to be documented below:
For all connections between components up to the TCONs in the
display pipeline, when there are multiple components of the same
type at the same depth, the local endpoint ID must be the same as
the remote component's index. For example, if the remote endpoint is
Frontend 1, then the local endpoint ID must be 1.
Frontend 0 [0] ------- [0] Backend 0 [0] ------- [0] TCON 0
[1] -- -- [1] [1] -- -- [1]
\ / \ /
X X
/ \ / \
[0] -- -- [0] [0] -- -- [0]
Frontend 1 [1] ------- [1] Backend 1 [1] ------- [1] TCON 1
For a two pipeline system such as the one depicted above, the lines
represent the connections between the components, while the numbers
within the square brackets corresponds to the ID of the local endpoint.
The same rule also applies to DE 2.0 mixer-TCON connections:
Mixer 0 [0] ----------- [0] TCON 0
[1] ---- ---- [1]
\ /
X
/ \
[0] ---- ---- [0]
Mixer 1 [1] ----------- [1] TCON 1
properties:
compatible:
enum:
- allwinner,sun4i-a10-display-engine
- allwinner,sun5i-a10s-display-engine
- allwinner,sun5i-a13-display-engine
- allwinner,sun6i-a31-display-engine
- allwinner,sun6i-a31s-display-engine
- allwinner,sun7i-a20-display-engine
- allwinner,sun8i-a23-display-engine
- allwinner,sun8i-a33-display-engine
- allwinner,sun8i-a83t-display-engine
- allwinner,sun8i-h3-display-engine
- allwinner,sun8i-r40-display-engine
- allwinner,sun8i-v3s-display-engine
- allwinner,sun9i-a80-display-engine
- allwinner,sun50i-a64-display-engine
- allwinner,sun50i-h6-display-engine
allwinner,pipelines:
$ref: /schemas/types.yaml#/definitions/phandle-array
minItems: 1
maxItems: 2
description: |
Available display engine frontends (DE 1.0) or mixers (DE
2.0/3.0) available.
required:
- compatible
- allwinner,pipelines
additionalProperties: false
if:
properties:
compatible:
contains:
enum:
- allwinner,sun4i-a10-display-engine
- allwinner,sun6i-a31-display-engine
- allwinner,sun6i-a31s-display-engine
- allwinner,sun7i-a20-display-engine
- allwinner,sun8i-a83t-display-engine
- allwinner,sun8i-r40-display-engine
- allwinner,sun9i-a80-display-engine
- allwinner,sun50i-a64-display-engine
then:
properties:
allwinner,pipelines:
minItems: 2
else:
properties:
allwinner,pipelines:
maxItems: 1
examples:
- |
de: display-engine {
compatible = "allwinner,sun4i-a10-display-engine";
allwinner,pipelines = <&fe0>, <&fe1>;
};
...
|
