xref: /linux/Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml (revision ae22a94997b8a03dcb3c922857c203246711f9d4) 
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2# Copyright 2019 BayLibre, SAS
3%YAML 1.2
4---
5$id: http://devicetree.org/schemas/display/amlogic,meson-vpu.yaml#
6$schema: http://devicetree.org/meta-schemas/core.yaml#
7
8title: Amlogic Meson Display Controller
9
10maintainers:
11  - Neil Armstrong <neil.armstrong@linaro.org>
12
13description: |
14  The Amlogic Meson Display controller is composed of several components
15  that are going to be documented below
16
17  DMC|---------------VPU (Video Processing Unit)----------------|------HHI------|
18     | vd1   _______     _____________    _________________     |               |
19  D  |-------|      |----|            |   |                |    |   HDMI PLL    |
20  D  | vd2   | VIU  |    | Video Post |   | Video Encoders |<---|-----VCLK      |
21  R  |-------|      |----| Processing |   |                |    |               |
22     | osd2  |      |    |            |---| Enci ----------|----|-----VDAC------|
23  R  |-------| CSC  |----| Scalers    |   | Encp ----------|----|----HDMI-TX----|
24  A  | osd1  |      |    | Blenders   |   | Encl ----------|----|---------------|
25  M  |-------|______|----|____________|   |________________|    |               |
26  ___|__________________________________________________________|_______________|
27
28
29  VIU: Video Input Unit
30  ---------------------
31
32  The Video Input Unit is in charge of the pixel scanout from the DDR memory.
33  It fetches the frames addresses, stride and parameters from the "Canvas" memory.
34  This part is also in charge of the CSC (Colorspace Conversion).
35  It can handle 2 OSD Planes and 2 Video Planes.
36
37  VPP: Video Post Processing
38  --------------------------
39
40  The Video Post Processing is in charge of the scaling and blending of the
41  various planes into a single pixel stream.
42  There is a special "pre-blending" used by the video planes with a dedicated
43  scaler and a "post-blending" to merge with the OSD Planes.
44  The OSD planes also have a dedicated scaler for one of the OSD.
45
46  VENC: Video Encoders
47  --------------------
48
49  The VENC is composed of the multiple pixel encoders
50   - ENCI : Interlace Video encoder for CVBS and Interlace HDMI
51   - ENCP : Progressive Video Encoder for HDMI
52   - ENCL : LCD LVDS Encoder
53  The VENC Unit gets a Pixel Clocks (VCLK) from a dedicated HDMI PLL and clock
54  tree and provides the scanout clock to the VPP and VIU.
55  The ENCI is connected to a single VDAC for Composite Output.
56  The ENCI and ENCP are connected to an on-chip HDMI Transceiver.
57
58properties:
59  compatible:
60    oneOf:
61      - items:
62          - enum:
63              - amlogic,meson-gxbb-vpu # GXBB (S905)
64              - amlogic,meson-gxl-vpu # GXL (S905X, S905D)
65              - amlogic,meson-gxm-vpu # GXM (S912)
66          - const: amlogic,meson-gx-vpu
67      - enum:
68          - amlogic,meson-g12a-vpu # G12A (S905X2, S905Y2, S905D2)
69
70  reg:
71    maxItems: 2
72
73  reg-names:
74    items:
75      - const: vpu
76      - const: hhi
77
78  interrupts:
79    maxItems: 1
80
81  amlogic,canvas:
82    description: should point to a canvas provider node
83    $ref: /schemas/types.yaml#/definitions/phandle
84
85  power-domains:
86    maxItems: 1
87    description: phandle to the associated power domain
88
89  port@0:
90    $ref: /schemas/graph.yaml#/properties/port
91    description:
92      A port node pointing to the CVBS VDAC port node.
93
94  port@1:
95    $ref: /schemas/graph.yaml#/properties/port
96    description:
97      A port node pointing to the HDMI-TX port node.
98
99  port@2:
100    $ref: /schemas/graph.yaml#/properties/port
101    description:
102      A port node pointing to the DPI port node (e.g. DSI or LVDS transceiver).
103
104  "#address-cells":
105    const: 1
106
107  "#size-cells":
108    const: 0
109
110required:
111  - compatible
112  - reg
113  - interrupts
114  - port@0
115  - port@1
116  - "#address-cells"
117  - "#size-cells"
118  - amlogic,canvas
119
120additionalProperties: false
121
122examples:
123  - |
124    vpu: vpu@d0100000 {
125        compatible = "amlogic,meson-gxbb-vpu", "amlogic,meson-gx-vpu";
126        reg = <0xd0100000 0x100000>, <0xc883c000 0x1000>;
127        reg-names = "vpu", "hhi";
128        interrupts = <3>;
129        #address-cells = <1>;
130        #size-cells = <0>;
131        amlogic,canvas = <&canvas>;
132
133        /* CVBS VDAC output port */
134        port@0 {
135            reg = <0>;
136
137            cvbs_vdac_out: endpoint {
138                remote-endpoint = <&tv_connector_in>;
139            };
140        };
141
142        /* HDMI TX output port */
143        port@1 {
144            reg = <1>;
145
146            hdmi_tx_out: endpoint {
147                remote-endpoint = <&hdmi_tx_in>;
148            };
149        };
150    };
151