xref: /linux/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml (revision 24bce201d79807b668bf9d9e0aca801c5c0d5f78) 
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2# Copyright 2019 BayLibre, SAS
3%YAML 1.2
4---
5$id: "http://devicetree.org/schemas/display/amlogic,meson-dw-hdmi.yaml#"
6$schema: "http://devicetree.org/meta-schemas/core.yaml#"
7
8title: Amlogic specific extensions to the Synopsys Designware HDMI Controller
9
10maintainers:
11  - Neil Armstrong <narmstrong@baylibre.com>
12
13allOf:
14  - $ref: /schemas/sound/name-prefix.yaml#
15
16description: |
17  The Amlogic Meson Synopsys Designware Integration is composed of
18  - A Synopsys DesignWare HDMI Controller IP
19  - A TOP control block controlling the Clocks and PHY
20  - A custom HDMI PHY in order to convert video to TMDS signal
21   ___________________________________
22  |            HDMI TOP               |<= HPD
23  |___________________________________|
24  |                  |                |
25  |  Synopsys HDMI   |   HDMI PHY     |=> TMDS
26  |    Controller    |________________|
27  |___________________________________|<=> DDC
28
29  The HDMI TOP block only supports HPD sensing.
30  The Synopsys HDMI Controller interrupt is routed through the
31  TOP Block interrupt.
32  Communication to the TOP Block and the Synopsys HDMI Controller is done
33  via a pair of dedicated addr+read/write registers.
34  The HDMI PHY is configured by registers in the HHI register block.
35
36  Pixel data arrives in "4:4:4" format from the VENC block and the VPU HDMI mux
37  selects either the ENCI encoder for the 576i or 480i formats or the ENCP
38  encoder for all the other formats including interlaced HD formats.
39
40  The VENC uses a DVI encoder on top of the ENCI or ENCP encoders to generate
41  DVI timings for the HDMI controller.
42
43  Amlogic Meson GXBB, GXL and GXM SoCs families embeds the Synopsys DesignWare
44  HDMI TX IP version 2.01a with HDCP and I2C & S/PDIF
45  audio source interfaces.
46
47properties:
48  compatible:
49    oneOf:
50      - items:
51          - enum:
52              - amlogic,meson-gxbb-dw-hdmi # GXBB (S905)
53              - amlogic,meson-gxl-dw-hdmi # GXL (S905X, S905D)
54              - amlogic,meson-gxm-dw-hdmi # GXM (S912)
55          - const: amlogic,meson-gx-dw-hdmi
56      - enum:
57          - amlogic,meson-g12a-dw-hdmi # G12A (S905X2, S905Y2, S905D2)
58
59  reg:
60    maxItems: 1
61
62  interrupts:
63    maxItems: 1
64
65  clocks:
66    minItems: 3
67
68  clock-names:
69    items:
70      - const: isfr
71      - const: iahb
72      - const: venci
73
74  resets:
75    minItems: 3
76
77  reset-names:
78    items:
79      - const: hdmitx_apb
80      - const: hdmitx
81      - const: hdmitx_phy
82
83  hdmi-supply:
84    description: phandle to an external 5V regulator to power the HDMI logic
85
86  port@0:
87    $ref: /schemas/graph.yaml#/properties/port
88    description:
89      A port node pointing to the VENC Input port node.
90
91  port@1:
92    $ref: /schemas/graph.yaml#/properties/port
93    description:
94      A port node pointing to the TMDS Output port node.
95
96  "#address-cells":
97    const: 1
98
99  "#size-cells":
100    const: 0
101
102  "#sound-dai-cells":
103    const: 0
104
105  sound-name-prefix: true
106
107required:
108  - compatible
109  - reg
110  - interrupts
111  - clocks
112  - clock-names
113  - resets
114  - reset-names
115  - port@0
116  - port@1
117  - "#address-cells"
118  - "#size-cells"
119
120additionalProperties: false
121
122examples:
123  - |
124    hdmi_tx: hdmi-tx@c883a000 {
125        compatible = "amlogic,meson-gxbb-dw-hdmi", "amlogic,meson-gx-dw-hdmi";
126        reg = <0xc883a000 0x1c>;
127        interrupts = <57>;
128        resets = <&reset_apb>, <&reset_hdmitx>, <&reset_hdmitx_phy>;
129        reset-names = "hdmitx_apb", "hdmitx", "hdmitx_phy";
130        clocks = <&clk_isfr>, <&clk_iahb>, <&clk_venci>;
131        clock-names = "isfr", "iahb", "venci";
132        #address-cells = <1>;
133        #size-cells = <0>;
134
135        /* VPU VENC Input */
136        hdmi_tx_venc_port: port@0 {
137            reg = <0>;
138
139            hdmi_tx_in: endpoint {
140                remote-endpoint = <&hdmi_tx_out>;
141            };
142        };
143
144        /* TMDS Output */
145        hdmi_tx_tmds_port: port@1 {
146             reg = <1>;
147
148             hdmi_tx_tmds_out: endpoint {
149                 remote-endpoint = <&hdmi_connector_in>;
150             };
151        };
152    };
153