| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 | |
| 8 | title: Amlogic Meson Display Controller |
| 9 | |
| 10 | maintainers: |
| 11 | - Neil Armstrong <neil.armstrong@linaro.org> |
| 12 | |
| 13 | description: | |
| 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 | |
| 58 | properties: |
| 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 | |
| 110 | required: |
| 111 | - compatible |
| 112 | - reg |
| 113 | - interrupts |
| 114 | - port@0 |
| 115 | - port@1 |
| 116 | - "#address-cells" |
| 117 | - "#size-cells" |
| 118 | - amlogic,canvas |
| 119 | |
| 120 | additionalProperties: false |
| 121 | |
| 122 | examples: |
| 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 | }; |