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diff --git a/Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml b/Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml new file mode 100644 index 000000000..6655a93b1 --- /dev/null +++ b/Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml @@ -0,0 +1,145 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +# Copyright 2019 BayLibre, SAS +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/display/amlogic,meson-vpu.yaml#" +$schema: "http://devicetree.org/meta-schemas/core.yaml#" + +title: Amlogic Meson Display Controller + +maintainers: + - Neil Armstrong <neil.armstrong@linaro.org> + +description: | + The Amlogic Meson Display controller is composed of several components + that are going to be documented below + + DMC|---------------VPU (Video Processing Unit)----------------|------HHI------| + | vd1 _______ _____________ _________________ | | + D |-------| |----| | | | | HDMI PLL | + D | vd2 | VIU | | Video Post | | Video Encoders |<---|-----VCLK | + R |-------| |----| Processing | | | | | + | osd2 | | | |---| Enci ----------|----|-----VDAC------| + R |-------| CSC |----| Scalers | | Encp ----------|----|----HDMI-TX----| + A | osd1 | | | Blenders | | Encl ----------|----|---------------| + M |-------|______|----|____________| |________________| | | + ___|__________________________________________________________|_______________| + + + VIU: Video Input Unit + --------------------- + + The Video Input Unit is in charge of the pixel scanout from the DDR memory. + It fetches the frames addresses, stride and parameters from the "Canvas" memory. + This part is also in charge of the CSC (Colorspace Conversion). + It can handle 2 OSD Planes and 2 Video Planes. + + VPP: Video Post Processing + -------------------------- + + The Video Post Processing is in charge of the scaling and blending of the + various planes into a single pixel stream. + There is a special "pre-blending" used by the video planes with a dedicated + scaler and a "post-blending" to merge with the OSD Planes. + The OSD planes also have a dedicated scaler for one of the OSD. + + VENC: Video Encoders + -------------------- + + The VENC is composed of the multiple pixel encoders + - ENCI : Interlace Video encoder for CVBS and Interlace HDMI + - ENCP : Progressive Video Encoder for HDMI + - ENCL : LCD LVDS Encoder + The VENC Unit gets a Pixel Clocks (VCLK) from a dedicated HDMI PLL and clock + tree and provides the scanout clock to the VPP and VIU. + The ENCI is connected to a single VDAC for Composite Output. + The ENCI and ENCP are connected to an on-chip HDMI Transceiver. + +properties: + compatible: + oneOf: + - items: + - enum: + - amlogic,meson-gxbb-vpu # GXBB (S905) + - amlogic,meson-gxl-vpu # GXL (S905X, S905D) + - amlogic,meson-gxm-vpu # GXM (S912) + - const: amlogic,meson-gx-vpu + - enum: + - amlogic,meson-g12a-vpu # G12A (S905X2, S905Y2, S905D2) + + reg: + maxItems: 2 + + reg-names: + items: + - const: vpu + - const: hhi + + interrupts: + maxItems: 1 + + amlogic,canvas: + description: should point to a canvas provider node + $ref: /schemas/types.yaml#/definitions/phandle + + power-domains: + maxItems: 1 + description: phandle to the associated power domain + + port@0: + $ref: /schemas/graph.yaml#/properties/port + description: + A port node pointing to the CVBS VDAC port node. + + port@1: + $ref: /schemas/graph.yaml#/properties/port + description: + A port node pointing to the HDMI-TX port node. + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + +required: + - compatible + - reg + - interrupts + - port@0 + - port@1 + - "#address-cells" + - "#size-cells" + - amlogic,canvas + +additionalProperties: false + +examples: + - | + vpu: vpu@d0100000 { + compatible = "amlogic,meson-gxbb-vpu", "amlogic,meson-gx-vpu"; + reg = <0xd0100000 0x100000>, <0xc883c000 0x1000>; + reg-names = "vpu", "hhi"; + interrupts = <3>; + #address-cells = <1>; + #size-cells = <0>; + amlogic,canvas = <&canvas>; + + /* CVBS VDAC output port */ + port@0 { + reg = <0>; + + cvbs_vdac_out: endpoint { + remote-endpoint = <&tv_connector_in>; + }; + }; + + /* HDMI TX output port */ + port@1 { + reg = <1>; + + hdmi_tx_out: endpoint { + remote-endpoint = <&hdmi_tx_in>; + }; + }; + }; |