Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml

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Linux kernel
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Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml
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.yaml
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Support Tooling And Documentation
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Documentation
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Support Tooling And Documentation: configuration, schema, or hardware description
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Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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# 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

Annotation

Implementation Notes