linux-kernel - Re: [PATCH 2/3] dt-bindings: display: amlogic,meson-vpu: convert to yaml

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Message-ID: <CAL_JsqLMS2y5ZR4SH6TVwnaTDhnGwk2_C_81DTz9J=ypDdBd4w@mail.gmail.com>
Date:   Mon, 5 Aug 2019 16:19:10 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     devicetree@...r.kernel.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-amlogic@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] dt-bindings: display: amlogic,meson-vpu: convert to yaml

On Mon, Aug 5, 2019 at 7:43 AM Neil Armstrong <narmstrong@...libre.com> wrote:
>
> Now that we have the DT validation in place, let's convert the device tree
> bindings for the Amlogic Display Controller over to YAML schemas.
>
> The original example has a leftover "dmc" memory cell, that has been
> removed in the yaml rewrite.
>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  .../bindings/display/amlogic,meson-vpu.txt    | 121 --------------
>  .../bindings/display/amlogic,meson-vpu.yaml   | 153 ++++++++++++++++++
>  2 files changed, 153 insertions(+), 121 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/display/amlogic,meson-vpu.txt
>  create mode 100644 Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml


> 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 000000000000..9eba13031998
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml
> @@ -0,0 +1,153 @@
> +# 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 <narmstrong@...libre.com>
> +
> +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.
> +
> +  The following table lists for each supported model the port number
> +  corresponding to each VPU output.
> +
> +                  Port 0       Port 1
> +  -----------------------------------------
> +   S905 (GXBB)   CVBS VDAC        HDMI-TX
> +   S905X (GXL)   CVBS VDAC        HDMI-TX
> +   S905D (GXL)   CVBS VDAC        HDMI-TX
> +   S912 (GXM)      CVBS VDAC      HDMI-TX
> +   S905X2 (G12A)       CVBS VDAC          HDMI-TX
> +   S905Y2 (G12A)       CVBS VDAC          HDMI-TX
> +   S905D2 (G12A)       CVBS VDAC          HDMI-TX
> +
> +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
> +
> +  power-domains:
> +    description: phandle to the associated power domain
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/phandle

Common properties don't need a type definition. As this can be an
array, you just need 'maxItems: 1'.

Same comments on patch 1 apply here too.

Rob