Re: [PATCH] dt-bindings: display: Convert stm32 display bindings to json-schema

[Rob Herring <robh+dt@kernel.org>]

On Wed, Oct 2, 2019 at 10:17 AM Benjamin Gaignard
<benjamin.gaignard@st.com> wrote:
>
> Convert the STM32 display binding to DT schema format using json-schema.
> Split the original bindings in two yaml files:
> - one for display controller (ltdc)
> - one for DSI controller
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
> ---
>  .../devicetree/bindings/display/st,stm32-dsi.yaml  | 130 +++++++++++++++++++
>  .../devicetree/bindings/display/st,stm32-ltdc.txt  | 144 ---------------------
>  .../devicetree/bindings/display/st,stm32-ltdc.yaml |  82 ++++++++++++
>  3 files changed, 212 insertions(+), 144 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/display/st,stm32-dsi.yaml
>  delete mode 100644 Documentation/devicetree/bindings/display/st,stm32-ltdc.txt
>  create mode 100644 Documentation/devicetree/bindings/display/st,stm32-ltdc.yaml
>
> diff --git a/Documentation/devicetree/bindings/display/st,stm32-dsi.yaml b/Documentation/devicetree/bindings/display/st,stm32-dsi.yaml
> new file mode 100644
> index 000000000000..8143cf6f0ce7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/st,stm32-dsi.yaml
> @@ -0,0 +1,130 @@
> +# SPDX-License-Identifier: GPL-2.0

If all the authors are ST, can you relicense to (GPL-2.0-only OR BSD-2-Clause).

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/st,stm32-dsi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: STMicroelectronics STM32 DSI host controller
> +
> +maintainers:
> +  - Philippe Cornu <philippe.cornu@st.com>
> +  - Yannick Fertre <yannick.fertre@st.com>
> +
> +properties:
> +  "#address-cells": true
> +  "#size-cells": true
> +
> +  compatible:
> +    const: st,stm32-dsi
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Module Clock
> +      - description: DSI bus clock
> +      - description: Pixel clock
> +    minItems: 2
> +    maxItems: 3
> +
> +  clock-names:
> +    items:
> +      - const: pclk
> +      - const: ref
> +      - const: px_clk
> +    minItems: 2
> +    maxItems: 3
> +
> +  resets:
> +    maxItems: 1
> +
> +  reset-names:
> +    items:
> +      - const: apb
> +
> +  phy-dsi-supply:
> +    maxItems: 1
> +    description:
> +        Phandle of the regulator that provides the supply voltage.
> +
> +  ports:
> +    type: object
> +    description:
> +        A node containing DSI input & output port nodes with endpoint
> +        definitions as documented in
> +        Documentation/devicetree/bindings/media/video-interfaces.txt
> +        Documentation/devicetree/bindings/graph.txt
> +
> +  port:

This needs to be under 'properties' under 'ports'. And you need to
have 'port@0' and 'port@1' instead.

> +    type: object
> +    description:
> +      "A port node with endpoint definitions as defined in
> +      Documentation/devicetree/bindings/media/video-interfaces.txt.
> +      port@0: DSI input port node, connected to the ltdc rgb output port.
> +      port@1: DSI output port node, connected to a panel or a bridge input port"
> +
> +required:
> +  - "#address-cells"
> +  - "#size-cells"
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - resets
> +  - ports

Add an 'additionalProperties: false' here.

> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/stm32mp1-clks.h>
> +    #include <dt-bindings/reset/stm32mp1-resets.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +    dsi: dsi@5a000000 {
> +        compatible = "st,stm32-dsi";
> +        reg = <0x5a000000 0x800>;
> +        clocks = <&rcc DSI_K>, <&clk_hse>, <&rcc DSI_PX>;
> +        clock-names = "pclk", "ref", "px_clk";
> +        resets = <&rcc DSI_R>;
> +        reset-names = "apb";
> +        phy-dsi-supply = <&reg18>;
> +
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        ports {
> +              #address-cells = <1>;
> +              #size-cells = <0>;
> +
> +              port@0 {
> +                    reg = <0>;
> +                    dsi_in: endpoint {
> +                        remote-endpoint = <&ltdc_ep1_out>;
> +                    };
> +              };
> +
> +              port@1 {
> +                    reg = <1>;
> +                    dsi_out: endpoint {
> +                        remote-endpoint = <&panel_in>;
> +                    };
> +              };
> +        };
> +
> +        panel {

Not documented.

> +              compatible = "orisetech,otm8009a";
> +              reg = <0>;
> +              reset-gpios = <&gpioe 4 GPIO_ACTIVE_LOW>;
> +              power-supply = <&v3v3>;
> +
> +              port {
> +                    panel_in: endpoint {
> +                        remote-endpoint = <&dsi_out>;
> +                    };
> +              };
> +        };
> +    };
> +
> +...
> +
> +

[...]

> diff --git a/Documentation/devicetree/bindings/display/st,stm32-ltdc.yaml b/Documentation/devicetree/bindings/display/st,stm32-ltdc.yaml
> new file mode 100644
> index 000000000000..5d01c83234a3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/st,stm32-ltdc.yaml
> @@ -0,0 +1,82 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/st,stm32-ltdc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: STMicroelectronics STM32 lcd-tft display controller
> +
> +maintainers:
> +  - Philippe Cornu <philippe.cornu@st.com>
> +  - Yannick Fertre <yannick.fertre@st.com>
> +
> +properties:
> +  compatible:
> +    const: st,stm32-ltdc
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    minItems: 2
> +    maxItems: 2
> +
> +  clocks:
> +    items:
> +      - description: Module Clock

Just 'maxItems: 1' is sufficient with a single entry.

> +
> +  clock-names:
> +    items:
> +      - const: lcd
> +
> +  pinctrl-names: true
> +
> +  resets:
> +        maxItems: 1

Inconsistent indenting.

> +
> +  port:
> +    type: object
> +    description:
> +      "Video port for DPI RGB output.
> +      ltdc has one video port with up to 2 endpoints:
> +      - for external dpi rgb panel or bridge, using gpios.
> +      - for internal dpi input of the MIPI DSI host controller.
> +      Note: These 2 endpoints cannot be activated simultaneously.
> +      Please refer to the bindings defined in
> +      Documentation/devicetree/bindings/media/video-interfaces.txt."
> +
> +patternProperties:
> +  "^pinctrl-[0-9]+$": true

No need for this, it gets added automatically.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - resets
> +  - port

Add an 'additionalProperties: false' here.

> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/stm32mp1-clks.h>
> +    #include <dt-bindings/reset/stm32mp1-resets.h>
> +    ltdc: display-controller@40016800 {
> +        compatible = "st,stm32-ltdc";
> +        reg = <0x5a001000 0x400>;
> +        interrupts = <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&rcc LTDC_PX>;
> +        clock-names = "lcd";
> +        resets = <&rcc LTDC_R>;
> +
> +        port {
> +             ltdc_out_dsi: endpoint {
> +                     remote-endpoint = <&dsi_in>;
> +             };
> +        };
> +    };
> +
> +...
> +
> --
> 2.15.0
>

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