linux-kernel - Re: [PATCH v1 2/8] dt-bindings: display: add dt-bindings for STM32 LVDS device

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Message-ID: <fcd68fbe-c543-4b6d-9b7f-bcea09918fb9@linaro.org>
Date: Thu, 21 Dec 2023 18:27:12 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Yannick Fertre <yannick.fertre@...s.st.com>,
 Philippe Cornu <philippe.cornu@...s.st.com>,
 Philipp Zabel <p.zabel@...gutronix.de>,
 Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
 Thierry Reding <thierry.reding@...il.com>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 2/8] dt-bindings: display: add dt-bindings for STM32
 LVDS device

On 21/12/2023 13:28, Raphael Gallais-Pou wrote:
> Add dt-binding file for "st,stm32-lvds" compatible.
> 

A nit, subject: drop second/last, redundant "dt-bindings for". The
"dt-bindings" prefix is already stating that these are bindings.

> Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
> ---
>  .../bindings/display/st,stm32-lvds.yaml       | 114 ++++++++++++++++++
>  1 file changed, 114 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/st,stm32-lvds.yaml
> 

...

> +properties:
> +  "#clock-cells":
> +    const: 0
> +
> +  compatible:
> +    const: st,stm32-lvds

Please put compatible as first.

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: APB peripheral clock
> +      - description: Reference clock for the internal PLL
> +
> +  clock-names:
> +    items:
> +      - const: pclk
> +      - const: ref
> +
> +  resets:
> +    maxItems: 1
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: |
> +          LVDS input port node, connected to the LTDC RGB output port.
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: |
> +          LVDS output port node, connected to a panel or bridge input port.

Ports are not required? I would assume it won't work without input and
output.

> +
> +required:
> +  - "#clock-cells"
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - resets
> +  - ports
> +
> +unevaluatedProperties: false

additionalProperties instead... or did I miss some $ref anywhere?

> +
> +examples:
> +  - |
> +    #include <dt-bindings/bus/stm32mp25_sys_bus.h>
> +    #include <dt-bindings/clock/stm32mp25-clks.h>
> +    #include <dt-bindings/reset/stm32mp25-resets.h>
> +
> +    lvds: lvds@...60000 {
> +        #clock-cells = <0>;
> +        compatible = "st,stm32-lvds";

compatible is always the first property.

> +        reg = <0x48060000 0x2000>;

put clock-cells here

> +        clocks = <&rcc CK_BUS_LVDS>, <&rcc CK_KER_LVDSPHY>;
> +        clock-names = "pclk", "ref";
> +        resets = <&rcc LVDS_R>;

Best regards,
Krzysztof