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

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Date: Fri, 22 Dec 2023 09:48:38 +0100
From: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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

Hi Krzysztof,


Thanks for your review. I wall send another serie later with those modifications.


Best regards,

Raphaël


On 12/21/23 18:27, Krzysztof Kozlowski wrote:
> 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
>