linux-kernel - Re: [PATCH v2 1/2] dt-bindings: display: imx: Describe drm binding for fsl,imx-lcdc

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Message-ID: <0f3e755f-954a-9722-6898-181170deb2c3@linaro.org>
Date:   Fri, 16 Dec 2022 11:41:30 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>
Cc:     Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: display: imx: Describe drm binding
 for fsl,imx-lcdc

On 14/12/2022 12:59, Uwe Kleine-König wrote:
> Modify the existing (fb-like) binding to support the drm-like binding in
> parallel.

Aren't you now adding two compatibles to the same hardware, just for two
Linux drivers? One hardware should have one compatible, regardless of
Linux display implementation.

> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> ---
>  .../bindings/display/imx/fsl,imx-lcdc.yaml    | 45 ++++++++++++++++++-
>  1 file changed, 44 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/imx/fsl,imx-lcdc.yaml b/Documentation/devicetree/bindings/display/imx/fsl,imx-lcdc.yaml
> index 35a8fff036ca..2a8225b10890 100644
> --- a/Documentation/devicetree/bindings/display/imx/fsl,imx-lcdc.yaml
> +++ b/Documentation/devicetree/bindings/display/imx/fsl,imx-lcdc.yaml
> @@ -21,6 +21,9 @@ properties:
>                - fsl,imx25-fb
>                - fsl,imx27-fb
>            - const: fsl,imx21-fb
> +      - items:
> +          - const: fsl,imx25-lcdc
> +          - const: fsl,imx21-lcdc
>  
>    clocks:
>      maxItems: 3
> @@ -31,6 +34,9 @@ properties:
>        - const: ahb
>        - const: per
>  
> +  port:
> +    $ref: /schemas/graph.yaml#/properties/port
> +
>    display:
>      $ref: /schemas/types.yaml#/definitions/phandle
>  
> @@ -59,17 +65,54 @@ properties:
>      description:
>        LCDC Sharp Configuration Register value.
>  
> +if:

Put it under allOf. It grows pretty often so this would avoid future
re-indents.

> +  properties:
> +    compatible:
> +      contains:
> +        enum:
> +          - fsl,imx1-lcdc
> +          - fsl,imx21-lcdc
> +then:
> +  properties:
> +    display: false
> +    fsl,dmacr: false
> +    fsl,lpccr: false
> +    fsl,lscr1: false
> +
> +  required:
> +    - port
> +
> +else:
> +  properties:
> +    port: false
> +
> +  required:
> +    - display
> +
>  required:
>    - compatible
>    - clocks
>    - clock-names
> -  - display
>    - interrupts
>    - reg
>  
>  additionalProperties: false
>  
>  examples:
> +  - |
> +    lcdc@...bc000 {
> +        compatible = "fsl,imx25-lcdc", "fsl,imx21-lcdc";
> +        reg = <0x53fbc000 0x4000>;
> +        interrupts = <39>;
> +        clocks = <&clks 103>, <&clks 66>, <&clks 49>;
> +        clock-names = "ipg", "ahb", "per";
> +
> +        port {
> +            parallel_out: endpoint {
> +              remote-endpoint = <&panel_in>;
> +            };
> +        };
> +    };
>    - |
>      imxfb: fb@...21000 {
>          compatible = "fsl,imx21-fb";

Best regards,
Krzysztof