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Message-ID: <5206c520-1263-a5a4-8960-edd41aaf3175@ti.com>
Date:   Mon, 9 Jan 2023 22:14:09 +0530
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Subject: Re: [RFC PATCH 3/4] dt-bindings: panel: Introduce dual-link LVDS
 panel
Content-Language: en-US
To:     Laurent Pinchart <laurent.pinchart@ideasonboard.com>
CC:     Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Tomi Valkeinen <tomba@kernel.org>,
        Jyri Sarha <jyri.sarha@iki.fi>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Thierry Reding <thierry.reding@gmail.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        Maxime Ripard <maxime@cerno.tech>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Guo Ren <guoren@kernel.org>,
        DRI Development List <dri-devel@lists.freedesktop.org>,
        Devicetree List <devicetree@vger.kernel.org>,
        Linux Kernel List <linux-kernel@vger.kernel.org>,
        Linux RISC-V List <linux-riscv@lists.infradead.org>,
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        Linux C-SKY Arch List <linux-csky@vger.kernel.org>,
        Nishanth Menon <nm@ti.com>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Rahul T R <r-ravikumar@ti.com>,
        Devarsh Thakkar <devarsht@ti.com>,
        Jai Luthra <j-luthra@ti.com>,
        Jayesh Choudhary <j-choudhary@ti.com>
References: <20230103064615.5311-1-a-bhatia1@ti.com>
 <20230103064615.5311-4-a-bhatia1@ti.com>
 <Y7ppO8nZFw7ZKdOi@pendragon.ideasonboard.com>
From:   Aradhya Bhatia <a-bhatia1@ti.com>
In-Reply-To: <Y7ppO8nZFw7ZKdOi@pendragon.ideasonboard.com>
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Hi Laurent,

Thank you for reviewing the patches!

On 08-Jan-23 12:26, Laurent Pinchart wrote:
> Hi Aradhya,
> 
> Thank you for the patch.
> 
> On Tue, Jan 03, 2023 at 12:16:14PM +0530, Aradhya Bhatia wrote:
>> Dual-link LVDS interfaces have 2 links, with even pixels traveling on
>> one link, and odd pixels on the other. These panels are also generic in
>> nature, with no documented constraints, much like their single-link
>> counterparts, "panel-lvds".
>>
>> Add a new compatible, "panel-dual-lvds", and a dt-binding document for
>> these panels.
>>
>> Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
>> ---
>>   .../display/panel/panel-dual-lvds.yaml        | 157 ++++++++++++++++++
>>   MAINTAINERS                                   |   1 +
>>   2 files changed, 158 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/display/panel/panel-dual-lvds.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/display/panel/panel-dual-lvds.yaml b/Documentation/devicetree/bindings/display/panel/panel-dual-lvds.yaml
>> new file mode 100644
>> index 000000000000..88a7aa2410be
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/panel/panel-dual-lvds.yaml
>> @@ -0,0 +1,157 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/display/panel/panel-dual-lvds.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Generic Dual-Link LVDS Display Panel
>> +
>> +maintainers:
>> +  - Aradhya Bhatia <a-bhatia1@ti.com>
>> +  - Thierry Reding <thierry.reding@gmail.com>
>> +
>> +description: |
>> +  A dual-LVDS interface is a dual-link connection with the even pixels
>> +  traveling on one link, and the odd pixels traveling on the other.
>> +
>> +allOf:
>> +  - $ref: panel-common.yaml#
>> +  - $ref: /schemas/display/lvds.yaml/#
>> +
>> +properties:
>> +  compatible:
>> +    oneOf:
>> +      - items:
>> +          - enum:
>> +              - lincolntech,lcd185-101ct
>> +              - microtips,13-101hieb0hf0-s
>> +          - const: panel-dual-lvds
>> +      - const: panel-dual-lvds
> 
> A device-specific compatible string should be required,
> "panel-dual-lvds" alone shouldn't be allowed. Otherwise it won't be
> possible to tell different models apart later should this be required.
> 

Understood! Will make the fix in the next revision.

>> +
>> +  ports:
>> +    $ref: /schemas/graph.yaml#/properties/ports
>> +
>> +    properties:
>> +      port@0:
>> +        $ref: /schemas/graph.yaml#/$defs/port-base
>> +        unevaluatedProperties: false
>> +        description: The sink for first set of LVDS pixels.
>> +
>> +        properties:
>> +          dual-lvds-odd-pixels:
>> +            type: boolean
>> +
>> +          dual-lvds-even-pixels:
>> +            type: boolean
>> +
>> +        oneOf:
>> +          - required: [dual-lvds-odd-pixels]
>> +          - required: [dual-lvds-even-pixels]
>> +
>> +      port@1:
>> +        $ref: /schemas/graph.yaml#/$defs/port-base
>> +        unevaluatedProperties: false
>> +        description: The sink for second set of LVDS pixels.
>> +
>> +        properties:
>> +          dual-lvds-even-pixels:
>> +            type: boolean
>> +
>> +          dual-lvds-odd-pixels:
>> +            type: boolean
>> +
>> +        oneOf:
>> +          - required: [dual-lvds-even-pixels]
>> +          - required: [dual-lvds-odd-pixels]
>> +
>> +    allOf:
>> +      - if:
>> +          properties:
>> +            port@0:
>> +              properties:
>> +                dual-lvds-odd-pixels: true
>> +              required:
>> +                - dual-lvds-odd-pixels
>> +        then:
>> +          properties:
>> +            port@1:
>> +              properties:
>> +                dual-lvds-even-pixels: true
>> +                dual-lvds-odd-pixels: false
>> +
>> +      - if:
>> +          properties:
>> +            port@0:
>> +              properties:
>> +                dual-lvds-even-pixels: true
>> +              required:
>> +                - dual-lvds-even-pixels
>> +        then:
>> +          properties:
>> +            port@1:
>> +              properties:
>> +                dual-lvds-odd-pixels: true
>> +                dual-lvds-even-pixels: false
>> +
>> +    required:
>> +      - port@0
>> +      - port@1
>> +
>> +  port: false
>> +
>> +unevaluatedProperties: false
>> +
>> +required:
>> +  - compatible
>> +  - width-mm
>> +  - height-mm
>> +  - data-mapping
>> +  - panel-timing
>> +  - ports
>> +
>> +examples:
>> +  - |+
>> +    panel-dual-lvds {
>> +      compatible = "microtips,13-101hieb0hf0-s", "panel-dual-lvds";
>> +
>> +      width-mm = <217>;
>> +      height-mm = <136>;
>> +
>> +      data-mapping = "vesa-24";
>> +
>> +      panel-timing {
>> +        clock-frequency = <150275000>;
>> +        hactive = <1920>;
>> +        vactive = <1200>;
>> +        hfront-porch = <32>;
>> +        hsync-len = <52>;
>> +        hback-porch = <24>;
>> +        vfront-porch = <24>;
>> +        vsync-len = <8>;
>> +        vback-porch = <3>;
>> +        de-active = <1>;
>> +      };
>> +
>> +      ports {
>> +        #address-cells = <1>;
>> +        #size-cells = <0>;
>> +
>> +        port@0 {
>> +          reg = <0>;
>> +          dual-lvds-odd-pixels;
>> +          lcd_in0: endpoint {
>> +            remote-endpoint = <&oldi_out0>;
>> +          };
>> +        };
>> +
>> +        port@1 {
>> +          reg = <1>;
>> +          dual-lvds-even-pixels;
>> +          lcd_in1: endpoint {
>> +            remote-endpoint = <&oldi_out1>;
>> +          };
>> +        };
>> +      };
>> +    };
>> +
>> +...
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 7f86d02cb427..c13f24293ab1 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -6595,6 +6595,7 @@ T:	git git://anongit.freedesktop.org/drm/drm-misc
>>   S:	Maintained
>>   F:	drivers/gpu/drm/panel/panel-lvds.c
>>   F:	Documentation/devicetree/bindings/display/lvds.yaml
>> +F:	Documentation/devicetree/bindings/display/panel/panel-dual-lvds.yaml
>>   F:	Documentation/devicetree/bindings/display/panel/panel-lvds.yaml
>>   
>>   DRM DRIVER FOR MANTIX MLAF057WE51 PANELS
> 

Regards
Aradhya