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Message-ID: <20230130170441.GA2796575-robh@kernel.org>
Date: Mon, 30 Jan 2023 11:04:41 -0600
From: Rob Herring <robh@...nel.org>
To: Aradhya Bhatia <a-bhatia1@...com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Tomi Valkeinen <tomba@...nel.org>,
Jyri Sarha <jyri.sarha@....fi>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Thierry Reding <thierry.reding@...il.com>,
Sam Ravnborg <sam@...nborg.org>,
Maxime Ripard <maxime@...no.tech>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Matthias Brugger <matthias.bgg@...il.com>,
Guo Ren <guoren@...nel.org>,
DRI Development List <dri-devel@...ts.freedesktop.org>,
Devicetree List <devicetree@...r.kernel.org>,
Linux Kernel List <linux-kernel@...r.kernel.org>,
Linux RISC-V List <linux-riscv@...ts.infradead.org>,
Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
Linux Mediatek List <linux-mediatek@...ts.infradead.org>,
Linux C-SKY Arch List <linux-csky@...r.kernel.org>,
Nishanth Menon <nm@...com>,
Vignesh Raghavendra <vigneshr@...com>,
Rahul T R <r-ravikumar@...com>,
Devarsh Thakkar <devarsht@...com>,
Jai Luthra <j-luthra@...com>,
Jayesh Choudhary <j-choudhary@...com>
Subject: Re: [PATCH v2 3/4] dt-bindings: panel: Introduce dual-link LVDS panel
On Tue, Jan 24, 2023 at 03:42:37PM +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@...com>
> ---
> .../display/panel/panel-dual-lvds.yaml | 149 ++++++++++++++++++
> MAINTAINERS | 1 +
> 2 files changed, 150 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..e2ce1768e9a3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/panel-dual-lvds.yaml
> @@ -0,0 +1,149 @@
> +# 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@...com>
> + - Thierry Reding <thierry.reding@...il.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:
> + items:
> + - enum:
> + - lincolntech,lcd185-101ct
> + - microtips,mf-101hiebcaf0
> + - const: panel-dual-lvds
Why do we need a new compatible? You have ports and properties to see if
the panel is dual link.
We already have dual link LVDS supported in advantech,idk-2121wr.yaml
which says is compatible with 'panel-lvds', so that decision has already
been made. The hint was you added the compatible match to the driver
with 0 other changes needed.
That schema is missing type definitions and constraints for
dual-lvds-odd-pixels/dual-lvds-even-pixels so there does need to be some
changes to add those.
> +
> + 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:
> + required:
> + - dual-lvds-odd-pixels
> + then:
> + properties:
> + port@1:
> + properties:
> + dual-lvds-odd-pixels: false
> +
> + - if:
> + properties:
> + port@0:
> + required:
> + - dual-lvds-even-pixels
> + then:
> + properties:
> + port@1:
> + properties:
> + 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 {
> + compatible = "microtips,mf-101hiebcaf0", "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 5e18388b4579..6025bb024586 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -6461,6 +6461,7 @@ 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
> --
> 2.39.0
>
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