linux-kernel - Re: [PATCH v2 1/7] dt-bindings: display: panel: properly document LG LD070WX3 panel

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Message-ID: <20251008-safely-reach-9274474a2ec8@spud>
Date: Wed, 8 Oct 2025 22:11:24 +0100
From: Conor Dooley <conor@...nel.org>
To: Svyatoslav Ryhel <clamor95@...il.com>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
	Jessica Zhang <quic_jesszhan@...cinc.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Douglas Anderson <dianders@...omium.org>,
	Sam Ravnborg <sam@...nborg.org>, dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH v2 1/7] dt-bindings: display: panel: properly document LG
 LD070WX3 panel

On Wed, Oct 08, 2025 at 11:27:53AM +0300, Svyatoslav Ryhel wrote:
> LG LD070WX3-SL01 was mistakenly documented as a simple DSI panel, which it
> clearly is not. Address this by adding the proper schema for this panel.
> 
> There is only one user of this panel binding in the mainline Linux kernel,
> which is the Nvidia tablet Tegra Note 7. Its panel is broken anyway since
> it cannot initialize properly if the bootloader does not leave a
> pre-initialized panel. It also cannot suspend or re-initialize properly,
> since no DSI configuration is set and it has a loose regulator which
> relies on an always-on property rather than being hooked to the panel
> where it belongs.

I think this is a reasonable justification. For my own enlightenment,
what happens if a new kernel uses the old simple-panel devicetree?

> Tegra Note 7 device tree is adjusted as a part of this series.
> 
> Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
> ---
>  .../bindings/display/panel/lg,ld070wx3.yaml   | 60 +++++++++++++++++++
>  .../display/panel/panel-simple-dsi.yaml       |  2 -
>  2 files changed, 60 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/lg,ld070wx3.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/lg,ld070wx3.yaml b/Documentation/devicetree/bindings/display/panel/lg,ld070wx3.yaml
> new file mode 100644
> index 000000000000..0a82cf311452
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/lg,ld070wx3.yaml
> @@ -0,0 +1,60 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/panel/lg,ld070wx3.yaml#

Could you make the filename match the compatible please?
With that,
Acked-by: Conor Dooley <conor.dooley@...rochip.com>

Cheers,
Conor.

> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: LG Corporation 7" WXGA TFT LCD panel
> +
> +maintainers:
> +  - Svyatoslav Ryhel <clamor95@...il.com>
> +
> +allOf:
> +  - $ref: panel-common.yaml#
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: lg,ld070wx3-sl01
> +
> +  reg:
> +    maxItems: 1
> +
> +  vdd-supply: true
> +  vcc-supply: true
> +
> +  backlight: true
> +  port: true
> +
> +required:
> +  - compatible
> +  - vdd-supply
> +  - vcc-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    dsi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        panel@0 {
> +            compatible = "lg,ld070wx3-sl01";
> +            reg = <0>;
> +
> +            vdd-supply = <&vdd_3v3_lcd>;
> +            vcc-supply = <&vcc_1v8_lcd>;
> +
> +            backlight = <&backlight>;
> +
> +            port {
> +                endpoint {
> +                    remote-endpoint = <&dsi0_out>;
> +                };
> +            };
> +        };
> +    };
> +...
> diff --git a/Documentation/devicetree/bindings/display/panel/panel-simple-dsi.yaml b/Documentation/devicetree/bindings/display/panel/panel-simple-dsi.yaml
> index 9b92a05791cc..f9f1e76a810c 100644
> --- a/Documentation/devicetree/bindings/display/panel/panel-simple-dsi.yaml
> +++ b/Documentation/devicetree/bindings/display/panel/panel-simple-dsi.yaml
> @@ -42,8 +42,6 @@ properties:
>        - kingdisplay,kd097d04
>          # LG ACX467AKM-7 4.95" 1080×1920 LCD Panel
>        - lg,acx467akm-7
> -        # LG Corporation 7" WXGA TFT LCD panel
> -      - lg,ld070wx3-sl01
>          # LG Corporation 5" HD TFT LCD panel
>        - lg,lh500wx1-sd03
>          # Lincoln LCD197 5" 1080x1920 LCD panel
> -- 
> 2.48.1
> 

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