linux-kernel - Re: [PATCH v1 1/2] dt-bindings: display: panel: Add Tianma TL121BVMS07-00 panel

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Message-ID: <20251007011649.GA706748-robh@kernel.org>
Date: Mon, 6 Oct 2025 20:16:49 -0500
From: Rob Herring <robh@...nel.org>
To: Langyan Ye <yelangyan@...qin.corp-partner.google.com>
Cc: neil.armstrong@...aro.org, jessica.zhang@....qualcomm.com,
	airlied@...il.com, simona@...ll.ch,
	maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
	tzimmermann@...e.de, krzk+dt@...nel.org, conor+dt@...nel.org,
	dianders@...omium.org, dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dt-bindings: display: panel: Add Tianma
 TL121BVMS07-00 panel

On Tue, Sep 30, 2025 at 03:50:43PM +0800, Langyan Ye wrote:
> Add device tree bindings for the Tianma TL121BVMS07-00 12.1"
> MIPI-DSI TFT LCD panel.
> 
> Signed-off-by: Langyan Ye <yelangyan@...qin.corp-partner.google.com>
> ---
>  .../display/panel/tianma,tl121bvms07-00.yaml  | 85 +++++++++++++++++++
>  1 file changed, 85 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/tianma,tl121bvms07-00.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/tianma,tl121bvms07-00.yaml b/Documentation/devicetree/bindings/display/panel/tianma,tl121bvms07-00.yaml
> new file mode 100644
> index 000000000000..e654b86782e6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/tianma,tl121bvms07-00.yaml
> @@ -0,0 +1,85 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/panel/tianma,tl121bvms07-00.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Tianma TL121BVMS07-00 12.1" MIPI-DSI TFT LCD Panel
> +
> +maintainers:
> +  - Langyan Ye <yelangyan@...qin.corp-partner.google.com>
> +
> +description: |

Don't need '|' if no formatting to preserve.

> +  The Tianma TL121BVMS07-00 is a 12.1-inch MIPI-DSI TFT LCD panel.
> +  It requires multiple regulators (AVDD, AVEE, and 1.8V logic)
> +  and an enable GPIO. Optional properties such as backlight and
> +  rotation are inherited from panel-common.yaml.

Wrap lines at 80 char. The last sentence can be dropped as it says what 
the schema do.

> +
> +allOf:
> +  - $ref: panel-common.yaml#


> +
> +properties:
> +  compatible:
> +    const: tianma,tl121bvms07-00
> +
> +  reg:
> +    description: DSI virtual channel number
> +    minimum: 0
> +    maximum: 3

Just 'reg: true'. dsi-controller.yaml already has these constraints.


> +
> +  enable-gpios:
> +    maxItems: 1
> +    description: GPIO specifier for the enable pin
> +
> +  avdd-supply:
> +    description: phandle of the regulator that provides positive voltage
> +
> +  avee-supply:
> +    description: phandle of the regulator that provides negative voltage
> +
> +  pp1800-supply:
> +    description: core voltage supply
> +
> +  backlight:
> +    $ref: /schemas/types.yaml#/definitions/phandle

Already has a type in panel-common.yaml. Drop.

> +    description: Phandle to the backlight device.
> +
> +  port:
> +    $ref: /schemas/graph.yaml#/properties/port
> +    description: Input port of the panel, connected to the DSI host.

Already in panel-common.yaml.

Either just 'true' for both of these or drop and use 
'unevaluatedProperties' instead of 'additionalProperties'.

> +
> +required:
> +  - compatible
> +  - reg
> +  - enable-gpios
> +  - avdd-supply
> +  - avee-supply
> +  - pp1800-supply
> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    dsi0 {

dsi {

> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      mipi_panel: panel@0 {

drop unused labels.

> +        compatible = "tianma,tl121bvms07-00";
> +        reg = <0>;
> +        enable-gpios = <&pio 25 0>;
> +        avdd-supply = <&en_pp5800_mipi_disp>;
> +        avee-supply = <&en_pp5800_mipi_disp>;
> +        pp1800-supply = <&mt6359_vcn18_ldo_reg>;
> +        backlight = <&backlight>;
> +
> +        port {
> +          panel_in: endpoint {
> +            remote-endpoint = <&dsi_out>;
> +          };
> +        };
> +      };
> +    };
> +
> +...
> -- 
> 2.34.1
>