linux-kernel - Re: [PATCH v3 1/2] dt-bindings: bridge: lt8713sx: Add bindings

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Message-ID: <ua6ewpauwabzyf4srnawqz6znsvrzkkl75zwqhpxk4ltdnzvj6@dkntys7skfan>
Date: Sun, 28 Dec 2025 16:20:46 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Vishnu Saini <vishnu.saini@....qualcomm.com>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.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>, Tony <syyang@...tium.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, prahlad.valluru@....qualcomm.com,
        Prahlad Valluru <vvalluru@....qualcomm.com>
Subject: Re: [PATCH v3 1/2] dt-bindings: bridge: lt8713sx: Add bindings

On Sun, Dec 28, 2025 at 05:10:39PM +0530, Vishnu Saini wrote:
> Add bindings for lt8713sx.
> 
> Co-developed-by: Prahlad Valluru <vvalluru@....qualcomm.com>
> Signed-off-by: Prahlad Valluru <vvalluru@....qualcomm.com>
> Signed-off-by: Vishnu Saini <vishnu.saini@....qualcomm.com>
> ---
>  .../bindings/display/bridge/lontium,lt8713sx.yaml  | 101 +++++++++++++++++++++
>  1 file changed, 101 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt8713sx.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt8713sx.yaml
> new file mode 100644
> index 000000000000..0a6dc56e337c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt8713sx.yaml
> @@ -0,0 +1,101 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/lontium,lt8713sx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Lontium LT8713SX Type-C/DP1.4 to Type-C/DP1.4/HDMI2.0/DP++ bridge-hub
> +
> +maintainers:
> +  - Tony <syyang@...tium.com>

Is he/she aware of this?

> +
> +description:
> +  The Lontium LT8713SX is a Type-C/DP1.4 to Type-C/DP1.4/HDMI2.0 converter
> +  that integrates one DP input and up to three configurable output interfaces
> +  (DP1.4 / HDMI2.0 / DP++), with SST/MST functionality and audio support.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - lontium,lt8713sx
> +
> +  reg:
> +    maxItems: 1
> +
> +  vcc-supply:
> +    description: Regulator for 3.3V vcc.
> +
> +  vdd-supply:
> +    description: Regulator for 1.1V vdd.
> +
> +  reset-gpios:
> +    description: GPIO connected to active low RESET pin.
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description:
> +          DP port for DP input from soc to bridge chip
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description:
> +          DP port for DP output from bridge
> +
> +      port@2:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description:
> +          Additional DP port for DP output from bridge

Why do you have only two output ports here? The datasheet documents
three ports.

> +
> +    required:
> +      - port@0
> +
> +required:
> +  - compatible
> +  - reg
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        bridge@4f {
> +            compatible = "lontium,lt8713sx";
> +            reg = <0x4f>;
> +            reset-gpios = <&tlmm 6 GPIO_ACTIVE_LOW>;
> +
> +            ports {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +
> +                port@0 {
> +                    reg = <0>;
> +                    lt8713sx_dp_in: endpoint {
> +                        remote-endpoint = <&mdss_dp0_out>;
> +                    };
> +                };
> +
> +                port@1 {
> +                    reg = <1>;
> +                    lt8713sx_dp0_out: endpoint {
> +                        remote-endpoint = <&dp0_connector_in>;
> +                    };
> +                };
> +
> +                port@2 {
> +                    reg = <2>;
> +                    lt8713sx_dp1_out: endpoint {
> +                        remote-endpoint = <&dp1_connector_in>;
> +                    };
> +                };
> +            };
> +        };
> +    };
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry