linux-kernel - Re: [PATCH v3 1/2] dt-bindings: display: bridge: Add bindings for SN65DSI83/84/85

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Date:   Mon, 15 Feb 2021 10:02:56 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Jagan Teki <jagan@...rulasolutions.com>,
        Rob Herring <robh+dt@...nel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-amarula@...rulasolutions.com,
        Marek Vasut <marex@...x.de>
Subject: Re: [PATCH v3 1/2] dt-bindings: display: bridge: Add bindings for
 SN65DSI83/84/85

Hi,

On 14/02/2021 18:44, Jagan Teki wrote:
> SN65DSI83/84/85 devices are MIPI DSI to LVDS based bridge
> controller IC's from Texas Instruments.
> 
> SN65DSI83 - Single Channel DSI to Single-link LVDS bridge
> SN65DSI84 - Single Channel DSI to Dual-link LVDS bridge
> SN65DSI85 - Dual Channel DSI to Dual-link LVDS bridge
> 
> Right now the bridge driver is supporting Channel A with single
> link, so dt-bindings documented according to it.

Shouldn't it describe Dual-link LVDS already for SN65DSI84/85 and Dual Channel DSI for SN65DSI85 even if not implemented in the driver ?

Neil

> 
> Cc: Marek Vasut <marex@...x.de>
> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> ---
> Changes for v3:
> - fixed Rob comments
> - updated commit message and file name to support all chip variants 
> Changes for v2:
> - none
> 
>  .../bindings/display/bridge/ti,sn65dsi8x.yaml | 122 ++++++++++++++++++
>  1 file changed, 122 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/ti,sn65dsi8x.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi8x.yaml b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi8x.yaml
> new file mode 100644
> index 000000000000..7f9f8cd6e786
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi8x.yaml
> @@ -0,0 +1,122 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/ti,sn65dsi8x.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI SN65DSI83/84/85 MIPI DSI to LVDS bridge bindings
> +
> +maintainers:
> +  - Jagan Teki <jagan@...rulasolutions.com>
> +
> +description: |
> +  SN65DSI83/84/85 devices are MIPI DSI to LVDS based bridge controller
> +  IC's from Texas Instruments.
> +
> +  SN65DSI83 - Single Channel DSI to Single-link LVDS bridge
> +  SN65DSI84 - Single Channel DSI to Dual-link LVDS bridge
> +  SN65DSI85 - Dual Channel DSI to Dual-link LVDS bridge
> +
> +  Bridge decodes MIPI DSI 18bpp RGB666 and 240bpp RG888 packets and
> +  converts the formatted video data stream to a FlatLink compatible
> +  LVDS output operating at pixel clocks operating from 25 MHx to
> +  154 MHz.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,sn65dsi83
> +      - ti,sn65dsi84
> +
> +  reg:
> +    const: 0x2c
> +
> +  enable-gpios:
> +    maxItems: 1
> +    description: GPIO specifier for bridge enable pin (active high).
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: |
> +          DSI Input. The remote endpoint phandle should be a
> +          reference to a valid mipi_dsi_host device node.
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: |
> +          Video port for LVDS output (panel or connector).
> +
> +    required:
> +      - port@0
> +      - port@1
> +
> +required:
> +  - compatible
> +  - reg
> +  - enable-gpios
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    dsi {
> +       #address-cells = <1>;
> +       #size-cells = <0>;
> +
> +       ports {
> +           #address-cells = <1>;
> +           #size-cells = <0>;
> +
> +           port@0 {
> +               reg = <0>;
> +               dsi_in: endpoint {
> +                   remote-endpoint = <&ltdc_ep0_out>;
> +               };
> +           };
> +
> +           port@1 {
> +               reg = <1>;
> +               dsi_out: endpoint {
> +                   remote-endpoint = <&bridge_in>;
> +                   data-lanes = <0 1>;
> +               };
> +           };
> +       };
> +    };
> +
> +    i2c6 {
> +       #address-cells = <1>;
> +       #size-cells = <0>;
> +
> +       bridge@2c {
> +           compatible = "ti,sn65dsi84";
> +           reg = <0x2c>;
> +           enable-gpios = <&gpiof 15 GPIO_ACTIVE_HIGH>;
> +
> +           ports {
> +               #address-cells = <1>;
> +               #size-cells = <0>;
> +
> +               port@0 {
> +                   reg = <0>;
> +                   bridge_in: endpoint {
> +                        remote-endpoint = <&dsi_out>;
> +                   };
> +               };
> +
> +               port@1 {
> +                   reg = <1>;
> +                   bridge_out: endpoint {
> +                        remote-endpoint = <&panel_in_lvds>;
> +                   };
> +               };
> +           };
> +       };
> +    };
>