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Subject: Re: [PATCH 1/2] dt-binding: Add DSI/LVDS tc358775 bridge bindings
To:     Vinay Simha BN <simhavcs@gmail.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc:     "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>, David Airlie <airlied@linux.ie>,
        open list <linux-kernel@vger.kernel.org>,
        "open list:DRM DRIVERS" <dri-devel@lists.freedesktop.org>,
        Rob Herring <robh+dt@kernel.org>
From:   Andrzej Hajda <a.hajda@samsung.com>
Message-ID: <a721cdd3-72e7-a1ef-6b45-d4dcc2787de6@samsung.com>
Date:   Thu, 12 Mar 2020 11:34:59 +0100
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        <1583920112-2680-1-git-send-email-simhavcs@gmail.com>
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Hi Vinay,

Next time add patch version to de subject of email.


On 11.03.2020 10:48, Vinay Simha BN wrote:
> Add yaml documentation for DSI/LVDS tc358775 bridge
>
> Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
>
> ---
> v1:
>  Initial version
> ---
>  .../bindings/display/bridge/toshiba-tc358775.yaml  | 174 +++++++++++++++++++++
>  1 file changed, 174 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba-tc358775.yaml
>
> diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba-tc358775.yaml b/Documentation/devicetree/bindings/display/bridge/toshiba-tc358775.yaml
> new file mode 100644
> index 0000000..e9a9544
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/toshiba-tc358775.yaml
> @@ -0,0 +1,174 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: https://protect2.fireeye.com/url?k=cc9be7f9-9155e4b4-cc9a6cb6-000babff24ad-2a6ce73e1e41d358&u=http://devicetree.org/schemas/display/bridge/toshiba-tc358775.yaml#
> +$schema: https://protect2.fireeye.com/url?k=293d6151-74f3621c-293cea1e-000babff24ad-793c0a803cb80d71&u=http://devicetree.org/meta-schemas/core.yaml#
> +
> +
> +title: Toshiba TC358775 DSI to LVDS bridge bindings
> +
> +maintainers:
> +	- Vinay Simha BN <simhavcs@gmail.com>
> +
> +description: |
> +	This binding supports DSI to LVDS bridge TC358775
> +
> +properties:
> + compatible:
> +	const: toshiba,tc358775
> +
> + reg:
> +   maxItems: 1
> +   description: i2c address of the bridge, 0x0f
> +
> + tc, dsi-lanes: 1
> +   maxItems: 1
> +   description: Number of DSI data lanes connected to the DSI host. It should
> +  be one of 1, 2, 3 or 4.
> +
> + tc, dual-link: 1
> +   maxItems: 1
> +   description: To configure the LVDS transmitter either as single-link or dual-link.


As Laurent commented earlier, it would be better to use two ports. See
for example for input LVDS ports in:

Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt

Both should be defined in bindings but the 2nd can be optional in dts.


Regards

Andrzej


> +
> + vdd-supply:
> +   maxItems: 1
> +   description:  1.2V LVDS Power Supply
> +
> + vddio-supply:
> +   maxItems: 1
> +   description: 1.8V IO Power Supply
> +
> + stby-gpios:
> +   maxItems: 1
> +   description: Standby pin, Low active
> +
> + reset-gpios:
> +   maxItems: 1
> +   description: Hardware reset, Low active
> +
> + ports:
> +   type: object
> +
> +    properties:
> +      port@0:
> +        type: object
> +        description: |
> +          DSI Input. The remote endpoint phandle should be a
> +	  reference to a valid mipi_dsi_host device node.
> +      port@1:
> +        type: object
> +        description: |
> +          Video port for LVDS output (panel or connector).
> +
> +      required:
> +      - port@0
> +      - port@1
> +
> +required:
> + - compatible
> + - reg
> + - dsi-lanes
> + - vdd-supply
> + - vddio-supply
> + - stby-gpios
> + - reset-gpios
> + - ports
> +
> +examples:
> + - |
> +   i2c@78b8000 {
> +	/* On High speed expansion */
> +	label = "HS-I2C2";
> +	status = "okay";
> +
> +	tc_bridge: bridge@f {
> +		status = "okay";
> +
> +		compatible = "toshiba,tc358775";
> +		reg = <0x0f>;
> +
> +		tc,dsi-lanes = <4>;
> +		tc,dual-link = <0>;
> +
> +		vdd-supply = <&pm8916_l2>;
> +		vddio-supply = <&pm8916_l6>;
> +
> +		stby-gpio = <&msmgpio 99 GPIO_ACTIVE_LOW>;
> +		reset-gpio = <&msmgpio 72 GPIO_ACTIVE_LOW>;
> +
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			port@0 {
> +				reg = <0>;
> +				d2l_in: endpoint {
> +					remote-endpoint = <&dsi0_out>;
> +				};
> +			};
> +
> +			port@1 {
> +				reg = <1>;
> +				d2l_out: endpoint {
> +					remote-endpoint = <&panel_in>;
> +				};
> +			};
> +		};
> +	};
> +  };
> +
> +  panel: auo,b101xtn01 {
> +		status = "okay";
> +		compatible = "auo,b101xtn01", "panel-lvds";
> +		power-supply = <&pm8916_l14>;
> +
> +		width-mm = <223>;
> +		height-mm = <125>;
> +
> +		data-mapping = "jeida-24";
> +
> +		panel-timing {
> +			/* 1366x768 @60Hz */
> +			clock-frequency = <72000000>;
> +			hactive = <1366>;
> +			vactive = <768>;
> +			hsync-len = <70>;
> +			hfront-porch = <20>;
> +			hback-porch = <0>;
> +			vsync-len = <42>;
> +			vfront-porch = <14>;
> +			vback-porch = <0>;
> +		};
> +
> +		port {
> +			panel_in: endpoint {
> +				remote-endpoint = <&d2l_out>;
> +			};
> +		};
> + };
> +
> +  mdss@1a00000 {
> +	status = "okay";
> +
> +	mdp@1a01000 {
> +		status = "okay";
> +	};
> +
> +	dsi@1a98000 {
> +		status = "okay";
> +		..
> +		ports {
> +			port@1 {
> +				dsi0_out: endpoint {
> +					remote-endpoint = <&d2l_in>;
> +					data-lanes = <0 1 2 3>;
> +				};
> +			};
> +		};
> +	};
> +
> +	dsi-phy@1a98300 {
> +		status = "okay";
> +		..
> +	};
> + };