linux-kernel - Re: [PATCH v2 07/10] dt-bindings: tc358754: add DT bindings

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Date:   Mon, 18 Jun 2018 13:23:54 +0200
From:   Maciej Purski <m.purski@...sung.com>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Inki Dae <inki.dae@...sung.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v2 07/10] dt-bindings: tc358754: add DT bindings



On 05/31/2018 06:02 AM, Rob Herring wrote:
> On Wed, May 30, 2018 at 02:15:58PM +0200, Maciej Purski wrote:
>> From: Andrzej Hajda <a.hajda@...sung.com>
>>
>> The patch adds bindings to Toshiba DSI/LVDS bridge TC358764.
>> Bindings describe power supplies, reset gpio and video interfaces.
>>
>> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
>> Signed-off-by: Maciej Purski <m.purski@...sung.com>
>> ---
>>   .../bindings/display/bridge/toshiba,tc358764.txt   | 37 ++++++++++++++++++++++
>>   1 file changed, 37 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
>>
>> diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
>> new file mode 100644
>> index 0000000..6eda14f
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
>> @@ -0,0 +1,37 @@
>> +TC358764 MIPI-DSI to LVDS panel bridge
>> +
>> +Required properties:
>> +  - compatible: "toshiba,tc358764"
>> +  - reg: the virtual channel number of a DSI peripheral
>> +  - vddc-supply: core voltage supply, 1.2V
>> +  - vddio-supply: I/O voltage supply, 1.8V or 3.3V
>> +  - vddlvds-supply: LVDS1/2 voltage supply, 3.3V
>> +  - reset-gpios: a GPIO spec for the reset pin
>> +
>> +The device node can contain zero to two 'port' child nodes, each with one
> 
> How would 0 ports be valid?
> 

I'll fix this. In my opinion the output LVDS port should be mandatory
and the input DSI port should be optional, as the bridge might be a DSI
child node. According to documentation, the bridge can also be I2C controlled.
In this case, it should contain a DSI input port and LVDS output port.


>> +child 'endpoint' node, according to the bindings defined in [1].
>> +The following are properties specific to those nodes.
>> +
>> +port:
>> +  - reg: (required) can be 0 for DSI port or 1 for LVDS port;
>> +
>> +[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
>> +
>> +Example:
>> +
>> +	bridge@0 {
>> +		reg = <0>;
>> +		compatible = "toshiba,tc358764";
>> +		vddc-supply = <&vcc_1v2_reg>;
>> +		vddio-supply = <&vcc_1v8_reg>;
>> +		vddlvds-supply = <&vcc_3v3_reg>;
>> +		reset-gpios = <&gpd1 6 GPIO_ACTIVE_LOW>;
>> +		#address-cells = <1>;
>> +		#size-cells = <0>;
>> +		port@1 {
>> +			reg = <1>;
>> +			lvds_ep: endpoint {
>> +				remote-endpoint = <&panel_ep>;
>> +			};
>> +		};
>> +	};
>> -- 
>> 2.7.4
>>
> 
> 
>