linux-kernel - Re: [PATCH v3 3/3] arm64: dts: qcom: sm8550-mtp: add DSI panel

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Date:   Wed, 18 Jan 2023 15:04:15 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] arm64: dts: qcom: sm8550-mtp: add DSI panel

On 18/01/2023 14:36, Konrad Dybcio wrote:
> 
> 
> On 18.01.2023 09:55, Neil Armstrong wrote:
>> Add nodes for the Visionox VTDR6130 found on the SM8550-MTP
>> device.
>>
>> TLMM states are also added for the Panel reset GPIO and
>> Tearing Effect signal for when the panel is running in
>> DSI Command mode.
>>
>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>> ---
>>   arch/arm64/boot/dts/qcom/sm8550-mtp.dts | 56 +++++++++++++++++++++++++++++++++
>>   1 file changed, 56 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sm8550-mtp.dts b/arch/arm64/boot/dts/qcom/sm8550-mtp.dts
>> index 0dfd1d3db86c..2de387aa2c2d 100644
>> --- a/arch/arm64/boot/dts/qcom/sm8550-mtp.dts
>> +++ b/arch/arm64/boot/dts/qcom/sm8550-mtp.dts
>> @@ -370,6 +370,34 @@ &mdss {
>>   &mdss_dsi0 {
>>   	vdda-supply = <&vreg_l3e_1p2>;
>>   	status = "okay";
>> +
>> +	panel@0 {
>> +		compatible = "visionox,vtdr6130";
>> +		reg = <0>;
>> +
>> +		pinctrl-names = "default", "sleep";
>> +		pinctrl-0 = <&sde_dsi_active>, <&sde_te_active>;
>> +		pinctrl-1 = <&sde_dsi_suspend>, <&sde_te_suspend>;
> Hm.. I've just realized there are two styles of specifying
> phandle arrays: <&a &b> and <&a>, <&b>.. even worse, we
> have both of them in our tree.. Krzysztof, Bjorn, which one
> should we go with, going forward?

I've been cleaning into <&a>, <&b> for the last few years and
it clearer since it separates each phandle (+ parameters) in the DTS.

Neil

> 
> 
>> +
>> +		vddio-supply = <&vreg_l12b_1p8>;
>> +		vci-supply = <&vreg_l13b_3p0>;
>> +		vdd-supply = <&vreg_l11b_1p2>;
>> +
>> +		reset-gpios = <&tlmm 133 GPIO_ACTIVE_LOW>;
>> +
>> +		status = "okay";
> Superfluous, it's enabled by default, drop

Ack, will remove

> 
> Konrad
>> +
>> +		port {
>> +			panel0_in: endpoint {
>> +				remote-endpoint = <&mdss_dsi0_out>;
>> +			};
>> +		};
>> +	};
>> +};
>> +
>> +&mdss_dsi0_out {
>> +	remote-endpoint = <&panel0_in>;
>> +	data-lanes = <0 1 2 3>;
>>   };
>>   
>>   &mdss_dsi0_phy {
>> @@ -415,6 +443,34 @@ &sleep_clk {
>>   
>>   &tlmm {
>>   	gpio-reserved-ranges = <32 8>;
>> +
>> +	sde_dsi_active: sde-dsi-active-state {
>> +		pins = "gpio133";
>> +		function = "gpio";
>> +		drive-strength = <8>;
>> +		bias-disable;
>> +	};
>> +
>> +	sde_dsi_suspend: sde-dsi-suspend-state {
>> +		pins = "gpio133";
>> +		function = "gpio";
>> +		drive-strength = <2>;
>> +		bias-pull-down;
>> +	};
>> +
>> +	sde_te_active: sde-te-active-state {
>> +		pins = "gpio86";
>> +		function = "mdp_vsync";
>> +		drive-strength = <2>;
>> +		bias-pull-down;
>> +	};
>> +
>> +	sde_te_suspend: sde-te-suspend-state {
>> +		pins = "gpio86";
>> +		function = "mdp_vsync";
>> +		drive-strength = <2>;
>> +		bias-pull-down;
>> +	};
>>   };
>>   
>>   &uart7 {
>>