linux-kernel - Re: [PATCH v2 2/4] arm64: dts: qcom: sm8750-mtp: Enable display

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Message-ID: <e301edf2-4769-4f1f-a452-ef4410abf16c@kernel.org>
Date: Tue, 16 Dec 2025 17:31:37 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Jessica Zhang <jesszhan@...cinc.com>,
 Abhinav Kumar <abhinavk@...cinc.com>, Abel Vesa <abel.vesa@...aro.org>,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] arm64: dts: qcom: sm8750-mtp: Enable display

On 13/11/2025 04:50, Dmitry Baryshkov wrote:
> On Wed, Nov 12, 2025 at 04:02:39PM +0100, Krzysztof Kozlowski wrote:
>> Enable display on MTP8750 board with Novatek NT37801 panel.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>> ---
>>  arch/arm64/boot/dts/qcom/sm8750-mtp.dts | 70 +++++++++++++++++++++++++++++++++
>>  1 file changed, 70 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
>> index c8cb521b4c26..68644eccdbff 100644
>> --- a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
>> +++ b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
>> @@ -933,6 +933,48 @@ &lpass_vamacro {
>>  	qcom,dmic-sample-rate = <4800000>;
>>  };
>>  
>> +&mdss {
>> +	status = "okay";
>> +};
>> +
>> +&mdss_dsi0 {
>> +	vdda-supply = <&vreg_l3g_1p2>;
>> +
>> +	status = "okay";
>> +
>> +	panel@0 {
>> +		compatible = "novatek,nt37801";
>> +		reg = <0>;
>> +
>> +		reset-gpios = <&tlmm 98 GPIO_ACTIVE_LOW>;
>> +
>> +		vddio-supply = <&vreg_l12b_1p8>;
>> +		vci-supply = <&vreg_l13b_3p0>;
>> +		vdd-supply = <&vreg_l11b_1p0>;
>> +
>> +		pinctrl-0 = <&disp0_reset_n_active>, <&mdp_vsync_active>;
>> +		pinctrl-1 = <&disp0_reset_n_suspend>, <&mdp_vsync_suspend>;
> 
> Nit: Is the VSYNC pin a pinctrl for the panel? I think it's a pin used
> by DSI controller or by the DPU.

On the schematics it goes to the panel, so I think it might be treated
as panel's property. It's also made like this on every other DTS,
although I know that this is not the best argument.

> 
> Other than that:
> 
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>

Best regards,
Krzysztof